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LG 20HIZ12 Service Manual Download Page 20

LGE Internal Use Only

Copyright © 2007 LG Electronics. Inc. All right reserved. 
Only for training and service purposes

- 19 -

No Sound

Check the speaker wire

Change source input

Check the 

input source

Fail

Pass

Re-soldering or 
Change the defect part
Check X11

Check the input/output 

of IC1

Fail

Pass

Re-soldering or 
Change the defect part

Check the input/output 

of IC100,IC101 

Fail

Pass

Change speaker

Check the speaker

Fail

Pass

Summary of Contents for 20HIZ12

Page 1: ......

Page 2: ...LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS ML 041F MODEL 20HIZ12 RZ 20LZ55C website http biz LGservice com Internal Use Only ...

Page 3: ... reserved Only for training and service purposes 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 10 SVC REMOCON 11 HOTEL MODE 12 TROUBLE SHOOTING 15 BLOCK DIAGRAM 20 WIRING DIAGRAM 22 EXPLODED VIEW 23 REPLACEMENT PARTS LIST 25 SVC SHEET ...

Page 4: ...ent failure Before returning the receiver to the customer always perform an AC leakage current check on the exposed metallic parts of the cabinet such as antennas terminals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug p...

Page 5: ...n your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge b...

Page 6: ...the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replac...

Page 7: ...un more than 30min 5 Adjusting standard for this chassis is followed a special standard SPECIFICATION NOTE Specifications and others are subject to change without notice for improvement 3 General Specification No Item Content Remark 1 LCD Module Feature Maker LPL Type TFT Color LCD Module Active Display Area 20 1 inches 510 00 duaginal Pixel Pitch mm 0 6375mm H x 0 6375mm V x RGB Electrical Interf...

Page 8: ... Dual BG I LL 14 DW Double Window Mode X 15 MW Multi Window Mode X 16 Film Mode X 17 Noise Reduction X 18 Progressive Scan 0 19 Motion Detection X 20 SRS WOW X 21 Swivel Speaker X 22 EZ pip X 23 ARC X 24 DRP X 25 DCDI X 26 HDCP X No Item Content Remark 1 Product Width W Length D Height H Dimension Before Packing 597 5 222 460 6 With Stand After Packing 702 288 547 2 Product Only SET 9 9kg Weight W...

Page 9: ... NTSC OPTION 9 Sound SSM Flat AVL Off Balance 0 10 Special Input TV Child Lock Off Auto Sleep Off Language English Area Management 8 Optical Character No Item Specification Remark LPL CMO AUO 1 Viewing Angle Right Left 88 88 80 80 80 80 CR 10 Up Down 88 88 70 70 60 60 2 Luminance Luminance cd m2 450 450 500 Typical Variation 1 3 MAX MIN 3 Contrast Ratio 350 500 500 All white All black 4 CIE Color ...

Page 10: ...25 PAL BG RED MONO BLN2 PR 12 55 75 PAL L Crosshatch MONO C 02 PR 13 152 75 PAL L PHILIPS NICAM DUAL S 07 PR 14 591 25 PAL L Colorbar NICAM STEREO C 48 LGEMA PR 31 175 25 PAL B Crosshatch Circle NICAM DUAL FLOF C 05 PR 32 711 25 PAL G DIGITAL NICAM STEREO FLOF C 51 PR 33 631 25 PAL I Crosshatch NICAM STEREO FLOF C 41 PR 34 93 25 SECAM D DIGITAL MONO C 05 PR 35 62 25 PAL B Crosshatch A2 STEREO C 04...

Page 11: ...nt Mode press VOL Key consecutively in Auto Gain Menu g g g g g g g g g g g g After adjustment is complete pressing enter key stores and completes the process 3 2 3 Low Gray Adjustment g g g g g g g g g g g g Apply Gray Level Model 202 PAL_BDGH pattern 59 signal by using Pattern Generator MSPG 925FS g g g g g g g g g g g g Check weather color coordinates x 0 283 y 0 298 0 005 is operated by using ...

Page 12: ...the adjustment mode To easily adjust the screen according to surrounding brightness To easily adjust sound according to the program type To check component input To check the front AV To move channel up down or to select a function displayed on the screen To adjust the volume or accurately control a specific function To set a specific function or complete setting To move the channel down in the PI...

Page 13: ...Change Possible or No Change Impossible when present source is TV When Channel Change is set to No Change Impossible Channel Key Numeral Key List Key Q View Key doesn t work and entering Channel Menu in the Main Menu OSD is impossible When Channel Change is set to Yes Change Possible Channel Key Numeral Key List Key Q View Key does work and entering Channel Menu in the Main Menu OSD is possible Wh...

Page 14: ...et user can change up to set volume value In the case of Fixed Volume is set to Yes Max Volume item cannot be selected When Max Volume is set volume just goes up to the Max Volume value in On Time Menu 1 6 OSD Display Decide to display OSD or not by setting OSD Display as Yes Mark or No No Mark When OSD Display is set to No No Mark just Channel OSD and STEREO OSD doesn t display 1 7 Remocon Remote...

Page 15: ...rk or No Do Not Work When Auto Off Operation is set to Yes Work Auto Off Operation work as configuration When Auto Off Operation is set to No Do Not Work Auto Off Operation Do Not work regardless of configuration 1 12 A V Default Setting Decide whether to use default data or user data that are program volume picture audio and ARC Be selected Yes Work or No Do Not Work This item has lower priority ...

Page 16: ...rposes 15 TROUBLESHOOTING No power LED indicator off Check short of main B D or Change Lips Change IC1107 IC1104 Change LED Assy Check 15V or 5V of Lips Check Output of IC1107 IC104 Check LED Assy Check P1100 P210 Connector Fail Fail Change Q1100 Check Output of Q1100 Fail Pass Fail Pass Pass Pass A Process ...

Page 17: ...heck the input Output of IC901 Check L900 L901 L902 L903 Check inverter Connector or inverter Check input source cable and jack Repeat A PROCESS Fail Change L900 L901 L902 L903 Fail Change IC901 Fail Change inverter connector or inverter Fail Change panel link cable or module Fail Change module Fail Check panel link Cable or module Pass Pass Pass Pass B Process ...

Page 18: ...BLE Check the signal of L1200 L1202 L1203 Repeat A Process Check the input output of IC1 Check the input output of IC901 Check input source cable and jack Fail Re soldering or Change the defect part Check X11 Fail Re soldering or Change the defect part Check X900 Fail Pass Pass Pass Check the input output of IC800 IC851 Re soldering or Change the defect part Fail Pass ...

Page 19: ... L1212 Repeat A Process Check the output of TU1000 Check the input output of IC1 Check the input output of IC800 IC851 Check input source cable and jack Fail Fail Fail Fail Re soldering or Change the defect part Chek X11 Fail Re soldering or Change the defect part Check 5V 33V of TU1000 Re soldering or Change the defect part Pass Pass Pass Check the input output of IC901 Fail Re soldering or Chang...

Page 20: ...oses 19 No Sound Check the speaker wire Change source input Check the input source Fail Pass Re soldering or Change the defect part Check X11 Check the input output of IC1 Fail Pass Re soldering or Change the defect part Check the input output of IC100 IC101 Fail Pass Change speaker Check the speaker Fail Pass ...

Page 21: ...BLOCK DIAGRAM 20 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 22: ...S signal through the integrated LVDS IC Or it is sent to the LCD module as a TTL output VCTi is the main microprocessor that handles video signal processing and sound signal processing It also manages the RF signals received from the tuner The scaler can control timing to fit into the LCD panel and can also control the size and position of the input signal 2 Power Supply Unit The power supply unit...

Page 23: ...Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 22 6631T25019J 5P 6631T20029X 6P 6631T25021C 3P 4P 6631T25019Y 4P 6631T11021B 41P 6631T20028G 11P 12P 6631T11017R 18P WIRING DIAGRAM ...

Page 24: ...MEMO 23 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 25: ...LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 24 EXPLODED VIEW 010 060 020 050 050 080 090 070 110 100 120 030 130 040 140 150 ...

Page 26: ...X 42 X 29 5 LUG 060 6871TST980A PCB Assembly Sub CONTROL T T CONTROL BOARD BRAND 070 EBR31526101 PCB Assembly Sub SUB A I ML041B RZ 20LZ50C 080 4951TKS175Y Plate Assembly ASSY 20LZ50 C LPL P7 Module only 4951TKS175Z Plate Assembly ASSY 20LZ50 C LPL P7 Module only LGEMA PAHNTOM 090 6871TPT280K PCB Assembly Power T T LIPS FOR LPL 20 1 PB FREE RM RZ 20LA70 77 LIEN CHANG 100 EBU31618901 Main Total Ass...

Page 27: ...50V Y5V 30 C1152 0CE107EK638 KMG5 0TP50VB100M 100uF 20 50V 229MA 55TO C116 0CK562CK51A C1608Y5P1H562KT 5 6nF 10 50V Y5P 30TO 85C C117 0CK562CK51A C1608Y5P1H562KT 5 6nF 10 50V Y5P 30TO 85C C118 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C119 0CH8106F691 MVK4 0TP16VC10M 10uF 20 16V 16MA 40TO 105 C12 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C120 0CH8106F691 MVK4 0TP16VC10M 10u...

Page 28: ... Y5V 30 C5 0CE475WJ6DC MVK4 0TP35VC4 7M 4 7uF 20 35V 15MA 40TO 1 C50 0CH5102K406 C2012S2L1H102JT 1nF 5 50V S2L 55TO 125C 2 C52 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C53 0CC102CK41A C1608C0G1H102JT 1nF 5 50V C0G 55TO 125C 1 C55 0CE475VK6DC VGV475M050S0ANC010 4 7uF 20 50V 23MA 40TO C56 0CC221CK41A C1608C0G1H221JT 220pF 5 50V C0G 55TO 125C C57 0CC221CK41A C1608C0G1H221JT 220pF 5 50V C...

Page 29: ...EC 150MW SOT23 D107 0DS226009AA KDS226 1 2V 85V 300MA 2A 4NSEC 150MW SOT23 D1150 0DRGS00199A UF4001 50V 1V 10UA 30A 50NSEC DO204 TP 2P 1 D1151 0DZ330009DF MTZJ33B 33V 30 32TO31 88V 65OHM 500MW DO34 ZD104 0DZ620009HB UDZS6 2B 6 2V 6 06TO6 33V 60OHM 200MW SOD32 ZD105 0DZ620009HB UDZS6 2B 6 2V 6 06TO6 33V 60OHM 200MW SOD32 ZD1200 0DZ620009HB UDZS6 2B 6 2V 6 06TO6 33V 60OHM 200MW SOD32 ZD1206 0DZ62000...

Page 30: ... 2012 R TP ROHM R1151 0RH4700D622 MCR10EZHJ471 470OHM 5 1 8W 2012 R TP ROHM R1152 0RH1001D622 MCR10EZHJ102 1KOHM 5 1 8W 2012 R TP ROHM R1153 0RH1000D622 MCR10EZHJ101 100OHM 5 1 8W 2012 R TP ROHM R1154 0RH0000D622 MCR10EZHJ000 0OHM 5 1 8W 2012 R TP ROHM R1155 0RH1002D622 MCR10EZHJ103 10KOHM 5 1 8W 2012 R TP RO R116 0RJ6801D677 MCR03EZPJ682 6 8KOHM 5 1 10W 1608 R TP RO R117 0RJ1000D677 MCR03EZPJ101 ...

Page 31: ... 8W 2012 R TP ROHM R36 0RH0000D622 MCR10EZHJ000 0OHM 5 1 8W 2012 R TP ROHM R4 0RJ1500D677 MCR03EZPJ151 150OHM 5 1 10W 1608 R TP ROH R41 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1608 R TP ROH R42 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1608 R TP ROH R45 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1608 R TP ROH R46 0RJ1001D677 MCR03EZPJ102 1KOHM 5 1 10W 1608 R TP ROHM R47 0RJ0000D677 MCR03EZPJ000 0OHM 5 ...

Page 32: ...2012 R TP ROHM RR103 0RH2201D622 MCR10EZHJ222 2 2KOHM 5 1 8W 2012 R TP ROH RR104 0RH2201D622 MCR10EZHJ222 2 2KOHM 5 1 8W 2012 R TP ROH RR150 0RJ4702D677 MCR03EZPJ473 47KOHM 5 1 10W 1608 R TP ROH RR151 0RH3301D622 MCR10EZHJ332 3 3KOHM 5 1 8W 2012 R TP ROH RR2 0RH0222D622 MCR10EZHJ220 22OHM 5 1 8W 2012 R TP ROHM RR3 0RH0222D622 MCR10EZHJ220 22OHM 5 1 8W 2012 R TP ROHM RR80 0RH1001D622 MCR10EZHJ102 1...

Page 33: ... BEIGE P2100 6602T20009E SMAW200 06P 6P 2 00MM 1R ANGLE DIP ST NATUR P2101 6631T25021C SMH250 03P YBNH250 04P 340mM 2 50MM 3P UL10 P2200 6602T25009B SMAW250 03P 3P 2 50MM 1R ANGLE DIP ST NATUR P3 6630VE00318 FCZ100E 18SS K 18P 1 00MM FFC FPC STRAIGHT P403 6602T10002F FH12K1 50S 0 5SH 50P 0 50MM FFC FPC ANGLE B PP210 6602T20008E SMW200 06P 6P 2 00MM 1R STRAIGHT DIP ST NAT 6631T20029X SMH200 06 SMH2...

Page 34: ...LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 35: ...LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 36: ...Aug 2007 Printed in Korea P NO ...

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