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LG FLATRONL1753S, Service Manual

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LG FLATRONL1753S Service Manual Download Page 18

- 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

U201-#96

CHECK KEY CONTROL

CONNECTOR ROUTINE

CHECK U

2

01

NO

NO

CHECK  3.3V LINE

(OPEN CHECK)

CHECK 3.3V LINE

NO

CHECK X-TAL

YES

CHECK J

7

03

VOLTAGE

PIN5, PIN6 (5V)?

CHECK

U

6

01 PIN2 VOLTAGE

(3.3V) ?

IS U

2

01 

PIN

75

 (3.3V) 

VOLTAGE ?

CHECK U

2

01 PIN 

96

 

PULSE

1

YES

YES

YES

Summary of Contents for FLATRONL1753S

Page 1: ...NUAL Website http biz LGservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM57A MODEL L1753S L1753S FS A QP L1953S L1953S FS A QP To apply the MSTAR Chip Same model for Service ...

Page 2: ...cal 56 75Hz 4 Max Resolution D sub Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 0 6A 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 TILT SWIVEL L1753S Width 364 5 mm 14 35 Depth 180 mm 7 09 Height 378 2 mm ...

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: ... 8 Monitor on the pad Pull up the stand part Separate head stand 2 3 4 2 Hold the head stand base and then Twist Stand until Click 4 1 5 Soft pad on the table 1 DISASSEMBLY Set ...

Page 9: ... 9 Remove the screws Disassemble back cover 6 8 1 Pull the front cover upward 2 Then let the all latches are separated 3 1 3 2 3 Put the front face down 9 7 ...

Page 10: ...LY Stand Push the four latches on the bottom to the outside and Separate Stand Body Base Reference the 1 2 After finished repair necessarily push 4ea Latches to inside for restoration 1 1 In case of Latch 4 1 2 2 3 ...

Page 11: ...ISASSEMBLY Stand Hold the stand body Confirm two latch of right and left Push the latch to the inside Push the base to the opposite direction 1 2 3 Confirm the condition of separation 5 4 In case of Latch 2 ...

Page 12: ... E 1 S D V L B G R g o l a n A b u S D l o r t n o C y e K o T V 5 V 3 3 r o t a l u g e R r o t a l u g e R V 3 3 V 8 1 n o i s r e v C D O y l n o B G R l a t i g i D D I V D r e t r e v n I r e t r e v n I r e t p a d A V 8 1 S D M T S D M T U C M U C M C D A C D A r e l a c S r e l a c S L L P L L P D S O D S O V 2 1 y r o m e m h s a l F y r o m e m h s a l F ...

Page 13: ...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 13V 5V Inverter On OFF 3 3V Dimming Lamp Current Control Aux Drive Start Module Vcc Main Board Scaler DC DC converter 12V 5V ...

Page 14: ...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 15: ...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 16: ... 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 17: ...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 18: ...RT POINT AS OPENING EACH POWER LINE NO PROBLEM 1 Waveforms U201 96 CHECK KEY CONTROL CONNECTOR ROUTINE CHECK U201 NO NO CHECK 3 3V LINE OPEN CHECK CHECK 3 3V LINE NO CHECK X TAL YES CHECK J703 VOLTAGE PIN5 PIN6 5V CHECK U601 PIN2 VOLTAGE 3 3V IS U201 PIN75 3 3V VOLTAGE CHECK U201 PIN 96 PULSE 1 YES YES YES ...

Page 19: ...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 J703 PIN5 PIN6 5V J703 PIN9 5V J703 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 20: ...CHECK C509 C510 SOLDERING CONDITION 2 CHECK X501 3 TROUBLE IN U201 CHECK CONNECTION LINE FROM D SUB TO U201 U201 PIN96 97 OSCILLATE AS 14 31MHZ U201 PIN27 IS 48KHz H SYNC PIN28 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms U201 96 97 U201 27 H SYNC 2 U201 28 V SYNC YES YES YES U201 PIN 16 75 3 3V ...

Page 21: ...ROUBLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN U201 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE CHECK R730 R731 CHECK U201 PIN 27 28 SYNC PULSE 3 3 Waveforms R442 H Sync 3 R443 V Sync YES YES ...

Page 22: ...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 23: ...302 Check 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 3V Check U301 Pin12 SSTCMT Less than 1V Check U303 U304 Drain waveform YES YES YES NO ...

Page 24: ... 22 WIRING DIAGRAM 11P 6P 3P 30P 6631900011H 6631T20023J EAD37414501 17 EAD37413101 19 6631T20010E ...

Page 25: ...010 020 040 150 160 170 050 060 070 080 090 100 110 030 130 140 EXPLORE VIEW ...

Page 26: ...280X1024300CDCOLOR72 5 4800 15MS 160 160 2CH LVDS 4LAMPAUOPTRONICSCORP EAJ36378001 LCD Module TFT LM170E03 TLL1DRIVER17 0INCH1280X1024300CDCOLOR72 4 3800 1P5 5ms 160 160 TLIT con Lusem Toshba Source Gate Diffuser 2 Prism 1 lampwire135mmLGPHILIPSLCD LOR72 4 3800 1P7 5ms 160 160 TLIT con Lusem Toshiba Source Gate lampHeesung Diffuserx2 P ACQ33170001 Cover Assembly L1753S Baikal CI model 17 Back Cove...

Page 27: ... 160 2CH LVDS 4LAMP NON ZBDAUOPTRONICSCORP EAJ36380901 or EAJ36380801 LCD Module TFT LM190E08 TLL1DRIVER19 0INCH1280X1024300CDCOLOR72 4 3800 1P4 5ms 160 160 TLIT con Lusem Toshiba Source Gate lamp Heesung Diffuserx2 LC213x1 lampwire160mm depth15 5TLGPHILIPSLCD or EAJ36381001 LCD Module TFT LM190E08 TLL3DRIVER19 0INCH1280X1024300CDCOLOR72 4 3800 1P4 5ms 160 160 TLIT con Magna Toshiba Source Gate la...

Page 28: ... 33 SCHEMATIC DIAGRAM 1 SCALER ...

Page 29: ... 33 2 POWER WAFER ...

Page 30: ... 32 3 INVERTER ...

Page 31: ... 33 4 POWER 1 3 2 4 ...

Page 32: ...May 2007 P NO MFL30290843 Printed in China ...

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