LG 22LJ4540 Service Manual Download

Page: 10 / 16

- 10 -

LGE Internal Use Only

Only for training and service purposes

TROUBLE SHOOTING

1. No Power

Replace X300

Check C500

Voltage Level (19V)

Check Power connector

OK ?

Replace Adapter

Check IC1001 Output

Voltage Level (3.3V)

Replace IC1001 &

Recheck

Check X300 Clock

24MHz

Replace IC405 Flash

Memory

Check IC503 Output

Voltage Level (5V)

Replace IC503 &

Recheck

Check IC504 Output

Voltage Level (1.15V)

Replace IC504 &

Recheck

Summary of Contents for 22LJ4540

Page 1: ...ansmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes without limitation any text graphics or logos in this Service Manual Copyright 2017 LG Electronics Inc All rights reserved Only training and service purposes CONFIDENTIA...

Page 2: ... LG Electronics Inc All right reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 9 TROUBLE SHOOTING GUIDE 10 BLOCK DIAGRAM 14 EXPLODED VIEW 15 ...

Page 3: ... 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 metallic parts such as antenna terminals phone jacks etc If the exposed metallic part has a return path to the chassis the measured re...

Page 4: ...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 5: ...e 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 replaced...

Page 6: ...Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL EMC FCC 4 Model general specification No Item Specification Remarks 1 Market AMERICA CANADA MEXICO LJ4540 LF454Bseries is US only MT49x Series is Mexico only 2 Receiving system ATSC NTSC M 64 256 QAM 3 Available Channel VHF 2 13 UHF 14 69 CATV 1 135 DTV 2 69 CADTV 1 135 4 Interface RF Composite CVBS Comp...

Page 7: ... 74 25 HDTV 1080P 9 1920 1080 56 250 50 148 5 HDTV 1080P 10 1920 1080 67 43 67 5 59 94 60 148 35 148 50 HDTV 1080P No Resolution H freq kHz V freq Hz Pixel clock MHz Remark 1 720 400 31 468 70 080 28 321 2 640 480 31 469 59 940 25 175 3 640 480 37 500 75 000 31 500 4 800 600 37 879 60 317 40 000 5 800 600 46 875 75 000 49 500 6 1024 768 48 363 60 004 65 000 7 1024 768 56 476 70 069 75 000 HDMI PC ...

Page 8: ... freq kHz V freq Hz 1 720x480 15 730 59 940 720x480i 2 15 750 60 000 3 31 470 59 940 720x480p 4 31 500 60 000 5 720x576 15 625 50 000 720x576p 6 31 250 50 000 7 1280x720 44 960 59 940 1280x720p 45 000 60 000 8 37 500 50 000 9 1920x1080 33 720 59 940 1920x1080i 10 33 750 60 000 11 28 125 50 000 1920x1080p 12 56 250 50 000 13 67 432 59 940 14 67 500 60 000 Video Color Format YcbCr 444 422 xvYcc is n...

Page 9: ... 2 Put the USB Stick to the USB socket 3 3 Automatically detecting update file in USB Stick If your downloaded program version in USB Stick is Low it didn t work But your downloaded version is High USB data is automatically detecting 4 TV Software Upgrade feature will be displayed 5 Updating is starting 6 Updating Completed The TV will restart automatically After downloading have to adjust TOOL OP...

Page 10: ...wer Replace X300 N Check C500 Voltage Level 19V Check Power connector OK Replace Adapter Y N Y Check IC1001 Output Voltage Level 3 3V Replace IC1001 Recheck Y N Check X300 Clock 24MHz Replace IC405 Flash Memory Y Check IC503 Output Voltage Level 5V Replace IC503 Recheck Y N Check IC504 Output Voltage Level 1 15V Replace IC504 Recheck N Y ...

Page 11: ...ck IC1001 Q1002 Replace LED Driver IC or FET Y N N Check Panel Power 5V P402 1 or Check IC503 Output 5V Replace IC503 or IC500 Recheck Y N Check Panel input Clock P402 10 11 Check IC300 Repair Main B D Y N Check FFC Cable for Damage or Open Conductors Check LED Driver Output C1024 Replace T Con Board or Module Y Check IC300 Replace Main SOC N Check WLED_ENABLE High Y ...

Page 12: ... All right reserved Only for training and service purposes 3 No Video Digital TV Check RF Cable Y 1 Check RF IC L200 Power 3 3V 2 Check IC1001 Output voltage 3 3V Replace IC1001 Recheck Y N Check SCL SDA Line TU200 1 2 Replace TU200 or IC300 Main Scaler N ...

Page 13: ...or training and service purposes 4 No Video HDMI Replace Main Scaler IC300 Check input signal format Is it supported Check JK100 for proper connection or Damage Replace Connector Y N Check I2C Signal JK100 Re Download EDID Data Y N Y Check HDMI Cable for Damage or Open Connector Y ...

Page 15: ...l safety related characteristics These parts are identified by in the EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 300 200 120 900 540 831 541 832 400 510 LV1 A2 730 910 ...

Page 16: ......

Search results

Summary of Contents for 22LJ4540

Reviews:

Related manuals for 22LJ4540

Brands by name

Popular brands

LG 22LJ4540, Service Manual

Search results

Summary of Contents for 22LJ4540

Reviews:

Related manuals for 22LJ4540

Brands by name

Popular brands