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Table of Contents
LED TV
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO :
MFL67234649 (1308-REV00)
LJ31A
24LN451B
North/Latin America
Europe/Africa
Asia/Oceania
24LN451B-PU
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea
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Table of Contents
Related Manuals for LG 24LN451B
Summary of Contents for LG 24LN451B
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Page 1: Service Manual
Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LED TV SERVICE MANUAL CHASSIS : LJ31A MODEL : 24LN451B 24LN451B-PU CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67234649 (1308-REV00) Printed in Korea... -
Page 2: Table Of Contents
ADJUSTMENT INSTRUCTION ..............9 TROUBLE SHOOTING ................13 BLOCK DIAGRAM .................. 20 EXPLODED VIEW .................. 21 SCHEMATIC CIRCUIT DIAGRAM .............. Copyright © LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes... -
Page 3: Safety Precautions
An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright © LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes... -
Page 4: Servicing Precautions
Copyright © LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes... - Page 5 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. Copyright © LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
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Page 6: Specification
1) Performance : LGE TV test method followed 2) Demanded other specification - Safety : CE,IEC specification - EMC : CE,IEC specification Copyright © LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes... -
Page 7: General Specification
Storage Environment Temp : -10 ˚C ~ 60 ˚C non condensing Humidity : 5 % ~ 90 % non condensing Copyright © LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes... - Page 8 50 .000 148.500 HDTV 1080P 1920* 1080 67.432 59.940 148.350 HDTV 1080P 1920* 1080 67.5 00 60.000 148.500 HDTV 1080P Copyright © LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
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Page 9: Adjustment Instruction
Use the speed under you didn’t have a DTV/ATV test on production line. 200KHz. Copyright © LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes... - Page 10 * Display and Sound check is executed by Remote controller. → Caution : Not to push the INSTOP KEY after completion if the function inspection. Copyright © LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
- Page 11 4) Check the model name Instart menu → Factory name displayed (ex GP4-LOW) 5) Check the Diagnostics (DTV country only) → Buyer model displayed (ex 24MN33D) Copyright © LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
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Page 12: White Balance Adjustment
4.7. Outgoing condition Configuration * After all function test., press IN-STOP Key by SVC Remote controller. And make Outgoing Condition Copyright © LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes... -
Page 13: Trouble Shooting
Voltage Level (1.5V) Check IC809 Output Replace IC809 Voltage Level (1.23V) Check X201 Clock Replace X201 24MHz Replace IC100 Flash Memory Copyright © LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes... - Page 14 Repair Main B/D P601(#9,10) Check FFC Cable for damage Replace Cable or open conductors. Replace T-con Board or module Copyright © LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
- Page 15 2. Check IC805 Output voltage(1.8V) Check Tuner(TU3700) I2C Signal Check IC101 SCL(R3735), SDA(R3736) Check Tuner(TU3600) Replace Tuner(TU3600) Data, CLK, SYN, VAL Recheck Copyright © LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
- Page 16 Replace R239,R237,R241 R239,R237,R241 C220,C218,C222 C220,C218,C222 IC101 has problem Wave form of C218 Wave form of C222 Wave form of C220 Copyright © LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
- Page 17 Wave form of R4025(Vsync) Wave form of R4024(Hsync) Wave form of R228/C204 Wave form of R230/C206 Wave form of R232/C208 Copyright © LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
- Page 18 Check I2C Signal (JK501) Re download EDID data (#15, #16) Replace Scaler(IC101) Check HDCP Key (IC101) Copyright © LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
- Page 19 Replace IC807(3.3V) Check Signal from IC700 Replace IC700 L700,L701, L706, L709 Check Signal from IC101 Replace IC101 SDA/SCL (R703/R214, R707/R213) Copyright © LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
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Page 20: Block Diagram
BLOCK DIAGRAM Copyright © LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes... -
Page 21: Exploded View
X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright © LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes... - Page 22 NC4_S7LRM ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN1_NON_EU Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 23 2013.05.25 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MAIN2_NON_EU THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 24 NC4_S7LRM ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR INTERFACE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 25 NC4_S7LRM ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR HDMI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 26 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MODULE&CONTROL THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 27 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR AUDIO AMP THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 28 NC4_S7LRM ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 29 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LED DRIVER Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 30 2013.05.25 NC4_S7LRM ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 31 NC4_S7LRM ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR TUNER_NON_EU THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 32 NC4_S7LRM ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR COMP THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...