LG 55LF5950 Service Manual

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Owner's manual (68 pages)

Manual (44 pages)

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Page 1 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 : LA50H MODEL : 55LF5950 55LF5950-UB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69198603 (1505-REV00) Printed in Korea...
Page 2: Table Of Contents
ADJUSTMENT INSTRUCTION ..............8 BLOCK DIAGRAM .................. 16 EXPLODED VIEW .................. 20 SCHEMATIC CIRCUIT DIAGRAM ........... APPENDIX TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. 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. - 3 - Copyright © LG Electronics. Inc. All rights reserved. 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. - 5 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 6: Specification
2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : ~ 85 % - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 7 HDTV 1080P 1920*1080 26.97 23.97 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.716 29.976 74.176 HDTV 1080P - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 8: Adjustment Instruction
(2) Manual adjustment for White balance. (3) Shipment conditions, Channel pre-set 4.2.6. Inspection - In INSTART menu, check these keys. - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 9 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 ▪ Since embedded EDID data is used, EDID download JIG, HDMI cable and D-sub cable are not need. ⓔ Checksum(LG TV): Changeable by total EDID data. ▪ Adjust remocon ⓔ1 ⓔ2...
Page 10 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (2) Adj. Computer (During auto adj., RS-232C protocol is needed) ⓔ Checksum(LG TV): Changeable by total EDID data. (3) Adjust Remocon (4) Video Signal Generator MSPG-925F 720p/204-Gray ⓔ1...
Page 11: Color Temperature
“wb 00 ff”, and Adj. offset if need (Min) 10-19 20-35 36-49 50-79 80-119 Over 120 - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 12 (2) Check the sound from the TV Set (3) Check the Sound from the Speaker or using AV & Optic TEST program (It’s connected to MSHG-600) - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 13 Audio practical (1) Measurement max Output, 5.477 Vrms condition - EQ/AVL/Clear (Distortion=10% Voice: Off max Output) (2) Speaker (8Ω Impedance) - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 14 - GND Test = POWER CORD GND and SIGNAL CABLE GND. - Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL. (4) LEAKAGE CURRENT: At 0.5mArms - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 15 6.White Balance, you can select one of 2 Test-pattern: ON, OFF. Default is inner(ON). By selecting OFF, you can adjust using RF signal in 216 Gray pattern. - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 20: Exploded View
Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 21 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN1 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 22 2014.11.01 A5LR_Bring_Up ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN2 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 23 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2014.11.01 A5LR_Bring_Up ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 24 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. POWER LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 25 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 26 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR HDMI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 27 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR JACK THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 28 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. IR / KEY / WIFI LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 29 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 30 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR ETHERNET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 31 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR AUDIO AMP THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 32 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR EARPHONE AMP THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 33 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TUNER_1 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 34 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TUNER_2 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 35 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LVDS LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 36 A5LR_Bring_Up 2014.11.01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. eMMC LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 37 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR RS232C THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 40 Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GCSC System for these model. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 41 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 42 Check voltages of Check and Normal No Video/No audio Power Board replace voltage? ( D13V,A13V) MAIN B/D Replace Power Board and repair parts LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 43 2. Install Booster S/W Upgrade Replace Normal Contact with signal distributor or broadcaster (Cable or Air) Main B/D Picture? Normal Picture? Close Close LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 44 Request repair for external device/cable Check external External device HDMI device and /Cable Replace Main B/D error cable normal LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 45 (Check normal operation of External Input, Component Replace Screen HDMI and HDMI by connecting Jig, Main B/D normal? pattern Generator ,Set-top Box etc. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 46 Measure voltage of each output of Power B/D Normal? ※ Normal Replace Main B/D voltage? Close Check ST-BY Voltage Normal (D13V) voltage? ☞A18 Replace Power B/D Replace Power LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 47 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 48 Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board disconnection Connect Speaker to Main cable LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 49 (In case of External Input signal error) Connect and check Normal Check and fix other external device audio? external device Check and fix external device LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 50 Replace Main B/D (Power B/D don’t have problem) If R/C operate, Explain the customer Replace R/C cause is interference from light in room. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 51 Recognition error - S/W Version HDMI/ Check and fix Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 52 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand dent LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 53 “Part related to noise” in the Owners Manual. as shown in the solution manual (For models without any fix information, provide the description) LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 54 Defected Type caused by T-Con/ Inverter/ Exchange LED driver Board (PSU) A-3/5 Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 55 Normal Remote controller operation checking method D. Function error_ No response in remote controller Motion Remote controller operation checking method LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 56 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 57 (Power Board ↔ Main Board) - 공통 12 Pin SMAW200-H12S5K Power on PDIM #2 D13V D13V D13V A13V A13V DRV_ON PDIM #1 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 58 Menu(QUICK SETTING)  Channels Channel Tuning  Manual Tuning  Antenna DTV When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 59 2015. 04 .23 date <ALL MODELS> 1. Checking method for remote controller for adjustment Version Press the IN-START with the remote controller for adjustment LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 60 LCD TV connection diagram 2015. 04 .23 date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 61 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 62 You can view 7 types of patterns using the ADJ Key Checking item : 1. Defective pixel 2. Residual image 3. Module error (ADD-BAR,SCAN BAR..) 4.Video error (Classification of MODULE or Main-B/D!) LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 63 Abnormal Power Section Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 64 Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 65 Appendix : Exchange LED driver Board(PSU) A-3/5 No Light Dim Light Dim Light Dim Light No picture/Sound Ok LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 66 Panel Mura, Light leakage Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 67 Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 68 2015. 04 .23 date ST-BY condition: On Power ON condition: Off ※ Be careful : LF59 Models have a Standby Light Control UI LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 69 (Power Board ↔ Main Board) - 공통 12 Pin SMAW200-H12S5K Power on PDIM #2 D13V D13V D13V A13V A13V DRV_ON PDIM #1 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 70 <ALL MODELS> Entry method 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 71 1. Press the MENU button on the remote controller 2. Select the Sound function of the Menu 3. Select Sound Out function of the Menu LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 72 ③ Connect the tester RX1 to the speaker terminal and if you hear the “Chik Chik” sound when you touch the GND and output terminal, the speaker is normal. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 73 4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 74 1, 2. Check IR cable condition between IR & Main board. 3. Check the 3.5V_WIFI on the terminal 2. 4. Check the B/T version value. ④ LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...

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55lf5950-ub

LG 55LF5950 Service Manual

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Summary of Contents for LG 55LF5950

Page 2: Table Of Contents

Page 3: Safety Precautions

Page 4: Servicing Precautions

Page 6: Specification

Page 8: Adjustment Instruction

Page 11: Color Temperature

Page 16: Block Diagram

Page 20: Exploded View

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LG 55LF5950 Service Manual

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Summary of Contents for LG 55LF5950

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