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Service Manual - Linfotech.co.uk

1. ox NS gt Proceed Checking the DC DC converter circuit section v 15 there 2 5V supply on 1315 012 D14 D17 F17 K17 M17 P17 T17 U16 U14 U11 U9 U7 U4 4 7 A8 A10 A11 xi Proceed Checking the DC DC converter circuit section OK v Is 24MHz clock input to 1315 pin 4 at TTL level Is 24M Hz clock output from X303 NG gt pin 5 at TTL level ok 15 3 3V supplied to X303 pin 8 Failure point NG Failure point Print wire broke between X303 pin 5 B Peint HUN uad 48 and 1315 pin 4 p v Is 5 0V supplied to 1315 pin T1 at Failure point High level Reset signal X303 failure Check the output of 5 0V H pulse di gt from 1301 pin 6 yY NG 15 5 0V supplied to 1301 pin 7 Failure point 1315 failure OK E NG ailure point OK 1 1322 failure 2 L315 open v Failure point Failure point Print wire broke between 1301 pin 6 and 1315 pin Trouble Shooting Page 11 LITE 9 No power on Check the 19V power is supplied from AC adapter NG U170ATA Failure point AC adapter failure v Y Is LED turned on in amber momentarily when a power button is pushed NG v Failure point Fuse failure Proc
2. 15 Index Trouble Shooting LITE U170ATA 1 No display of screen Screen is black color of LED is amber Does OSM display when you push PROCEED button When a Signal isn t being inputted it is ndicated with VIDEO ie Vue Bec gt INPUT It is indicated Preceed No OSM display section with OUT OF RANGE at the time of the frequency that it can t be distinguished wn Check if the sync signal from Computer is output and if the video cable is connected normally Input the sync signal of computer or NG OK change the cable v Proceed Checking the resolution change IC movement section Trouble Shooting Page 1 LITE U170ATA 2 Nothing displays on screen Screen is black color of LED is green Is backlight lit NG Refer Checking the backlight unit section v Check the video cable for failure Check the host for output signal with all black only Does computer output RGB video signals 1 Change pattern of video signal output on the host 2 Reconnect the video cable 3 Change the video cable NG v v Check OSM menu is displayed on screen When you push the PROCEED key Check if the LCD video signal cable is connected O
3. 8 5 1 NO OSM display 8 5 2 OSD Adjust problem 8 6 Abnormal plug and play operation 9 6 1 Abnormal 2 9 7 Checking the interface circuit of sync signal 10 7 1 Checking the control circuit of horizontal sync pulse 10 7 2 Checking the control circuit of vertical sync pulse 10 8 Checking the resolution change IC movement 11 9 No power on 12 10 Checking the DC DC converter circuit 13 11 Checking the operation of CPU 14 12 Checking the audio circuit
4. Check the positive DE pulse output to RN314 pin 6 from 1315 pin F18 at TTL level Failure point NG gt 1 Printed wire broke between 1315 pin F18 and RN314 6 OK 2 1315 failure v Check the SHFCLK OUTPUT to L322 pin 2 from 1315 pin 620 at TTL level Failure point NG 1 Printed wire broke between 1315 pin 620 and L322 pin 2 Ok 2 L321 open 3 C583 short 4 C590 short 5 L322 short 6 1315 failure v Next Page Page 6 Trouble Shooting LITE U170ATA Continue Check 1319 1320 all LVDS signal pins Failure point 1 1319 1320 faulure NG 2 Printed wire broken between 1319 1320 and P307 OK Check SDRAM IC clk signal output to 1318 1316 1317 pin 35 from 1315 pin T3 Failure point 0 NG p 1 R396 open K 2 Printed wire broken between 1318 1316 1317 pin 35 and 1315 pin T3 3 1315 failure v Check all Data Address pins signal between 1315 and 1316 1317 1318 Failure point OK NG Pi 1 Printed wire broke between 1318 1316 1317 and 1315 2 1315 failure 3 1318 1316 1317 failure v Process Checking the resolution change IC movement Section Trouble Shooting Page 7 LITE U170ATA 5 Abnormal OSM display 5 1 NO OSM display Check the input of 3 3Vp p pulse from 1315 pin P3 P4 R1 R2 P2 P1
5. Failure point 1 Printed wire broke between 1315 pin P3 and 1302 pin 5 2 Printed wire broke between 1315 pin P4 and 1302 pin 4 ING 3 Printed wire broke between 1315 pin R1 and 1302 pin 3 Ok 4 Printed wire broke between 1315 pin R2 and 1302 pin 2 5 Printed wire broke between 1315 pin P2 and 1302 pin 7 6 Printed wire broke between 1315 pin P1 and 1302 pin 6 7 RN301 RN303 open short Proceed Checking the resolution change IC movement section 5 2 OSD Adjust problem Check the input TTL level whether was changed when pressed function keys Failure point Printed wire broke between P302 pin 3 and 1302 pin 15 Printed wire broke between P 302 pin 4 and 1315 G19 Printed wire broke between P 302 pin 5 and 1315 pin G18 Printed wire broke between P302 pin 6 and 1315 pin L1 Printed wire broke between P 302 pin 7 and 1315 pin M1 C322 C323 C324 C326 C327 short RN306 RN307 short open 1315 failure NG K C Un SW woe Proceed Checking the resolution change IC movement section Page 8 Trouble Shooting LITE N U170ATA 6 Abnormal plug and play operation 6 1 Abnormal DDC2 Confirm the output of serial data on 1312 pin 6 1310 pin 6 synchronize SCLK at TTL level Failure point NG 1310 1312 failure Failure point 1 The host machine isn t communicating
6. 8 2 Display mode identification 2 8 3 User control 4 8 4 Control of identification converter LSI IC 14 5 8 5 bus control 5 8 6 Power ON sequence 6 8 7 Power OFF sequence 7 8 8 List of CPU assignments 8 Circuit Description Index LITE U170ATA 1 Audio circuit Circuit diagrams Main PWB 1 1 JACK PWB 1 1 1 1 Audio input The audio signal input received from the audio input terminal JK011 is applied to the pre amplifier 1006 of 2 L CH and 29 R CH through the low pass filter consisting of R047 R049 R048 R050 C062 and C063 In this pre amplifier controls of Volume Balance Bass and Treble are conducted The audio signal controlled at the pre amplifier is entered in and amplified at the AMP 1007 of 9 L CH and 1 R CH Since then the signal is to the output jack 1 2 Audio output The
7. 1 1315 failure 2 Printed wire broke between 1315 and RN314 pin 6 v Check the data signal output on 1315 R G B data pin Failure point OK ve 1315 failure v Check 1319 1320 all LVDS signal pins Failure point Ne 1 1319 1320 failure 2 Printed wire broke between 1319 1320 and P307 Failure point 1 The cable broke between P304 and LCD module 2 LCD module failure Page 4 Trouble Shooting LITE U170ATA 3 Checking the back light unit S 191 supplied to F301 pin 1 NG gt Are connected AC adapters normal goods OK Failure point Y OK An AC adapter is changed to the normal goods Is 19V supplied to P 308 pin 3 4 to inverter PWB v i i Failure point NG Failure point p OK Printed wire broke between Inverter cable disconnection P312 pin 1 v Check the BKLT EN signal of the rectangle input 1327 pin 3 at TTL high level L yg San level being output in the TTL level from 1306 pin 14 Or is BKLT EN signal of the rectangle being output OK NG y Failure point Printed wire broke between 1306 pin 14 and 1327 pin 3 v Check the PWM signal of the input from 1315 pin M4 R374 pin 2 is a PWM signal Failure point OK NG 1 Printed wire broke between 1315 pin M4 and R374 pin 2 2 1315 failure Failur
8. audio signal is output from the output terminal P012 of the jack to the speaker system 2 Power supply Circuit daigrams MAIN PWB 8 10 9 10 10 10 l 1322 DC DC converter A 5 power supply for LCD module CPU and logic is generated from the 19V source 2 I323 3 terminal regulator A 3 3V power supply for Scaler IC 1315 LVDS IC 1319 1320 is generated from the 5V source 3 I330 3 terminal regulator A 3 3V power supply for SDRAM IC 1316 1317 1318 is generated from the 5V source 4 324 3 terminal regulator A 2 5V power supply for Scaler IC 1315 is generated from the 5V source 0307 1321 ON OFF control for LCD Module ON OFF control is performed for power ON OFF and also for the power saving sequence 3 Video input circuit Circuit diagram MAIN PWB 4 10 The AC coupled video signal is used to clamp the black level at 4 Definition converter LSI peripheral circuit Circuit diagram MAIN PWB 1315 gm5020 15 the definition converter LSI The analog G B signal input entered from the video input circuit is converted into the digital data of video signal through the incorporated A D converter Based on this conversion this device performs interpolation during pixel extension The source voltage for this device is 3 3V 2 5V and the system clock frequency is 24MHz The withstand voltage level for the input signal voltage if 1315 is 3 3V and 5V 5 System reset LED control circuit Circuit diagram MAIN PWB 3 10 5 System r
9. 1 47 28 322 2 640x480 60Hz 31 47 25 175 3 MAC 640x480 66Hz 4 VESA 640 X 480 72Hz 5 VESA 640 X 480 75Hz 6 VESA 640 X 480 85Hz 43 27 36 7 VESA 800 x 600 56Hz 8 VESA 800 x 600 60Hz 9 VESA 800 x 600 75Hz 10 VESA 800x600 72Hz 11 VESA 800x600 85Hz 12 MAC 832 624 75Hz 13 VESA 1024x768 60Hz 14 VESA 1024x768 70Hz 56 48 75 15 VESA 1024 x 768 75 16 VESA 1024x768 85Hz 17 VESA 1280 x 1024 60Hz 64 108 18 VESA 1280 x 1024 75Hz 19 VESA 1280 x 1024 85Hz 20 VESA 1152x864 75Hz 67 5 108 21 VESA 1280x960 60Hz 60 108 22 1280x960 85Hz 85 9 148 5 Circuit Description Page 3 LITE U170ATA Table 2 the number of the lines Vsync distinction distinction lines 640 x 480 487 LINE lt 607 ____ 78Hz fV 6 O 800 x 600 607 lt LINE lt 777 58Hz fV 63Hz 8 T73Hz fV 78Hz 9 8264 G6GOsINE 2 231 0 1024 x 768 768 LINE lt 870 ____ 78Hz fV 16 870 lt LINE 1031 _____1280 960 960 lt 1 lt 1027 1280x1024 1077 LINE 9 3 User Control 9 3 1 Related ports of 1315 and pin of 1302 Port Signalname Function Remarks GPIO4 I315 MI p pens EXIT ENTER switch input ENTER Withdraw DUET OSD GPI 5 1315 11 pow SE Lom ssom ____ _ E 9 3 2 Functions Control is effected for the push switches to be
10. K Me between the MAIN PWB and LCD module v Failure Point NG Proceed Abnormal screen section OK The Cable is disconnected Next Page Page 2 Trouble Shooting LITE U170ATA Continue v Check the 3 3 V power are supplied on 1323 1330 pin 2 Check if the voltage on 1323 1330 pin 3 that is high level DC at 5V Failure point OK OK i 1 Printed wire broke between 1322 and 1323 1330 2 1322 failure v Failure point 323 1330 Failure v Is a dot clock being outputted under the condition that a LCD module is connected to L322 pin 2 Failure point 1 1315 failure 2 Printed wire broke between 1315 and L322 pin 2 Check the H sync pulse of negative polarity is output on RN314 pin 8 at TTL level Failure point NG gt Ok 1 1315 failure 2 Printed wire broke between 1315 and RN314 pin 8 Check the V sync of negative polarity are output on RN314 pin 7 Failure point NG OK gt l 1315 failure 2 Printed wire broke between 1315 and RN314 pin 7 v Next Page Trouble Shooting Page 3 U170ATA Continue v Check the data enable of positive polarity are output on RN314 pin 6 Failure point OK 9
11. LITE Service Manual 17 inch LCD Monitor U170ATA Table of Contents 1 Audio circuit 1 1 1 Audio input 1 1 2 Audio output 1 2 Power supply 1 3 Video input circuit 1 4 Definition converter LSI peripheral circuit 1 5 System reset LED control circuit 1 6 EPROM for PNP 1 7 2 2 2 2 2 8 CPU circuit 2 8 1 Dection of POWER switch status 2
12. ULL 4 4 145 ms Backlight_EN Page 6 Circuit Description LITE U170ATA 8 7 Power OFF sequence When the POWER switch is pressed while the power supply is ON the POWER ON signal is turned When this H potential is detected the CPU begins to turn off the respective power supplies according to the sequence shown below POWER rep 0 Mms m LVCC 75 ms Audio EN 4 300 ms more LED 75 ms Panel_ VCC So 4 50 ms Backlight EN gt 50ms Circuit Description Page 7 LITE 8 8 List of CPU Pin Assignments _ _____ ____ Peco 2 oe 3 Matar _ems0a0 abit inerfce data Peg 4 How ait 5 moams abit interface data Ewa s esoo aoire lock 7 ms soane Depos cma cm Jc o Ens 3 m onmes ___ Lw por i mp mee Jo xu coo _ ____ EN data R e020 interrupt signal ____ 5 PWRSW ONOFFmontopowe 16 sa H liCBuDaa 18 96 H External Memory Write Enable ____ DDC GND Detect Dsub cable plug in Beck Gack mace d Een eer P EA Eme 3 iue Ema 5 o _Hlih orderaddres b
13. and 1007 pin 1 9 being outputted from 1306 pin 177 OK 2 C015 C018 open gt Proceed section 11 Checking the open Ok operation of CPU 5 R051 R052 failure Ok v p Failure point Is the input waveform amplified by 007 being outputted Printed wire broke between 1306 pin 17 and 1008 pin 1 v LNG gt Failure point OK 1007 failure Failure point 1 C039 short 2 1008 failure Is the output waveform of 1007 pin 4 6 being inputted to 012 2 3 Failure point NG gt 0K 1 Printed wire broke between 1007 pin 4 6 and P012 pin 2 3 2 C016 C017 open y 3 C016 C017 failure Failure point 1 Speaker cable disconnection 2 Speaker failure Page 16 Trouble Shooting LITE U170ATA 1 Recommended Parts List Note 1 components identified by mark are critical for X ray safety Replace these with only the same parts specified 2 There is only OTP IC at the model beginning FPR stage or before When it put in mass production and there must be Mask coming out If you have spart parts need please use BOM to get the last release part number and related information Recommended Spare Parts List Page 1 JB dp LITE U170ATA Page 2 Recommended Spare Parts List LITE LITE ON TECHNOLOGY CORP 5 F No 16 Sec 4 Nanking E Road Taipei Taiwan Tel 886 2 25706999 Fax 886 2 25706888 URL www liteontc com tw Printed in Taiwa
14. e point 1 Inverter cable disconnection 2 Inverter of LCD module failure Trouble Shooting Page 5 U170ATA 4 Abnormal screen Check the R G B video signal from computer input on D Sub R G B connector Failure point OK NG gt 1 No R G and B video signal output from host computer Check computer 2 Video signal cable disconnection Check the R G B input signals on 1315 pin E1 D2 C1 respectively that their level is 0 7Vp p maximum Failure point In the case of the Red signal A Green and Blue signal is the same oK NG gt path too 1 Printed wire broke between D Sub R and 1315 pin E1 2 R339 short 3 C359 open v 4 R337 open Is the pulse ofthe TTL level being output to 1319 1320 from the data line of 1315 Failure point OK NG gt 1 Printed wire broke between 1315 data line and 1319 1320 2 1315 failure Check the negative horizontal sync pulse output to RN314 pin 8 from 1315 pin F20 at TTL level Failure point NG gt 1 Printed wire broke between 1315 pin F20 and RN314 pin 8 OK 2 1315 failure v Check the negative vertical sync pulse output to RN314 pin 7 from 1315 pin F19 at TTL level Failure point NG P OK 1 Printed wire broke between 1315 pin 73 and RN314 pin 7 2 1315 failure
15. eed Checking the operation of CPU Page 12 Trouble Shooting LITE U170ATA 10 Checking the DC DC converter circuit Check if the 5V is output from 1322 2 Printed wire broke between 1322 pin ox NG 1 and L314 pin 2 v Check the output of 3 3V line voltage from 1323 pin 2 Is the output FB335 being inputted ec gt to 1315 pin 3 L NG Failure point OK OK Printed wire broke between 1323 pin 3 and output of FB335 v Failure point 1323 failure v Failure poin Printed wire broke between 1323 pin 2 and IC 315 power supply pin Trouble Shooting Page 13 LITE 11 Checking the operation of CPU U170ATA Is there 45 0V supply on 1302 pin 44 og p Failure point Printed wire broke between output of 28331 and 1302 power supply pin Is 24MHz clock input to 1302 pin 20 and 21 at TTL level op 15 gt Failure point X301 failure v Check the input of 5V pulse from 1302 pin 10 are same as 1306 pin 1 LNG Failure point 1 Printed wire broke between 1302 pin 10 and 1306 pin 1 2 1208 failure 1302 failure Page 14 Trouble Shooting LITE U170ATA 12 Checking the audio circuit 15 a cable with the host PC connected NG Failure point Audio cable di
16. eset System reset is performed by detecting the rising and falling of the 5V source voltage at I301 5 2 LED control circuit Green amber is lit with the control signal of the LED GREEN and LED AMBER signal pin 15 12 from 1306 Circuit diagram MAIN PWB 2 8 6 EPROM for PnP Circuit diagram MAIN PWB 4 10 Circuit Description Page 1 LITE U170ATA 7 E7PROM Circuit diagram MAIN PWB 3 10 Data transfer between 1305 AT24 C16 and CPU Circuit diagram MAIN PWB 2 8 1302 is effected through the IIC bus SCL pin 15 and SDA pin 16 of 1302 The data to be transferred to each device are stored in 1305 e 1315 control data e OSD related setting data Other control data for service menu 8 CPU circuit Circuit diagram MAIN PWB 3 10 1302 87C51RD2 functions as the CPU The source voltage for the device is 5 0V and the system clock frequency is 24MHz 8 1 Detection of POWER switch status The CPU identifies the ON status of the two power supplies The identification is made when the power supply is turned off For example if the power supply is turned off with the POWER switch the POWER switch must be turned on when activating the power supply again If the power supply is turned off by pulling out the power cord then this power supply can be turned on by connecting the power cord without pressing the POWER switch 8 2 Display mode identification 8 2 1 Functions 1 Display mode identification The display mode of inpu
17. in DDC2 mode 2 The video cable may have failed or may not to have connections for DDC 3 Between 1312 pin 6 and 304 pin 15 may have failed 4 Between 1310 pin 6 and P303 pin 6 may have failed 5 R335 R326 open 6 Cable failure Trouble Shooting Page 9 U170ATA 7 Checking the interface circuit of sync signal 7 1 Checking the control circuit of horizontal sync pulse Check the horizontal sync signal on 1315 pin L2 TTL level Failure point NG 1 Video cable may have failed 2 Printed wire broke between P304 pin 13 OK and 1315 pin L2 3 FB305 R329 open 4 R330 C352 short Process Checking the resolution change IC movement section 7 2 Checking the control circuit of vertical sync pulse Check the vertical sync signal on 1315 pin K1 TTL level Failure point NG 1 Video cable may have failed OK 2 Printed wire broke between P304 pin 14 and 1315 pin K1 3 FB328 FB304 open 4 R331 C353 short v Process Checking the resolution change IC movement section Page 10 Trouble Shooting LITE U170ATA 8 Checking the resolution change IC movement 15 there 43 3V supply on 1315 pin 013 015 016 E17 G17 J17 L17 N17 R17 017 U15 U13 U12 010 U8 U6 U5 T4 L4 B2 86 B7 B8 B9 B11 C3 D3 E3 F2 F4 61 63 H1 J 1 J3
18. n
19. sconntction OK v Aren t the setups of the host PC a minimum and off LNG Failure point oK The setup of the host PC is changed e v Is correct output waveform bei inputted from pin 2 3 of host PC LNG Failure point Ok Audio cable disconntction Is the waveform which is the same as JK011 being inputted to 1006 pin 2 29 L NG Failure point 1 Printed wire broke between JK011 pin 2 3 and 1006 pin 2 29 Ok 2 R047 R048 open 3 R049 R050 short 4 C062 C063 open v 15 output wavefrom being outputted in 1006 pin 9 22 18 gt is 9V supplied to 1006 pin 10 5 19V supplied to 1008 pin 2 i Failure point QNG Proceed section 10 Checking the Ok DC DC converter circuit 1006 failure v b Trouble Shooting Page 15 LITE U170ATA b Y PE y Is the output waveform which is the Is the H signal of the TTL level same gs being inputted to 1008 pin 1 inputted to 1007 pin 1 97 g np pe LNG gt Failure point 15 the H signal of the TTL level 1 Printed wire broke between 1006 pin 9 22
20. t signal is identified based on Table 1 When the mode has been identified through the measurement of horizontal and vertical frequencies the total number of lines is determined with a formula of Horizontal frequency Vertical frequency Total number of lines identification can be made by examining the coincidence of the obtained figure with the number of lines for the mode identified from the frequency The boundary number of lines in each mode 15 shown in Table 2 When the detected frequency if the sync signal has changed the total number of lines should be counted even through it is rge identified frequency in the same mode 2 Power save mode This power save mode is assumed when the frequency of the horizontal vertical signal is as specified below e Vertical frequency 50 86 Hz e Horizontal frequency 24 92 KHz e VTOTAL 1200 or more 3 Power save mode The power save mode is assumed when the horizontal vertical signals are as specified below e Ifthere 15 no horizontal sync signal input e Ifthere 15 no vertical sync signal input e Ifthe horizontal sync signal is outside the measuring range of gm5020 e If the vertical sync signal is outside the measuring range of gm5020 Page 2 Circuit Description LITE Table 1 Mode Resolution H freq Band Width Polarity KHz MHz H V 1 VGA 720x400 70Hz 3
21. used when the user changes the parameters in order to modify the respective setting values Whether the switch has been pressed is identified with the switch input level that is turned L Each switch input port is pulled up at outside of ASIC Each parameter is stored in the EEPROM the contents of which are updated as required Page 4 Circuit Description LITE U170ATA 8 4 Control of definition converter LSI I315 8 4 1 Ports related to control gmZanl interrupt signal o HCLK gmZan serial clock P3 P4 HDATA gmZanl serial data E E HFS serial select 8 4 2 Functions Major function of I315 are as follows 1 Expansion of the display screen 2 Timing control for various signal types 3 Power supply sequence LCD panel 8 5 PC bus control 8 5 Related ports of 1302 8 5 2 PC controlled functions The following functional controls are effected by PC 1 Control of EEPROM 1305f for parameter setting 2 Control of audio preamplifier Circuit Description Page 5 LITE U170ATA 8 6 Power ON sequence When the POWER switch is pressed the POWER OFF signal is turned H When this H potential is detected the CPU begins to establish the respective power supplies according to the sequence shown below POWER gt 4 85ms LED __ gt 670ms LVCC 5 Audio EN gt 520ms lt Panel_VCC Lj A gt 4 50 ms PCLK DATA T
22. yte alo _Hlsh orderaddressbyie __ Ems x an Ema Am byte Ems A8 Hlih orderaddres ye __ Eme 3 An Hlish orderaddressbyie Emo 3 As Hlish orderaddressbyie x mw H Pemmsoeewbe ate 28 REESE a a EET EAA Eterna Access Emile s pruss ON H USB HUB power Enable onion new 1 oTe os s pavo _Ausiosuspend Erbe oa 9 W ws 79 DxLEDAMBER L ___ 4 p merne is or 2 oo 5 boraner rw n fe 560 12 21 U170ATA Page 8 Circuit Description LITE U170ATA Table of Contents 1 No display of screen Screen is black color of LED is amber 1 2 Nothing displays on screen Screen is black color of LED is green 2 3 Checking the back light unit 5 4 Abnormal screen 6 5 Abnormal Auto adjustment

Service Manual - Linfotech.co.uk

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