sony_wega_training_aa-2w_chassis2015-05
Contents
1. R526 100V 5ms ABL FROM 1503 11 TO Q504 NECK E W Ba PROTECT FROM IC355 11 4135V R540 R515 C520 R506 FROM C510 ge MAIN HP L C521 C519 A a Bun D536 D535 R523 TO H AH D515 511 OUT R524 C522 C525 DWG cs29 R517 gt R525 R516 NJ pores L 6 0 4 R519 0512 MV D516 PIN PIN IC501 DRIVE R528 I C530 4 9 C526 D518 12V Bess V 15V 15V B 135V MTZJ T 7736 D524 DOT 0529 MTZJ T 77 6 8 PINCUSHION 12CTV26 1 1 00 36 H Protect Overvievv The H protect circuit is used to shut down the horizontal deflection circuit if the high voltage should rise above the acceptable level or if the pincush ion drive circuit Pulses from the flyback transformer s heater winding are compared against a reference voltage The reference voltage can be removed based on the condition of the Pin Out circuit Loss of Pin Out will cause horizontal protection to be indicated When H protect is detected HP pulses will be removed from IC355 19 HP Hoff Video and HV will be disabled but the power supply will continue to function Circuit Description When the horizontal circuit is operating normally a signal is output from T503 5 that is used to supply voltage to the filaments of the tube At this point R550 R529 C531 and C532 filter the signal to a DC voltage This DC voltage is input to IC501 3 non inv2. One significant difference between the 27FV15 model and the rest of the models is the lack of the component input This model will have a much simpler video path because of this 3D Digital Comb Filter analyzes the picture along the three dimensions of height width and time to minimize even subtle picture artifacts 3 Line Digital Comb Filter analyzes three TV scanning lines at a time for better color Vertical Aperture Compensation sharpens picture definition and edge detail on the vertical plane producing sharp horizontal edges Steady Sound Automatic Volume Control with BBE equalizes the volume levels so there is consistency between programs and commer cials Auto SRS Sound Enhancement creates a vivid stereo image using the principles of human hearing to make the sound appear to come from widely separated speakers Magnetic Quadra Pole reduces beam spot distortion and improves cor ner to corner focus as well as picture sharpness Board Descriptions Description Micon Y C Jungle Tuner Pincushion H Deflection V Deflection H Deflection Syston Audio Amp Surround Sound Sub tuner S Link RGB Drive Power Supply Front A V Inputs Menu Buttons IR Detector Buttons T XBR Only IR Headphones UX XBR Only 3D Comb Filter A V Switch Audio Control SRS Chroma Decode PIP Encode UY All Except XBR 3 Line Comb Filter A V Switch Audio Control SRS Chroma Decode
3. 1 452 094 00 to the bell of the picture tube is the only way to compensate for lost magnetic conditioning The Sony manual degaussing tool can be used to degauss P N 7 700 781 01 RGB RAINBOW UNREPAIRABLE V Chip Introduction Pursuant to the Commission s rules half of all new television models 13 inches or larger manufactured after July 1 1999 and all sets 13 inches or larger manufactured after January 1 2000 must have V Chip technology Set top boxes that allow consumers to use V Chip technology on their existing sets are now available This quote from the FCC web page defines the guidelines that manufacturers of television receivers must fol low No matter what your personal feelings on the ratings issue you will be forced to deal with it as a technician Here you will be given informa tion on what V chip technology is how it is implemented in Sony televi sions and what to do if the customer forgets their password Broadcasters are not required at this time to transmit ratings for their pro gramming At this time however the major networks are broadcasting ratings but all of their affiliates are not In addition many of the popular cable stations are broadcasting V Chip ratings What is V Chip Technology The V Chip system allows broadcasters to send data that contains rat ings The television receiver processes this data and acts according to the programming wishes of the user The users televisi
4. 1 V 10 us Regulation Changing the frequency of the switching regulates the output voltage at the secondary winding comprised of T621 8 and 9 Taking a sample volt age from 1621 4 and applying it to rectifiers D624 and D625 does this As this voltage rises and falls the rectified voltage is applied to Q622 B through R634 When Q622 begins to conduct it lowers the voltage at Q621 G and changes the switching frequency The changing frequency will change the amount of voltage coupled to the secondary winding consisting of T621 8 and 9 If the load on the second ary output increases the frequency of switching will decrease This brings the frequency of the converter closer to the optimum operating frequency of T621 SRT Moving closer to this optimum frequency causes more voltage to be provided at 1621 9 The opposite occurs when the load on the supply decreases This causes the frequency of operation to be in creased and the amount of voltage coupled to T621 9 to be decreased The supply typically operates at 45 KHz when the set is OFF and at about 30 kHz when the set is operating The incoming line voltage also effects the frequency of switching operation D621 4 7 OHMS SHH D622 R640 C631 FROM T601 1 AC Hi SIDE A D623 R631 Q621 D698 A 2SK2845 ali C629 FROM R637 R623 amp R664 AC Lo SIDE C630 R632 A D699 MTZ T 77 1 D624 V D625 R633 C633 R634 DI D626 R638 RD6 2ESB2 C635 STANDBY SUP
5. PIP Encode except FS10 model WA Velocity Modulation Quadrapole F XBR only XBR Non XBR CIRCUIT BOARDS LOCATION Picture Tube Defect Symptoms Overvievv Below is an excerpt from the CTV 25 course It shows several picture tube defect symptoms some of which can be repaired without changing the tube Dark picture or one color missing Dark picture Bright red green or blue picture One color retrace lines may be present Retrace lines are diagonal lines that run from lower left to the upper right corner Defective Picture Tube Symptoms Heaters Open Grid 1 to Grid 2 short Heater Cathode short OR Cathode to Grid 1 short Apply 6Vdc to the heater terminals Some heaters are connected in parallel others in series but all take 6Vdc There should be infinite resistance between the G1 and G2 pins Remove the R GorB video input to the CRT for the bright color If that color is still bright the tube is bad There should be infinite resistance between any CRT pin to either Heater Clean the CRT pins and examine the socket for corrosion Apply 6Vdc to the CRT heater pins looking fora glow in all three heaters Then if a heater s does not glow replace the picture tube Unplug TV and remove C board Apply 15 20Vdc between the G1 and G2 pins to vaporize the short Current limit the power supply to 1 Amp Replace tube Grid 2 to high v
6. R524 The signal is applied to a clamp that consists of D518 D523 and D524 Itis also applied to R525 and D516 This signal is now stripped of its negative component and integrated by C530 This signal is then ap plied to IC501 5 non inverting input IC501 Pin Control compares the inverting and non inverting inputs and outputs their difference The result is output at IC501 7 INN IC501 6 2V 5ms IC501 5 5V 20us IC501 7 5V 5ms 35 This signal is then applied to the base of Q511 Pin Out The signal is inverted by Q511 and then input to the base of Q512 The result is that a PWM waveform is seen at Q512 C Q512 C is connected to the return for the horizontal output When Q512 Pin Out is conducting it allows more current to be drawn by the horizontal yoke The conduction of Q512 is set up so that more current is drawn during the middle edges of the scanning of a horizontal line The result is shown where the output leaves this circuit at R526 The H Protect circuit will remove the horizontal drive signal if the HP pulses are not input to IC501 5 This will also occur if Q511 or Q512 short Q512 B 2V 5ms
7. click Power relay IK lines visible OK Normal OK Unit shuts off WA board problem OSD expanded normally or Q301 or IC353 on almost off screen A Board 2 clicks Power Relay None None Blinking None Both relays turn Regulators on A and Degauss relay OFF and Timer LED board Degauss relay never stops blinking turns OFF Audio Normal Normal None Normal Normal Normal PS1461 AK Board B 2 clicks very close None None Blinking None No relay click but IC1761 CRT Amp together Power Only Timer LED stops Disconnect CN1764 blinking to verify 3 clicks 2 Normal but None None Blinking None No clicks IC561 Vertical then an extra click Output Check indicating shutdown R537 2 clicks Power and None None Blinking Starts to come 2 clicks when set is IC561 Vertical Degauss up but stops turned OFF Output Check after 2 click R536 Converter 1 click Power Relay None None Blinking 1 click Power Relay IC601 and or R607 not only only switching May cause the IC601 Converter to fail May cause shutdown similar to 135 if fuse doesn t blow 24 Power Supply Protection Overview There are three different circuits that can activate the protection latch One is the OCP Over Current Protection for the 135 volt line The other two are related to the voltage from T605 3 Foldback Winding When one of these circuits activates the latch RY600 is turned OFF This discon nects the AC from the circuit t
8. coils since no more current is flowing through them The set will not degauss properly if the set is turned OFF and ON again quickly You typically need to wait at least a few minutes until the thermistors have cooled to degauss again If the degaussing circuit is not operating no hum will be heard when the set is turned ON It is also likely that purity problems will occur since the tube could become magnetized Room vibrations may cause the contacts of RY601 to make contact when they are not supposed to causing the degauss coils to be activated while the set is producing a picture If this occurs the customer may complain about an intermittent rainbow pattern or intermittent loss of purity Ifa customer complains about this try replacing RY601 IC622 BAOST STANDBY STANDBY R603 C603 DOWER TE 5V SUPPLY CN602 D SE m CN603 F601 C605 IVDR601 0 1 VDR602 ER 6 3A VA VA gt A TO R62 C607 625 CONVERTER A D630 CN601 C606 Goa le A THP601 O HPSEL m kal K IC An UE gt gt 12V TO 001 33 212 TANDBY CN1641 12 k de Q646 B A BD R641 ad R626 D614 gt Q647 B O RELAY A K SOFT START FROM C624 R622 Q648 RESET IC001 62 VIA paz CN1641 11 FROM A BD Q642 E G BOARD Dear G BOARD POWER ON DEGAUSSING 4CTV26 1188 12 28 99 14 Converter Overvievv The function of the converter is to switch the Converter B voltage through a transformer s primary winding This switching will pro
9. doubler is approxi mately 310 VDC This voltage will be referred to as Converter B Con verter B is applied to the converter circuit through R607 R607 isa fusible resistor If the converter circuit draws too much current it will open When RY600 Power Relay is closed a click is heard When the Converter B is applied to the converter circuit it will begin to operate and supply power to the rest of the set 13 Degaussing When the set is turned ON a click is heard from the Power Relay RY600 About one second later another click is heard from RY601 Degauss Re lay After this a loud hum can be heard This indicates that the degauss ing circuit is operating The degaussing circuit operates because every time the set is turned ON a HIGH is output from IC001 33 Tuning Micon O HP SEL This HIGH is applied via the cable between CN1641 on the A board and CN641 on the G board This voltage is used to turn ON Q644 When Q644 is turned ON RY601 is energized causing current to flow from the AC line through THP601 and THP602 When current flows 120VAC is applied to the degaussing coils When this occurs a hum can be heard THP601 and THP602 are thermistors whose resistance increases as they get warmer The thermistors should read less than 10 ohms when cold The current flowing through them when voltage is applied to the degauss ing coils is great and causes the thermistors to open after a few seconds This stops the action of the degaussing
10. is used in conjunction with the latch to switch the Power ON line LOW if a failure should occur This will turn RY600 Power Relay OFF and turn the power supply OFF In addition to this protection circuit a foldback circuit can also shut down the power supply The foldback circuit compares the secondary s 12 volt output to a volt age on the primary side If there is a problem with either one of these circuits the set will shut down CONVERTER na AC 7 ET PUE L RECT SECONDARY 2 RY600 SUPPLIES 6 TO CN1641 A BOARD DEGAUSSING RY601 SOFT START FOLDBACK DGC REGULATION E rj CN641 G BOARD PROTECTION amp LATCH CN642 5V AUDIO B AUDIOB ro EM gt CN1643 AUDIO GNDE AK STANDBY eee BOARD POWER Ms SUPPLY POVVER SUPPLY BLOCR 7CTV26 1 1 00 Standby Power Supply Overview The standby power supply is a switching power supply used to create Standby 5V The Standby 5V line is used to power the Tuning Micon and EEPROM and any other circuits which need power when the set is OFF Converter Operation Operation of the Standby power supply begins when the set is plugged in The AC line voltage is applied across the standby power supply The AC low side is ground for this circuit The AC high side is applied to a half wave rectifier consisting of D621 and D622 Two diodes are used so that there will be protection should one of them fail This voltage is then ap plied to T621 1 SRT Input through R639 R639 Is a fu
11. relay is turned OFF You can check the voltages around IC601 to troubleshoot this problem There would be no voltages present since R607 would be open due to the shorted transistor You should always check the horizontal output for shorts when the con verter transistor has failed It is also a good idea to unload the power supply and bring the line voltage up slow using a variac AA2W Chassis Power Supply Output Voltages Primar Hot Ground 17 When performing this procedure set your variac to zero Jump the relay contacts Warning By jumping the relay contacts you have defeated the protection circuitry of the power supply Plug the unit into the variac and bring the AC voltage to 30 VAC You should have stable oscil lation at this point Check to see how much current is being drawn from the AC line The current drawn should be minimal since the supply is unloaded Check the voltages at the points in the table below The oscil lator voltage and frequency are measured at T603 2 The secondary voltages can be easily checked at CN641 and CN642 Increase the line voltage by ten volts and check each item in the table again Repeat this procedure at 50 and 60 VAC Warning It is not recommended that the power supply be operated unloaded above 60VAC Another problem that may occur is that the switching never starts To troubleshoot this type of problem remove one lead from C615 When you power the set ON you should have a DC voltage of half t
12. 1 X 9V REG L652 O a TO A J v C665 D647 V C647 A D642 A G BOARD m R670 NOT USED D641 7 C644 33 VOLTS TO AU SAK BD lt SR 84 CN 1463 E S R643 AU CN642 SECONDARY SUPPLIES 6CTV26 1190 122299 22 Flyback Secondary Voltages Distribution The following voltages are scan derived This means that some windings of the flyback transformer have their signals rectified to create additional power supply lines 200 Volts C Board IC1701 CRT Amp 12 Volts A Board IC501 Pin Control IC561 V Out u 15 Volts IC501 Pin Control 1C561 V Out Q511 Pin Drive WA Board IC961 N S Amp The scan derived supplies are developed when the output from Q502 H Out is input to T503 Flyback Transformer This signal is used to create the boosted B 200 on the primary side and the 12 and 15 volts on the secondary side The signal from T503 4 is sent through R553 and rectified by D534 This voltage is output from CN503 5 on the A board to CN503 on the C board This voltage is used to supply IC 1761 CRT Amp on the C board This connector can be disconnected to check to see if the problem is with IC1761 CRT Amp EAGT OF T503 FLYBACK FROM Q502 C H OUT B 23 As 15 R536 D530 The 12 volt line is derived from the signal at T503 9 It is sent through R537 and rectified by D531 In the event that a short occurs on this line R537 may open Since the vertical output is supplied by this line R537 should alwa
13. 1096 TO D612 A q AA CONVERTER REGULATION 13A FROM mej TO SOFT START RESET R665 Q647 B 1CTV26 1185 3 22 00 POVVER SUPPLY PROTECTION 26 Vertical Deflection The vertical deflection stage consists of the Vertical oscillator Vertical amplifier Flyback generator and the Deflection yoke The purpose of this stage is to manufacture a magnetic field The magnetic field will bring the electron beam gradually from top to bottom vertically and then quickly back to the top beam retrace of the screen to start over again Vertical Oscillator When the TV is turned ON Set 9Vdc appears at Y C Jungle IC301 33 and 44 The internal horizontal oscillator begins and is counted down divided to 60 Hz to become the vertical drive signal The drive signal is formed into a positive and negative ramp and its amplitude and linearity are determined by the serial data from IC001 Tuning Micon If the data or clock signal at IC355 34 and 35 were missing there would be NO vertical drive at IC301 13 and 14 Vertical Amplifier IC561 Vertical Output is a single package vertical amplifier that outputs a waveform with sufficient amplitude and current to drive the deflection yoke It is powered by 12 and 15 volts from the flyback transformer secondary Flyback Boost Generator The vertical boost signal is used to generate extra current in the deflec tion yoke during the retrace period This extra current is used to quickly return the elec
14. 36FS10 KV 36FV15 KV 36XBR200 KV 36XBR250 Subject Part Number for TLH Plate Date October 7 1999 Symptom XXXX Need the part number for the TLH plate which slides into the Yoke Solution If a yoke needs replacement the TLH plate should be removed from the old yoke and inserted into the new yoke If the TLH Plate was lost or misplaced the TLH plate part number is listed below AA 2H AA2 W TLH Plate Gray 2 163 920 11 BA 4C KV 24FV10 TLH Plate White 4 057 714 01 NOTE The two TLH Plates are not interchangeable The TLH plate can be inserted into either the left or right side of the Yoke There is only one plate therefore during alignment the plate must be tried in both sides of the Yoke to determine the most effective adjustment position The alignment procedure for the Yoke replacement can be found in Service Bulletin 387R2 TE TLV gt A s O Ban TLH Plate Fr SN A 74 RE R A TLH Plate VY ds Board Slot right side THL LA 2 slot left side NA TAS Bo L H 1 9002 Reference FPR U0898 PRINTED IN USA SONY CONFIDENTIAL Sony Service Compan Mad Technical Sonae Se VI Ce B U leti N A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 32XBR250 KV 36XBR250 No 432 Subject Headphone Part Number Missing Date November 4 1999 Symptom XXXX The part number for the Headphone MDR IF0230 is not listed in the Service Manual So
15. 522 R531 1 C532 CN503 1 i CN1103 ER TO C CHECK BOARD CONNECTOR CN1764 H PROTECT 38 13CTV26 1195 1 4 00 SONY CONFIDENTIAL Sony Service Company gt National Technical Services Se Vice B U etl n A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 27FV15 No 41 2 Subject Part Number Correction Date October 1 1999 Reference No 4 A Board Symptom XXXX The part number listed on page 66 of the Service Manual for Ref 4 A Board is incorrect Solution Please note the correct part number as shown below DESCRIPTION PART NUMBER INCORRECT CORRECT A BOARD A 1298 866 A A 1298 886 A The part number is listed correctly on page 69 Reference FPR U0879 PRINTED IN USA SONY CONFIDENTIAL cs Sony Service Compan National aa Se rvice B U leti N A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model RV 36FS10 KV 36FV15 KV 36XBR250 SU 36FD2 No 415 Subject Glass Stand Door rubbing on bottom of Date October 1 1999 cabinet Symptom 161X Glass doors of the SU 36FD2 stand rubbing on bottom board Glass door scraping off vinyl on bottom board and bowing of bottom board when unit is positioned on high pile carpet Solution If the customer should complain of the symptoms above please do the following Service Part Kit 4 074 400 01 1 Order the Service Part Kit See Fig 1 SERVICE PARTS ES KIT IN
16. 559 and TH501 which are in series The thermistor is used for temperature compensation As the vertical yoke draws more current the resistance of TH501 lowers allowing more current to flow to the yokes The voltage developed across these resistors is fed back to the inverting input of IC561 1 through R566 to improve linearity ES IN IC355 13 1V 5ms IC355 14 1V 5ms IC561 5 20V 5ms IC561 3 20V 5ms Q562 B 5V 5ms CN501 5 1V 5ms x D388 MIZJ11B 412V SCAN D561 C565 DERIVED SAN gt Si SUPPLY R537 D531 12V CN1942 FROM T503 8 TOWA BOARD CN942 Q561 9V i TO IC355 15 SCL VM OUT SDA V PROTECT FLYBACK R569 GENERATOR N S AE q R384 nes O a E R387 R561 IC355 CXA2131S L D384 R567 C568 R585 Y CN MTZJ11B sr R559 2 VTIM R563 R578 I TH501 15V SCAN z DERIVED MAIN SUPPLY R536 D530 A BOARD VP FROM T503 7 VERTICAL DEFLECTION 10CTV26 1194 1 4 00 28 Relay Clicks Video Timer LED HV Power Switch OFF Open Two clicks None Normal Flashing Normal Two clicks Yoke Degauss never turns P
17. 6FV15 KV 32XBR250 KV 36XBR250 Subject V Bow and H Trap Adjustments Date October 7 1999 Symptom XXXX V Bovv and H Trap Adjustments are missing from the Service Manual Solution If the customer complains of poor geometry trapezoidal or bowing the following adjustments might be needed V Bow Geometry distortion like the picture in Fig 1 can be readjusted by using the Y Magnets The Y Magnet is located on the Neck Assembly CRT side See Fig 3 Y Magnets located on the Neck Assembly A djust the taps simultaneously to achieve the best geometry After adjusting this magnet please confirm the over all geometry again V Trap etc could also affect the geometry as well Reference Tomohiro Mori PRINTED IN USA Adjust the taps simultaneously to achieve the best geometry After adjusting this magnet please confirm the over all geometry again V Trap etc could also affect the geometry as well H Trap Distortion If H Trapezoid geometry is present you can adjust the H trap RV941 on the WA Board See Fig 4 After adjusting check the overall geometry again since V Bow can also affect the Trapezoid distortion H Trap WA Board RV941 HA INA SONY CONFIDENTIAL cr Sony Service Compan Mad Technical Sonae Service Bulletin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 24FV10 KV 27FV15 KV 32FV1 KV 32FS10 N 425 KV 32FV15 KV 32XBR200 KV 32XBR250 O KV 36FV1 KV
18. D641 is filtered by C641 and then sent to CN642 1 and 2 unregulated The audio B is used only by the Audio Output Amplifier IC1461 located on the AK board One step in troubleshooting a set that is shut down is to disconnect CN642 If the set still operates then replace IC1461 Audio Output Be sure to discharge the voltage at CN642 1 and 2 before reat taching the connector to CN642 Shorted Supply Distribution A Board T503 Flyback H Drive Q501 H Out Q502 Pin Amp Q512 WA board VM Drive Q946 A Board Q301 HP Buffer IC353 SHP All WA board except VM Drive A board TU102 Tuner IC351 VM Mute IC352 YUV Switch IC354 YUV Switch 1C355 Y C Jungle IC101 D A Converter AK Board IC1401 Audio Processor IC1403 SRS Q1102 Tuner 5 Volt Regulator C Board Q1790 IK Buffer UY Board IC2006 5 Volt Regulator IC3302 5 Volt Regulator IC3304 Chroma Decoder IC3308 YUV Switch UY Board IC2005 3 3 Volt Regulator IC2006 5 Volt Regulator for tuners UY5 from IC2006 UY5 from IC3302 IC3307 V Chip IC3303 PIP Processor Audio B 33 volts AK Board IC1461 Audio Output TO B OCP MIE TO D653 OCP m D D643 Q651 E 8 IC643 FOR C697 C696 L642 R652 REGULATION EVA 7 B Ne e o gt Ty Ee A D648 B s de C643 ain EZO150AV 7 TO E a gt da 12V gt A BD T601 1 Si Ng El cneat PRT gt RS I D651 5 O ov TO D605 s R645 R650 gt CN641 m imo FOLDBACK k R646 Q649 R644 T603 PIT L650 _ OB e PQO9RF2
19. LAY IC622 5V REG 7 2VDC BAOST STANDBY 5V TO A BOARD CN1641 TO Q646 E 8 BACKUP 3 CTV26 1187 12 28 99 Povver On Degaussing Overview This section discusses how the converter B voltage is created when the set is turned ON When the set is turned ON the degaussing circuit is activated Power On When the set is plugged in the AC voltage is applied through F601 T601 and T602 Additional components C605 VDR601 C604 and VDR602 are across the AC line input They are in place for protection from AC line spikes and surges This AC voltage is applied to the standby power sup ply and will be applied to D602 Bridge Rectifier when RY600 Power Relay is closed R623 and R664 will limit the current when the relay is initially closed When the customer turns the set ON using either the remote or the power switch a 5 volt signal is output from IC001 62 Tuning Micon O Relay This HIGH is sent to the G board via the wiring harness between CN1641 on A board and CN641 on the G board This signal is used to turn Q648 ON When Q648 turns ON it places a LOW at its collector This causes RY600 to energize closing the contact and allowing current to flow to D602 Bridge Rectifier The LOW from Q648 C is also applied to the Q646 Backup and Q647 Soft Start transis tors Voltage Doubler D602 Bridge Rectifier is used with C606 C607 D629 and D630 to form a voltage doubler Therefore the output of the voltage
20. O a E R387 R561 IC355 CXA2131S L D384 R567 C568 R585 Y CN MTZJ11B sr R559 2 VTIM R563 R578 I TH501 15V SCAN z DERIVED MAIN SUPPLY R536 D530 A BOARD VP FROM T503 7 VERTICAL DEFLECTION 10CTV26 1194 1 4 00 30 Horizontal Deflection Block Overview The horizontal deflection block creates the signal that drives the horizon tal yoke and also drives the flyback transformer to create the necessary high voltage focus voltage and other voltages used by the set The HD signal originates from the Y C J The HD signal is applied to the amplifiers in the H drive and H Out circuits The signal that exits the H Out transistor is applied to the flyback transformer and the deflection yoke The deflection yoke uses magnetic fields formed by the current through it to drive the beam across the screen Feedback from the yoke is coupled to the centering and linearity circuits This circuit ensures that the picture will be linear and centered properly These circuits work in conjunction with the pin amp on the return to the H Out 31 The purpose of the pincushion circuit is to correct for deflection distortion which occurs because of the yoke s inability to create a linear beam scan The result would be a picture bowed at the sides We compensate for this problem by using pincushion correction circuits to control the amount of current that can flow through the horizontal output s return More current is delivered so the bea
21. PLASTIC BAG E INSTRUCTION INSTRUCTION LEAFLET Ro C TO REPLACE A PART i TWO WASHERS sd Di JIG FOR SERVICE SCREW Fig 1 2 Use the Jig Screw to remove the original pivot by inserting the screw into the pivot hole and pulling down See Fig 2 REMOVING ORIGINAL PIVOT ORIGINAL PIVOT q gt INSERT SCREW PULL DOWN 8 REMOVE PIVOT Fig 2 Reference ECN KVC01816 PRINTED IN USA Replace the Pivot on the top of the Glass Doors and add the vvasher to the bottom pivots See Fig 3 4 5mm REPLACE 6mm PIVOT SU 36FD2 STAND 25mm 1 ORIGINAL POSITION of 19mm 3 47 POSITION of L LL S a PERMANENT 1 COUNTER MEASURE ADD WASHER MODIFICATION TO GLASS DOORS NOT TO SCALE Fig 3 4mm 5 5m Al SONY CONFIDENTIAL Sony Service Company National Technical Services Se Vice B U leti N 4 A Division of Sony Electronics Inc CSV Park Ridge New Jersey 07656 TV Products Model KV 27FV15 KV 32FS10 KV 32FV15 No 417 KV 32XBR250 KV 36FS10 KV 36FV15 KV 36XBR250 Subject Blinking Picture With Local Weather Channel Pate October 7 1999 Symptom 2314 On the Weather Channel when the program switches from the national to local weather the picture may jump blink or may blank out Solution If the customer should complain about the symptoms above then please check in the Service Mode that VSS 1 If not change VSS to 1 and recheck to verify
22. PLY 10 A T621 4 TO RY600 POWER RELAY IC622 5V REG 7 2VDC BAOST STANDBY 5V TO A BOARD CN1641 TO Q646 E 8 BACKUP 3 CTV26 1187 12 28 99 Over Current Protection OCP Monitoring the voltage across R637 is used for over current protection This voltage is representative of the amount of current flowing through Q621 Converter since it is in series with the transistor If this voltage should rise to 6 volts it will cause Q622 to turn ON If Q622 were to turn ON it would shunt Q621 G voltage to ground This would cause Q621 Converter to stop conducting Over Voltage Protection OVP Over voltage protection is done by rectifying the voltage at 1621 6 with D627 This voltage is filtered by C636 and applied to D626 through R638 If this voltage should rise above 6 2 volts D626 begins to conduct When its conduction allows Q622 Protect to turn ON over voltage protection is employed Q622 Protect turns ON and grounds Q621 G which stops the converter from switching D699 is also used for OVP The signal from 1621 4 is rectified by D698 This creates a negative voltage across C699 If this negative voltage becomes great enough D699 conducts and the Q621 G voltage is brought lower 11 Secondary Output The power coupled through T621 SRT places a voltage on 1621 9 that when rectified and filtered by D628 and C637 is 7 2 volts This voltage is constant d
23. SONY Training Manual WEGA Direct View Television AA 2W Chassis Models KV27FV15 KV32FV15 KV36FV15 KV32FS10 KV36FS10 KV32XBR250 KV36XBR250 Circuit Description and Troubleshooting Course CTV 26 Sony Service Company A Division of Sony Electronics Inc O1999 All Rights Reserved Printed in U S A SONY isatrademark of Sony Electronics Circuit Description and Troubleshooting Model kv27FV15 KV32FV15 KV32FV15 KV36FV15 KV32FS10 KV36FS10 KV32XBR250 KV36XBR250 Prepared by National Training Department Sony Service Company A Division of Sony Electronics Inc Course presented by Date Student Name SONY SEL Service Company A Division of Sony Electronics Inc 1 Sony Drive Park Ridge New Jersey 07656 CTV261299 Printed in U S A Features Board Descriptions Picture Tube Defect Symptoms V Chip Introduction What is V Chip Technology Parental Guideline Rating System Parental Control Menu Decoding Power Supply Block Standby Power Supply Converter Operation Regulation Power On Degaussing Power On Degaussing Converter Initial Start Up Soft Start Regulation Troubleshooting Table of Contents O _ ON DOA Aa OI N ZZ o o zm o NO 01 O nm G Soft Start Regulation Foldback Soft Start Regulation Foldback Secondary Voltages 135 Volts 12 Volts 9 Volts 5 Volts Audio B Power Supply Protection 135 Over Current Protection Foldback Verti
24. ble only TV Y TV Y7 TV G and G ratings Youth The youth selection is used to enable TV PG and PG ratings Ratings considered lower than these will also be enabled Youth Adult Tthe youth adult selection enables TV 14 and PG 13 ratings in addition to lower ratings Custom The custom selection allows you to tailor the age and con tent ratings to your liking The picture below shows the menu that will be seen when custom is selected TV RATINGS TV Y _ TV Y7 TV G TV PG TV 14 TV MA MENU Select category Move li Select Exit Here the user can select ratings by age or content If they do not want violence of any kind to be seen but are not offended by strong language they can select the V for PG 14 This will block all V settings above PG 14 Decoding The Parental Guideline Rating that is broadcast by the programmer must be decoded at the receiver This rating data is placed on Line 21 Field 2 or Line 284 The preceding waveform shows the contents of Line 21 Field 2 We see that right after the burst signal on the back porch of the horizontal sync is a clock signal This clock is used to inform the decoder that data is com ing and to synchronize the decoder and data Since there is other XDS Extended Data Services data on this line the first three data bit
25. broadcast without a rating Select category Movel Select 1 Exit fea The TV Ratings are both age and content based The level of the content rating is also based on age For example a program with a TV PG V Violence rating may contain moderate violence while a TV 14 V rating may contain more intense violence The consumer may choose to block Unrated programs If they do this they need to be aware that emergency broadcasts political programs sports news public service announcements religious programs and weather programs may be blocked Parental Control Menu Sony V Chip equipped televisions contain the Parental Control Menu which is located in the Setup section When it is selected the user will be asked for a 4 digit password After this password is entered the user will be asked to confirm it After confirmation the password is set Anytime the user wants to modify the Parental Control Menu the password must be entered Note If the customer forgets their password the master Password 4357 can be entered This allows the customer to reset their password No settings can be changed until a new password is entered When you have entered the password an options menu will be displayed The options are as follows Parental Lock This is used to enable or disable the ratings system This is done by selecting On or Off Rating There are four ratings that can be selected Child The child selection is used to ena
26. cal Deflection Horizontal Deflection Block Horizontal Out Pincushion H Protect Appendix Service Bulletins 19 19 19 19 21 21 21 21 21 21 25 25 25 27 31 33 35 37 Features Introduction This course covers AA2W chassis Sony direct view televisions These sets are part of the WEGA line which contain the flat screen FD Trinitron picture tubes This course describes the Power Supply Deflection and Protection circuits with a twist of practical troubleshooting tips and known solutions In addition this course reviews picture tube diagnostics and solutions plus the latest information on the V Chip The US models listed below use the AA2W chassis design KV27FV15 RV36FS10 KV32FV15 KV32XBR250 KV36FV15 KV36XBR250 RV32FS10 The following is a list of features that all of these models have FD Trinitronfi Picture Tube Trinitone Color Temperature Adjustment Dynamic Picture Processor Dynamic Focus Circuitry Customer Tilt Correction Auto Pedestal Clamp V Chip Parental Control Presets 1Front 2Rear A V Inputs CaptionVision CC XDS Extended Data Service Vertical Aperture Compensation Steady Sound With BBE Program Palette Magnetic Quadra Pole Focus SRS 3D Audio Effect The table below shows which features are different between models KV27FV15 KV32 36F KV32 36FS KV32 36XB V15 10 R250 Audio 15Wx2 15Wx2 10Wx2 15Wx2 Power Component N A Video Input Remote Infrared Headphones
27. clude the Micon and the re mote sensor When the set is turned ON by using either the power button or the remote control 5 volts is applied to CN641 11 This 5 volts is used to turn RY600 Power Relay ON When the relay closes a click is heard Closing the relay allows the rectified ac voltage to be applied to the converter circuit The converter begins operation when this voltage is applied The power ON line is also applied to the soft start circuit The soft start circuit holds the B voltage low while the power supply filters charge by controlling the voltage present across the control winding The control winding deter mines the switching frequency of the converter After soft start operation is complete the regulation circuit takes over operation of the control wind ing This allows the converter s output to be coupled through T605 to the secondary supplies These supplies supply power to the rest of the set The regulation circuit monitors the 135 volt line Shortly after the click of the power relay at turn ON another click is heard This click is RY601 Degauss Relay closing This may be accompanied by a hum sound that indicates the operation of the degaussing coils After the AKB circuit operation is considered normal the degaussing relay opens This is the third click that occurs about 8 10 seconds after the unit is turned ON During operation of the set the 135 volt line is monitored for DC protec tion This protection circuit
28. cycle will continue to repeat itself As the voltage across 1604 7 and 8 Control Winding changes the inductance of the other windings will change This will determine the frequency of switch ing 15 Soft Start The voltage across T604 7 and 8 Control Winding determines the fre quency of operation The control winding is a cross inductance winding At initial startup the converter has to switch above the optimum frequency of T605 PIT A soft start circuit is used to ensure that this occurs The soft start circuit will ensure that a voltage of approximately 7 volts will be applied across 1603 7 and 8 Control Winding After the converter begins to run the voltage from the Vcc Rect line is applied to T603 8 through D612 The voltage applied to T603 7 will then come from the regulator circuit instead of soft start Regulation The frequency of the power supply is dependent on the load that it sees When the picture brightness increases the load increases lowering the voltage across 1603 7 and 8 When this occurs the frequency of the oscillator decreases allowing 1605 to supply more current to the second ary windings This keeps the 135V line from lowering in voltage The following table shows what occurs with different loads on the supply Note that the oscillator frequency changed but the 135V line remained within a few tenths of a volt of its value You should also be aware that the frequency of operation is also dependent on the in
29. duce a signal that will be coupled to the transformers secondary windings where they are rectified and used to supply various voltages to the set The frequency of this switching is controlled to maintain a consistent value on the 135 volt line Changing the frequency of the switching can be used for regulation due to the efficiency characteristics of the transformer A second trans former with a cross inductance winding is used to create a dual tank oscillator The voltage across the cross inductance winding or control winding is used to change the value of the inductance in the tank circuit and consequently change the frequency of switching Initial Start Up When RY600 Power Relay not shown is closed 300 VDC is developed and applied to R607 Converter B is then applied to C613 and C615 C613 ensures that the bottom transistor IC601 1 turns ON initially When IC601 1 turns ON there is a current path through C615 T605 1 and 2 T603 1 and 2 through IC601 1 C E to ground The voltage applied to IC601 1 B by T603 4 sustains this current path This voltage at T603 4 is developed by the expanding magnetic field being produced by the current flowing through T603 1 and 2 When the magnetic field in T603 PRT stops expanding IC601 1 turns OFF When this occurs a voltage is induced by the collapsing magnetic field at T603 3 that turns IC601 2 ON This provides a discharge path for C615 When C609 is fully charged IC601 2 will turn OFF This
30. e then Enter key ope a KV 32FV15 IC001 CXP85856A 024Q CXP85856A 035S 8 52 911 19 KV 36FV15 IC001 CXP85856A 024Q CXP85856A 035S 8 52 911 19 RV IC001 CXP85856A 024Q CXP85856A 035S 8 52 911 19 32XBR250 RV IC001 CXP85856A 024Q CXP85856A 035S 8 52 911 19 36XBR250
31. econdary This voltage is rectified and called Vcc Rect Q624 is set up with the Vcc Rectifier volt age input to the emitter Its base is connected to the Rectified 12 volt line from the secondary side of the supply through D605 and R609 D605 is a zener diode whose breakover voltage is 13 volts This circuit will protect against two failures The first is a rise in the Vcc Rect This voltage is developed by the foldback winding of T605 This winding is used as a current mirror This means that the more current drawn on the secondary of T605 PIT the higher the voltage at T605 3 When too much current is drawn from the secondary Q624 would turn ON because of the increase in voltage across R610 If this occurs the latch and soft start circuits will be activated Soft start is activated to lower the output supply voltage by increasing the switching frequency The latch s purpose is to shut the supply down Secondly if there were a loss of the 12 volt line then D605 would breakover This would cause sufficient current flow through R610 and Q624 would turn ON If this occurs the latch and soft start circuits will be activated TO CN641 1 B4 R652 B 135V D648 A EZO150AVI R653 OVP 12V PART OF So d nei VCC RECT 0623 D604 OCP COP gt R601 D603 lt R663 9 gt R662 D607 RD6 8ESB2 C618 oo oa a TO Q648 POWER ON POWER ON FROM CN641 11 R610 A NO a653 Q624 D606 E R609 s FOLDBACK RD24ESD2 J maed
32. erting input This voltage is com pared to a reference voltage of 8 2 volts This reference voltage is derived by a voltage divider consisting of R533 D520 and D521 As long as IC501 2 is greater than IC501 3 the horizontal circuit is operating nor mally 37 IC501 2 is also connected to Q503 C Q503 is OFF as long as the signal from the Pin Out circuit is working normally If the Pin Out signal were missing Q504 which is normally ON would turn OFF If Q504 were to turn OFF Q503 would turn ON This would place IC501 2 at ground potential In that case IC501 1 would output 12 volts that would turn Q301 ON and ground the HP signal that is connected to Q301 If Q301 turns ON IC355 would shut OFF the drive signal at IC355 19 HD When the drive signal is removed the High Voltage is removed from the set This will cause a no video condition but the Timer LED will not begin to blink If the set is turned on with a failure that causes H protect to occur High Voltage would begin to come up and then disappear The timer LED would blink to indicate that the AKB circuit did not unblank the video The Timer LED only indicates an AKB failure when the set is turned from OFF to ON 12v 2 FROM C510 HP 12V IC501 2 2 H DRIVE 8V 135V R527 R533 NORMALLY ON e503 D530 FROM e504 8 2V Q512 C R544 gt V ko C549 Sy C548 OUT A R514 R521 C543 D521 A Ai MTZJ 7 5X R532 FROM R550 R529 T503 5 FLYBACK le Bages desa R531 R530 n
33. f the windings in T603 consequently increasing the converter fre quency When the converter frequency increases it moves further away from the optimum operating frequency of T605 PIT reducing the voltage at the secondary outputs The opposite occurs when the voltage across pins 7 and 8 decreases A correction voltage is produced by IC643 4 which varies inversely proportional to the 135V line Pin 7 of the trans former control winding is connected to the correction voltage The other leg of the control winding pin 8 is connected to the output from D603 Vcc Rectifier The difference in the voltage across this winding determines the frequency of the converter which regulates the 135 Volt line as de scribed in the previous sections Foldback The foldback circuit is a type of protection circuit that uses a winding on T605 PIT to monitor the current drawn by its secondary This voltage is rectified and called Vcc Rect Q624 is set up with the Vcc Rectifier volt age input to the emitter Its base is connected to the Rectified 12 volt line from the secondary side of the supply through D605 and R609 D605 is a zener diode whose breakover voltage is 13 volts This circuit will protect against two failures The first is a rise in the Vcc Rect This voltage is developed by the foldback winding of T605 This winding is used as a current mirror This means that the more current drawn on the secondary of T605 PIT the higher the voltage at T605 3 Whe
34. h Q646 Backup since the same line that turns RY600 Power Relay ON turns it ON The greater the voltage across this winding the higher the converter frequency and the lower the effi ciency of T605 PIT This is discussed in the Converter section There fore the start up secondary voltages will be reduced considerably As C602 charges the voltage difference between T603 7 and 8 diminishes As this voltage lowers the secondary voltages will rise When the Vcc Rectifier voltage is larger than the Standby unregulated voltage D612 will begin to conduct and the Vcc Rectifier voltage will control T603 8 Also at this time C602 will be fully charged and IC643 Control IC will take control over 1603 7 The difference in voltage between T603 7 and 8 will regu late the converters operating frequency Soft Start Reset It is important that the soft start capacitor C602 be fully discharged when the set is turned OFF Turning Q648 OFF when the unit is turned OFF does this This removes the ground path from the relay opening it up It also allows current from the Standby 5V to flow through the relay coil through R621 to Q647 B This turns the Q647 ON and discharges C602 through R627 Q646 Backup will also be turned OFF when the Power On line becomes HIGH 19 Regulation The power supply is regulated by the control winding of PRT T603 7 and 8 in the following manner An increase in voltage across the control winding will reduce the induc tance o
35. hat develops Converter B and can be noticed during troubleshooting when two clicks are heard in quick succes sion Latch Placing a HIGH on Q653 B activates the latch This turns ON Q653 that turns ON Q652 Once Q652 turns ON its conduction keeps Q653 ON until power is disconnected This places a LOW at Q648 B turning it OFF This causes RY600 Power Relay to open and the set turns OFF 135 Over Current Protection Over current is detected by monitoring the voltage across R652 When this voltage which rises as more current is drawn gets to a level that causes Q651 to turn ON the latch will be activated Vcc Rectified Low Voltage Protect LVP The signal from T605 3 is sent through R601 and rectified by D603 This voltage is filtered by C618 It is important that this voltage be at a certain level since it is used to control regulation Therefore a circuit is con structed in which Q623 is normally ON This transistor is ON because D607 should always have sufficient bias to turn ON This will place Q623 C at close to ground level This keeps D604 and D608 from conducting and activating the latch circuit If this voltage were to fall below a certain level D607 would turn OFF causing Q623 to turn OFF When Q623 is OFF the 12 volt line would cause D604 and D608 to turn ON activating the latch 25 Foldback The foldback circuit is a type of protection circuit that uses a winding on T605 PIT to monitor the current drawn by its s
36. he Con verter B at T603 2 This is where the switching waveform would nor mally be present If the voltage is lower at this point suspect an open related to IC601 2 or a leaky component related to IC601 1 If the voltage is high at this point suspect an open related to IC601 1 or a leaky compo nent related to IC601 2 Fully unloaded CN641 and CN642 unplugged Secondar Cold Ground Voltage Frequenc B 1V RS TO A 9V A BOARD 12V CN1641 E SECONDARY CN641 SUPPLIES he C615 3 ME ro 4 BOARD L CN1463 R607 R601 8 2 ES EE x TO PROTECTION D603 ZEE 18 LR o gt D606 K Q PRT ROI T603 J 2 e C612 Reog 609 ES e 4 5 C608 N VCC RECT FROM 10601 REGULATOR MX084 on C643 4 SOFT START K C610 T D62 QG45B 8 START Q645 E o FOLDBACK Q624E a R611 C611 O CONTROL Q646 E ea E CONVERTER 2CTV26 1186 3 22 00 18 Soft Start Regulation Foldback Overview The three circuits discussed here all have an affect on the voltages across T603 7 and 8 This winding of the PRT is a cross inductance winding or control winding that controls the frequency at which the converter oper ates Soft Start At power ON C602 which is discharged has a OV potential at its termi nal This biases Q645 ON via R647 With this transistor ON it allows the standby unregulated from Q646 E to be applied across T603 7 and 8 This voltage is passed throug
37. if the problem is solved if the symptom is still present then change the jungle IC355 on the A Board with the new type below The adjustments for Vertical Horizontal Color and Hue will also needed to be re adjusted IC355 CXA2131S CXA2131AS T 998 606 67 Reference M Matsuoka FPR U0828 PRINTED IN USA SONY CONFIDENTIAL ss Sony Service Compan Mad Technical Sonae Service Bulletin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 27FV15 KV 32FS10 KV 36FS10 N 422 KV 32FV15 KV 36FV15 KV 32XBR250 O KV 36XBR250 Subject G Board Schematic Correction Date September 20 1999 Symptom XXXX On the G Board Schematic the winding connections inside T605 is incorrect The windings between T605 pins 1 amp 2 and windings 3 amp 4 are missing Solution Please refer to the corrected schematic below The proper connections have a winding between T605 pin 1 amp 2 and T605 pin 3 amp 4 There is no winding between T605 pins 2 amp 3 as in the service manual schematic Cel T605 sa EPT ih G BOARD Haro CDR E A nee A FAR oinga 185 lav RECT NOT ILLUSTRATED 0652 F8644 IDINS4 TA2 Reference FPR U0789 PRINTED IN USA IA SONY CONFIDENTIAL Sony Service Company National Technical Services Se vice B U etl n A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model RV 32FS10 KV 32FV15 RV 36FS10 No 424 KV 3
38. lution Please add the following part number to the Service Manual REF DESCRIPTION PART NUMBER HEADPHONE MDR IF0230 8 953 742 90 Reference FPR U1120 PRINTED IN USA XI SONY CONFIDENTIAL es Sony Service Compan Mad Technical Sonae Service Bulletin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 27FV15 RV 32FS10 KV 32FV15 N 438 KV 32XBR250 RV 36FS10 KV 36FV15 O KV 36XBR250 Subject Control Door Breakage Date November 15 1999 Symptom 161X Weak or broken Control Door hinges Solution If the customer should complain of the above symptom please replace the Control Door Assembly with the new improved part _ Reference TV99 09 PRINTED IN USA SONY CONFIDENTIAL Sony Service Compan Boa I ne Se VICE B U leti N A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 27FV15 KV 32FS10 KV 36FS10 N 441 KV 32FV15 KV 36FV15 KV 32XBR250 O KV 36XBR250 Subject S Link IR Headphone OSD and 3D Comb Date November 22 1999 Filter Mis Operation Symptom 172X The following Symptoms may occur 1 S LinK When the TV detects the S Link signal in stand by mode TV is supposed to automatically turn on and select appropriate video input It does turn on but it does not select the appropriate input 2 OSD When customer tries to enter password for V chip in Spanish menu customer will see additional
39. m can be pushed to the sides of the tube when necessary The drive for the Pin amp is created in the Y C J and is called E W drive It is applied to the Pin amp with a sample of the HP pulse Q512 controls the current through the H Out return A protection circuit also monitors the HP signal This protection circuit allows HP signals to pass to the Y C J if the Pin amp and H Out circuits are operating normally In the event of a failure the HP Hoff line to the Y C J would go LOW The Y C J would then disable HD which would cause high voltage to be lost HP ABL ae Q501 T503 HV H OUT FLYBACK Sp SCAN 200 Q501 H DRIVE DERIVED 412 Y C J IC355 a SUPPLIES 15 Q512 PIN AMP CENTERING LINEARITY H PROTECT HORIZONTAL DEFLECTION BLOCK E H 32 Horizontal Out Overvievv The horizontal output circuit belovv consists of the Horizontal Oscillator Horizontal Drive Horizontal Output Flyback and Horizontal Centering and Linearity Horizontal Oscillator When the TV is turned ON Set 9Vdc appears and is applied to Y C Jungle IC355 33 and 44 IC355 contains a horizontal oscillator that is shaped into a horizontal drive pulse that leaves at pin 19 7 i ee ta Q501 B 5V 20us Horizontal Drive Q501 amplifies this HD signal and outputs the signal from its collector This signal is coupled by T501 to drive the horizontal outpu
40. n too much current is drawn from the secondary Q624 would turn ON because of the increase in voltage across R610 If this occurs the latch and soft start circuits will be activated Soft start is activated to lower the output supply voltage by increasing the switching frequency The latch s purpose is to shut the supply down Secondly if there were a loss of the 12 volt line then D605 would breakover This would cause sufficient current flow through R610 and Q624 would turn ON If this occurs the latch and soft start circuits will be activated SOFT START FOLDBACK REGULATION STANDBY 0 5V re PART OF 135V I RY600 FROM R661 De R658 1 CONTROL D643 IG SME B RECTIFIER R648 o R649 3 C651 T603 PRT CONTROL WINDING G BOARD POWER ON erg 2648 ak FROM R626 614 gt CN641 11 gt K LATCH C624 R622 D606 RD24ESB2 D605 12V FROM MTZJ T OVP D651C 8 7713A R609 D652C gt TO D607 EM S gt C618 PART OF 77 T605 PIT R618 STANDBY UNREG FROM D628 k 5CTV26 1188 1 4 00 20 Secondary Voltages 135 Volts The signal from the winding of T605 10 and 11 is applied across D643 Bridge Rectifier and C643 and L642 filter the rectified voltage D648 isa 150 volt zener diode that will limit the voltage to 150 volts in case of a failure that causes the B to rise This voltage is then sent through R652 and output from the G board at CN641 1 and 2 The voltage is used on the G board by the protection and
41. oltage Grid 3 leakage Bright picture with retrace lines and or poor focus RGB Rainbow see rainbow picture Aperture grill was transit Purity Beam The TV s landing is off circuit did not demagnetiz e aperture grill metal support unseated in degaussing Symptom is that all three colors are bright Rainbow of colors can start at the top or bottom bottom rainbow shown Same color blotches remain at that area of the screen regardless of picture screen changes Reduce G2 screen voltage to the lowest setting Vary focus control to both limits several times Put on safety apparel Place the tube face down and lightly tap the neck to dislodge the particle A loose aperture grill is dangerous and may cause tube implosion Use all safety precautions Do not jar set Transport TV face down Do not manually Degauss the picture tube with a strong degaussing coil Repair the TV s degaussing circuit The thermistor or cold solder is usually at fault Only the heater pins should have resistance All other pins have infinite os resistance to each other and to either heater pins Used picture tubes that have a heater cathode leakage short have a low restoration success level Do not manually Degauss New 27 35 picture tubes are magnetically conditioned for optimum beam landing Strong manual degaussing will destroy this conditioning Applying disc magnets P N
42. on has menu options for determining which programs should be blocked These op tions are compared to the data received and programs are blocked ac cordingly Parental Guideline Rating System The ratings can be separated into three categories They are TV Ratings Movie Ratings and Unrated The following table shows the ratings for the three categories TV RATINGS Block programs by their rating content or bath MOVIE RATINGS Age based options TV Y All children TV Y7 Directed to older children TV G General Audience TV PG Parental Guidance suggested TV 14 Parents Strongly cautioned TV MA Mature Audience only Content based options FV Fantasy Violence D Suggestive Dialogue L Strong Language S Sexual situations V Violence U S models only G All children TV PG Directed to older children PG 13 General Audience R Parental Guidance suggested NC 17 No one under 17 admitted X No one under 17 admitted TV RATINGS PTV Y TV Y7 _ FV TV G Select category Move Hi Select CH Exit MOVIE RATINGS PG PG _ PG 13 _ A NC 17 _ X MENU Select rating Move if Select CE Exit y U S models only CUSTOM MENU VIEW ALL Allows all unrated programming TV RATINGS BLOCK TV Blocks all unrated TV programs SONA ED VC At BLOCK MOVIE Blocks all unrated movies MENU BLOCK ALL Blocks all unrated programming UNRATED Block programs or movies that are
43. ower and OFF degauss relays as normal Two normal clicks No video for 30 seconds Normal Flashing for Normal Two clicks but third click then flashing horizontal line first 30 Power and degauss isnt across the screen Line is seconds then degauss heard for 30 about 1 inch thick stops relays as seconds normal Missing Three relay clicks None Normal Not flashing Normal Two clicks data or Power Relay Power and clock degauss and then degauss degauss again relays as Second degauss normal click occurs guicker than normal Missing Three relay clicks None May or may not be Flashing Comes up No click Scan Two are normal heard before until derived third is shutdown shutdown shutdown 12 volts Missing Two clicks Power None May or may not be Flashing Normal Two clicks Scan and Degauss relays heard before Power and derived shutdown degauss 15 volts relays as normal Shorted Normal three clicks Yes but there are two red Normal Normal Normal Two clicks or open green and blue lines each in Flashes until Power and C565 the top half of the picture If picture is degauss video is input these lines displayed relays as remain and white retrace normal lines are seen in the top x D388 MIZJ11B 412V SCAN D561 C565 DERIVED SAN gt Si SUPPLY R537 D531 12V CN1942 FROM T503 8 TOWA BOARD CN942 Q561 9V i TO IC355 15 SCL VM OUT SDA V PROTECT FLYBACK R569 GENERATOR N S AE q R384 nes
44. put AC line voltage White Raster No Input 0 2 38 VDC V across pins 7 and 2 18 VDC 8 T603 Freq at IC601 E2 62 kHz 66 kHz V at CN641 1 135 3 VDC 135 6 VDC RS TO A 9V A BOARD 12V CN1641 E SECONDARY CN641 SUPPLIES he C615 3 ME ro 4 BOARD L CN1463 R607 R601 8 2 ES EE x TO PROTECTION D603 ZEE 18 LR o gt D606 K Q PRT ROI T603 J 2 e C612 Reog 609 ES e 4 5 C608 N VCC RECT FROM 10601 REGULATOR MX084 on C643 4 SOFT START K C610 T D62 QG45B 8 START Q645 E o FOLDBACK Q624E a R611 C611 O CONTROL Q646 E ea E CONVERTER 2CTV26 1186 3 22 00 16 Troubleshooting One of the most common failures in switching power supplies are the converter transistors or in the case of this power supply IC601 IC601 actually contains two identical transistors They are assembled in this package so that their gain and other characteristics are closely matched Generally when these transistors fail they fail by shorting C E in one or both of the transistors This causes the fusible resistor to open due to excessive current draw The fusible resistor in this case is R607 The symptom in this set is that you hear only one relay click on initial power up instead of three Usually you would hear two the power relay followed by the degaussing relay This would be followed by another click about ten seconds later that indicates the degaussing
45. regulation circuits and is also used to produce the 33 volt line on the A board 12 Volts D651 and D652 rectify the signal from T605 7 and 8 This voltage is filtered by C658 and input to IC650 12 Volt Regulator IC650 outputs a regulated 12 volts that is filtered by C661 and output from the G board at CN641 8 9 Volts The signal from T605 7 and 8 is applied to D642 through two similar par allel networks consisting of L650 and R670 and L651 and R670 This rectified voltage is then applied to the input of IC641 9 Volt Regulator The output of this IC outputs 9 6 volts to L652 and also to CN641 6 and 7 21 The voltage is 9 6 instead of 9 because D647 is connected between the ground pin of IC641 9 Volt Regulator and ground 9 Volt Protection The 9 volt line also is monitored for OCP Using the voltage drop across R680 R681 and R644 to control the conduction of Q649 does this When the amount of current drawn on the 9 volt line is sufficient to cause Q649 to conduct Q650 will be turned ON This places a LOW on the inhibit line of IC641 9 Volt Regulator When there is a LOW present at this pin the output of IC641 is disabled 5 Volts The 5 volt line will not be discussed since it is not used in the set Audio B The signal from T605 5 and 6 is applied to D641 Bridge Rectifier The negative side of D641 is connected through R643 to ground therefore the Audio B floats slightly above ground level The voltage output from
46. s are known as the identifier Data 001 identifies the data as Parental Ratings data Then two bytes of data are sent which contain the rating informa tion The first byte contains information about the age rating and the second contains information about the content rating Ratings are decoded by the System Control IC in Sony televisions These ICs contain the programmed information and the decoder When a pro gram is determined to have a rating that should be blocked this is recog nized The System Control IC also contains the OSD outputs When the program is to be blocked the OSD section outputs a black screen along with the blocked show s rating For example if the Parental Controls are set to Child and the received program is rated TV 14 the screen will be black with TV Rating TV 14 in white letters There is also an additional V Chip IC used on sub tuner video This pre vents blocked programs from being displayed in the PIP window Power Supply Block Overview The power supply in the AA2W chassis is located on the G board AC from the outlet is applied to a series of line filters and protection devices and eventually applied to the standby supply AC rectifier and degauss circuits The Standby supply is a switching supply whose output is ap plied to a 5 volt regulator The output from the regulator exits the G board at CN641 10 It is applied to various components in the set that need to be powered when the set is OFF These in
47. sible resistor used for current limiting and failure protection It will open if the standby switch ing circuit draws excessive current Please note that the board has 1621 SBT silk screened on it This differs from the service manual which calls T621 SRT When the voltage is applied to T621 1 SRT Input current flows through the winding and R631 to Q621 G Q621 Converter is a FET with added protection When a positive voltage is applied to the gate it begins to conduct drain to source This reduces the voltage at 1621 3 to close to zero Normally this would reduce the voltage at Q621 G but a voltage is supplied to the gate through R632 and C630 from 1621 4 This voltage is induced into the secondary winding of 1621 4 when current flows through the winding between 621 1 and 1621 3 The voltage is not permanent due to C630 As C630 charges it reduces the voltage at Q621 G Once this voltage falls below a certain threshold Q621 Converter turns OFF Once Q621 Converter turns OFF all polarities are reversed This rever sal of polarity helps speed up turn OFF of Q621 D623 along with C631 and R640 form a snubber network voltage clamp This network clamps excessive voltage overshoot caused by the collapsing magnetic field of T621 SRT and returns the excessive voltage to C629 When the field collapses fully current begins to flow through T621 1 and 3 The waveforms below show what will be seen at Q621 Q621 S
48. t Q502 B E junction RS Q502 B 10V 20us 33 Horizontal Output Q502 is the H output transistor and it drives two circuits The deflection yoke Develops a magnetic field in order to move the electron beam from left to right on the screen The flyback transformers Develops high focus and screen voltages The scan derived power supplies are also developed here They are 200 volts 12 volts and 15 volts for the CRT Amp and TV s vertical section Heater voltage for the tube s filament is also developed here The horizontal protection circuit also uses the heater voltage The HP pulse is fed back to monitor the frequency of the horizontal oscil lator The horizontal output is also modulated by Q512 Pin Out This is necessary to correct for pincushion distortion that would be seen if cor rection were not used WERE CN501 3 50V 20us C510 10V 20us Horizontal Centering and Linearity Changing the DC voltage at the return line of the horizontal yoke performs horizontal Centering The 135 volt line is switched through a series of voltage dividers using S501 and S502 The different combination of switch settings changes the DC level at the yoke return and consequently the centering of the pic
49. th RF amp Video mode VP SSHP RF Data se Video Data DA 2COL RF Data gt Video Data o DA 2SHU RF Data o Video Data Sama 2 1 Replace the CPU IC001 2 Enter the service Mode using the remote Then press 8 then Enter This will reset the CPU turning the set off then back on automatically 3 Re enter the Service Mode 4 In the RF mode replace the data in the 2SHU 2COL 8 SSHP with the recorded data from the original CPU 5 In the Video mode replace the data in the 2SHU 2COL 8 SSHP with the recorded data from the original CPU 6 Change the Data of ID7 from Oto 2 7 Write the new data into the CPU using the remote press the Mute then Enter key 32 36 XBR models 1 Inthe service Mode record on paper the following register information in both RF amp Video mode VP SSHP RF Data se Video Data DA 2COL RF Data gt Video Data o DA 2SHU RF Data Video Data 1 2 1 Replace the CPU IC001 2 Enter the service Mode using the remote Then press 8 then Enter This will reset the CPU turning the set off then back on automatically 3 Re enter the Service Mode 4 In the RF mode replace the data in the 2SHU 2COL 8 SSHP with the recorded data from the original CPU 5 In the Video mode replace the data in the 2SHU 2COL 8 SSHP with the recorded data from the original CPU 6 Change the Data of ID7 from 9 to 11 7 Write the new data into the CPU using the remote press the Mut
50. tron beam to the top of the picture The flyback generator stage within IC561 uses the vertical signal to make a 30Vp p pulse needed during retrace time The retrace portion of the vertical drive signal input IC561 1 and 7 is extracted and ampli fied and appears at pin 3 as a 30Vp p pulse It passes through C565 to provide sufficient current to power IC561 6 during retrace time Diode D561 blocks this pulse from the 12 volt source The vertical flyback pulse from IC561 3 is sent to the WA board to be used by the Quadra Pole Focus circuit It is also goes to C564 C654 blocks any DC and allows the flyback pulses to be applied to Q652 B These pulses keep Q652 ON and prevents C563 from charging There fore Q561 is always OFF while the set is operating normally If the verti cal flyback pulses were missing the voltage from the 12 volt line through R570 would forward bias Q561 B E This would apply a low to IC355 15 VM Out V Protect If IC355 15 were to receive a LOW the IC would blank the video If there were problems in this area when the unit is initially turned ON the result would be similar to an AKB problem The degauss relay would not turn OFF and the Timer LED would be flashing Deflection yoke The deflection yoke translates the electrical current flowing through its coils into a magnetic field that positions the election beam vertically Current flowing through the deflection yoke coil is returned to ground through R578 R563 and R
51. ture Horizontal linearity is determined by feeding back the yoke return signal through an elaborate filter network which is made up of 505 and its associated components to reference of the horizontal output 9V MAIN T503 1 2 FLYBACK one Q502 ANODE R513 fa a C507 D502 6 C509 A 9 GS sas I 200V EY 554 D503 C510 a BOARD B C511 135V 7 ABL A X D504 sei Fe hi C513 C1501 C514 mi FT 3 De 19 402 E E e C518 T502 El DY L501 adj 1505 i gora im BR HLT 2 1 09 7 7 4070 S501 H CN501 i gt CENTERING L505 a S502 H R CENTERING 553 R511 4 4R512 a JW R520 o C516 C515 R510 D506 2 C517 L502 H OUT 11CTV26 1193 12 22 99 34 Pincushion Overvievv The purpose of the pincushion circuit is to correct for deflection distortion This distortion occurs because of the yokes inability to create a linear beam scan The result would be a picture bowed at the sides We com pensate for this problem by using pincushion correction circuits to control the amount of current that can flow through the horizontal output s return More current is delivered so the beam can be pushed to the sides of the tube when necessary Circuit Description The E W signal from IC355 11 is input to IC501 Pin Control at its inverting input A sample of the ABL signal from 7503 11 is also input to this same input The main HP signal from C510 in the Horizontal Output section is applied to
52. ue to the regulation circuit on the primary side of T621 SRT This 7 2 volts is applied to Q646 E for backup during the start of regula tion by the regular power supply It is also applied to IC622 5 Volt Regulator which regulates its output to 5 volts This 5 volts is sent to CN641 10 which connects to the A board and powers the Tuning Micon and other circuits It is also applied to RY600 Power Relay Checking Q621 Testing a MOSFET device is simple The leads show infinite resistance to each other except for drain to source in one direction because of the presence of a protection diode To prove the device is functional 1 Connect the negative lead of the onmmeter to the SOURCE lead 2 Touch the ohmmeter positive lead to the gate to pre charge it 3 Connect the ohmmeter positive lead to the DRAIN If the device is good you will get a resistance reading of about 400 1k ohms Some DVMs do not produce enough DC voltage in the ohms mode The diode check mode can be used with these models When using the diode mode a low voltage drop is shown after pre charging the gate D621 4 7 OHMS SHH D622 R640 C631 FROM T601 1 AC Hi SIDE A D623 R631 Q621 D698 A 2SK2845 ali C629 FROM R637 R623 amp R664 AC Lo SIDE C630 R632 A D699 MTZ T 77 1 D624 V D625 R633 C633 R634 DI D626 R638 RD6 2ESB2 C635 STANDBY SUPPLY 12 A T621 4 TO RY600 POWER RE
53. unnecessary letters Pr preceding correct OSD 3 IR Headphone In XBR models only When customer swaps audio of main picture and PIP picture customer can hear the audio of PIP picture even when it is Supposed to be blocked 4 3D Comb Filter In XBR model only when customer changes video input from S to composite customer can see a Black amp White picture less than one second then color returns Solution If the customer should complain of the following symptoms please do the following 27 inch models 1 Inthe service Mode record on paper the following register information in both RF amp Video mode VP SHUE RFData__ Video Data VP SCOL RF Data gt Video Data VP SSHP RF Data gt Video Data 2 1 Replace the CPU IC001 2 Enter the service Mode using the remote Then press 8 then Enter This will reset the CPU turning the set off then back on automatically 3 Re enter the Service Mode 4 In the RF mode replace the data in the SHUE SCOL amp SSHP with the recorded data from the original CPU 5 In the Video mode replace the data in the SHUE SCOL amp SSHP with the recorded data from the original CPU 6 Change the Data of ID7 from O to 2 7 Write the new data into the CPU using the remote press the Mute then Enter key 32 36 Non XBR Models Reference Uchida K PRINTED IN USA IX IIX 32 36 Non XBR Models 1 In the service Mode record on paper the following register information in bo
54. ys be checked if a vertical output failure is suspected The 15 volt line is derived from the signal at T503 7 It is sent through R536 and rectified by D530 In the event that a short occurs on this line R536 may open Since the vertical output is supplied by this line R536 should always be checked if a vertical output failure is suspected In addition to the scan derived supply voltages T503 Flyback Transformer also develops heater voltage from T503 5 T503 also develops high volt age focus voltage and ABL gt 12V To A Board IC501 Pin Control IC561 V Out R537 D531 v To IC501 Pin Control IC561 V Out Q511 Pin Drive WA Board IC961 N S Amp TO H PROTECT TO CN503 C BOARD SCAN DERIVED SUPPLIES The table below describes various symptoms that can occur if there is a Many times observing all the symptoms can lead you towards the correct short on any of the power supply lines These types of problems occur failed component or problem All of your senses should be used when when major components being supplied fail by shorting An example troubleshooting What you see hear and smell can often lead you to would be if the audio amp were to fail the set might shut down as if the quick fix Audio B line were shorted Voltage Relay Clicks Video Timer HV Power Switch OFF LED 2 clicks very close None None Blinking None No relay click but Q502 H Out 1503 together Power Only Timer LED stops Flyback Q512 Pin blinking Out 1
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