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LG 22LN4050 Service Manual Download Page 1

Printed in Korea

P/NO : MFL67732805 (1304-REV00)

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

CHASSIS : LB35A

MODEL : 22LN4050   

22LN4050-TB

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

Summary of Contents for 22LN4050

Page 1: ...MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only CHASSIS LB35A MODEL 22LN4050 22LN4050 TB CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

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 9 TROUBLE SHOOTING GUIDE 13 BLOCK DIAGRAM 23 EXPLODED VIEW 24 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: ...umber 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 Model General Specification HDMI 1 4 with Deep Color is only apply for FHD Model No Item Specification Remarks 1 Market NON EU 2 Broadcasting system PAL SECAM B G D K ...

Page 7: ... 1080I 50Hz 11 1920 1080 33 72 59 94 74 176 HDTV 1080I 12 1920 1080 33 75 60 00 74 25 HDTV 1080I 13 1920 1080 56 25 50 148 5 HDTV 1080P 14 1920 1080 67 432 59 94 148 350 HDTV 1080P 15 1920 1080 67 5 60 00 148 5 HDTV 1080P 6 HDMI Input 6 1 PC Mode Spec out but it can be shown the picture at only HDMI DVI IN 1 via DVI to HDMI Cable Monitor Range Limits Min Vertical Freq 58 Hz Max Vertical Freq 63 Hz...

Page 8: ...0 00 27 027 SDTV 480P 6 720 576 31 25 50 00 27 SDTV 576P 7 1280 720 44 96 59 94 74 176 HDTV 720P 8 1280 720 45 60 00 74 25 HDTV 720P 9 1280 720 37 5 50 00 74 25 HDTV 720P 10 1920 1080 28 125 50 00 74 25 HDTV 1080I 11 1920 1080 33 72 59 94 74 176 HDTV 1080I 12 1920 1080 33 75 60 00 74 25 HDTV 1080I 13 1920 1080 56 25 50 00 148 5 HDTV 1080P 14 1920 1080 67 432 59 94 148 350 HDTV 1080P 15 1920 1080 6...

Page 9: ...e In Carry the command ADC adjust ADC Adjust A D 1 0 Automatically adjustment The use of a internal pattern HDMI 1 256Bytes 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 10 01 17 01 03 80 A0 5A 78 0A F3 30 A4 54 46 96 26 20 0F 49 4B 21 08 00 45 40 01 01 61 40 01 01 01 01 30 01 01 01 01 01 01 01 1D 00 72 51 D0 1E 20 6E 28 40 55 00 C4 8E 21 00 00 1E 1B 21 50 A0 51...

Page 10: ...method 4 5 1 Auto WB calibration 1 Set TV in ADJ mode using P Only key or POWER ON key 2 Place optical probe on the center of the display It need to check probe condition of zero calibration before adjustment 3 Connect RS 232C Cable 4 Select mode in ADJ Program and begin a adjustment 5 When WB adjustment is completed with OK message check adjustment status of pre set mode Cool Medium Warm 6 Remove...

Page 11: ...t 1KHz sine wave signal 0 4Vrms 3 RGB PC 1KHz sine wave signal 0 7Vrms 7 2 Specification 8 GND and HI POT Test 8 1 GND HI POT auto check preparation 1 Check the POWER CABLE and SIGNAL CABE insertion condition 8 2 GND HI POT auto check 1 Pallet moves in the station POWER CORD AV CORD is tightly inserted 2 Connect the AV JACK Tester 3 Controller GWS103 4 on 4 GND Test Auto If Test is failed Buzzer o...

Page 12: ...should be lower 10 lux Try to isolate adj area into dark surrounding 2 Probe location Color Analyzer CA 210 probe should be within 10cm and perpendicular of the module surface 80 100 3 Aging time 1 After Aging Start Keep the Power ON status during 5 Minutes 2 In case of LCD Back light on should be checked using no signal or Full white pattern 10 2 2 Equipment 1 Color Analyzer CA 210 NCG CH 9 WCG C...

Page 13: ...s of IC701 If there is any problem at Line Change IC701 NO Check Line short or open between IC501 and X501 Change IC501 or change X501 1 2 4 Is 1 8V at C745 is 1 25V at C742 3 YES check the Lines of IC711 IC704 If there is any problem at Line Change IC704 IC706 NO Insert F W is 3 3V at 1pin of P120 when push power key Is 0v at 2pin of P120 Change control Or check Line short or open of P120 5 is th...

Page 14: ...t at Line and wafer between IC704 IC711 and IC600 If there is any problem at Line Change IC704 IC711 or IC501 1 2 is 3V at 3pin of IC801 YES It is not over 3V at 1pin of IC801 Change Q802 Or check Line short or open between R803 and 95pin of IC501 Change IC 501 4 3 NO check open or short at Line or change Adapter is 12V at 1pin of P101 If is not under 1 5V at R722 change Q721 or check open and sho...

Page 15: ...O YES If LVDS cable isn t insulted enough Insult LVDS cable until locking hook If LVDS cable have damage Change LVDS cable 1 Change module WAVEFORMS 3 Is 12V at 1pin of P101 If is not under 1 5V at R722 change Q721 or check open and short of Line among Q720 and Q721 If is under 11V at L110 Check open and short Of line between L110 and P101 2 3 NO Check open and short Of line between Q720 and P101 ...

Page 16: ...m At 3 4pin of TU401 3 4 Is IF waveform at 43 44 pin of IC501 NO NO 3 3Pin of TU401 SCL 4Pin of TU401 SDA 4 43 44pin of IC501 If 1 7V is not at plus pin of TU401 check It is over 3V at 2pin of IC401 if it is not Check Line between TU401 and IC401 is open or short Another is change IC401 or TU401 Check Line between TU401 and IC501 is open or short Another is change IC501 or TU401 Check Line between...

Page 17: ...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 IC501 WAVEFORMS p Gp G G G G G G f Change Timing to 480I 576I Or change format CVBS 2 p G G Gy W 3 Check Line between JK101 and IC501 is open or short Another is change AV cable NO YES YES y W GOj izP 3 ...

Page 18: ...er 8 bit in Ycbcr Ypbpr RGB 2 Is waveform at 10 12pin of JK204 3 Check Line between JK204 and IC501 is open or short Another is Change HDMI cable NO YES YES Is waveform at 1 3 4 6 7 9pin Of JK204 YES 4 Check Line between JK204 and IC501 is open or short Another is Change HDMI cable NO Can read EDID and HDCP key though 16 15pin of JK204 Check Line between JK204 and IC501 is open or short Another is...

Page 19: ...IC301 If 3V is not plus 30pin of IC301 check It is over 3V at L301 if it is not Check Line between L301 and IC301 is open or short Another is change IC701 IC301 NO 3 4 YES Is I2C waveform at 10 11pin of IC301 Check Line between IC301 and IC501 is open or short Another is change IC301 or IC501 NO 5 Is I2S waveform at R301 R302 R303 R304 6 Check Line between IC301 and IC501 is open or short Another ...

Page 20: ...8V at 7pin of TU401 Is I2C waveform At 3 4pin of TU401 Is IF waveform at 43 44 pin of IC501 NO NO 3 3Pin of TU401 SCL 4Pin of TU401 SDA 4 43 44pin of IC501 If 1 7V is not at plus pin of TU401 check It is over 3V at 2pin of IC401 if it is not Check Line between TU401 and IC401 is open or short Another is change IC401 or TU401 Check Line between TU401 and IC501 is open or short Another is change IC5...

Page 21: ...ning and service purposes 9 Abnormal sound AV Main PCBA Put into AV cable completely Abnormal sound AV YES NO Insult AV cable tight 1 Change IC501 WAVEFORMS Is waveform at C520 C521 2 Check Line between JK101 and IC501 is open or short Another is change AV cable NO YES C520 C521 audio in 2 ...

Page 22: ...er 8 bit in Ycbcr Ypbpr RGB 2 Is waveform at 10 12pin of JK204 3 Check Line between JK204 and IC501 is open or short Another is Change HDMI cable NO YES YES Is waveform at 1 3 4 6 7 9pin Of JK204 YES 4 Check Line between JK204 and IC501 is open or short Another is Change HDMI cable NO Can read EDID and HDCP key though 16 15pin of JK204 Check Line between JK204 and IC501 is open or short Another is...

Page 23: ... LVDS Output P Dim Inv ON P_ST 3 5V M_3 3V TU_3 3V 19V Main_1 2V 18V 10 11 7 8 9 38 I2S_MCLK I2S_WS I2S_SCK I2S_SDO 108 111 117 IR KEY1 Led_PWR 102 105 53 52 45 85 84 EEP SDA EEP SCL 94 95 97 96 SPI_CLK SPI_DI SPI_CZ SPI_DO S_AMP_19V 32 40 LPF USB_5V 110 KEY2 ST_3 5V P_12V Q710 Main_1 8V M_3 3V Q720 AO3407A Panel_Vcc Main_5V To USB USB_DN USB_DP IF_P IF_N 31 35 1 8V REG 7 TU_1 8V 19 20 Audio out 2...

Page 24: ...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 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 ...

Page 27: ...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 28: ...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 29: ...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 30: ...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 31: ...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 32: ...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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