LG 22LN4000 Service Manual Download Page 17 | Manualshive

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LGE Internal Use Only

Copyright ©

LG Electronics. Inc. All rights reserved.

Only for training and service purposes

8. Abnormal sound (AV)-Main PCBA

wGGh}GG f

Abnormal sound (AV)

YES

NO

Insult AV cable tight

1

Change IC600

WAVEFORMS

pGG Gj]__Sj]_`

2

Check Line between JK101 and IC600

is open or short, Another is

change AV cable

NO

YES

j]__Sj]_`G OGP

2

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Summary of Contents for 22LN4000

Page 1: ...ODEL 22LN4000 22LN4000 TA CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ...nc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 7 TROUBLE SHOOTING GUIDE 10 BLOCK DIAGRAM 18 EXPLODED VIEW 19 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ...inals 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 prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed m...

Page 4: ...ctrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharg ing 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 e...

Page 5: ...he 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 replace...

Page 6: ...cification and performance of each parts are followed each drawing and specification by part number in accordance with BOM 5 The receiver must be operated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 4 General Specification No Item Specification Remarks 1 Market NON EU 2 Bro...

Page 7: ...pecified in the BOM into the Shipping area 3 Select Tool Option Area Option by using CH key and press the number key 0 9 consecutively Ex if the value of Tool Option1 is 7 input the data using number key 7 If not changed the option the input menu can differ from the model spec Refer to Job Expression of each main chassis ass y EBTxxxxxxxx for Option value Before PCB check you have to change the To...

Page 8: ...ad method 2 1 Connection USB memory for upgrade File name Mx42A_ PMN_xxxx bin or Mx42A_PTN_xxxx bin 2 Press the IN START key 3 Select the Upg Fw menu 4 Press the key and wait 5 If the progressive bar 100 will be completed Notice Do not plug out USB during upgrading 4 Check EDID and Write HDCP key This model is no need to write EDID data is in Program source 4 1 EDID data k G HKNGZZZ DKP OG 6T OJG ...

Page 9: ...ring For Automatic Adjustment Method 1 using IIC You connect RGB Cable Standard color coordinate and temperature when using the CA210 equipment RGB_Gains are fixed data for each model When doing Adjustment Please make circumstance as below W B condition Ambient Humidity 20 80 Ambient Temperature 25 5 C 6 Function Check 6 1 Check display and sound Check input and Signal items cf work instructions 1...

Page 10: ...r check the Lines of IC701 If there is any problem at Line Change IC701 NO Check Line short or open between IC600 and X600 Change IC600 or change X600 1 2 4 p G G Gj X f GXUX G Gj Z f 3 YES check the Lines of IC704 IC706 If there is any problem at Line Change IC704 IC706 NO Insert F W GZUZ G GXY G GwXYWf G G G S p GW G GY G GwXYWf Change control Or check Line short or open of P120 5 G G G G GXX G ...

Page 11: ...open or short at Line and wafer between IC702 IC703 and IC600 If there is any problem at Line Change IC702 IC703 or IC600 1 2 GZ G GX G Gpj_WXf YES It is not over 3V at 1pin of IC801 Change Q801 Or check Line short or open between R803 and 95pin of IC600 Change IC 600 4 3 NO check open or short at Line or change Adapter p GXY G GX G GwXWXf If is not under 1 5V at R744 change Q702 or check open and...

Page 12: ...e isn t insulted enough Insult LVDS cable until locking hook If LVDS cable have damage Change LVDS cable 1 Change module WAVEFORMS 3 p GXY G GX G GwXWXf If is not under 1 5V at R744 change Q702 or check open and short of Line among Q703 and Q702 If is under 10 8V at L710 Check open and short Of line between L710 and P101 2 3 NO Check open and short Of line between Q703 and P101 Or Check LVDS cable...

Page 13: ...FORMS p G G G G G WXf 2 p GpYjG G h G S G G WXf 3 4 p GpmG G G S _G G Gpj WWf NO NO 3 w G G WXG OzjsP w G G WXG OzkhP 4 SG _ G Gpj WW If 4 9V is not at plus pin of L705 check It is over 3V at 2pin of IC706 if it is not Check Line between IC706 and IC600 is open or short Another is change IC706 Check Line between TU401 and IC600 is open or short Another is change IC600 or TU401 Check Line between T...

Page 14: ...oses 5 Abnormal screen AV Main PCBA w G Gh G G f Abnormal screen AV YES NO NO Insult AV cable tight 1 Change IC600 WAVEFORMS p Gp G G G G G G f Change Timing to 480I 576I Or change format CVBS 2 p G G Gy X 3 Check Line between JK101 and IC600 is open or short Another is change AV cable NO YES YES y XGOj izP 3 ...

Page 15: ...pj WYf If 3V is not plus 13 27pin of IC502 check It is over 3V at L501 L504 if it is not Check Line between L712 and IC502 is open or short Another is change IC701 IC502 NO 3 4 YES p GpYjG G G YZSY G Gpj WYf Check Line between IC502 and IC600 is open or short Another is change IC502 or IC600 NO 5 p GpYzG G G y XWSy XXSy XYSy XZf 6 Check Line between IC501 and IC600 is open or short Another is chan...

Page 16: ...FORMS p G G G G G WXf If 4 9V is not at plus pin of L706 check It is over 3V at 2pin of IC706 if it is not Check Line between IC706 and IC600 is open or short Another is change IC706 2 p GpYjG G h G S G G WXf 3 Check Line between TU401 and IC600 is open or short Another is change IC600 or TU401 4 p GpmG G G S _G G Gpj WWf Check Line between TU401 and IC600 is open or short Another is change IC600 ...

Page 17: ...Only for training and service purposes 8 Abnormal sound AV Main PCBA w G Gh G G f Abnormal sound AV YES NO Insult AV cable tight 1 Change IC600 WAVEFORMS p G G Gj __Sj _ 2 Check Line between JK101 and IC600 is open or short Another is change AV cable NO YES j __Sj _ G O G P 2 ...

Page 18: ... HDMI RX VIF De mode Decoder saw filter ADC Audio processor Scalar Video processor LVDS TX System EEPROM ADC Speaker Amp 5W LCD module Flash video ADC audio saw filter OSD LUT Crystal IR LED Touch SIF De mode LDO 2 5v_SDR MCU 64M SDRAM CVBS R F 3 3v_AVCC 1 1V_VCCK 1 25v_AVDD LVDS 1366X768 60hz 76M hz 24M hz MT8223L DC DC DC DC DC DC LDO Adapter BJT 12v_module Burst up 22 24V BLOCK DIAGRAM ...

Page 19: ...echanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT...

Page 20: ...4828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 21: ...4828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 22: ...4828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 23: ...4828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 24: ...4828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 25: ...4828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 26: ...4828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

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