LG 24LF454B Service Manual Download

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LGE Internal Use Only

Only for training and service purposes

2. No Screen on

Replace Cable

Module Back Light On?

Check IC1001 & Q1002

Replace LED Driver IC or FET

Check Panel Power 12V (P401 #30)

Check IC500 Output 12V

Replace IC500 &

Recheck

Check Panel input Clock

P401 (#9, #10 )

Check IC300

Repair Main B/D

Check FFC Cable for Damage or

Open Conductors

Check LED Driver Output

(C1024)

Replace T-Con Board or Module

Check IC300

Replace Main SOC

Check WLED_ENABLE High?

Summary of Contents for 24LF454B

Page 1: ...se Only P NO CHASSIS MODEL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL MFL69169575 1612 REV00 24LF454B 24LF454B PU 24LJ4540 24LJ4540 PU 24LJ4540 WU LU72A LED TV ...

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 UPGRADE 8 TROUBLE SHOOTING GUIDE 9 BLOCK DIAGRAM 13 EXPLODED VIEW 14 ...

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: ...9 94 60 27 00 27 03 SDTV 480P 2 720 576 31 25 50 00 27 864 SDTV 576P 3 1280 720 37 50 50 00 74 250 HDTV 720P 4 1280 720 44 96 45 59 94 60 74 17 74 25 HDTV 720P 5 1920 1080 33 72 33 75 59 94 60 74 17 74 25 HDTV 1080I 6 1920 1080 28 125 50 00 74 25 HDTV 1080I 7 1920 1080 27 00 24 74 25 HDTV 1080P 8 1920 1080 33 75 30 00 74 25 HDTV 1080P 9 1920 1080 56 250 50 148 5 HDTV 1080P 10 1920 1080 67 43 67 5 ...

Page 8: ... 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 9: ...er 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 10: ...n Check IC1001 Q1002 Replace LED Driver IC or FET Y N N Check Panel Power 12V P401 30 Check IC500 Output 12V Replace IC500 Recheck Y N Check Panel input Clock P401 9 10 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 11: ... 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 12: ...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 14: ...ical and mechanical parts in this chassis have special 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 ...

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