LG L1734S Service Manual Download Page 17 | Manualshive

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LG L1734S Service Manual Download Page 17

17

TROUBLESHOOTING GUIDE

No Power

(Power Indicator Off)

Please reinsert and
make sure the AC of
90-264v is normal

Measure C423 (+)
=1.8V
U404 PIN2=3.3V

Check the Adapter/Inverter
section

Check CN404 or replace
Q409, Q410, and U404

1. NO POWER

Check X401 oscillate
waveforms are normal

Replace U401

http://www.wjel.net

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Summary of Contents for L1734S

Page 1: ...w LGservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL L1734S L1734S BNT SNT AxxAQPH AxxBQPH xx sales marketing Mstar scaler CPT Module To apply the MSTAR Chip h t t p w w w w j e l n e t ...

Page 2: ...ating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution D sub Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 0 8A 5 2 Power Consumption 6 ENVIRONMENT 6 1 Operating Temperature 10 C 35 C Ambient 6 2 Relative Humidity 10 80 Non condensing 6 3 MTBF 50 000 HRS with 90 Confidence Lamp Life 50 000 Hours Min 7 DIMENSIONS with TILT SWIVEL Width 37 44 mm 14 74 inchs Dept...

Page 3: ...odule from the ESD as it may damage the electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the module If the surface of panel become dirty please wipe it o...

Page 4: ...ound lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged...

Page 5: ...der melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coating to the area...

Page 6: ...ute the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on the component s...

Page 7: ...628 600 1 4 23 800 x 600 H Pixels 46 875 1056 800 16 80 160 6 V Lines 49 5 75 0 625 600 1 3 21 800 x 600 H Pixels 49 725 1152 832 32 64 224 7 V Lines 57 2832 74 553 667 624 3 3 37 832 x 624 H Pixels 48 363 1344 1024 24 136 160 8 V Lines 65 0 60 0 806 768 3 6 29 1024 x 768 H Pixels 60 023 1312 1024 16 96 176 9 V Lines 78 5 75 029 800 768 1 3 28 1024 x 768 H Pixels 68 681 1456 1152 32 128 144 10 V L...

Page 8: ...t 2 Pull out the hinge cover as arrow direction 3 Remove the four screws 4 Put the front cover upward Then let the all latches are separated 5 Put the front face down disassembly back cover 6 Pull the key board out of bezel h t t p w w w w j e l n e t ...

Page 9: ...9 7 Disassembly the bezel 8 Disassembly the connector and screw 9 Remove the screw 10 Disassemble the LVDS cable 11 Main board and power board 12 The panel h t t p w w w w j e l n e t ...

Page 10: ... 2 ea Latches to inside until losing elasticity 2 Consequently pull the stand body directly 3 Separate Stand Body Stand Base 4 Fix Stand Base Stand Body 5 Remove the three screws 6 Separate the hinge and stand h t t p w w w w j e l n e t ...

Page 11: ...11 BLOCK DIAGRAM TSUM1PFR h t t p w w w w j e l n e t ...

Page 12: ...ircuit PWM control IC MOSFER OVP protect circuit Diode rectifier Starting resistor 12V Rush prevention ON OFF DIM Push pull circuit Transformer conversion LC resonance VDDA ON OFF circuit PWM IC OZ9938GN Feedback circuit OVP circuit 4 CCFL lamps Sampling Lamp open protection DIM circuit 12V 5V 100 240V h t t p w w w w j e l n e t ...

Page 13: ...puts 8 bit R G B signal to transmitter 2 Power Part This part consists of the one 3 3V and one 1 8V regulators to convert power which is provided 5V in Power board 12V is provided for inverter 5V is provided for LCD panel Also 5V is converted 3 3V and 1 8V by regulator Converted power is provided for IC in the main board The inverter converts from DC 12V to AC 700Vrms and operates back light lamps...

Page 14: ...ary through a power transformer 4 Output rectifier and filter This part function is to make a pulse width modulation control and to provide the driver signal to power switch to adjust the duty cycle during different AC input and output loading condition to achieve the dc output stabilized and also the over power protection is also monitor by this part 5 Photo Coupler isolation This part function i...

Page 15: ... EDID Write Run D20FNL EXE And choose 1 to write choose panel type if you get the right panel type the you can go to the next step If not the panel type loop will continue For example your monitor use the CMO Panel then you should assure a certain digit usually the sixteenth or seventeenth digit for LG of your input panel check number is q or Q input serial NO For LG the number of SN is 12 So inpu...

Page 16: ...gain and offset value c AGING Select Aging mode on off d PANEL used panel type e NVRAM INIT EEPROM initialize 24C08 f R G B 9300K Allows you to set the R G B 9300K value manually g R G B 6500K Allows you to set the R G B 6500K value manually h R G B Offset Allows you to set the R G B Offset value manually Analog Only i R G B Gain Allows you to set the R G B Gain value manually Analog Only Figure 1...

Page 17: ...make sure the AC of 90 264v is normal Measure C423 1 8V U404 PIN2 3 3V Check the Adapter Inverter section Check CN404 or replace Q409 Q410 and U404 NO NO YES YES 1 NO POWER Check X401 oscillate waveforms are normal Replace U401 Replace X401 NO YES h t t p w w w w j e l n e t ...

Page 18: ...04 PIN 3 5V Check power board and find out a short point as penning each power line 1 Check U404 2 Check C426 C427 Check C423 1 8V 1 Check Q409 Q410 2 CheckC432 C423 3 TROUBLE IN SCALER IC Check CN701 PIN1 5V Check BL ON OFF pulse as contacting scope NO NO NO NO YES YES YES YES h t t p w w w w j e l n e t ...

Page 19: ...2 2 Check X401 3 TROUBLE IN SCALER IC SCALER PIN1 2 OSCILLATES AS 14 318MHZ No Raster OSD Is Not Displayed SCALER IC PIN16 H SYNC PIN17 V SYNC CHECK CONNECTION LINE FROM D SUB TO SCALER TROUBLE IN CABLE OR LCD MODULE NO YES YES NO h t t p w w w w j e l n e t ...

Page 20: ...20 4 TROUBLE IN DPM TROUBLE IN DPM SCALER IC PIN16 H SYNC PIN17 V SYNC CHECK H V SYNC LINE TROUBLE IN CABLE OR LCD MODULE NO YES h t t p w w w w j e l n e t ...

Page 21: ...oltage for the pin1 of IC901 Check IC901 pin 7 Vcc is 13v Check AC line Check F901 BD901 Check D905 R934 R928 IC901 Check D902 C907 Check IC901 T901 D907 D908 ZD903 ZD902 ZD901 IC902 IC903 NO YES YES NO YES NO YES NO Check IC901 PIN6 output is PWM Check D901 Q903 ZD904 NO h t t p w w w w j e l n e t ...

Page 22: ...rt time Check Q805 Q806 pin5 pin8 is 12V Check PT801 PT802 pin7 pin8 650V Check power section Check Interface section or main board Check Q801 Q802 Q803 ZD801 Check IC801 pin 5 pin6 Cut all the pin connector of Q805 Q806 check C811 12V Unplug backlight connector wire check PT801 PT802 pin7 pin8 650V Check Q801 Q802 Replace PT801 PT802 Replace backlight NO NO NO NO NO YES YES YES h t t p w w w w j ...

Page 23: ...23 WIRING DIAGRAM 89G 76J 8525 89G179J30N587 95G 825 7W503 h t t p w w w w j e l n e t ...

Page 24: ...24 EXPLODED VIEW h t t p w w w w j e l n e t ...

Page 25: ...e 8J4 8H4 060 A15G0332101 MDQ48193201 MAIN FRAME 070 A34G0569 B6 1B0100 ACQ55931001 REAR COVER 080 A37G0061 2 AGU55931101 HINGE ASS Y 090 A34G0566 B6 1B0132 MCK48194001 STAND COVER 100 A33G0317 B6 1L0100 MCK48193401 HINGE COVER 110 A34G0565 B6 1B0100 MCK48193801 STAND NECK 120 A34G0567 B6 1B0132 MCK48194201 BASE 130 89G179J30N587 COV30014001 LVDS FFC CABLE 140 89G 728GAA 2G COV30014101 SIGNAL CABL...

Page 26: ...5 MLCC 0402 0 1UF K 16V X5R C413 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C409 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C407 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C406 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C404 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C403 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C401 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C412 065G0402220 31 CHIP 22PF 50V NPO C411 065G040...

Page 27: ... 1 16W R402 061G0402000 RST CHIPR 0 OHM 5 1 16W R401 061G0402000 RST CHIPR 0 OHM 5 1 16W R411 061G0402101 RST CHIPR 100 OHM 5 1 16W R412 061G0402101 RST CHIPR 100 OHM 5 1 16W R413 061G0402101 RST CHIPR 100 OHM 5 1 16W R418 061G0402101 RST CHIPR 100 OHM 5 1 16W R419 061G0402101 RST CHIPR 100 OHM 5 1 16W R424 061G0402101 RST CHIPR 100 OHM 5 1 16W R442 061G0402101 RST CHIPR 100 OHM 5 1 16W R451 061G0...

Page 28: ... R414 061G0402121 RST CHIP 120R 1 16W 5 R410 061G0402121 RST CHIP 120R 1 16W 5 R409 061G0402203 RST CHIP 20K 1 16W 5 R105 061G0402222 RST CHIPR 2 2 KOHM 5 1 16W R106 061G0402222 RST CHIPR 2 2 KOHM 5 1 16W R109 061G0402390 0F RST CHIP 390R 1 16W 1 R403 061G0402390 0F RST CHIP 390R 1 16W 1 R427 061G0402392 RST CHIP 3 9K 1 16W 5 R428 061G0402392 RST CHIP 3 9K 1 16W 5 R435 061G0402472 RST CHIPR 4 7 KO...

Page 29: ...C932 065G0603102 32 1000PF 10 50V X7R C836 065G060347141J W CAP CHIP 0603 470PF J 100V NPO C835 065G060347141J W CAP CHIP 0603 470PF J 100V NPO C834 065G060347141J W CAP CHIP 0603 470PF J 100V NPO C833 065G060347141J W CAP CHIP 0603 470PF J 100V NPO C813 065G0805102 31 1000PF 50V NPO C812 065G0805102 31 1000PF 50V NPO C910 065G0805103 32 10NF 50V 0805 X7R C807 065G0805103 32 10NF 50V 0805 X7R C904...

Page 30: ...1T GP CERAMIC CAP C931 065G 2K152 1T GP CERAMIC CAP C930 065G 2K222 2T6921 CAP CER 2200PF K 2KV Y5P C907 067G 5152207HT CAP 105 22UF M 50V C922 067G215D4713KT 105 EC 470UF M 16V KINGNICHI C925 067G215S10915T3964 EC CAP 1 0uF 450V 8 11mm DIODEs BD901 093G 50460 38 BRIDGE KBJ408G 4A 800V KBJ D908 093G3006 1 1 31DQ06FC3 NIHON INTER D907 093G 60267 SP10100 D807 093G 6432S IN4148W D808 093G 6432S IN414...

Page 31: ...2 RK7002 Q811 057G 759 2 RK7002 Q812 057G 759 2 RK7002 Q806 057G 763 6 AO4828L Q805 057G 763 6 AO4828L Q903 006G 31502 1 5MM RIVET RESISTORs NR901 061G 58005 W RST NTCR 5 OHM 3A THINKING R937 061G0805102 RST CHIPR 1KOHM 5 1 8W R926 061G0805102 RST CHIPR 1KOHM 5 1 8W R922 061G0805102 RST CHIPR 1KOHM 5 1 8W R921 061G0805102 RST CHIPR 1KOHM 5 1 8W R843 061G0805102 RST CHIPR 1KOHM 5 1 8W R836 061G0805...

Page 32: ...754 RST CHIPR 750 KOHM 5 1 8W JR801 061G1206000 RST CHIPR 0 OHM 5 1 4W JR902 061G1206000 RST CHIPR 0 OHM 5 1 4W JR823 061G1206000 RST CHIPR 0 OHM 5 1 4W JR820 061G1206000 RST CHIPR 0 OHM 5 1 4W JR802 061G1206000 RST CHIPR 0 OHM 5 1 4W R933 061G1206101 100 1206 R932 061G1206101 100 1206 R931 061G1206101 100 1206 R930 061G1206101 100 1206 R916 061G1206101 100 1206 R906 061G1206101 100 1206 R912 061G...

Page 33: ...152M51852T RST MOFR 0 51 OHM 5 2WS TRANSFORMER PT802 080GL17T 40 DN X FMR TK 2001U 101 PT801 080GL17T 40 DN X FMR TK 2001U 101 T901 080GL22T 2 LS X FMR 510uH PAO7001EL0 0 T901 006G 31502 1 5MM RIVET PT802 006G 31502 1 5MM RIVET PT801 006G 31502 1 5MM RIVET OTHERs CN801 033G8021 2E AC WAFER CN802 033G8021 2E AC WAFER CN803 033G8021 2E AC WAFER CN804 033G8021 2E AC WAFER CN901 087G 501 32 DL AC SOCK...

Page 34: ..._ID Volume Mute CMVCC PA 4 9 CMVCC1 VCTRL 05 Power on_BACKLIGHT Adj_BACKLIGHT VCC1 8 CMVCC VCC3 3 Mute Volume PANEL_ID DSUB_5V CMVCC1 VCTRL ESD_VCC TSUM1PFR LF SCHEMATIC DSUB_5V VCC3 3 VCC3 3 VCC1 8 VCC1 8 CMVCC PA 0 1 PB 0 9 02 Input DSUB_R DSUB_G DSUB_B DSUB_V DSUB_R DSUB_G DSUB_B DET_CABLE DSUB_H DSUB_SOG DDC1_SDA DDC1_SCL DSUB_5V CMVCC1 VCC3 3 ESD_VCC CMVCC1 CMVCC1 04 Output CMVCC PB 0 9 PA 0 ...

Page 35: ...S 1 2 3 4 5 6 I O1 GND I O2 I O3 VDD I O4 DSUB_SCL C105 0 047uF U103 AZC099 04S 1 2 3 4 5 6 I O1 GND I O2 I O3 VDD I O4 V_Sy nc C104 5pF 50V R109 390 OHM 1 16W VGA_G VGA_R FB102 BEAD 1 2 DDC1_SCL VGA_G C113 0 047uF DSUB_G 5 ESD_VCC DGND VGA_PLUG R103 100R 1 16W 5 R101 0R05 1 10W 5 R118 1K 1 16W 5 H_Sy nc R105 2K2 1 16W 5 R114 100R 1 16W 5 R107 75R 1 16W 5 ESD_VCC 7 VGA_G VGA_R VGA_B DSUB_H 5 VGA_R...

Page 36: ... LVA2P LVA2M LVA1P LVA1M LVA0P LVA0M LVB3P LVB3M LVBCKP LVBCKM LVB2P LVB2M LVB1P LVB1M LVB0P LVB0M LVA3M LVA3P GND AVDD_ADC MODE 1 MODE 0 VCTRL VDDC DDCA_SDA RS232_TX DDCA_SCL rs232_RX PWM0 GPIO_P26 GPIO_P15 PWM0 GPIO_P27 PWM1 GPIO_P12 GPIO_P00 SAR1 GPIO_P01 SAR2 GPIO_P06 GPIO_P07 GPIO_P13 GPIO_P14 GPIO_P11 I2C_MDA GPIO_P10 I2C_MCL RST VDDP VDDC GND RSTN GND U402 SST25VF010A 33 4C SAE 1 2 3 4 5 6 ...

Page 37: ... 16W 5 G PA8 R434 330 OHM 1 4W 3 PB 0 9 R435 4K7 1 16W 5 PA 4 9 5 C419 0 1uF 16V PA7 PB1 PA1 PA0 PB9 PB3 PA1 PA5 PA 0 1 5 PA4 S AO3401L PA 4 9 PB0 PB6 PA8 PB3 CN403 CONN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 PB4 PB8 PA 0 1 PB8 PA0 PB0 PA4 PB4 PB6 PA9 PB 0 9 5 PPWR_ON 5 R433 10K 1 16W 5 PB2 Q405 AO3401 D h t t p w w w w j e l n e t ...

Page 38: ...437 10K 1 16W 5 C425 NC VCC3 3 4 5 DSUB_5V 4 R442 100R 1 16W 5 VCC3 3 DSUB_5V C426 100uF25V R441 1K 1 16W 5 VCC3 3 C_PANEL_INDEX BKLT VBRI CMVCC Mute CMVCC1 Mute 5 CMVCC1 C432 0 1uF 16V VCC3 3 Q410 KN2907AS Q406 2N3904S RTK PS R450 NC NC CMVCC ESD_VCC 4 R449 NC VCC3 3 CMVCC1 5 Volume D403 BAT54C 3 1 2 CMVCC U404 AP1117D33LA 1 2 3 ADJ GND VOUT VIN PANEL_ID 5 R439 10K 1 16W 5 VCC3 3 Volume R440 4K7 ...

Page 39: ...5200 0F 200Ω 1 1 8W Q802 PMBS3904 57G 417 4 OPT3 R817 20K 1 8W 61G0805200 2F C832 0 1uF 0805 65G0805104 32 R805 470 1 4W 61G1206471 R814 750K OHM 1 8W 61G0805754 12V D812 1N4148W 93G 6432S R803 10KΩ 1 8W 61G0805103 R836 1KΩ 1 8W 61G0805102 Q807 RK7002 57G 759 2 C815 470uF25V 67T215P4714XV R828 4 7 K 1 4W 61G1206472 R842 5 1Ω 1 4W 61G1206519 DIM C830 1uF 25V 65G0805105 22 R829 61G1206820 82OHM 5 1 ...

Page 40: ...FB901 BEAD 71G 55 29 1 2 C923 1000uF M 16V 67G215S1023KV R933 61G1206101 D906 NC 1 2 3 ZD905 NC 1 2 R906 100Ω 1 4W 61G1206101 12V C900 3300pF 250V 65G306M3322BP C906 NC C912 65G0805152 32 R914 0 51 2W 61G152M51852T R902 680KΩ 61G1206684 D901 FR107 93G 6026T52T R937 1K 1 8W 61G0805102 R921 1KΩ 1 8W 61G0805102 D905 1N4007 93G 5212T52T GND D907 SP10100 93G 60267 1 2 3 D908 31DQ06FC3 93G3006 1 1 C915 ...

Page 41: ...Jan 2008 P NO Printed in China h t t p w w w w j e l n e t ...

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