LG M1721A Service Manual Download Page 14 | Manualshive

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TROUBLESHOOTING GUIDE

- 14 -

No power

(LED indicator off)

Check short of main B/D

or Change Lips

Change IC903

Change LED Assy

Check 15V or 5V

of Lips

Check Output of

IC903

Check LED Assy

Check P901, P270,

Connector.

Fail

Fail

Change Q904

Check Output of

Q904

Fail

Pass

Pass

Fail

Pass

Pass

Pass

:[A]Process

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Summary of Contents for M1721A

Page 1: ...SERVICE MANUAL Website http biz LGservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LP68A MODEL M1721A M1721A BZH A OPP M1921A M1921A BZH A OPP Same model for Service ...

Page 2: ...min 85 typ 2 2 Luminance 180 min 250 typ 2 3 Contrast Ratio 3000 min 3 SIGNAL Refer to the Timing Chart 3 1 Analog Video Input 1 Video Input Range 0 0 7V 5 2 Video Termination Impedance 75Ω 5 3 Sync Type Separate Sync 4 Sync Level TTL Low 0 8V High 2 0V 3 2 Operating Frequency Horizontal 30 70kHz Vertical 56 75Hz 4 RESOLUTION Analog Max 1280 x 1024 60Hz 5 POWER SUPPLY 5 1 Power AC 100 240Vac 50 60...

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: ...t 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 c...

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: ...00 x 600 V Lines 75 0 625 600 1 3 21 7 H Pixels 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...

Page 8: ...DISASSEMBLY 8 Hold the stand body stand base 1 Let the all latches are separated 2 Disassemble back cover Separate body stand base Remove the screws 1 4 2 3 Disassemble Connector 5 ...

Page 9: ... Video Jack Stereo In Option H P Output LED IR Control Power Video Audio Data Address Data CLK DQM W EZ CASZ RASZ EEPROM 24C02 M12L16161A 5TG SDRAM CVBS Tuner CVBS Tuner SCL SDA SCL SDA SCL SDA SIF_OUT CVBS OUT MST96585 Scaler Video Decoder SCART Jack D Sub Option RS 232C Option Rx Tx CS4352 DAC 3 3V 12V Regulator Regulator Regulator Regulator Regulator 5V 1 8V LED IR Board Control MX232A RS 232C ...

Page 10: ...s Block Selects input Video signals like CVBS Y C SCART RGB and output LVDS TTL signal through Scaler On decoding We can control signal like Contrast Brightness Sharpness Color tint signals including Adaptive Comb Filter 2 Audio Decoder This block analyzes audio input signal through A V Jack and PC audio and Tuner SIF The analyzed signals transmitted to audio amplifier On decoding We can control s...

Page 11: ... 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 achieve the dc output s...

Page 12: ...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 If you don t write EDID check below 1 Enter SVC Menu refer 14page Enter Etc Enter Write Protect 1 EDID protection No write 0 EDID wirte...

Page 13: ... to enter SVC Menu 1 Push Adjust Key in SVC remote controller 2 Push Menu Key in remote controller over 5 seconds the while pushing Menu key of Local button If SVC OSD appear remove the finger on Menu Key in remote controller first of all Figure 1 Cable Connection 220 IBM Compatible PC PARALLEL PORT Power inlet required Power LED ST Switch Power Select Switch 110V 220V Control Line N o t u s e d R...

Page 14: ...r off Check short of main B D or Change Lips Change IC903 Change LED Assy Check 15V or 5V of Lips Check Output of IC903 Check LED Assy Check P901 P270 Connector Fail Fail Change Q904 Check Output of Q904 Fail Pass Pass Fail Pass Pass Pass A Process ...

Page 15: ...IC910 Check inverter Connector or inverter Check inputting source cable and jack Repeat A PROCESS Fail Change IC900 IC901 IC906 IC908 IC909 IC910 Fail Change IC100 Fail Change inverter connector or inverter Fail Change panel link cable or module Fail Check panel link Cable or module Pass Pass Pass Pass Pass B Process ...

Page 16: ...0 L801 Check the signal of R104 R106 R108 R131 L822 L800 L801 Repeat A Process Check the output of TU500 Check the input output of IC100 Check input source cable and jack Fail Fail Fail Fail Re solder or change the defect part Check X101 Check 5V of TU500 Re solder or change the defect part Pass Pass Pass Pass ...

Page 17: ...nput Check the input source Fail Pass Pass Pass Pass Re soldering or Change the defect part Check X301 Check the input output of IC100 Fail Re soldering or Change the defect part Check the input output of IC400 Fail Change speaker Check the speaker Fail ...

Page 18: ...WIRING DIAGRAM 18 30P 6631T900055A 5P 11P 6631T20038G 6631900042B EAB32761501 3P 6631900024D ...

Page 19: ...EXPLODED VIEW 19 300 510 440 120 200 530 520 430 500 174 410 400 900 920 910 930 420 ...

Page 20: ...721A 17LS5R BACK COVER ASSY RAVEN BLACK BB3 ANALOG ACQ31008309 Cover Assembly Rear M1921 CL 81 19 BACK COVER ASSY RAVEN BLACK BB3 analog MFT LPL TLL SET MEY32043301 Knob MOLD ABS HF 350 SUB 7 KEY M1921 M1721 ABS BLACK MGJ32111401 Plate Shield PRESS SBHG 0 6T METAL EGI M1721 INVERTER SHIELD MGJ32111102 Plate Shield PRESS SBHG 0 6T METAL EGI M1921 INVERTER SHIELD FOR LPL MODULE ADV31008019 Frame Ass...

Page 21: ...NO DESCRIPTION SPECIFICATION C157 0CK473CK56A C1608X7R1H473KT 47nF 10 50V C158 0CK473CK56A C1608X7R1H473KT 47nF 10 50V C159 0CK104CK56A 0603B104K500CT 100nF 10 50V C161 0CH5200K416 0805N200J500LT 20pF 5 50V C C162 0CH5200K416 0805N200J500LT 20pF 5 50V C C164 0CE106WFKDC MVK4 0TP16VC10M 10uF 20 16V C168 0CK225DH94A C2012Y5V225ZFT 2 2uF 20TO 8 C169 0CK225DH94A C2012Y5V225ZFT 2 2uF 20TO 8 C170 0CK225...

Page 22: ... 3 3uF 20 5 C742 0CE335WK6D8 MVK4 0TP50VC3 3M 3 3uF 20 5 C743 0CK104CK56A 0603B104K500CT 100nF 10 50V C744 0CE106WFKDC MVK4 0TP16VC10M 10uF 20 16V DATE 2007 01 30 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C745 0CE106WFKDC MVK4 0TP16VC10M 10uF 20 16V C746 0CC561CK41A C1608C0G1H561JT 560pF 5 50V C747 0CC561CK41A C1608C0G1H561JT 560pF 5 50V C748 0CE335WK6D8 MVK4 0TP50VC3 3M 3 3uF 20 5 C749 0CE335...

Page 23: ...T 8OHM 2X1 25X L262 6210TCE001A HB 1S2012 080JT 8OHM 2X1 25X L270 6210TCE001G HH 1M3216 501JT 500OHM 3 2X1 DATE 2007 01 30 S AL LOC NO PART NO DESCRIPTION SPECIFICATION L271 6210TCE001A HB 1S2012 080JT 8OHM 2X1 25X L400 6210TCE001G HH 1M3216 501JT 500OHM 3 2X1 L405 6210TCE001G HH 1M3216 501JT 500OHM 3 2X1 L406 6210TCE001G HH 1M3216 501JT 500OHM 3 2X1 L407 6210TCE001G HH 1M3216 501JT 500OHM 3 2X1 L...

Page 24: ...HM 5 1 10W R166 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W R167 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W DATE 2007 01 30 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R169 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R171 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R172 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R173 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R174 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R175 0RJ1000D6...

Page 25: ...3EZPJ000 0OHM 5 1 10W 1 R823 0RJ4703D677 MCR03EZPJ474 470KOHM 5 1 10 R824 0RJ4703D677 MCR03EZPJ474 470KOHM 5 1 10 R825 0RJ1002D677 MCR03EZPJ103 10KOHM 5 1 10W R826 0RJ0752D677 MCR03EZPJ750 75OHM 5 1 10W DATE 2007 01 30 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R827 0RJ1002D677 MCR03EZPJ103 10KOHM 5 1 10W R834 0RJ9101D677 MCR03EZPJ912 9 1KOHM 5 1 10 R835 0RJ9101D677 MCR03EZPJ912 9 1KOHM 5 1 10 ...

Page 26: ...H200 SMH200 600mM 2 00MM 5 LED500 0DLBE0138AA BL BUBGE301 ROUND 3MM SUPER P5000 6602T20009D SMAW200 05P 5P 2 00MM 1R ANG PA5000 6712SCA232A TSOP34838SO1 2 7TO5 5V 1 5MA C5000 0CH5101K416 C2012C0G1H101JT 100pF 5 50V C5001 0CH5101K416 C2012C0G1H101JT 100pF 5 50V C5002 0CH5470K416 0805N470J500LT 47pF 5 50V C C5003 0CH3104K566 0805B104K500CT 100nF 10 50V Q5001 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V Q...

Page 27: ... 27 SCHEMATIC DIAGRAM 1 MSTAR ...

Page 28: ... 28 2 PANEL CONNECTOR ...

Page 29: ... 29 3 SDRAM ...

Page 30: ... 30 4 AMP ...

Page 31: ... 31 5 TUNER ...

Page 32: ... 32 6 DVI VGA ...

Page 33: ... 33 7 SCART COMPONENT ...

Page 34: ... 34 8 ...

Page 35: ... 35 9 POWER ...

Page 36: ... 36 10 CONTROL ...

Page 37: ... 37 11 IR LED ...

Page 38: ...Jan 2007 P NO MFL36713661 Printed in Korea ...

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