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LG L1753HM, Service Manual, Page: 16 / 36

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LG L1753HM Service Manual Download Page 16

- 16 -

TROUBLESHOOTING GUIDE

1. NO POWER

NO POWER

(POWER INDICATOR OFF)

NO

CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING 
EACH POWER LINE

NO PROBLEM

1

Waveforms

U101-#96

CHECK KEY CONTROL

CONNECTOR ROUTINE

CHECK U

5

01

NO

NO

CHECK  3.3V LINE

(OPEN CHECK)

CHECK 3.3V LINE

NO

CHECK X-TAL

YES

CHECK J

905

VOLTAGE 

PIN5, PIN6 (5V)?

CHECK 

U

901

 PIN 

2 

VOLTAGE

(3.3V) ?

IS U

5

01 

PIN

87

 (3.3V) 

VOLTAGE ?

CHECK U

5

01 PIN 

127

 

PULSE

1

YES

YES

YES

Summary of Contents for L1753HM

Page 1: ...READ THE IN THIS MANUAL CHASSIS NO LM57B L1753H L1753H FS A QPN L1953H L1953H FS A QPN L1753HR L1753HR FS A QPN L1953HR L1953HR FS A QPN To apply the MSTAR Chip ...

Page 2: ...3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution D sub Analog 1280 x 1024 75Hz Digital 1280 x 1024 60Hz 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 50 F 95 F 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 TI...

Page 3: ... Protect the module 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 pl...

Page 4: ...st receiver ground 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 ...

Page 5: ...tip as the solder 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 coati...

Page 6: ...onnection 4 Route 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 t...

Page 7: ...ls 57 283 49 725 1152 832 32 64 224 832 x 624 V Lines 74 55 667 624 1 3 39 8 H Pixels 65 0 48 363 1344 1024 24 136 160 1024 x 768 V Lines 60 0 806 768 3 6 29 9 H Pixels 78 75 60 123 1312 1024 16 96 176 1024 x 768 V Lines 75 029 800 768 1 3 28 10 H Pixels 100 0 68 681 1456 1152 32 128 144 1152 x 870 V Lines 75 062 915 870 3 3 39 11 H Pixels 92 978 61 805 1504 1152 18 134 200 1152 x 900 V Lines 65 9...

Page 8: ... your hold on the product as it follows and turn the Stand Base in the arrow direction until you hear a click Pull out the Stand to remove 1 2 3 Remove the screws 1 Pull the front cover upward 2 Then let the all latches are separated 3 Put the front face down Disassemble back cover 4 5 6 ...

Page 9: ...ld the body of the Stand as it follows Press the two latches at the same time as it follows Pushing Latch inside Take the stand base from stand body The body of the Stand and the Stand Base are successfully separated 1 2 4 3 ...

Page 10: ...arACE LVDS Tx LVDS Analog R G B Digital D Sub DVI D LIPS Filter 5V 12V 5V 3 3V 1 8V Vcc 5V 5V Scaler MCU Intel8032 Inverter 4 lamps 12V Regulator KEY 3 3V 1 8V Line Buffer OSD SSC EEPROM System Module 3 3V SDA SCL 3 3V Flash ROM 12V EEPROM EDID ...

Page 11: ...trol IC P ch N ch Inverter Trans SMPS Lamp Current Feedback Over Voltage Protection Power Control IC Feedback Line Filter L N Drive Block 12V 12V 5V Inverter On OFF 3 3V Dimming Lamp Current Control Aux Drive Start Module Vcc Main Board Scaler DC DC converter 12V 5V ...

Page 12: ...n signal and outputs 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 DC12V to AC 700Vrms and operates b...

Page 13: ...DC voltage through a bridge rectifier and a bulk capacitor 3 Energy Transfer This part function is for transfer the primary energy to secondary 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 ach...

Page 14: ... is available to LCD Monitor only 1 Port Setup a Copy UserPort sys file to c WINNT system32 drivers folder b Run Userport exe c Remove all default number d Add 300 3FF e Click Start button f Click Exit button 2 EDID Read Write 1 Run WinEDID exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b Click Update button c Click Write button ...

Page 15: ...display 2 Wait for about 5 seconds and press MENU POWER switch with 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a Auto Color W B balance and Automatically sets the gain and offset value b NVRAM INIT EEPROM initialize 24C08 c CLEAR ETI To initialize using time d AGING Select Aging mode on off e R G B 9300K Allows you to set the R G B 9300...

Page 16: ...T POINT AS OPENING EACH POWER LINE NO PROBLEM 1 Waveforms U101 96 CHECK KEY CONTROL CONNECTOR ROUTINE CHECK U501 NO NO CHECK 3 3V LINE OPEN CHECK CHECK 3 3V LINE NO CHECK X TAL YES CHECK J905 VOLTAGE PIN5 PIN6 5V CHECK U901 PIN 2 VOLTAGE 3 3V IS U501 PIN87 3 3V VOLTAGE CHECK U501 PIN 127 PULSE 1 YES YES YES ...

Page 17: ...OARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK MICOM INV ON OFF PORT 1 CONFIRM BRIGHTNESS OSD CONTRL STATE 2 CHECK MICOM DIM ADJ PORT LIPS J905 PIN5 PIN6 5V J905 PIN9 5V J905 PIN10 5V CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE YES YES YES YES ...

Page 18: ...HECK C509 C510 SOLDERING CONDITION 2 CHECK X501 3 TROUBLE IN U501 CHECK CONNECTION LINE FROM D SUB TO U501 U501 PIN127 128 OSCILLATE AS 14 31MHZ U501 PIN32 IS 48KHz H SYNC PIN33 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms U201 96 97 U101 27 H SYNC 2 U101 28 V SYNC YES YES YES U501 PIN 58 57 3 3V ...

Page 19: ...ROUBLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN U101 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE CHECK R718 R719 CHECK U501 PIN 32 33 SYNC PULSE 3 3 Waveforms R332 H Sync 3 R333 V Sync YES YES ...

Page 20: ...e NO NO Check BD101 Check U101 Pin7 9 10V Check D102 Trouble in Q101 NO Trouble in D201 D202 YES CHECK Fuse F101 OK CHECK C101 Voltage AC110V 160Vdc AC220V 304Vdc CHECK U101 Pin6 Waveform Square wave Come out Check Q101 Drain Waveform Check D201 D202 D203 Voltage YES YES YES YES NO ...

Page 21: ...heck the waveform of U301 Pin1 15 Check the waveform of U301 Pin2 3 NO If waveform is no problem Check D302 D308 Or Trouble in U303 U304 YES CHECK P201 Pin9 3 3V Check U301 Pin2 5V Check U301 Pin6 VSEN Less than 1 8V Check U301 Pin12 SSTVMT CMP Less than 2 75V Check U303 U304 Drain waveform YES YES YES NO ...

Page 22: ... 22 WIRING DIAGRAM 11P 6P 3P 30P 6631900011H 6631T20023J 6631900109A 6631T20010E L1753HR 6631900125A L1953HR ...

Page 23: ... 23 EXPLODED VIEW 010 020 030 040 050 060 070 080 090 100 120 130 140 150 160 170 180 190 200 210 220 230 240 250 ...

Page 24: ...60 TLIT con Lusem Toshiba Source Gate Diffuserx2 Prismx1 lampwire135mmLGPHILIPSLCD EAJ36378001 LCD Module TFT LM170E03 TLL1DRIVER17 0INCH1280X1024300CDCOLOR72 4 3800 1P5 5ms 160 160 TLIT con Lusem Toshba Source Gate Diffuser 2 Prism 1 lampwire135mmLGPHILIPSLCD EAJ36380701 LCD Module TFT LM170E03 TLL3DRIVER17 0INCH1280X1024300CDCOLOR72 4 3800 1P5 5ms 160 160 TLIT con Magna Toshiba Source Gate Diffu...

Page 25: ... Gate lamp Heesung Diffuser x2 P EAJ36380801 LCD Module TFTLM190E08 TLL1 DRIVER 19 0INCH 1280X1024 300CD COLOR 72 4 3 800 1 P4 5ms 160 160 TLI T con Lusem Toshiba Source Gate lamp Heesung Diffuser x2 L EAJ36381001 LCD Module TFT LM190E08 TLL3 DRIVER 19 0INCH 1280X1024 300CD COLOR 72 4 3 800 1 P4 5ms 160 160 TLI T con Magna Toshiba Source Gate lamp Heesung Diffuser x2 L ACQ30234341 Cover Assembly L...

Page 26: ...ZBD DRIVER 17 0INCH 1280X1024 300CD COLOR 72 5 4 800 1 4MASK 5ms 160 160 BOE HYDIS TECHNOLOGY EAJ36378001 LCD Module TFT LM170E03 TLL1DRIVER17 0INCH1280X1024300CDCOLOR72 4 3800 1P5 5ms 160 160 TLIT con Lusem Toshba Source Gate Diffuser 2 Prism 1 lampwire135mmLGPHILIPSLCD EAJ36380701 LCD Module TFT LM170E03 TLL3DRIVER17 0INCH1280X1024300CDCOLOR72 4 3800 1P5 5ms 160 160 TLIT con Magna Toshiba Source...

Page 27: ...7001501 PCB Assembly CONTROL T T LM72A BAIKAL II 19 INCH BLUE RD 53 SERIAL 200 210 220 230 35509K0258A Cover LX52 HINGE R 35509K0259A Cover LX52 HINGE L HEIGHT STAND 35509K0257A Cover LX52 HINGE BODY HEIGHT STAND 240 MGJ30075901 Cover PRESS SBHG 1 0 SHIELD AL METAL SBHG 250 4940900022B Knob MAIN 5KEY LX52 TACK KNOB ADD SOURCE PRINTING 6410TPW003A Power Cord LP 33 GFC18N B90A LS 60_1 87M_BLK LP 33 ...

Page 28: ...6A 0603B104K160CT 100nF 10 16V C714 0CC680CK41A C1608C0G1H680JT 68pF 5 50V DATE 2007 01 27 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C715 0CC680CK41A C1608C0G1H680JT 68pF 5 50V C716 0CK104CF56A 0603B104K160CT 100nF 10 16V C717 0CK104CF56A 0603B104K160CT 100nF 10 16V C718 0CK104CF56A 0603B104K160CT 100nF 10 16V C719 0CK104CF56A 0603B104K160CT 100nF 10 16V C720 0CK104CF56A 0603B104K160CT 100nF 1...

Page 29: ... 10W R717 0RJ0752D677 MCR03EZPJ750 75OHM 5 1 10W R718 0RJ0682D677 MCR03EZPJ680 68OHM 5 1 10W DATE 2007 01 27 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R719 0RJ0682D677 MCR03EZPJ680 68OHM 5 1 10W R720 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W R721 0RJ0752D677 MCR03EZPJ750 75OHM 5 1 10W R722 0RJ0752D677 MCR03EZPJ750 75OHM 5 1 10W R723 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R724 0RJ4701D677 MCR03EZ...

Page 30: ...DES R TP SOT D402 0DSDI00038A BAV99 F LF DIODES R TP SOT D403 0DSDI00038A BAV99 F LF DIODES R TP SOT D404 0DSDI00038A BAV99 F LF DIODES R TP SOT D405 0DSDI00038A BAV99 F LF DIODES R TP SOT DATE 2007 01 27 S AL LOC NO PART NO DESCRIPTION SPECIFICATION D406 0DSDI00038A BAV99 F LF DIODES R TP SOT D407 0DSDI00038A BAV99 F LF DIODES R TP SOT D408 0DSDI00038A BAV99 F LF DIODES R TP SOT ZD101 0DZ330009CC...

Page 31: ...MC010A EFD 2124 95UH INVERTER TRANS T302 61709MC010A EFD 2124 95UH INVERTER TRANS SC101 6620K00020A HUAJIE AC UL CSA 3PPIN BLACK F101 0FZZTTH001E TIME LAG HBC 2153 15MXE LEAD FB101 6210TCE003G BRS3550B BO SUNG 3550MM RADI HS1 4920900021A EXTRUSION 10 20 16 LX52 HS2 4920900021A EXTRUSION 10 20 16 LX52 HS3 4920900022A PLATE 7 60 16 LX52 HS4 4920900032A PLATE 20 5 10 5 12 0 L202 61409B0009A HL 1520S ...

Page 32: ... 33 1 SCALER SCHEMATIC DIAGRAM ...

Page 33: ... 33 2 POWER WAFER ...

Page 34: ... 33 3 INVERTER ...

Page 35: ... 32 4 POWER ...

Page 36: ...May 2007 P NO MFL30290843 Printed in China ...

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