Home

Direct View/Projection Television Troubleshooting

1. 51 Horizontal Drive Circuit ssssss 51 DA 4 Vertical Deflection Circuit 53 DA 4X Horizontal Deflection Circuit 54 DA 4X Vertical Deflectin Circuit 55 7 DA 4 amp DA 4X Chassis Communication Bus Networks 56 DA 4 amp DA 4X Data Communication DIAS sa nico d teta ster at nti Mee amd 56 8 DA 4 amp DA 4X Audio Circuits 58 DA 4 amp DA 4X Audio Block Diagram 58 Chapter 1 Introduction and DA 4 amp DA 4X PCB Interconnection Introduction Overview The C31P15 course covers the DA 4 Direct View and the DA 4X Projection chassis The content includes new features such as Memory Stick and DVI Also included is theory of operation and troubleshooting tips for all major circuits Power Supplies Protection Deflection Communications and Audio inthe DA 4 and DA X chassis This training manual is based on the KV 32HV600 model Objectives e New Features e Circuit Theory of Operation e Component and Board level troubleshooting DA 4 amp DA AX PCB Interconnection Overview The DA 4 Direct View and DA 4X Projection chassis share many of the same PCBs The only differences are found in the RGB Drive Power Supply and Flash Focus circuits Table 1 1 indicates the circuits found on each PCB and if the PCB is board or component level repairable for both the DA 4 and DA 4X chassis T
2. 34 In vertical shut down mode only the video is muted the AC power and Audio remain ON and the Stby Timer LED flashes a 4X sequence DA 4 Regulated 5V and White Balance Protection Circuit IC2300 SYSCON 4 e gn REG 5V R2375 PROTECTION Q2314 IC2801 CRT DRIVE IK IN 1C9001 1C9002 IC9003 RED GREEN BLUE WHITE BALANCE PROTECTION NOTE IK OUT ON HS MODELS IS IC9001 9002 9003 PIN 5 FIGURE 4 5 DA 4 REG 5V AND WHITE BALANCE PROTECTION CIRCUITS P 848 102802 Regulated 5V Protection Circuit Reference Figure 4 5 The regulated 5V line is monitored using Q2314 and Zener diode D2310 3 6V on the M board The output of the 5V regulator IC504 is applied to the emitter of Q2314 In normal operation Q2314 is turned ON and D2310 is conducting holding the base at 3 6V Approximately 2 8V is applied to System Control IC2300 pin 43 indicating proper level of the regulated 5V line If the 5V line falls below approximately 4 5V at the emitter of Q2314 D2310 will stop conducting Q2314 will turn OFF and a Low will be applied to IC2300 pin 43 IC2300 pin 69 will then turn OFF the AC relay The AC relay shuts down and the Stby Timer LED flashes a 6X sequence 35 White Balance Protection Circuit IK Protection Reference Figure 4 5 The condition of each CRT cathode RGB must be monitored in order to m
3. 6 5 IK 1C9201 VIDEOOUT REF D8043 A A D8025 TO HVOVP BEAM T8003 PIN 1 HORIZONTAL IC8006 CURRENT HOT B SWITCH PIN PROTECT Q2028 HV PROT IC8005 HV DRIVE H PROTECTION D BOARD IK PROTECTION FIGURE 4 8 HORIZONTAL VERTICAL IK AND HV PROTECTION CIRCUIT C31P15 4 8 1522 Horizontal Deflection Protection Circuit Reference Figure 4 8 The horizontal pulse output at IC8005 pin 3 drives the 135V regulator transistor Q8027 which drives T8003 pin 1 HOT A sample of the horizontal pulse is taken from the terminal of Q8027 which is applied to buffer IC8005 pin 12 and then to the base of Q8044 As long as the horizontal pulse is present at the base of Q8044 a low is present at the collector lfthe horizontal deflection should stop the signal at the base of Q8044 will stop and a High will be produced at the collector of Q8044 which will forward bias D8052 A High will now be applied to IC2801 pin 57 to blank the video and IC2801 pin 52 will communicate with IC2300 pin 31 and shut off the AC relay The standby timer LED will flash a 7X sequence 41 HV Protection Reference Figure 4 8 Also attached to the H Prot input IC2801 pin 57 is the HV PROT This circuit is actually monitoring two functions HV OVP and Beam Current through D8043 and D8025 respectively If an excessive HV or Beam current condition should occur IC8006 pin 5 will go High which will cause IC8006 pin 7 to output a
4. The AC is rectified filtered and a DC voltage of 18V is applied to 1C6701 pin 8 Once the 24V is stable 1C6701 s internal control circuit disconnects internally the power source at IC6701 pin 18 All IC6701 internal circuits are now powered from 1C6701 pin 8 Over Current Protection OCP ref Figure 3 7 The current flowing through the switching FETS Q6701 and Q6702 also passes through T6703 pins 1 and 2 C6711 and resistor bank R6728 and R6729 The voltage drop across resistor bank R6728 and R6729 is directly proportional to the current through the switching FETS The voltage drop across R6557 and R6556 is further voltage divided by R6731 and R6730 and applied to IC6701 pin 9 The OCP is activated when the voltage at IC6701 pin 9 exceeds 0 2V The self diagnostic indicator will flash four times pause and then repeat Over Voltage Protection OVP and Under Voltage Protection UVP The voltage at IC6701 pin 8 VC1 is monitored by circuitry inside C6701 for Under voltage and Over voltage conditions The two conditions are as follows OVP greater then 33V 24 UVP less then 8V If either of these two conditions occurs at IC6501 pin 8 the unit will go into protection mode The self diagnostic indicator will flash four time times pause and then repeat Troubleshooting Tips ref Figure 3 3 NOTE Follow previously discussed IC6701 Startup Sequence The five steps are in order of occurrence NOTE Use HOT GRND when making m
5. To keep the current below 117mA resistor R6705 Inrush Current Resistor is in series with the AC input during the initial power up of the TV After the initial power up current surge R705 is bypassed when RY6702 Inrush Relay is energized and the switch is closed The operation of RY6702 is monitored using R6705 and PH6002 If RY6702 does not function a voltage drop will develop across R6705 which in turn develops a voltage across R6715 The voltage across R6715 turns on the LED and 11V is output on PH6002 pin 3 D6523 is now forward biased and a High is applied to the base of Q6504 turning it ON which then applies a Low to the base Q6502 turning it ON Q6504 and Q6502 is a latching circuit 39 Once the latch is activated the voltage at the base of Q6503 is reduced and it turns OFF removing the ground path for the AC Relay and it turns OFF The TV shuts down and the Stby Timer LED flashes a 7X sequence 15 OVP Reference Figure 4 7 The circuit monitoring the condition of the 15V line is a simple 20V zener diode If the 15V line increases above 20 6V the Latch will be activated and the AC relay will be shut OFF B OCP Reference Figure 4 7 The current is monitored in the 135V line using resistor R6506 located in the ground side of the 135V circuit If the current increases in the 135V line the current through R6506 will also increase but because of the direction of the current through R6506 a negative voltage is developed an
6. rectifier circuit The resulting DC voltage 11V is applied to the input pin of IC501 5V regulator which then supplies regulated 5V to the following components e C2300 System Control M board e 102302 NVM M board e 102305 3 3V Regulator M board e Q2312 Remote Input Buffer e HA HC boards Key Input LED and Remote Sensor 14 Power ON Switching Circuit Reference Figure 3 2 during the following circuit description In the Standby mode System Control IC2300 is partially powered using STBY SV and waiting for an ON command from either the Front Panel Controls IC2300 pins 93 and 94 or the Remote Control IC2300 pin 7 Once the ON command is received IC2300 pin 69 AC RLY outputs a high which is applied to the base of Q6527 turning Q6527 ON This completes the ground path for the AC Relay RY6501 and for the base circuit of Q503 Q503 turns on and supplies the initial kick voltage and current through D508 to RY6501 closing the relay switch and supplying AC power to the Main Power Supply through Inrush resistor R6516 and D6530 Once C513 in the base circuit charges completely Q503 turns off D508 reverse biases and D509 forward biases supplying a hold voltage 9V to keep the relay switch closed in the ON mode At this point the Main Power supply is turning ON operation will be discussed next The initial AC power to the Main Power Supply is through Inrush resistor R6516 which limits the high surge current that occurs
7. 5 1 The DA 4 and DA 4X chassis s video processing circuits can be evaluated to board level simple by using the various inputs The following is a list of inputs versus the circuits active for that particular input Video Inputs 1 4 480i Input 1C1502 AV switch U board 1C2001 and IC2200 Comb M board IC2005 and IC2004 YCT M board IC2008 M board DRC circuit B board MID circuit B board IC2801 CRT Drive B board 49 Video Inputs 5 and 6 1080i Input IC1505 Video Switch U borad IC2006 Component I F M board MID circuit B board IC2801 CRT Drive B board Note 480i will add the DRC circuit before the MID circuit DVI Input IC1505 Video Switch M board MID circuit IC2801 CRT Drive B board Memory Stick Input MID circuit B board IC2801 CRT Drive B board Note that by applying signals to the various inputs complete circuits and boards can be bypassed to determine on which board the defective circuit is located This is the most efficient way to troubleshoot the video processing circuits because the M and B boards are not field repairable EXAMPLES Reference Figure 5 1 1 The Memory Stick Input will bypass the U and M boards 2 The DVI Input will bypass the U board 3 The Video 1 4 and Video 5 6 inputs can be used to isolate a defect to either IC1502 or IC1505 50 Chapter 6 DA 4 amp DA 4X Chassis Deflection Circuits DA 4 Horizontal Deflection Circuit 9V 152Vp p asss 40 SEE a o
8. DA 4 amp DA 4X DA 4X chassis ONLY All models and both DA 4 and DA 4X chassis Same Part for both DA 4 amp DA 4X All models and both DA 4 and DA 4X chassis Same Part for both DA 4 amp DA 4X DA 4X chassis ONLY DA 4 chassis ONLY Figure 1 1 illustrates the PCB interconnections for both the DA 4 and DA 4X chassis DVI MOLEX ANTENNA HA HC XBR By AG a KEYS CONVERTER INPUT KV40XBR 800 ONLY SIRCS D SS LED i AC DC POWER CORRE TION AUDIO POWER MAN MICRO ur TUNER ZA 3D COMB DY CONV DA 4 VIDEO PROCESSOR AUDIO PROCESSOR DA 4X CCD V CHIP ID1 V PIN COIL STICK PROCESSOR CHASSIS i N S COIL ae COIL AN INPUTS cn PUT AN POWER AD DRC MONITOR 2 CUT SWITCH SUPPLY NUM MID XA S CONTROL I v PIN D 23 a DA 4X N S DRIVE AD DNR VIDEO CHASSI OUT MEMORY STICK CH fos MEMORY VIDEO E DA 4X STICK CHASSIS OUT oe es Al e H V DRIVE a L T e H V DY DIGITA e POWER SUPPLY REG AC RECT e PJED CPU FLASH FOCUS DEFLECTION PJE DRIVE SENSORS HORIZONTAL amp VERTICAL DEFLECTION YOKE FIGURE 1 1 DA 4 amp DA 4X PCB BLOCK INTERCONNECTION DIAGRAM 1031P151478 1702 Chapter 2 New Features DA 4 amp DA 4X Chassis Three new features will be discussed in this section e Scrolling Index e DVI Interface e Memory Stick Interface Scrolling Index The Scrolling Index
9. High The High will forward bias D8051 and a High will now be applied to IC2801 pin 57 to blank the video IC2801 pin 52 will then communicate with IC2300 pin 31 and shut off the AC relay The standby timer LED will flash a 7X sequence Vertical Deflection Protection Circuit Reference Figure 4 8 IC2801 pin 56 monitors the low side of the vertical deflection coil V DY IC8003 pin 5 drives the high side of the V DY while the other side goes to ground through R8036 A small vertical feedback signal is developed across R8036 which is applied to IC2801 pin 56 If the vertical deflection circuit should fail no drive to V DY IC2801 pin 56 will detect the missing vertical feedback signal and blank the video output to the CRT The TV will be placed in Vertical shutdown and the standby timer LED will flash a 4X sequence The AC Power and Audio will remain ON IK White Balance Protection Circuit Reference Figure 4 8 Each CRT driver IC9101 9201 and 9301 pin 7 located on the CR CG and CB boards produces an IK feedback pulse directly proportional to the current in each cathode which indicates the condition of the cathode All three IK feedback pulses are combined at Q9104 on the CR board and sent back sequentially to IC2801 pin 24 Each pulse is monitored for level by IC2801 pin 24 If a pulse is low IC2801 pin 52 will detect a weakened cathode and IC2801 will increase the drive signal to that weakened cathode until optimal white balanc
10. RX1 RX2 RX2 and one reference clock differential channel RXC RXC IC7001 NVM is also connected to the external device through the SDA and SCL I2C bus 1C7001 stores the EDID data Extended Display Identification Data and HDCP High Definition Digital Content Protection EDID is sent to inform the external digital device of the TV s identity and capabilities HDCP is an Authentication protocol between the external digital device transmitter and the TV receiver that affirms to the transmitter that the receiver is authorized to receive the protected information CN 7001 pin 14 5V is supplied from the external digital device to power IC7001 NVM so EDID can be sent when the TV set is OFF If the TV set is ON 1C7001 will receiver 5V from CN7002 through D7001 CN7001 pin 16 is the Hot Plug Detect pin HPD The TV set supplies 5V to the external digital device to verify proper connection between the two devices ize a ENE ET Ea Ea EN Fa Ps Seal eh el ale ahaa CONNECTOR CN7001 Rx 2 R x 24P MOLEX Rx 1 Rx 0 R x C SDA HPD 1 0 RxC SCL V 1C7001 NAM 3 3V REG 5V REG Rx 2 I CN2304 PIN 1 R7021 10kHz 3 3V 2 5V 5V 1C7004 DVI DECODER X7001 14 31818MHz SDA SUE 1C7006 NVM 5V FIGURE 2 2 UD BOARD BLOCK DVI DECODER C31P15 2 2 1501 10 31 02 The DVI Decoder 1C7004 receives the three channels of digital video dat
11. S B SUB p IC1505 V Y C IC1502 R VIDEO TUNER TUNER eee CV Y C CVYC CV OO 2 669 OG XS PER ARE RE CN1501 Q1506 VIDEO 1 vipeoa r ESN ogi VIDEO 4 VIDEO5 vIDEO6 TESTE J1504 J1509 J1508 J150 i wnptoe MONITOR i J 100 i OOO 22 zz J1503 FIGURE 5 1 DA 4 amp DA 4X VIDEO PROCESSING BLOCK 45 C31P15 5 1 10 15 02 Video Processing Circuit Description Reference Figure 5 1 The Main and Sub Tuners are located on the A board The video path is through the M board for each tuner starting at the A board CN525 pins 39 and 49 which connects to the B board CN2302 pin 39 and 49 CN2006 pins A9 amp B7 B board then connects to CN1502 pins A9 and B7 U board The video is then input to IC1502 pin 63 Main and 1C1502 pin 60 Sub the AV Switcher Waveform 5 1 Sub and Main Tuner Video Output The Sub video input is selected by 171502 and the Main video is selected by either IC1502 or 11505 Once the inputs are selected the Sub video is output at IC1502 pins 56 V Y and 58 C and Main video is output at IC1502 pins 44 V Y and 47 C or IC1505 pins 3 5 and 6 Component Video inputs 1 3 and 4 are all located on the U board and are connected directly to IC1502 as shown in Figure 5 1 Video input 2 is located on the HB board on the front of the TV and is also connected directly to IC 1502 Video inputs 1 2 3 and 4 can accommodate either Composite video or S Video The Sub and Mai
12. allows you to select your main video from a scrolling index of video pictures The Scrolling Index appears with the currently selected program in the main left window and four scrolling video pictures in windows down the right side of the picture tube As each picture on the right scrolls to the live preview window it changes briefly from a frozen video to live video The right side continues to scroll through the entire channel list Factors Affecting the Scrolling Index gt Scrolling Index does not function if you use a cable box to view all channels gt Sources connected to the AUX Figure 2 1 Video 5 Video 6 and Video 7 inputs Scrolling Index are visible in the left window but not in the scrolling right windows gt Scrolling Index does not function if the parental controls are set Digital Visual Interface DVI Introduction As the digital display technology e g Plasma and LCD grows so does the need to replace the present analog HD component connection between external digital device e g Digital TV Satellite Receiver and the HDTV set The issue is the inherent picture quality problems caused by Digital to Analog D A and Analog to Digital A D conversion processes For example if you have a digital Plasma display HDTV and a Digital TV Satellite Receiver the digital video signal in the Digital TV Satellite Receiver must be converted to a analog component video signal and then sent to the HDTV
13. are backup FBT OCP protection circuits protecting against excessive beam current in the CRT IC8006 uses Q8021 switch to stop H drive at the emitter of Q8041 IC8006 pin 3 protects against excessive HV the same as IC8007 pin 3 The difference between the two circuits is where the HV is monitored 1C8007 pin 3 monitors HV at the HV Block whereas IC8006 pin 3 monitors the HV using a coil in the primary side of the FBT located at FBT pins 5 and 6 The output at FBT pin 6 is directly proportional to the HV If HV increases so will FBT pin 6 The output is rectified filtered and applied to IC8006 pin 3 The function after a High is applied to IC8006 pin 3 is identical to I1C8007 pin 3 described above except Q8021 is used to stop the H drive at the emitter of Q8041 The Standby Timer LED flashes a 7X sequence when a failure occurs Regulated 5V Protection Circuit SYSCON 1C2300 I LB ERR a FIGURE 4 10 REGULATED SV PROTECTION CIRCUIT cseisaso 1171202 Reference Figure 4 10 The regulated 5V line is monitored using Q2314 and Zener diode D2310 3 6V on the M board The output of the 5V regulator IC504 is applied to the emitter of Q2314 In normal operation Q2314 is turned ON and D2310 is conducting holding the base at 3 6V Approximately 2 8V is applied to System Control IC2300 pin 43 indicating proper level of the regulated 5V line If the 5V line falls below approximately 4
14. at the top of R8035 and less current will flow through R8035 The voltage drop across R8035 will decrease causing the combined voltage drop across R8036 and R8035 to decrease At the same time the 0 6V at the base of Q8007 is decreasing which turns OFF Q8007 and a High will be developed at the collector through pull up resistor R8022 D8007 is now forward biased through pull up resistor R8024 and a High is applied to IC2801 pin 57 1C2801 will mute the video and communicate via IC2801 pin 52 with IC2300 pin 31 to shut off the AC relay at IC2300 pin 69 The TV video is muted the AC relay shuts down and the Stby Timer LED flashes a 7X sequence Vertical Deflection Protection Circuit Reference Figure 4 4 The operation of the vertical deflection circuit is monitored using the feedback pulse developed at IC5004 pin 3 vertical drive IC The pulse is amplitude limited using D5001 4 7V Zener diode The pulse passes through buffer Q5005 and is applied to the base of Q5009 turning it ON while applying a Low to the base of Q5010 turning it OFF With Q5010 OFF the V DY feedback will be applied to IC2801 pin 56 indicating proper vertical deflection operation If the Vertical deflection should cease due to a defect the feedback pulse at IC5004 pin 3 will not be developed no pulse through Q5005 buffer Q5009 will turn OFF and Q5010 will turn ON The V DY will go to ground IC2801 pin 56 detects the missing V DY and places the TV in vertical shut down
15. momentarily at turn ON Once the secondary voltage UNREG 11V is developed on T6502 in the Main Power Supply it is fed back to the Inrush Relay RY6502 RY6502 turns on and bypasses R6516 in the ON mode R6516 is only in the circuit during initial power up of the set Troubleshooting Tip Obviously if a failure occurs in the 5V Standby Power Supply the unit will not even attempt to turn ON If this condition occurs check the following components 1 FH501 13V at IC501 Input Pin I If missing suspect T502 D503 and or C507 3 5V at IC501 Output Pin O If missing suspect a defective IC501 NOTE Q503 is used as a current source for the AC relay RY6501 If the collector emitter junction of Q503 becomes an Open circuit the set will still turn ON using voltage through D509 and function properly with sufficient AC power input If the AC power input is weak Low Voltage 90VAC the unit will have difficulty turning ON without Q503 functioning properly 15 DA 4 Main Switching Power Supply Circuit So a cm SU D6519 R6508 KI icis D6520 R6510 TR J CIRCUIT OPERATION ene T 06549 ee ER IS THE SAME FOR L BOTH DA4 amp DA4X CHASSIS TO A BD A BOARD CN6701 1 LA BOARD AUDIO VCC CN514 D6530 AC RECT TO IC8002 PIN 1 SB HV POWER SUPPLY fy WWwWvo 0 V R6526 R6646 FILTER CIRCUIT R6514 I IC6501 i R6517 Mcz VS 279Vp p L 3001D Q6506 H 78kHz O P R6557 C6352 D650
16. where it must be converted back to a digital signal video to drive the Plasma display Because of the two video signals conversion steps and the possible analog signal loss across the connection between the HDTV and the Digital TV Satellite Receiver the picture quality will suffer Even with an analog CRT the Digital TV Satellite Receiver video signal must go through D A conversion which can adversely affect picture quality The resolution to this dilemma is the creation of a complete end to end standard digital video interface such as DVI The DVI interface is a high speed digital video interface allowing uncompressed high definition content to be passed to another DVI equipped device such as an HDTV set DVI is the only digital interface capable of accommodating uncompressed digital data such as HD video DVI also has the bandwidth to support higher audio fidelity DVI has a bandwidth of up to 5 Gigabits sec which is more then enough to accommodate an uncompressed HD video transmission that typically requires 2 2 Gigabits sec bandwidth DVI Connector and Decoding Block The DVI Molex connector and Decoding circuitry for both the DA 4 and DA 4X chassis are located on the UD Board NOTE This board is NOT field repairable Figure 2 2 shows a block diagram for the UD Board The DVI signal from a Digital TV Satellite Receiver is received at the 24 pin Molex connector CN7001 There are three serial data differential channels RX0 RX0 RX1
17. 004 and resistor network RV8002 R8017 R8014 and R8015 are part of the HV regulator circuit A sample of the HV is output at FBT pin 13 and is applied to IC8004 pin 5 Buffer Approximately 7 4V is produced at IC8004 pin 7 which is then applied to the resistor network Approximately 2 5V is developed at the junction of R8014 R8015 and R8017 R8014 is the feedback path for IC8002 HV Power Supply Converter IC to keep the HV regulated R8025 is the path for the Low HV detection circuit When the 2 5V at IC8006 pin2 decreases below the reference voltage 2 2V at IC8006 pin3 a High will be output at IC8006 pin 1 approximately 14V through pull up resistor R8032 Zener diode D8028 5 1V will break down D5007 is now forward biased and a High is applied to the base of Q6532 turning it ON which then applies a Low to the base Q6530 turning it ON activating the latch Once the latch is activated the voltage at the base of Q6527 is reduced and it turns OFF removing the ground path for the AC Relay and it turns OFF The TV shuts down and the Stby Timer LED flashes a 6X sequence FBT Over Current Protection IK Prot 2 Reference Figure 4 2 The secondary current in FBT is monitored by Q8007 at FBT pin 1 ABL The 135V is used as the reference voltage through the resistor voltage divider consisting of R8040 R8039 R8038 R8037 and R8043 The combined voltage drop across R8036 and R8035 is used to turn off Q8007 and trigger the protection circuit I
18. 01 pin 8 Once the 24V is stable IC6501 s internal control circuit disconnects internally the power source at IC6501 pin 18 All IC6501 internal circuits are now powered from 1C6501 pin 8 Over Current Protection OCP ref Figure 3 3 The current flowing through the switching FETS Q6507 amp Q6506 also passes through T6502 pins 6 and 7 C6532 and resistor bank R6557 and R6556 The voltage drop across resistor bank R6557 and R6556 is directly proportional to the current through the switching FETS The voltage across R6557 and R6556 is further voltage divided by R6501 and R6505 and applied to IC6501 pin 9 The OCP is activated when the voltage at IC6501 pin 9 exceeds 0 2V The self diagnostic indicator will flash four times pause and then repeat 17 Over Voltage Protection OVP and Under Voltage Protection UVP The voltage at IC6501 pin 8 VC1 is monitored by circuitry inside IC6501 for Under voltage and Over voltage conditions The two conditions are as follows OVP greater than 33V UVP less than 8V If either of these two conditions occurs at IC6501 pin 8 the unit will go into protection mode The self diagnostic indicator will flash four times pause and then repeat Troubleshooting Tips ref Figure 3 3 NOTE Follow previously discussed IC6501 Startup Sequence The five steps are in order of occurrence NOTE Use HOT GRND when making measurements on primary side of T6502 This includes all measurements on IC6
19. 1 as the output transformer reference Figure 3 1 The HV power supply is located on the D board The HV power supply is activated simultaneously with the Main Converter power supply AC power is fed to the HV power supply from the AC RECT block D6530 which also feeds the Main Converter power supply The HV Converter output then drives the FB transformer which outputs the following voltages e High Voltage HV e Focus Voltage FV e G2 e ABL The Heater Voltage is scan derived using H Out Q5030 T5001 and IC5006 also located on the D board The Degauss Circuit reference Figure 3 1 will be activated after IC2300 M board receives an ON command from either the ON OFF button or the remote control and after one of the following events have occurred e The AC power was disconnected indicating that the TV was possibly relocated e The TV has been turned OFF for more then 15 minutes The base of Q501 receives a high from IC2300 pin 68 turning Q501 ON The ground path for the degauss relay RY501 and the base circuit of Q502 are completed through the collector emitter circuit of Q501 Q502 supplies the initial kick voltage and current to RY501 Once C504 in the base circuit charges completely Q502 will turn off and a hold voltage is supplied through D501 13V from the STBY Power Supply circuit RY501 switch closes and sends AC through the degauss coil eliminating any magnetic fields present in the metallic parts in the picture tube wh
20. 1C6501 12V 0 t ese E resos cesse Jees2s C lt lt 19V R6732 pg 793 Y 2 lt 4 106503 Q 135V DM 58 R6518 z PH6001 11V CONTROL R6505 133V 5 33V X D6517 36V FIGURE 3 7 DA 4X MAIN POWER SUPPLY CIRCUIT CP31P153 71513 11 6 02 The Main Switching Power supply is basically 1C6701 Switch Regulator Controller 1C6701 contains all the needed circuitry necessary to function as a switching power supply except for the Power Switching MOSFETS Q6701 and Q6702 1C6701 contains e Control circuit e Oscillator Oscillator control e Output Driver transistors e 10V regulator e Shut Off Timer e Over Current Protection 23 Main Switching Power Supply Operation Reference Figure 3 7 for the following circuit description AC signal is applied to the rectifier block D6702 The AC component is filtered out by the filter circuit shown in block form A DC voltage of 293V is produced at the output of the filter circuit 1C6701 Startup Sequence 1 Turn ON voltage The 279Vdc from the filter circuit is voltage divided by R6710 R6711 R6714 and R6721 down to 2 7Vdc This voltage is applied to IC6701 pin 1 Vsense and IC6701 turns ON 1C6701 pin1 Vsense is also used for OVP protection IC6701 pin 1 gt 8V will trigger OVP 2 Internal circuit Start Voltage The 279Vdc also passes through voltage dropping resistors R6702 and R6712 and 291Vdc is applied to IC6701 pin 18 This voltage is used to initially power the inte
21. 2 R 2 qi T 4 8 Q Law R6556 A9 R6501 R6505 PH6502 R6503 C6551 FIGURE 3 3 DA 4 MAIN POWER SUPPLY CIRCUIT gras MIS The Main Switching Power supply is basically IC6501 Switch Regulator Controller 1C6501 contains all the major circuitry necessary to function as a switching power supply except for the Power Switching MOSFETS Q6507 and Q6506 IC6501 contains e Control circuit e Oscillator Oscillator control e Output Driver transistors e 10V regulator e Shut Off Timer e Over Current Protection 16 Main Switching Power Supply Operation Reference Figure 3 3 for the following circuit description AC signal is applied to the rectifier block D6530 The AC component is filtered out by the filter circuit shown in block form A DC voltage of 293V is produced at the output of the filter circuit IC6501 Startup Sequence 1 2 3 4 5 Turn ON voltage The 293Vdc from the filter circuit is voltage divided by R6646 R6514 R6513 and R6517 down to 2 7Vdc This voltage is applied to IC6501 pin 1 Vsense and IC6501 tums ON 1C6501 pin1 Vsense is also used for OVP protection IC6501 pin 1 gt 8V will trigger OVP Internal circuit Start Voltage The 293Vdc also passes through voltage dropping resistors R6526 and R6536 and 279Vdc is applied to IC6501 pin 18 This voltage is used to initially power the internal circuits and begin oscillations Note that the 293Vdc from R6526 is connected d
22. 5002 pin 5 The parabola signal at IC5002 pin 5 is compared to the sawtooth waveform at IC5002 pin 6 This comparison causes the PWM signal at the output IC5002 pin 7 to vary in pulse width The change in pulse width causes more or less voltage to be applied to the horizontal output Q5030 collector during the vertical scan down the CRT This varying voltage causes a varying current to be applied to the H DY Current is gradually increased as the beam scans down until the current is maximum at the center of the CRT where the pincushion distortion is the most extreme The result is a good straight line scan down both sides of the CRT Heater Voltage The filament voltage is applied when the horizontal oscillator signal produces horizontal sweep The horizontal output transformer T5001 pin 1 outputs 7 7Vdc when power is ON This voltage is regulated to 6 1Vdc by IC5006 to become the main filament voltage H Centering and S Correction Also shown in Figure 6 1 is the H Centering circuit This circuit applies a small dc offset to the H DY to keep the picture centered on the CRT This function is performed dynamically through the service mode by varying the parabola waveform at CN5001 pin 6 HC PARA The HC PARA after is applied to IC5005 pin 2 and a dc offset is produce at IC5005 pin 4 The S Correction circuit is used to correct for the slight S shaped distortion that appears in each horizontal line Once again this function is performed dynamically thro
23. 501 Symptom Unit goes into protection mode LED flashes four times Check This indicates either a Vertical deflection or power supply problem 1 2 3 4 Check power supply secondary outputs e f voltages are present and at proper the level then the problem is in the Vertical deflection drive circuit e f the secondary voltages are low or missing then the problem is in the power supply The power supply can be safely tested by unloading the 135v line Unsolder R5013 This will unload the 135V line of the power supply but still send necessary feedback to IC6501 for proper power supply operation If the power supply outputs proper secondary voltages after unsoldering R5013 suspect a shorted 135V line If the unit still goes into protection mode after unsoldering R5013 check the following items e D6538 5V Zener for shorted condition e Check IC6505 B OVP for proper operation e 1C6501 pin 15 this is midpoint for output MOSFETS Q6507 and Q6506 A 275Vpp 85KHz square wave should be present If the waveform pulses four times and stops check the next Item e 106501 Feedback circuit The amount of current feedback can be determined by monitoring the voltage drop across R6525 The minimum current feedback is 80uA which is a minimum voltage drop of 37 6mV In normal operation this voltage drop is approximately 223mV If the voltage drop is below 37 6mV suspect components in the feedback path e g PH6502 and IC
24. 5V at the emitter of Q2314 D2310 will stop conducting Q2314 will turn OFF and a Low will be applied to IC2300 pin 43 IC2300 pin 69 will then turn OFF the AC relay The AC relay shuts down and the Stby Timer LED flashes a 6X sequence 44 Chapter 5 DA 4 amp DA 4X Video Processing DA 4 and DA 4X Acceptable Formats The acceptable inputs for these chassis are listed in Table 5 1 Table 5 1 DA 4 and DA 4X Inputs Air Ch 2 69 or Cable 1 125 NTSC Video 1 4 S or Composite Video 480i Video 5 6 Component Video Y PB PR 480i 480p 720p or 1080i Video 7 DVI Digital 1080i TO CH CX BOARD Overall Block Diagram A R G B IC2801 CRT DRIVE MEMORY DRC vie ea vT n CN3203 Ts M metre ec Rae 4e 43 S7 40 29 22 27 38 39 21 Ps5 34 Tsi 28 48 50 MAIN SUB CcNs51a3L k49L 146 1431 37 140 20 2227138 39 2i fest 34 St lasl TUNER TUNER Lier T eT CNS25 qT9 ia i5 air ispz2p2324 zs 4o pB7 est si p4 1e 7 CN523 Ltt L 1491 l N2302 L Tol tel It5 Teil hisled esto ost I L idol lzi leg Y 4 E PT CN2002 Y P SUB YUV R 5V D C2005 H IC2006 SUB Y C T COMPONENT IF CN2304 mo r CN7002 Y i STB MAIN IC2004 ag PECO DEA 5V 3D COMB MAIN YC D j 7 EES Ub BOARD i Cpg penea TASS AR TIBZLAMSLIPi4CNa000 As ere A19 ea EA cw 562 MAIN SUB
25. 6503 Reference Figure 3 3 for proper voltages at these components e f no waveform is present when the unit is turned ON then check IC6501 pins 1 and 18 for proper voltages reference IC6501 Startup Sequence above If these voltages check OK check IC6501 pin 8 for proper voltage of 24V This is the voltage used to power IC6501 after initial startup If 18V is present at IC6501 pin8 check IC6501 pin 10 for 10 2V This voltage is developed using the 18Vs and a voltage regulator circuit inside IC6501 If 10 2V is missing suspect a defective IC6501 Also check voltage at IC6501 pin 14 Use battery powered DVM for this measurement and use IC6501 pin 15 VS as ground ref The voltage at IC6501 pin 14 should be 10V If the voltage measured at IC6501 pin 14 is incorrect check D618 e f all the above measurements check OK suspect a defective IC6501 18 DA 4 High Voltage HV Power Supply Circuit R8054 R8055 FROM D6530 TO ARCING PROTECTION i D8015 CIRCUIT R8085 D8030 2 2 8 TO IC8001 PIN 5 6 PROTECT FROM MAIN POWER K 8 SUPPLY T6502 PIN 8 D8022 R8072 Co R8065 IC8004 D8009 BUFFER 15V FIGURE 3 4 DA 4 HV POWER SUPPLY CIRCUIT cesses 11 802 The HV Switching Power Supply uses the same switching IC as in the Main Power Supply MCZ3001D So the theory of operation of IC8002 will be identical to that of IC6501 reference IC6501 Startup Sequ
26. 6516 is bypassed when RY6502 Inrush Relay is energized and the switch is closed The operation of RY6502 is monitored using R6516 and PH6501 If RY6502 does not function a voltage drop will develop across R6515 which in turn develops a voltage across R6507 The voltage across R6507 turns on the LED and 11V is output on PH6501 pin 3 D6505 is now forward biased and a High is applied to the base of Q6532 turning it ON which then applies a Low to the base Q6530 turning it ON Q6532 and Q6530 is a latching circuit Once the latch is activated the voltage at the base of Q6527 is reduced and it turns OFF removing the ground path for the AC Relay and it turns OFF The TV shuts down and the Stby Timer LED flashes a 7X sequence B OVP Reference figure 4 2 The voltage level of the 135V line is monitored using IC6505 If the 135V increases at IC6505 pin 2 the voltage at IC6505 pin 2 will decrease Once IC6505 pin 2 decreases by 0 6V Q6522 will turn ON D6537 is now forward biased and a High is applied to the base of Q6532 turning it ON which then applies a Low to the base Q6530 turning it ON activating the latch Once the latch is activated the voltage at the base of Q6527 is reduced and it turns OFF removing the ground path for the AC Relay and it turns OFF The TV shuts down and the Stby Timer LED flashes a 3X sequence Low HV Protection Circuit Reference Figure 4 2 The HV level is monitored through the HV Regulator circuit IC8
27. A8 B8 where they are converted from differential format to single data lines and further amplified and applied to the MS1 Board The MS1 Board performs the following functions e Memory Stick System Control e JPEG Processing e Memory Stick Decoding The Memory Stick JPEG data is then converted into digital Y CB CR data on the MS1 Board The digital Y CB CR data is then sent back to the B Board and is D A converted to analog component video signals Y CB and CR which drive the CRT Troubleshooting Tips 1 2 3 4 All three boards HM Band MS1 are Not Field Repairable Confirm CN7202 pin 15 MS INS goes low when Memory Stick is inserted Confirm CN7202 pin 3 3 3V supply Confirm CN7202 pins 5 through 14 have data activity during the following two events a When the Memory Stick is initially inserted and woes wee b When an image is selected for display on the CRT 5 Confirm the voltages and signals in steps 2 3 and 4 are applied to CN3603 pins B3 A4 B4 through A8 B8 and B9 6 If all voltages and signals are applied to the B Board further troubleshooting will be board swap due to inaccessibility to connectors on the B Board and MS1 Board There is not much signal processing performed on the B Board so the most likely defect at this point would be the MS1 Board 11 Chapter 3 Power Supply DA 4 amp DA 4X Chassis This chapter will cover the power supply section for both the DA 4 and DA 4X c
28. ANDEN D BOARD 135V EM AC RECT TEM RY6502 BLOCK D6530 INRUSH RELAY IC8002 eh FROM HV POWER T8001 FV UNREG SUPPLY FBT ABL 11V DF H OUT HOT Q5030 T5001 1C5006 H1 HEATER FIGURE 3 1 DA 4 POWER SUPPLY OVERALL BLOCK C31P15 3 1 1509 10 28 02 12 DA 4 Overall Power Supply Block Description Once 120V AC power is applied to the TV set set plugged into the AC outlet the Standby 5V power supply located on the A board is active and outputs regulated 5V reference Figure 3 1 The STBY SV is sent to the M board to partially power up system control IC2300 and is also sent to the HA HC board to power the Remote Control Sensor SIRCS The Main Converter power supply DA 4 located on the D board is fed AC from A Board through the AC Relay RY6501 and through Inrush Current resistor R6516 This limits the initial high current produced when the TV set is first turned ON The Inrush Current resistor R6516 is removed from the AC input path using RY6501 Once the Main Converter power is up and running the unreg11V output is fed back to RY6501 the relay switch is closed and R6516 is bypassed in normal operation The Main Converter power supply outputs the following voltages e 15V e Unreg7V e Unreg5V e Unreg11V e 36 5V e 135 e 200 The High Voltage HV on the DA 4 chassis is developed using a switch mode power supply identical to the one found in the Main Converter power supply except for the use of the Flyback FB T800
29. D DA 4X AUDIO BLOCK 58 VAR FIX LR A MUTE FROM IC2300 M BOARD C31P15 8 1 1530 11 4 02 Reference Figure 8 1 IC1502 is an Audio Video Switch located on the U board which selects both audio and video using the PC bus from Main Micro IC2300 not shown The following audio inputs are available to IC1502 e Audio 1 4 e Audio 7 e TU1 amp 2 The selected audio is then sent to the M board through CN1502 pins B25 amp A25 U board and CN2006 pins B25 amp A25 M board and applied to the audio processor IC2501 Audio inputs 5 amp 6 from the U board are applied directly to the audio processor IC2501 U board through CN1502 pins B5 A5 B3 and A3 U Board and CN2006 pins B5 A5 B3 and A3 U BoarQ The Monitor L R output also is output from the AV Switch IC1502 applied to Q1504 buffer and Q1503 buffer and then to J1503 The audio processor IC2501 takes the main audio input and produces a main L R output and sub woofer WL WR output 102501 also produces the Steady Sound feature These outputs are then passed to the A board through CN2002 pins 2 4 6 and 7 M board and CN523 pins 2 4 6 and 7 A board Next they are applied to the audio amplifies IC509 pins 2 amp 4 Midrange and IC1508 pins 2 and 4 Woofer Note IC508 is not used in the DA 4X chassis projection set The low frequencies are enhanced in the protection set used the DAC Speaker System The DAC system uses the Midrange speakers TV cabinet as a
30. IC6502 pin 2 1C6502 pin 3 Grnd will be now more positive then the negative IC6502 pin 2 a High is produced at IC6502 pin 1 and D6526 is forward biased The latch is activated and the AC relay is turned OFF Note that the High from IC6502 pin1 is also sent to System Control C2300 to activate self diagnostics B OVP Reference Figure 4 7 The B OVP circuit monitors the voltage level of the 135V through the voltage divider network consisting of R6535 R6536 R6516 and R6517 If the 135V should rise so will the voltage drop across R6517and the voltage at IC6502 pin 5 Once the voltage at IC6502 pin 5 goes more positive then IC6502 pin 6 a High will be produced at IC6502 pin 7 and D6525 will be forward biased The Latch will activate and the AC relay will be shut OFF Note that the High from IC6502 pin7 is also sent to System Control IC2300 to activate self diagnostics AC PROT Reference Figure 4 7 The AC input to the Standby 5V circuit is monitored through D528 D529 and Q528 In normal operation D528 is in break over mode and Q528 in turned ON If the AC input is missing Q528 will turn OFF and a High will forward bias D6527 the Latch will be activated and the AC relay will be shut OFF 40 DA 4X Horizontal Vertical IK and HV Protection Circuits IC2801 VPROT Y CCRT DRIVE IC8005 R8260 gy PIN 16 gt l VREG D8052 0 6V E Paci D8051 IC9101 R8262 OV VOUT VIDEOOUT 7 IC8003 ne VERTICAL DRIVE E V PROTECTION
31. K ii R8011 IC8001 O 5 3 e072 7 EB u ie T o K ou R8135 ox 9 C8021 2 2V 15V gt MA 4 5V 7 4V amp R8052 TO R8136 R8137 dn HORIZONTAL E DEFLECTION IC8104 YOKE 9V RR VREF H Q5021 D8140 G DRIVE C5o5g BUFFER a K NOTE RBOI HAUT b HOT GROUND bee a Q5025 BUFFER SECTION 19V Jr NV A5V FROM T6502 PIN 8 A R5118 D5018 15V FIGURE 4 8 DA 4 EXCESSIVE HV AND HORIZONTAL DEFLECTION PROTECTION CIRCUITS C31P15 4 31518 11 12 02 Excessive HV Circuit Reference Figure 4 3 The HV is monitored at FBT pin 5 using two comparator circuits A amp B located in IC8001 Comparator A will be triggered when there is a sustained excessive HV or gradual HV increase and comparator B will trigger on a momentary or fast increase HV surge Another way to look at these comparators circuits is that they are backup circuits for each other redundant circuits to ensure shutdown under any excessive HV condition 31 Both comparators receive a sample of the HV from FBT pin 5 which is input to IC8001 pin 5 and IC8001 pin3 A reference voltage Vref of 2 2V is developed at IC8014 pin 3 and applied to IC8001 pins 2 and 6 Once the voltage at either IC8001 pin 5 or 3 increases above the reference voltage due to an excessive HV conditions a High will be output at either IC8001 pin 7 or 1 The High output will turn ON either Q8004 or Q8003 which will then apply a Low to IC8002 pin 1 V sense turning the HV power supply conve
32. SONY Training Manual KV 36HV500 KV 57WV700 Direct View Projection Television Troubleshooting DA 4 amp DA 4X Chassis Models DA 4 DA 4X KV 32HS500 KP 57WV600 KV 32HV600 KP 57WV700 KV 34XBR800 KP 65WV600 KV 36HS500 KP 65WV700 KV 36XBR800 KV 40XBR800 Theory of Operation amp Practical Troubleshooting Tips Course C31P15 Table of Contents 1 DA 4 amp DA 4X Introduction and PCB Interconnection 1 IMMFOCGUCHION aiina i aeter stat aoe R as 1 DA 4 amp DA 4X PCD Interconnection 1 2 New Features DA 4 Chassis 6 Serolling Index uec ene teat eect 6 Digital Visual Interface DVI 6 Memory Stick Interface sss 8 3 Power Supply DA 4 amp DA 4X Chassis 12 DA 4 Chassis Power Supply 12 DA 4X Chassis Power Supply 20 DA 4 amp DA 4X Regulators 26 4 DA 4 amp DA 4X Protection Circuits 27 DA 4 Protection Circuits 27 DA 4X Protection Circuits 37 5 DA 4 amp DA 4X Video Procesing 45 DA 4 amp DA 4X Acceptable Inputs 45 Overall Block Diagram sss 45 6 DA 4 amp DA 4X Chassis Deflection Circuit
33. TECTION PROTECTION PROTECTION PROTECTION CR CT CG J IC8005 IC8003 IC8006 BOARDS Q8044 N DY 7X jefe AT t e a ea QN FBT PIN 11 ABE FBT OCP amp D BOARD LOW HV SWITCH PROTECTION Q8022 FROM 1C8007 i IC8008 PIN 10 7X H DRV SIGNAL i FBT PIN 11 FBT OCP amp Figure 4 6 is a basic block diagram illustrating the interconnection of the protection circuit System control and the AC relay Also shown on the diagram is the Standby Timer LED flash sequence for when the particular protection circuit is triggered e g 4X will occur with a vertical deflection failure Each protection circuit will be discussed in greater detail in coming diagrams The purpose for each protection circuit is indicated by the name of the particular block 37 Reference Figure 4 6 Q2314 monitors the 5V dc level If the dc level falls below 4 5V Q2314 detects this error and the AC input is disconnected RY6702 is used to remove the Inrush Current resistor from the AC input circuit after initial set turn on If the relay failures to activate AC input is disconnected IC9101 9201 and 9301 on the CR CB CG boards are the cathode drive ICs Each IC produces a separate IK pulse directly proportional to the current in each cathode The current in each cathode indicates the physical condition of the cathode Depending on the cathode condition the set will either increase RGB drive to the cathode
34. a and outputs analog component video Y PB PR to CN7002 pins 10 8 and 6 respectively Memory Stick Interface Introduction Memory Stick is a new compact portable and versatile Integrated Circuit Recording Medium with a data capacity that exceeds that of a floppy disk The internal memory circuit structure is a type of Flash Memory similar to that found in a personal computer It is a solid state design which basically means there are no moving parts Inside the Memory Stick is a grid of columns and rows with a two transistor cell at each intersection point on the gird which is used to store a 1 or 0 The Memory Stick is specially designed for the exchange and sharing of digital data among Memory Stick compatible products such as Digital Still Cameras and Digital Video Cameras Because it is removable Memory Stick can also be used for external data storage Memory Stick technology allows you to view on the TV digital JPEG still images that are stored on Memory Stick medium You can choose from an index of the images stored on the Memory Stick or you can run a slideshow of those images The DA 4 and DA 4X chassis Memory Stick viewer can display ONLY Still Images that have been recorded on Memory Stick media by Sony brand digital still and video cameras Recorded images must meet the following specifications gt Compression format JPEG gt File format DCF compliant NOTE Most Sony brand digital still and video
35. able 1 1 DA 4 amp DA 4X PCB Circuits and Repair Information Board Circuits DA 4 Circuits DA 4X Field Comments dise ad No DY Conv Circuit for DA 4X Chassis Flash Board Level DA 4X chassis Focus Repair ONLY Picture Centering 5V Reg Board Level Repair H Protect V Protect AD DRC MID XA HD ADC CRT Drive A D DNR amp SRAM Differential Input Memory Stick 1 8V Reg 2 5V Regs 3V Reg 3 3V Reg 3 3V Reg 5V Reg 5V Reg H HS or CR CG CB Possible X HV XBR Component e RGB Drive Gene Level Repair e H amp V H amp V Drive Possible Drive H amp VD Component H amp V DY HV Drive Level Repair Main Convergence Power Amps Supply 12V Reg 15V 5V Reg 7V 210V 5V 135V 11V Heater Do Protection Circuits 33V HV Protect Heater HD Drive HV Power 4135 OVP OCP Supply e Protection Circuits HV Protect 4135 OVP OCP HD Protect IK Protect H Protect V Protect e AD DRC MID XA HD ADC e CRT Drive e A D DNR e Differential Input Memory Stick 1 8V Reg 2 5V Regs 3V Reg Additional Circuits on DA 4X chassis e Extra VM circuits D Brd RGB connecti ons SRAM IC3001 Separate RGB drive boards in DA 4X chassis Main Power Supply located on D Brd in DA 4 chassis Main Power Supply located on G Board in DA 4X Chassis N S Correction E W Correction Key Input LED Remote Control Key Input LED Re
36. aintain optimal white balance Each cathode is monitored by the individual driver IC9001 9002 and 9003 on the CH CX board Each driver IC9001 pin 7 IC9002 pin 7 and IC9003 pin 7 develops an IK feedback pulse which is directly proportional to the current drawn by each cathode in the CRT The IK feedback pulse passes through buffer transistors Q9007 Q9015 and Q9013 and then the sequence of the three IK feedback pulses is applied to the base of buffer Q9001 The three IK feedback pulses are sequentially fed into IC2801 pin 24 and monitored for amplitude variations If the IK feedback pulse is Low in amplitude or is missing this indicates a weak or defective cathode 1C2801 pin 24 will detect this condition and the unit will go into IK protection mode The TV video is muted the AC relay will remain ON and the Stby Timer LED flashes a 5X sequence 36 DA 4X Protection Circuits Overall Block Diagram AC RLY SYSCON IC2300 RY6701 ne ME Q6503 LATCH G BOARD Q6502 Q6504 AC RELAY IC2801 Y C CRT DRIVE D6523 X D6527 eru rra IN RUSH RELAY B AC PROT PROTECTION Aes a528 RY6702 ox ABOARD SSL SL J ABL EXCESSIVE HV SWITCH PROTECTION Q8021 FBT PIN 6 IC8006 FIGURE 4 6 DA 4X PROTECTION CIRCUITS OVERALL BLOCK c31P15 46 10 28 02 t oed dai Uni a mde uas nr iid tame uie AO Sid CER RER HORIZONTAL VERTICAL HIGH WHITE BALANCE DEFLECTION DEFLECTION VOLTAGE PRO
37. board DRC and MID processing The DRC circuit will double the horizontal frequency for input signals with 15 75KHz NTSC horizontal inputs The MID circuit will up convert the horizontal frequency of the input signal to 33 75KHz which is the scan rate of the DA 4 and DA 4X chassis Table 5 2 shows the signal standard and its associate horizontal frequency mpursgna HermnmiFrequemy The following is a description of the signal flow for each standard listed in Table 5 2 e 15 734KHz input DRC circuit up converts to 31 5KHz and MID circuit up converters to 33 75KHz e 31 5KHz input MID circuit up converts to 33 75KHz e 33 75KHz input XBR HV pass through MID HS bypass MID circuit e 45KHz input MID circuit down converts to 33 75KHz The output of the MID circuit is then applied to the CRT drive IC2801 which will then drive the CH CX boards in the DA 4 shown in Figures 5 2 and 5 3 and CR CG CB boards in the DA 4X chassis boards not shown but the circuit operation is same as Figure 5 2 I CN2805 CN9001 NOTE CIRCUIT OPERATION IS IDENTICAL FOR DA 4X THE IC s ARE LOCATED ON SEPARATE BOARDS CR CG CB FIGURE 5 2 DA 4 CX BOARD HV amp XBR C31P15 5 21524 11 12 02 48 IC9001 12V uj IK 8 8 IC9003 _ B 8 IK 200V HEATER 4 4 FIGURE 5 3 DA 4 CH BOARD HS 031P1558 10702 Troubleshooting Board Level Reference Figure
38. cameras automatically record still images using DCF Design rule for Camera File system compliant directory and file names as shown in Figure 2 3 IMAGE DIRECTORY NAME DSC0002 IMAGEFILE NAMES DSC0003 NOTE DO NOT RENAME DIRECTORIES IF THE NAMES ARE CHANGED THE STILL IMAGES CANNOT BE DISPLAYED ON YOUR TV FIGURE 2 3 DCF DIRECTORY C31P15 2 3 1504 9 26 02 The main advantage of the Memory Stick is its size which measures approximately 2 x3 4 x1 8 making it extremely portable reference Figure 2 3 However do not let the size fool you the Memory Stick amp comes in five data capacity ratings 8MB 16MB 32MB 64MB 128MB and 256MB Note The DA 4 and DA 4X chassis Memory Stick viewer is compatible with Memory Sticks up to and including 128MB The 256MB Memory Stick is not compatible 8 MEMORY STICK TOP VIEW VIEW OF LOWER SIDE FIGURE 2 4 MEMORY STICK DIMENSIONS C31P15 2 4 1505 9 16 02 The DA 4 and DA 4X Memory Stick viewer cannot display any of the following gt Images recorded on digital still cameras and digital video cameras that are not Sony brand gt Images recorded using products that are not DCF complaint including the following Sony products e Digital still cameras DSC D700 DSC D770 e Digital video cameras DCR TRV900 DSR PD100A Images stored on a Memory Stick that has a capacity that exceeds 128MB Images stored in TIFF or any other non JPEG compression forma
39. components in the feedback path e g PH602 and IC604 Reference Figure 3 7 for proper voltages at these components If no waveform is present when unit is turned ON then check IC6701 pins 1 and 18 for proper voltages reference IC600 Startup Sequence above If these voltages check OK check IC600 pin 8 for proper voltage of 18V This is the voltage used to power IC6701 after initial startup If 18V is present at C6701 pin8 check IC6701 pin 10 for 10 2V This voltage is developed using the 18Vs and a voltage regulator circuit inside IC6701 If 10 2V is missing suspect a defective 1C6701 Also check voltage at IC600 pin 14 Use battery powered DVM for this measurement and use IC6701 pin 15 VS as ground ref The voltage at IC6701 pin 14 should be 10V If the voltage measured at IC6701 pin 14 is incorrect check D6712 If all the above measurements check OK suspect a defective IC600 25 DA 4 amp DA 4X Regulators DA 4 amp DA 4X Regulator Interconnect Diagram gt DA4X ONLY 7 i li IC8010 O 45V l l UNREG 7V 1 ii DA4 amp DA4X ee see i 1C8004 DA4X IC6500 12v REG 15V gt UNREG 7V 12 112 IC502 i UNREG 5V 3 3v REG Q gt 3 3V UNREG 11V o 9V REG FIGURE 3 8 DA 4 amp DA 4X REGULATOR INTERCONNECT DIAGRAM C31P15 3 8 10 9 02 The interconnect diagram shown in Figure 3 8 illustrates how the unregulated voltages produced on the D board DA 4 and G boa
40. e is achieved If white balance cannot be achieve within two seconds then IC2801 pin 52 will communicate with IC2300 pin 31 and the TV will go into IK protection mode The video to the CRT will be blanked and the standby timer LED will flash a 5X sequence The AC power and Audio will remain ON 42 DA 4X HV OVP and FBT OCP Protection Circuits Q8042 H DRIVE Q8041 C8160 FROM e Ic2801 7 A 4135V D BOARD A ran K R8198 R8132 R8131 R8195 ATA GI Seiad R8193 415V R8192 R8169 REF 4 FBT 15V D8043 D8025 2b OCP D8008 R8173 Dl KI TN Q8028 R8153 8029 R8151 P IC8008 R8219 R8150 R8157 H DRIVE K HV OVP 3 C8129 PWM OUT HV OVP R8190 TO Q8035 FIGURE 4 9 DA 4X HV OVP AND FBT OCP PROTECTION CIRCUITS HV OVP and FBT OCP or Beam Current Protection Circuit HV level and current are monitored by IC8006 and IC8007 They will stop high voltage generation to provide protection for the HV components CRTs and X radiation level This is accomplished by disabling the H drive pulse from the video processor IC2801 not shown IC8007 pin 3 monitors a sample of the HV coming from the HV Block If the HV should increase IC8007 pin 3 will become more positive then the reference at IC8007 pin 2 and IC8007 pin1 will output a High D8008 will now forward bias and apply a High to IC8007 pin 5 and a High will be output at IC8007 pin 7 Q8022 will turn ON and a ground will be placed on the emitter of buffer Q8041 stoppi
41. e voltage at IC5007 pin 5 will decrease Once the voltage level at IC5007 pin 5 decrease below the reference voltage level at C5007 pin 4 1 6V the comparator output IC5007 pin 2 will go Low and turn Q5018 OFF A High through pull up resistor R5104 is now applied to IC2801 pin 57 H Prot through forward biased D5006 IC2801 will mute the video and communicate via IC2801 pin 52 with IC2300 pin 31 to shut off the AC relay at IC2300 pin 69 33 The TV video is muted the AC relay shuts down and the Stby Timer LED flashes a 7X sequence B OCP Protection Circuit Reference figure 4 4 The current in the 135V line is monitored using R5013 and Q5004 R5013 is the current sensing resistor The current in the 135V line flows directly through R5013 The voltage drop across R5013 in normal operation is very low approximately 0 2V So the 135V is passed with very little loss in normal operation The voltage on the left side is basically equal to the voltage on the right side of R5013 and because R5013 is connected across the base emitter junction of Q5004 there is no 0 6V difference across the junction and Q5004 is OFF When the current in the 135V line begins to increase due to a defect the voltage drop across R5013 will also increase Because of the increased voltage drop across R5013 the voltage on the left side of R5013 will remain constant but the voltage on the right side of R5013 will decrease The decreased voltage on the right side is a
42. easurements on primary side of T6703 This includes all measurements on IC6701 Symptom Unit goes into protection mode LED flashes four times Check This indicates either a Vertical deflection or Power Supply problem 1 Check power supply secondary outputs If voltages are present and at the proper level then the problem is in the Vertical deflection drive circuit 3 If the secondary voltages are low or missing then the problem is in the power supply The power supply can be safely tested by unloading the 135v line Unsolder 16514 This will unload the 135V line of the power supply but still send necessary feedback to 1C6701 for proper power supply operation 5 Ifthe power supply outputs proper secondary voltages after unsoldering 16514 suspect a shorted 135V line Check the Horizontal Output transistor Q505 or 506 for shorted conditions 6 If the unit still goes into protection mode after unsoldering IC6514 check the following items 1C6701 pin 15 this is midpoint for output MOSFETS Q600 Q6701 and Q6702 A 275Vpp 78KHz square wave should be present If the waveform pulses four times and stops check the next Item IC6701 Feedback circuit The amount of current feedback can be determined by monitoring the voltage drop across R6732 The minimum current feedback is 80uA which is a minimum voltage drop of 37 6mV In normal operation this voltage drop is approximately 223mV If the voltage drop is below 37 6mV suspect
43. ee l HDT T5002 R5150 X aie C5071 i Ted WN i Hi 2 2 Q5035 UN 29V Q5027 6 1 PP 5030 R513077 135V X L ms Spout HEATER TO IC5005 IC5005 ik pep HOT T5001 Op d HCENT GE T5001 PINS b KA 5V TO IC5005 REF om CENTERING l C5041 FROM E 7 6 REFERENCE ou 15008 C5040 HC PARA i l 5V TO IC5005 HOR 19V To ICc4004 4 45y VERTICAL OUT us C D5003 D BOARD FROM CN5001 PIN 10 EW_PARA Q5031 P S CORR C5064 R5148 FROM Q5003 LOU IS CN5001 8 7 a C5066 PIN 10 o iy cb E PLS H OUT MP_PARA J T O FEEDBACK FROM T5001 4 50307 JU L 3375kHz N N ie PP 10Vp p FROM Q5006 PP FIGURE 6 1 DA 4 HORIZONTAL DEFLECTION CIRCUIT C3P15 6 1 1527 11 11 02 Horizontal Drive Circuit Reference Figure 6 1 This circuit is split between an oscillator on the B board and an output stage on the D board The 33 75KHz horizontal oscillator is in the Y C Jungle IC2801 1C2801 pin 4 outputs a 3Vpp rectangular waveform H DRV On the D board the H DRV waveform is amplified through Q5035 and Q5036 and then applied to buffer Q5027 The MOSFET driver Q5028 and the output transistor Q5030 amplify the signal to provide sufficient current to drive the HOT T5001 and the H DY deflection yoke At the output stage the HOT T5001 has a secondary winding that provides filament voltage and also 15V for the vertical driver IC5004 and the horizontal centering circuit IC5005 The wav
44. eforms shown on Figure 6 1 are the typical horizontal circuit signal shapes The difference between this set and a conventional set is the horizontal frequency which is 33 75KHz as opposed to 15 75KHz scan rate in the conventional set The 33 75Khz scan rate is considered a high definition horizontal scan rate 51 PWM Circuit Reference Figure 6 1 The PWM circuit Q5003 has two functions First it provides a regulated 102Vdc output for the horizontal output transistor Q5030 Second it compensates for horizontal pincushion affect and keeps the picture vertical edges straight Regulator The PWM circuit regulates 135Vdc from the power supply down to 102Vdc Horizontal pulses from IC8004 pin 1 not shown in Figure 6 1 in the HV power supply section drive Q5003 The pulses are amplified and output to the HOT T5001 pin 4 To control the output voltage the output is sampled and used to change the pulse width of the H drive pulses These changes regulate the output voltage to 102Vdc at T5001 pin 4 Pincushion Correction If the PWM output voltage at T5001 pin 4 were changed the horizontal picture size would vary accordingly A vertical pincushion signal is produced at IC2801 pin 11 not shown and is applied to the PWM circuit to increase the picture width and compensate for the pincushion distortion The EW PARA parabola signal form CN5001 pin 1 D board is first applied to IC5001 pin 6 and output on IC5001 pin 7 and then applied to IC
45. ence text for details except for the following differences IC8002 pin 18 is not used because VC1 is supplied from the T6502 pin 8 in the Main Power Supply circuit Pin 18 is only needed when the switching IC MCZ3001D must supply its own VC1 through the output transformer 19 DA 4X Chassis Power Supply VD501 T510 T511 STBY 5V STBY 5V A BOARD UNREG 7V UNREG 11V G BOARD UNREG 5V FROM D508 D509 MAIN 12V POWER E SUPPLY 19V amp RELAYS jAy INRUSH RELAY 36 5V 135V 33V H DRIVE FIGURE 3 5 DA 4X POWER SUPPLY OVERALL BLOCK oy MISES The A board in the DA 4X chassis is identical to the A board in the DA 4 chassis except for small mute and protections circuits which will be discussed later The 120V AC input is applied to the A board and is applied to the STBY 5V power supply Regulator STBY 5V is sent to the M Board to partially power system control IC2300 and also to the HA HC board to power the Remote Control Sensor SIRCS The Main Converter power supply for the DA 4X chassis is located on the G board The circuitry and the operation of the Main Converter power supply in the DA 4X are identical to the DA 4 chassis except for three additional output voltages 19V 12V and 33V and the exclusion of the 200V line e 19V e 15V e Unreg 7V 20 e Unreg 5V e Unreg 11V e 12V e 33V e 36 5V e 135 The 200V HV FV G2 and Heater are all scan derived on the D board in t
46. etworks Network Location Purpose Pr SG SCLK ee gU Wa 31 28 Main upos g System Control Micro BDAT BCLK IC2300 pins 30 29 Main NVM1 IC2302 Control Micro DO CO IC3090 pins 95 97 MID MID Processing Control Micro DA 4 and DA 4X Data Communications Diagram IC2300 MAIN MICRO BDAT 1C2302 M BOARD ecu oe NVM U BOARD CN2006 CN1502 PAA II Meses IC2004 IC2005 IC2304 IC2303 IC2200 IC2504 IC1502 lt COPIE YCT YCT SUB CCD amp MAIN CCD amp 3D AUDIO AN MAIN SUB V CHIP V CHIP COMB SWITCH J 20 18 CN2302 CN2302 20 18 ID elses ae se EIOS CNet ee ae CN507 IC903 10 TU501 usc lt TEST 10 e me Six DY CONN CONNECTOR MAD A ABOARD a fer ete ERES x eS sen pesos os eee CN3203 T pon 1C3003 IC8601 pro 13303 Te A D DNR AD lt DRC a ZN Qe Bespez CN3601 NVM CLK pes pz2 2 CN104 V IC121 ee ee ee c SOCKET CREE NUS ase wn at m d l FIGURE 7 1 DA 4 amp DA AX DATA COMMUNIATIONS DIAGRAM CSIPIS ET 10 7102 56 Reference Figure 7 1 Main Micro IC2300 generates the clock signal for communications bus network SDAT SCLK and BDAT BCLK Bus network SDAT SCLK is used to send data to most of the ICs in the TV set Network BDAT BCLK is dedicated communications to the NVM IC2302 on the M board At power ON the user and deflection data in IC2302 is retrieved by IC2300 using network BDAT BCLK and passed to the a
47. flection output drive IC A feedback pulse is produced at IC5004 pin 3 If a vertical failure occurs the feedback pulse is not produced and the video is muted AC input and Audio remain ON Q2314 monitors the 5V dc level If the dc level falls below 4 5V Q2314 detects this error and the AC input is disconnected 1C9001 9002 and 9003 on the CH CX board are the cathode drive ICs Each IC produces a separate IK pulse directly proportional to the current in each cathode The current in each cathode indicates the physical condition of the cathode Depending on the cathode condition the set will either increase RGB drive to the cathode or go into IK Protection mode RY6502 is used to bypass the Inrush Current resistor from the AC input circuit after initial set turn on If the relay failures to activate AC input is disconnected IC8006 monitors the HV output If the HV is low IC8006 detects this condition and the AC input is disconnected IC6505 monitors the 135 voltage level If the voltage increases IC6505 will disconnect the AC input Q8007 monitors the current in the FBT secondary If the current increases Q8007 will disconnect the AC input Q8007 works simultaneously with Q8008 which mutes the video output IC8001 monitors the HV level NOTE this circuit is on the HOT or primary side of the transformer so use HOT Ground for measurements If the HV increases IC8001 will turn off the HV converter IC8002 IC8006 monitors the horizonta
48. g DC voltage 13V is applied to the input pin of IC501 5V regulator which then supplies regulated 5V to the following components e 102300 System Control M board e 102302 NVM M board e 102305 3 3V Regulator M board e Q2312 Remote Input Buffer e HA HC boards Key Input LED and Remote Sensor Power ON Switching Circuit Reference Figure 3 6 during the following circuit description In the Standby mode System Control IC2300 is partially powered using STBY 5V and 3 3V and waiting for an ON command from either the Front Panel Controls IC2300 pins 93 and 94 or the Remote Control IC2300 pin 7 circuit not shown Once the ON command is received IC2300 pin 69 AC RLY outputs a high which is applied to the base of Q6503 turning Q6503 ON This completes the ground path for the AC Relay RY6701 and for the base circuit of Q503 Q503 turns on and supplies the initial kick voltage and current through D508 to RY6701 closing the relay switch and supplying AC power to the Main Power Supply through Inrush resistor R6705 and D6702 Once C513 in the base circuit charges completely Q503 turns off D508 reverse biases and D509 forward biases supplying a hold voltage 9V to keep the relay switch closed in the ON mode At this point the Main Power supply is turning ON operation will be discussed next The initial AC power to the Main Power Supply is through Inrush resistor R6705 which limits the high surge current that occurs momentarily at
49. hassis The degauss circuit for the DA 4 chassis will also be discussed The power supplies for the DA 4 and DA 4X chassis are almost identical except in the following two main areas 1 High Voltage HV development The HV on the DA 4 chassis is Switch mode power supply derived whereas the HV on the DA 4X chassis is scan derived 2 Circuit Location On the DA 4 chassis the power supply circuitry is located on the A and D boards whereas on the DA 4X chassis the circuitry is on the A D and G boards Except for the development of the HV the circuit operation for the Standby 5V and Main Converter Power Supplies is identical Notes and references are placed on each diagram where the circuit operation is identical between the two chassis The circuit itself may be located on a different board and component reference numbers may be different but the components are the same As you read this section note the similarities and differences between the DA 4 and DA 4X chassis DA 4 Chassis Power Supply DA 4 Overall Power Supply Block T510 T511 VD501 gt STANDBY 5V STANDBY 2 HA HE BD acq POWER 5V CIRCUIT MED SUPPLY I bes FH501 13V FROM 5V STBY DER 3 D503 C506 TH501 DGC ON FROM IC2300 A BOARD SMED fora m db Ae ne se aT ac Be ate ete cepto EN AT col a ig E i GND FROM Q652 CN6502 36 5V J 15V AC 1 M RELAY IC6501 UNREG 7V RY6501 MAIN UNREG 5V POWER FROM D508 D509 SUPPLY ANE
50. he DA AX chassis The horizontal output Q8043 drives T8004 to produce the 200 and Heater voltages and also drives T8005 FBT to produce HV FV G2 and ABL voltages e High Voltage HV e Focus Voltage FV e G2 e 200V e Heater e ABL DA 4X STBY 5V Power Supply amp Power On Switching Circuit TO G BOARD 7502 3 AC TO D6702 xum 2195 1510 1511 CNO7DT BERN HAC i SOLENOID BD 3 Neu Mii pi ON 20V Q2312 ie STBY 23V 1C2300 08 J SYSCON Q IC2302 NVM eT N Z 2508 102305 3 3V R513 BEG i TO D6702 MAIN POWER SUPPLY RY6701 AC RELAY RY6702 INRUSH RELAY pee Saas ere 12V D6501 FROM IC6501 CIRCUIT OPERATION IS THE SAME FOR BOTH DA4 amp DA4X CHASSIS FIGURE 3 6 DA 4X STANDBY 5V POWER SUPPLY amp POWER ON SWITCHING CIRCUIT C31P15 3 6A 1514 11 7 02 21 Standby 5V Power Supply Reference Figure 3 6 during the following circuit description The Standby Power Supply located on the A board is operational as long as the set is plugged into an AC outlet AC power is applied to T502 through fuse FH501 and chokes L510 and L511 T502 couples the AC across to D503 rectifier block and filter capacitor C507 AC is also coupled to Q503 this is part of the power on switching circuit which will be discussed next The Standby 5V power supply is a simple conventional full wave only two diodes in D503 are used rectifier circuit The resultin
51. ich could cause color purity problems The degauss relay remains closed for approximately six seconds and then opens 13 Three relay clicks will be heard when the set is first turned on in the following order 1 Degauss Relay RY501 2 AC Relay RY6501 3 Inrush Current Relay RY6502 DA 4 STBY 5V Power Supply and Power On Switching Circuit giis AC ud D6530 ABOARD TO RY501 D501 DEGAUSS RELAY T SOLENOID T INPUT sJ ON20V EL STBY 23V D508 vel co ERO ic2302 NVM CN6502 CN514 gos poser lt TO D6530 MAIN POWER SUPPLY AC RELAY RY6501 RY6502 INRUSH RELAY D BOARD UNREG 11V OUTPUT FROM MAIN POWER SUPPLY does m ea ee a a Ga il aa E D6533 NOTE CIRCUIT OPERATION IS THE SAME FOR BOTH DA 4 amp DA 4X CHASSIS FIGURE 3 2 DA 4 STANDBY 5V POWER SUPPLY amp POWER ON SWITCHING CIRCUIT C31P15 3 2 1508 11 12 02 Standby 5V Power Supply Reference Figure 3 2 during the following circuit description The Standby Power Supply located on the A board is operational as long as the set is plugged into an AC outlet AC power is applied to T502 through fuse FH501 and chokes L510 and L511 T502 couples the AC across to D503 rectifier block and filter capacitor C507 AC is also coupled to Q503 this is part of the power on switching circuit which will be discussed next The Standby 5V power supply is a simple conventional full wave only two diodes in D503 are used
52. irectly to the Drain of Q6507 and serves as the High side FET power source Internal circuits initially powered by IC6501 pin 18 e Internal drive transistors for High side output FET Q6507 e Oscillator e Control circuit e 10V regulator IC6501 pin 10 Note The 10V output at IC6501 pin 10 passes through D6502 and supplies power to the internal driver transistor for the Low side output FET Q6506 Output Oscillations At this point initial square wave oscillations of approximately 125KHz are output at 1C6501 pins 16 and 12 Normal operation frequency is approximately 85KHz Regulator Feedback The feedback line is connected to the 135V secondary output Once IC6501 is turned ON and oscillations begin the secondary winding at T6502 pin 13 and associated circuitry produces 135V The 135V is applied to IC6503 pin 1 DM 58 Control IC6503 controls the voltage at the PH6502 pin 2 which controls the current output of the optic coupler PH6502 The amount of current supplied to IC6501 pin 2 depends on how hard PH6502 is turned ON In normal operation a voltage of 1 9Vdc which is proportional to the amount of current is present at IC6501 pin 2 The feedback loop is now complete IC6501 normal operating power supply VC1 Produced simultaneously with the oscillator feedback is the operating power source VC1 IC6501 pin 8 VC1 is produced using a winding on T6502 pin 8 The AC is rectified and filtered and a DC voltage of 18V is applied to IC65
53. l deflection output drive If the horizontal deflection stops IC8006 will turn off the HV converter IC8002 28 DA 4 Direct AC Relay Shut Off Protection Circuits FROM IC2300 R6528 R6509 TO AC RELAY AC_RLY Qese7 RY6501 MBOARD pangs R6530 T Fan D BOARD Q6532 TO C6596 R6537 IC2300 R6538 CPU FBT INRUSH B OVP LOW HV OCP Ov Lov ov D6505 7 D6537 J R6605 D5007 OV K D8005 v 15V L 6522 Q V R6527 Q zE R6602 D8028 1 pso2s C6595 51V A 5 1V L nates Q8007 R6545 15V Rese3 TC8052 EC UNREG L 11V R8033 C8012 IC6505 15V i PH6501 HE E R6593 N IC8006 FBT COMPARATOR PIN 1 1 2 OO ABL R6507 135V 22N 25V R8032 FROM R802823 R8025 roses D6524 15V R8014 TO IC8002 2 gt PIN2 2 5V UNREG FEEDBACK 11V R8017 SRg015 D6532 FROM FROM in PIN 13 AN m im RY6501 Sd 15V IC8004 BUFFER FIGURE 4 2 DA 4 DIRECT AC RELAY SHUT OFF PROTECTION CIRCUITS C31P15 421517 111502 As shown in Figure 4 2 four protection circuits when triggered will turn off the AC relay directly The circuits are as follows 1 Inrush protection relay 2 B OCP 3 Low HV protection 4 FBTOCP 29 Inrush Current Relay Protection Circuit Reference Figure 4 2 The current rating of the AC relay RY65010 is 117mA at 153VAC To keep the current below 117mA resistor R6515 Inrush Current Resistor is in series with the AC input during the initial power up of the TV After the initial power up current surge R
54. l oscillator is in the Y C Jungle IC2801 1C2801 pin 4 outputs a 3Vpp rectangular waveform H DRV On the D board the H DRV waveform is amplified through Q8030 and Q8023 and then applied to T8002 pin 7 The horizontal output transistor Q8024 amplifies the signal to provide sufficient current to drive the HOT T8003 and the H DY deflection yoke At the output stage the HOT T8003 has two secondary windings that provide 15V for the Dynamic Focus Q8007 and the Horizontal Centering circuit IC8009 The waveforms shown on Figure 6 3 are the typical horizontal circuit signal shapes The difference between this set and a conventional set is the horizontal frequency which is 33 75KHz as opposed to 15 75KHz in the conventional set The 33 75KHz is considered a high definition horizontal scan rate PWM Circuit Reference Figure 6 3 The PWM circuit Q8027 has two functions First it provides a regulated 102Vdc output for the horizontal output transistor Q8024 Second it compensates for horizontal pincushion affect and keeps the picture vertical edges straight Regulator The PWM circuit regulates 135Vdc from the power supply down to 102Vdc Horizontal pulses from IC8005 pin 10 not shown in Figure 6 3 are used to drive Q8027 through IC8005pin 7 and output from IC8005 pin 3 54 The pulses are amplified and output to the HOT T5001 pin 4 To control the output voltage the horizontal output is sampled IC8005 pin 12 and used to change the p
55. low frequency chamber system The VAR FIX L R audio is output from Audio Processor 1C2501 Audio passes through buffer IC2502 and then to CN2006 pins B1 and A1 M board CN1502 pins B1 and A1 and is finally output at J1502 Speaker outputs can be viewed at CN527 pins 3 7 1 and 5 Mute transistor Q515 516 518 and 519 are activated when the MUTE or Channel buttons are pressed on the remote controller audio is mute between channels when changing channels The A MUTE line will go High and the transistor will turn ON and send the audio to ground muting the audio output 59 SONY HDTV and Memory Stick are trademarks of Sony Electronics SONY 92002 Sony Electronics Inc EMCS A Service Company 1 Sony Drive C31P15112 Park Ridge New Jersey 07656 11 15 02 Reproduction in whole or part without written permission is prohibited All rights reserved
56. mote Control Memory Stick Terminal Board Main System Control A V Processin g 3D Comb Filter 5V Reg Power Supply Unreg 7V Unreg 5V 15V 19V 4135V 433V 412V 36 5V RY6701 RY6702 Key Input LED Remote Control Memory Stick Terminal Board Main System Control A V Processin g 3D Comb Filter 5V Reg Possible Component Level Repair Possible Component Level Repair Possible Component Level Repair Possible Component Level Repair Possible Component Level Repair Board Level Repair Board Level Repair KV 40XBR800 ONLY DA 4X chassis ONLY All models and both Da 4 and DA 4X chassis Different Part for DA 4 amp DA 4X XBR models ONLY All models and both DA 4 and DA 4X chassis Different Part for DA 4 amp DA 4X All models and both DA 4 and DA 4X chassis s Same Part for both DA 4 amp DA 4X All models and both DA 4 and DA 4X chassis Different Part for DA 4 amp DA 4X Memory Stick Processor Terminal board Decoder Velocity Modulatio n Vertical Pincushio n N S Correction Memory Stick Processor Flash Focus Sensor A V Switch Terminal board DVI Decoder Velocity Modulatio n Board Level Repair Board Level Repair Board Level Repair Possible Component Level Repair Possible Component Level Repair All models and both DA 4 and DA 4X chassis s Different Part for
57. n 13 T8001 pin 13 is connected to IC8004 pin 7 and outputs a low to IC8006 pin 2 This will cause a high to be output at IC8006 pin 1 This high will cause D8028 to break over and a high will be applied to the latch circuit of Q6532 amp Q6530 and the AC relay will be shut off The TV shuts down and the Stby Timer LED flashes a 7X sequence 32 DA 4 Temperature Q5031 B OCP Vertical Deflection Protection Circuits D 20ARD AC RELAY IC2300 SYSCON RY6501 9 2 i 62 SDA were V PROT IO SDAT H PROT 167 66 dy 135V R2824 V DY Pe FEEDBACK R5104 5 R8040 CN5002 PIN 5 254105 Q5018 D8007 gy A 12V R8039 Bande 3 Q5010 R5164 Ga R8024 Y Q5009 Xp id ii R8043 Q8008 FROM 2 PIN 1 R8031 R 4 5 9 8 803 8036 ABL 15V 1 6V 75V 3VA0 23V pal C8018 R8035 GNE R5101 R5108 BUFFER ag FBT OCP E 135V R5103 9V es R5013 x uw 4135V D5001 AN R5019 R5023 D TH5002 Senos TEMPERATURE R5016 HEN ib OF Q5031 R5009 DRIVE VERTICAL R5017 DEFLECTION R5007 PROTECTION TO M BOARD HERUM Ab D BOARD IC2300 PIN 44 E C5006 R5012 B OCP FIGURE 4 4 DA 4 TEMPERATURE Q5031 B OCP VERTICAL csiPis44 1519 11 1202 DEFLECTION PROTECTION CIRCUITS Q5031 Temperature Protection Circuit Reference Figure 4 4 The temperature of the S Correction transistor Q5031 is monitored using TH5002 If the temperature of Q5031 should increase due to a defect the resistance of TH5002 will decrease and th
58. n composite outputs Waveform 5 2 can be viewed on the U board CN1502 pins B20 Sub and B23 Main Waveform 5 2 Sub and Main Video Output The Sub and Main color signal outputs can be viewed on the U board CN1502 pins A19 Sub and A22 Main reference Waveform 5 3 Waveform 5 3 Sub and Main Color Signal Output 46 Video inputs 5 and 6 are also located on the U board but are connected to IC1505 Video Switch Video inputs 5 and 6 are component inputs The component signal outputs from IC 1505 can be viewed at Cn1502 pins B17 Y A16 PB and B14 PR reference Waveforms 5 4 and 5 5 AS HH WAVEFORM 5 4 WAVEFORM 5 5 WAVEFORM Y SIGNAL 1 3Vp p H WAVEFORM P SIGNAL 1 3Vp p H WAVEFORM 5 6 WAVEFORM P SIGNAL 1 3Vp p H Note These same component signals will also be present at CN2002 pins 9 Y 12 PB 15 PR for Sub and Main video inputs and CN2002 pins 28 Y 31 PB 34 PR for the component input for signal tracing The Horizontal HS and Vertical HS Sync Input signals for both DRC and MID can be viewed at CN2002 pin 21 DRC VS CN2002 pin 18 DRC HS CN2002 pin 40 MID VS and CN2002 pin 37 MID HS Reference Waveforms 5 7 and 5 8 for VS and HS waveforms Waveform 5 7 Waveform 5 8 Horizontal Sync Vertical Sync 47 All the video signals pass through the A board unprocessed and are then applied to the B board through CN2002 A board and CN3203 B board All video processing is performed on the B
59. n normal operation 0 6V is applied to the base of Q8007 turning it ON and a Low is present at the collector A High at the collector is needed to activate the protection mode As the current in the FBT secondary increases the ABL line will increase current through the voltage divider network at the top of R8035 and less current will flow through R8035 The voltage drop across R8035 will decrease causing the combined voltage drop across R8036 and R8035 to decrease At the same time the 0 6V at the base of Q8007 is decreasing which turns OFF Q8007 and a High will be developed at the collector through pull up resistor R8022 Zener diode D8023 5 1V will break down D8005 is now forward biased and a 30 High is applied to the base of Q6532 turning it ON which then applies a Low to the base Q6530 turning it ON activating the latch Once the latch is activated the voltage at the base of Q6527 is reduced and it turns OFF removing the ground path for the AC Relay and it turns OFF The TV shuts down and the Stby Timer LED flashes a 7X sequence DA 4 Excessive HV and horizontal Deflection Protection Circuits IC8002 D BOARD HV swircHiNG 9 Q8014 FBT dh TO LOW HV PROT CONVERTER i3 Q8013 T8001 REF FIGURE 4 2 EXCESSIVE e FOR DETAIL HV PROTECTION V SENSE PH8001 SEN R8001 Bates u 4 i CD 15V C8007 LY x SS dl SD Q8003 HORIZONTAL Ry DEFLECTION D8024 A 62V LIGNE PROTECTION C8006 D8001 R8078 D8072 gt
60. ng the H drive signal to T8006 and thus stopping HV output IC8007 pin 5 can also be triggered through D8023 D8023 will be forward biased when an excessive beam current condition exists in the CRT The current in the FBT is monitored using the ABL voltage at FBT pin 11 A reference voltage is developed using the 135V and the voltage divider consisting of R8198 R8195 R8194 R8193 R8192 R8191 and R8190 The combined voltage drop across R88191 and R8190 is used to turn off Q8029 and trigger the protection circuit In normal operation 0 6V is applied to the base of Q8029 turning it ON and a Low is present at the collector A High at the collector is needed to activate the protection mode 43 C31P15 4 9 10 28 02 As the current in the FBT secondary increases the ABL line will pull increasingly more current through the voltage divider network at the top of R8190 and less current will flow through R8190 The voltage drop across R8190 will decrease causing the combined voltage drop across R8191 and R8190 to decrease At the same time the 0 6V at the base of Q8029 is decreasing which turns OFF Q8029 A High will now be developed at the collector through pull up resistor R8173 D8023 is now forward biased and a High is applied to IC8007 pin 5 A High will now be output at IC8007 pin 7 and Q8022 will turn ON and stop H drive at the emitter of Q8041 stopping the HV IC8006 pin 5 has the identical function as that of IC8007 pin 5 just described These
61. or go into IK Protection mode 15V OVP monitors the 15V line for excessive voltage condition IC6502 is used to monitor both 135V OVP and OCP conditions Q528 on the A board If AC is not present at the input to the Standby 5V circuit Q528 will activate the Latch and shut down the TV IC8005 and Q8044 monitor the horizontal deflection operation IC8003 and V DY IC8003 is the vertical drive IC that drives the deflection yoke DY The low side of the deflection yoke is monitored for proper vertical operation IC8006 and IC8007 monitor three separate circuits Low HV Excessive HV and FBT OCP 38 DA 4 Direct AC Relay Shut Off Protection Circuits TO AC RELAY R6525 D6524 RY6701 FROM IC2300 gt K Q6503 AC RELAY Eie P R6523 Snes Q6502 a Q6504 C6575 R6528 fee INRUSH 415 OVP B OCP B OVP AC PROT C658175 R6538 A y D6505 TO R6539 SYSCON E L5 CN6505 ER N6505 12V 415V IC2300 FROM Tzoej CN901 i OO PIN 8 X D528 i PH6002 5 1V p A Re536 R D529 Q528 i 1t 2 3 On R634 11V JN ome R6516 i BE C572 u D MEE REF E at 706518 as SV 2 Sain I us A BOARD T6703 N n R6519 47V 4 hot Rr En i lt 12V C6553 S R6520 G BOARD R6506 FROM AC RELAY y TO AC RECT RY6701 D6702 FIGURE 4 7 DA 4X DIRECT AC RELAY SHUT OFF PROTECTION CIRCUIT csisaz 5 111502 Inrush Current Relay Protection Circuit Reference Figure 4 7 The current rating of the AC relay RY6701 is 117mA at 153VAC
62. or when the particular protection circuit is triggered e g 4X will occur with a vertical deflection failure Each protection circuit will be discussed in greater detail in coming diagrams The purpose for each protection circuit is indicated by the name of the particular block 27 The important thing to note on this diagram is the protection circuits that have a direct connection to the CPU and those that do not The protection circuits that have a direct connection will produce a more reliable flash sequence e g 2X 3X 4X and 6X The circuits that do not have a direct connection may produce a 7X or 6X flash sequence TH5002 is used to monitor the temperature of Q5031 S Correction Output If this transistor should become a short circuit the current will increase which causes an increase in temperature TH5002 detects the rise in temperature the Video is muted and AC input is disconnected through IC2801 CRT Drive and data communications with IC2300 Syscon Q5004 monitors the current draw on the 135V line If the current should increase video is muted via IC2801 and IC2300 Also note that there is a direct connection from the B OCP circuit and IC2300 Syscon for quick disconnection of AC input Q8008 monitors the current in the secondary of the FBT using the ABL voltage If excessive current flows in the FBT Q8008 is used to mute the video Q8008 works simultaneously with Q8007 which turns off the AC relay IC5004 is the vertical de
63. pplied to the base of Q5004 through D5005 Once the voltage drop across R5013 is large enough to cause a 0 6V difference across Q5004 base emitter junction Q5004 turns ON Current now flows through the voltage divider consisting of R5009 R5011 and R5012 The voltage drop across R5012 is applied to 1C5007 pin 8 causing 1C5007 pin 8 to become more positive then the reference voltage at IC5007 pin 9 3V The output IC5007 pin 14 will go Low and turn Q5018 OFF A High through pull up resistor R5104 is now applied to IC2801 pin 57 H Prot through forward biased D5006 IC2801 will mute the video and communicate via IC2801 pin 52 with IC2300 pin 31 to shut off the AC relay at IC2300 pin 69 The TV video is muted the AC relay shuts down and the Stby Timer LED flashes a 2X sequence FBT Over Current Protection Circuit IK Prot 1 Reference Figure 4 4 The secondary current in FBT is monitored by Q8008 at FBT pin 1 ABL The 135V is used as the reference voltage through the resistor voltage divider consisting of R8040 R8039 R8038 R8037 and R8043 The combined voltage drop across R8036 and R8035 is used to turn off Q8008 and trigger the protection circuit In normal operation 0 6V is applied to the base of Q8008 turning it ON and a Low is present at the collector A High at the collector is needed to activate the protection mode As the current in the FBT secondary increases the ABL line will increase current through the voltage divider network
64. ppropriate ICs Once the ICs receive this data to set their operating parameters the TV can function The data on both bus networks is always present as long as the TV is ON The data signals can viewed at CN525 pins 20 and 18 SDAT and SCLK and CN525 pins 14 and 12 BDAT and BCLK The digital signal for all four data looks the same when probing with an oscilloscope 5Vpp digital signal Reference Waveform 7 1 for the oscilloscope display waveform Waveform 7 1 SDAT SCLK BDAT BCLK Communications bus network DO CO is only used between the three MID ICs IC3090 MID Micro IC3400 MID IC and IC3089 NVM MID Micro IC3090 communicates with MID IC3400 to retrieve processed data such as the input horizontal frequency and uses it to select video signal paths MID Micro IC3090 also communicates with memory IC3089 to set up the multi picture parameters 57 Chapter 8 DA 4 amp DA 4X Audio Circuits DA 4 and DA 4X Audio Block Diagram FROM HB J1501 BOARD J1501 J1501 J1501 CN2006 CN2006 J1509 J1508 A1LR A2LR A3LR A4LR A7LR TUILR TU2LR ASLR A6LR Y MONITOR IC1502 MAIN AUDIO L R AV SWITCH AUDIO L R AUDIO OUT J1502 VAR FIX LR _ ON1502 pasfazs sgs a Es ao Bt a CN2oog Bele amp Bsjas Bs as Bi At MONITOR OUT E o RS MAIN AUDIO L R AMUTE FROM IC2300 TED See eR M BOARD 24V TO SPEAKERS amp WOOFER FIGURE 8 1 DA 4 AN
65. rd DA 4X are used to develop other regulated voltages The unreg 7V is used to develop reg 5V through 1C504 unreg 5V is used to develop 3 3V through 1C502 unreg 11V is used to develop reg 9V through IC505 Also note that in the DA 4X chassis the unreg 7V is used to develop a separate reg 5V on the D board In both the DA 4 and DA 4X chassis the reg 15V is used to develop regulated 12V 26 Chapter 4 DA 4 amp DA 4X Protection Circuits DA 4 Protection Circuits SYSCON IC2300 AC RELAY DATA zi RY6501 CRT DRIVE j IC2801 i Overall Block Diagram AC RELAY CHASSIS TEMPERATURE PROTECTION TH5002 7X FBT OCP VIDEO MUTE al Q8008 ROUEN eA PPOP O VERTICAL RELAY ri IC6505 P in DEFLECTION RY6502 PROTECTION 6x A zn IC5004 MS A BOARD HV POWER SUPPLY IC8002 LOW B 5V PROTECTION IC504 Q527 HORIZONTAL EXCESSIVE HV PROTECTION DEFLECTION IC8001 i l l PROTECTION IC8006 IK WHITE BAL PROTECTION 1C9001 IC9002 l HOT l l IC9003 IK PROT l GROUND SECTION CH CX BD FIGURE 4 1 DA 4 PROTECTION CIRCUITS OVERALL BLOCK PRESS SUE Figure 4 1 is a basic block diagram illustrating the interconnection of the protection circuit System control and the AC relay Also shown on the diagram is the Standby Timer LED flash sequence f
66. rnal circuits and begin oscillations Note that the 279Vdc from R6702 is connected directly to the Drain of Q6701 and serves as the High side FET power source Internal circuits initially power by IC6501 pin 18 e Internal drive transistors for High side output FET Q6701 e Oscillator e Control circuit e 10V regulator IC6701 pin 10 Note The 10V output at IC6701 pin 10 passes through D6712 and supplies power to the internal driver transistor for the Low side output FET Q6702 3 Output Oscillations At this point initial square wave oscillations of approximately 125KHz are output at 1C6701 pins 16 and 12 Normal operation frequency is approximately 85KHz 4 Regulator Feedback The feedback line is connected to the 135V secondary output Once IC6701 is turned ON and oscillations begin the secondary winding at T6703 pin 11 and associated circuitry produces 135 The 135V is applied to IC6503 pin 1 DM 58 Control IC6503 controls the voltage at the PH6001 pin 2 which controls the current output of the optic coupler PH6001 The amount of current supplied to 16701 pin 2 depends on how hard PH6001 is turned ON In normal operation a voltage of 1 9Vdc which is proportional to the amount of current is present at IC6701 pin 2 The feedback loop is now complete 5 IC6701 normal operating power supply VC1 Produced simultaneously with the oscillator feedback is the operating power source VC1 IC6701 pin 8 VC1 is produced using a winding on T6703 pin 4
67. rter IC OFF Drive to the FBT will stop and HV will not be developed The TV shuts down and the Stby Timer LED flashes a 6X sequence Horizontal Deflection Protection Reference Figure 4 3 A sample of the Horizontal drive pulse is taken off the top of C5060 The pulse at this point is amplitude limited using D5018 to 15V The sample pulse is first buffer by Q5021 and then applied to comparator IC8006 pin 5 through D8140 Approximately 7 4V is developed at IC8006 pin 5 making it more positive then the reference voltage on IC8006 pin 6 4 5V This condition causes a High 15V to be produced at the output of the comparator IC8006 pin7 The 15V from IC8006 pin 7 is applied to the cathode side of the LED PH8001 pin 2 and 15V is also applied to the anode side of the LED PH8001 pin 1 So the LED is OFF and the collector emitter junction at PH8001 pins 4 and 3 is open 2 4V is present at PH8001 pin 4 If the horizontal drive to the deflection yoke possible defective Q5030 were to cease there would be no sample pulse applied to IC8006 pin 5 and IC8006 pin 5 will go to OV This condition will cause IC8006 pin 7 to go Low This Low is applied to the cathode of the LED PH8001 pin 2 the LED turns ON and the collector emitter junction PH8001 pins 3 and 4 conduct applying ground to IC8002 pin 1 V Sense This turns the HV power supply converter IC8002 OFF and no drive to the FBT HV output stops With no drive to T8001 there will be no output on T8001 pi
68. t Images in directories that were modified or renamed on a computer Images with less than 16 horizontal and or vertical dots per line VV VV V Images with more than 4096 horizontal and or vertical dots per line Memory Stick Interface and Processing Block MEMORY STICK HM BOARD m DIR ME SCLK p n MS SDI MISS IN MS D MS SCLK MS SD MS1 BOARD MS DECODER BOARD FIGURE 2 5 MEMORY STICK INTERFACE amp PROCESSING BLOCK C31P15 2 5 1502 11 7 02 The Memory Stick MS is inserted into CN7201 on the HM Board Once the MS is completely seated in the slot the Memory Stick applies a ground to CN7202 pin 15 MS INS which goes Low from 3 3V to OV This notifies the MS1 Board that a MS has been inserted Initial data will be transferred at this time between the HM Board and MS1 Board and can be viewed at CN7202 pins 5 through 14 reference Waveforms 2 1 and 2 2 The data signals are all in differential format with a positive and negative signal The differential format is incorporated to eliminate noise on the data lines Data can be viewed on these pins when the MS is initially inserted and when an image is selected for display on the CRT 10 2 New Features DA 4 Chassis CH2 oa aa Waveform 2 1 Waveform 2 2 MS SDI MS SDI The MS INS is applied to the B Board pin B3 and forwarded on to the MS1 Board The MS Data signals are amplified on the HM Board and then applied to the B Board pins A4 B4 through
69. the service mode by varying the parabola waveform at CN8025 pin 6 HC PARA which is processed on the AD Board which produces the H CENT signal at CN8027 pin 7 The H CENT is applied to IC8009 pin 1 and a dc offsets is produced at IC8009 pin 4 through PS8005 DA 4X Vertical Deflection Circuit 15V 15V IC8003 500mVpp V DRIVER NV se ee VD PB VOUT l l o iO olo N IC2801 SID S S LG Omo Y C JUNGLE O19 O R8013 R8014 R8018 15V l l i I R8147 R8041 R8032 mE 54Vpp a cr iai dinem c MCN DE i I V PROT FRED FE SEERE SER ES EGE CM CM CUT QN FIGURE 6 4 DA 4X VERTICAL DEFLECTION CIRCUIT C31P15 6 4 10 7 02 Vertical Drive Reference Figure 6 4 The vertical oscillator inside IC2801 starts and outputs ramp signals at IC2801 pin 18 VD and IC2801 pin 19 VD when power is applied Data need not be present for vertical drive to output from IC2801 The vertical stage has not changed functionally from previous models The vertical drive signals from 1C2801 pins 18 and 19 are applied to IC8003 pins 1 and 7 The ramp signals are amplified in IC8003 and the output drive for the V DY is output at IC8003 pin 5 55 Chapter 7 DA 4 amp DA 4X Data Communication Bus Networks There are three data communications networks used in the DA 4 and DA 4X chassis s All three consist of data and clock lines which communicate with multiple ICs Refer to Table 7 1 Table 7 1 Data Communications Bus N
70. turn ON Once the secondary voltage UNREG 11V is developed on T6703 in the Main Power Supply it is fed back to the Inrush Relay RY6702 RY6702 turns on and bypasses R6705 in the ON mode R6705 is only in the circuit during initial power up of the set Troubleshooting Tip Obviously if a failure occurs in the 5V Standby Power Supply the unit will not even attempt to turn ON If this condition occurs check the following components 1 FH501 13V at IC501 Input Pin 1 If missing suspect T502 D503 and or C507 3 5V at IC501 Output Pin O If missing suspect a defective IC501 NOTE Q503 is used as a current source for the AC relay RY6701 If the collector emitter junction of Q503 becomes an Open circuit the set will still turn ON using voltage through D509 and function properly with sufficient AC power input If the AC power input is weak Low Voltage 90VAC the unit will have difficulty turning ON without Q503 functioning properly 22 DA 4X Main Switching Power Supply Circuit LIT ABOARD CN6701 10 CNS14 i i R6702 FROM ANA oo 2 MCZ vs 18 275Vp p T 6315 PS6503 3001D c LI 78kHz t t IN ERI 19V 5 PS6504 3 A R6728 C6711 A i e a 19V bw E ia UNREG l a 11V QD a D6534 Y PS6505 OR mmm l D6535 FL o dd ov i 5 A D6537 28 R6730 i i Sex TON 18V 16715 pere ia G BOARD E Esso Lu ele Eva T C6724 T TCc6727 3 i D6518 PS6507 Ls D6514 Y IN
71. ugh the service mode by varying the parabola waveform at CN5001 pin 10 MP PARA 52 DA 4 Vertical Deflection Circuit IC5004 V V DRIVE V OUT CENE EE 1 VD FB PCS BOOST VD IC2801 Y C JUNGLE VD VD _ SSS ne 1 7Vp p FIGURE 6 2 DA 4 VERTICAL DEFLECTION CIRCUIT C31P15 6 2 1528 11 8 02 Vertical Drive The vertical oscillator inside IC2801 starts and outputs ramp signals at IC2801 pin 18 VD and IC2801 pin 19 VD when power is applied Data need not be present for vertical drive to output from IC2801 The vertical stage is has not changed functionally from previous models The vertical drive signals from IC2801 pins 18 and 19 are applied to IC5004 pins 1 and 7 The ramp signals are amplified in IC5004 and the output drive for the V DY is output at IC5004 pin 5 53 DA 4X Horizontal Deflection Circuit E Bomo D 1kVp p 5V mow d go FEE ee cand Q8039 1 i PS8005 3H DY B m q HDT HCENT X OH 78008 T 135V sai 6 3 5V H DY R L8016 Q8027 4 eum EN o C8135 C8093 T oi i K 5V lt C8122 R8211 78137 H DY G 6 gt FROM IC8005 PIN3 E D8045 PWM amp PINCUSHION 77 7 FIGURE 6 3 DA 4X HORIZONTAL DEFLECTION C31P15 6 31529 11 8 02 Horizontal Drive Circuit Reference Figure 6 3 The circuit is split between an oscillator on the B board and an output stage on the D board The 33 75KHz horizonta
72. ulse width of the H drive pulses These changes regulate the output voltage to 102Vdc at T5001 pin 4 Pincushion Correction If the PWM output voltage at T5001 pin 4 were changed the horizontal picture size would vary accordingly A vertical pincushion signal is produced at IC2801 pin 11 not shown and is applied to the PWM circuit to increase the picture width and compensate for the pincushion distortion The EW PARA parabola signal form CN8025 pin 9 is first applied to IC8005 pin 6 which is used to drive the gate of Q8027 The parabola signal at IC8025 pin 6 is compared to the H DRV feedback waveform at IC8025 pin 7 This comparison causes the PWM signal at the output IC8025 pin 3 to vary in pulse width The change in pulse width causes more or less voltage to be applied to the horizontal output Q5030 collector during the vertical scan down the CRT This varying voltage causes a varying current to be applied to the H DY Current is gradually increased as the beam scans down until the current is at its maximum at the center of the CRT where the pincushion distortion is the most extreme The result is a straight line linear scan down both sides of the CRT H Centering Correction Also shown in Figure 6 3 is the H Centering circuit This circuit applies a small positive and negative dc offset to the Red and Blue H DY respectively to keep the picture centered with reference to the Green H DY on the CRT This function is performed dynamically through

Direct View/Projection Television Troubleshooting

Contents

Download Pdf Manuals

Related Search

Related Contents