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Standard Repair Process Detail Technical Manual

Main Board to LED back light Voltage

A. Video error_No video/Normal audio

A2

Established
date

Revised
date

Error
symptom

Content

Measure DC Voltage applying to LED backlight from Main B/D

<ALL MODELS>

Copyright © 2017 LG Electronics Inc. All rights reserved.

Only for training and service purposes.

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Содержание 43UV770M

Страница 1: ...r electronic means publication modification copying or transmission 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 right...

Страница 2: ...l rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 9 BLOCK DIAGRAM 10 EXPLODED VIEW 11 DISASSEMBLY 12 TROUBLE SHOOTING GUIDE APPENDIX ...

Страница 3: ...he 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 metallic parts such as ...

Страница 4: ...c charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial 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 electrosta...

Страница 5: ...oints 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 component...

Страница 6: ... 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 General Specification No Item Specification Remark 1 Market North America 2 Broadcasting system ATSC NTSC M 64 256 QAM 3 Available Channel VHF 02 13 UHF 14 69 DTV 02 69 CATV 01 135 CADTV 01 135 4 Receiving system Digital ATSC 64 256 QAM Analog NTSC M 5 ...

Страница 7: ...1360 768 47 71 60 01 84 75 VESA WXGA 7 1152 864 54 34 60 05 80 VESA 8 1280 1024 63 98 60 02 109 00 SXGA Support to HDMI PC 32LV760M 43 49 55UV770M only 9 1920 1080 67 5 60 158 40 WUXGA Reduced Blanking 32LV760M 43 49 55UV770M only 10 1920 1080 135 120 297 UDTV 1080P 43 49 55UV770M only 11 3840 2160 54 24 00 297 00 UDTV 2160P 43 49 55UV770M only 12 3840 2160 56 25 25 00 297 00 UDTV 2160P 43 49 55UV...

Страница 8: ...0 63 36 HDTV 1080P 17 1920 1080 33 71 29 97 79 120 HDTV 1080P 18 1920 1080 33 75 30 00 79 20 HDTV 1080P 19 1920 1080 56 25 50 00 148 5 HDTV 1080P 20 1920 1080 67 43 59 94 148 35 HDTV 1080P 21 1920 1080 67 5 60 00 148 50 HDTV 1080P 22 1920 1080 112 5 100 297 00 HDTV 1080P 23 1920 1080 134 86 119 88 296 70 HDTV 1080P 24 1920 1080 135 00 120 297 HDTV 1080P 25 3840 2160 53 95 23 98 296 70 UDTV 2160P 2...

Страница 9: ...tarts and the settings are initialized 4 When the update is finished the TV automatically turns off and then turns on 5 Check the SW version to see if it has been updated and check the Tool option 2 Manual Download 1 Press the Menu button on the remote control to enter All Settings 2 With the focus on the GENERAL menu Press key 7 in succession 7 times and the TV Manager will pop up as shown below ...

Страница 10: ...A HDMI2 2 0 HDMI1 2 0 SYSTEM EEPROM 256Kb eMMC 4GB DDR3 2133 X 16 512MB X 2EA X_TAL 24MHz I2S Out D Demod I2C 2 SPDIF OUT BLUTOOTH WIFI SUB ASSY Tuner I2C 5 CVBS SIF ARC USB2 2 0 OCP 1 5A TI MICOM IR Key Eye UART S W Tx Rx Debug X_TAL 32 768MHz I2C 1 Ti Micom Data Demod RF b LAN Game Control MPI TV LINK CFG MPI SPI Rear Rear Side Side Pillow SPK AMP Trans Pillow SPK Rear Rear Side Rear Rear ...

Страница 11: ...d 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 200A 200 400 800 540 521 120 820 LV1 530 121 500 570 411 700 LV2 ...

Страница 12: ... 12 Copyright LG Electronics Inc All rights reserved Only for training and service purposes DISASSEMBLY Fig 1 Fig 2 Screw 16 ea Screw 6 ea Total Screw No 22ea P4000 4 4 4 4 5 5 ...

Страница 13: ... 13 Copyright LG Electronics Inc All rights reserved Only for training and service purposes Fig 3 Fig 4 6 ...

Страница 14: ... 14 Copyright LG Electronics Inc All rights reserved Only for training and service purposes Fig 6 Fig 5 9 11 9 9 9 9 9 9 10 9 9 7 8 7 7 8 8 ...

Страница 15: ... 15 Copyright LG Electronics Inc All rights reserved Only for training and service purposes Fig 7 Fig 8 Screw 9EA b b a b b a 12 12 a b b a b b 13 13 13 13 14 14 14 14 ...

Страница 16: ... 16 Copyright LG Electronics Inc All rights reserved Only for training and service purposes Fig 10 Fig 9 15 16 17 17 ...

Страница 17: ...TROUBLE SHOOTING GUIDE Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 18: ...n off while viewing power auto on off 8 8 C Audio error No audio Normal video 9 9 Wrecked audio discontinuation noise 10 10 D Function error Remote control Local switch checking 11 11 External device recognition error 12 12 E Noise Circuit noise mechanical noise 13 13 F Exterior error Exterior defect 14 First of all Check whether there is SVC Bulletin in GSCS System for these model Contents of Sta...

Страница 19: ...nce value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 14 Error symptom A Video error No video Normal audio A4 A1 A2 A6 A3 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS Cable Speaker Cable IR B D Cable Normal Audio On Y N Normal Voltage ...

Страница 20: ... replace MAIN B D Replace Power Board and repair parts Standard Repair Process A Video error No video No audio A4 Established date Revised date 2 14 Error symptom End Normal Voltage Y N Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 21: ...yer Set Top Box Different maker TV etc Replace Main B D Check Tuner soldering Y N Y Y By using Digital signal level meter Y Contact with signal distributor or broadcaster Cable or Air N N Y N A6 Standard Repair Process Established date Revised date 3 14 Error symptom End Normal Signal Normal Picture Normal Picture Normal Picture SVC Bulletin End End Normal Picture Copyright 2017 LG Electronics Inc...

Страница 22: ...connecting RF Cable at other equipment Set Top Box Different maker TV etc A6 Standard Repair Process Established date Revised date 4 14 Error symptom Contact with signal distributor or broadcaster Cable or Air N Check Tuner soldering Replace Main B D End Normal Picture SVC Bulletin Normal Signal End Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 23: ... Main B D Replace Main B D N N A Video error Color error A7 N Y Replace module Request repair for external device cable Check Test pattern A10 A8 A9 Standard Repair Process Established date Revised date 5 14 Error symptom End Color error Color error External device Cable Normal External device Cable Normal External Input Co mponent error HDMI error Copyright 2017 LG Electronics Inc All rights rese...

Страница 24: ...N Y Replace Main B D Request repair for external device Connect other external device and cable Check normal operation of External Input Component HDMI by connecting Jig pattern Generator Set top Box etc Replace Main B D N Y Check S W Version Y N S W Upgrade Y N Y N Replace Main B D Replace Module Established date Revised date 6 14 Error symptom Standard Repair Process A7 A8 A9 Check Test pattern ...

Страница 25: ...voltage of each output of Power B D N Y Replace Main B D Y Replace Main B D N Y Check ST BY 3 5V Replace Power B D N Replace Power B D Y A11 A12 A13 A4 Standard Repair Process Established date Revised date 7 14 Error symptom Stand By Red End Power LED On Normal Voltage Normal Voltage Normal Operati on Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 26: ...OWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Download POWEROFF_UNKNOWN Power off...

Страница 27: ...d repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board C Audio error No audio Normal video A15 A16 Established date Revised date 9 14 Error symptom Standard Repair Process End Normal Voltage Off Disconn ection Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 28: ...ble ANT provider Y Check audio B Voltage 13 2V In case of External Input signal error Check and fix external device Replace Main B D N Established date Revised date 10 14 Error symptom Standard Repair Process A16 End Signal Normal Normal Voltage Normal Audio Wrecked Audio Discontinuation Noise for all audio Wrecked Audio Discontinuation Noise only for D TV Wrecked Audio Discontinuation Noise only ...

Страница 29: ...pair Cable connection Connector solder Check B 3 5V On Main B D A17 N N Check 3 5v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A4 Check IR Output signal N Y Repair Replace IR B D N A17 Replace Main B D Y A17 Standard Repair Process Established date Revised date 11 14 Error symptom End Normal Operating Normal Voltage Normal Signal Normal Operating Normal Operatin...

Страница 30: ...ordance with technical information D Function error External device recognition error Established date Revised date 12 14 Error symptom Standard Repair Process Signal Input Technical information External Input and Component Recognition error HDMI Optical Recognition error Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 31: ... the solution manual For models without any fix information provide the description OR Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part related to nose in the Owner s Manual E Noise Circuit noise mechanical noise Established date Revised date 13 14 Error symptom Sta...

Страница 32: ...rol Replace stand F Exterior defect Exterior defect Established date Revised date 14 14 Error symptom Standard Repair Process Module damage Cabinet damage Remote Control damage Stand damage Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 33: ...onnection diagram A7 8 Check Link Cable LVDS reconnection condition A8 A9 9 Adjustment Test pattern ADJ Key A10 10 A Video error_Vertical Horizontal bar residual image light spot Connection diagram A8 11 Check Link Cable LVDS reconnection condition A8 A9 12 Adjustment Test pattern ADJ Key A10 13 Appendix Defected Type caused by T Con Inverter Module Exchange T Con Board 1 A 1 5 14 Exchange T Con B...

Страница 34: ...POWER OFF MODE checking method A14 23 C Audio error_No audio Normal video Checking method in menu when there is no audio A15 24 Voltage and speaker checking method when there is no audio A16 25 C Audio error_Wrecked audio discontinuation Voltage and speaker checking method in case of audio error A16 26 D Function error_ No response in remote Control key error Remote Control operation checking meth...

Страница 35: ...Light On with naked eye A Video error_No video Normal audio ALL MODELS A1 Established date Revised date Error symptom Content Power On disjoint back case check lighting Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 36: ...ck light Voltage A Video error_No video Normal audio A2 Established date Revised date Error symptom Content Measure DC Voltage applying to LED backlight from Main B D ALL MODELS Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 37: ...chnical Manual Check White Balance value A Video error_No video Normal audio ALL MODELS A3 Established date Revised date Error symptom Content Entry method 1 Press the ADJ button on the remote Control for adjustment 2 Enter into White Balance of item 9 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 Copyright 2017 LG Elect...

Страница 38: ...1 PWR_ON 2 PDIM 2 3 GND 4 D13 2V 5 D13 2V 6 D13 2V 7 A13 2V 8 A13 2V 9 GND 10 GND 11 DRV_ON 12 PDIM 1 Check DC 3 5V 13 2V 18 Pin Power Board Main Board SMAW200 H18S5K 1 GND 2 GND 3 PWR_ON 4 PDIM 2 5 GND 6 D13 2V 7 D13 2V 8 D13 2V 9 A13 2V 10 A13 2V 11 GND 12 GND 13 DRV_ON 14 PDIM 1 15 GND 16 SCLK 17 V SYNC 18 SIN 43 49 55 Copyright 2017 LG Electronics Inc All rights reserved Only for training and ...

Страница 39: ...ical Manual TUNER input signal strength checking method A Video error_Video error video lag stop A5 Established date Revised date Error symptom Content Menu Channels Channel Tuning Manual Tuning Select Channel Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 40: ...deo error video lag stop 1 Checking method for remote Control for adjustment Press the IN START with the remote Control for adjustment Version A6 Established date Revised date Error symptom Content Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 41: ...rizontal bar residual image light spot As the part connecting to the external input check the screen condition by signal Jack Spec Depending on model A7 Established date Revised date Error symptom Content Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 42: ...ard Repair Process Detail Technical Manual Check and replace Link Cable LVDS and contact condition A Video error_Color error ALL MODELS A8 A9 Established date Revised date Error symptom Content Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 43: ... 6 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 A10 Established date Revised date Error symptom Content Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 44: ...t CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange T Con Board 1 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 45: ... Abnormal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange T Con Board 2 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 46: ...Appendix Exchange PSU LED driver No Light Dim Light Dim Light Dim Light No picture Sound Ok Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 47: ...ht leakage Press damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage Un repairable Cases In this case please exchange the module Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 48: ... Vertical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 Un repairable Cases In this case please exchange the module Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 49: ...nt display LED B Power error _No power A11 Established date Revised date Error symptom Content ST BY condition Red Front LED control Menu General Standby Light On Off Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 50: ..._No power A12 Established date Revised date Error symptom Content Backlight Forward Voltage Symbol Values Unit Min Typ Max 55UV770M VF 99 4 106 6 113 8 Vdc 49UV770M 85 05 91 8 43UV770M 65 94 71 4 Check the DC 13V Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 51: ... GND 4 D13 2V 5 D13 2V 6 D13 2V 7 A13 2V 8 A13 2V 9 GND 10 GND 11 DRV_ON 12 PDIM 1 Check D 13 2V 4 5 6 PIN 18 Pin Power Board Main Board SMAW200 H18S5K 1 GND 2 GND 3 PWR_ON 4 PDIM 2 5 GND 6 D13 2V 7 D13 2V 8 D13 2V 9 A13 2V 10 A13 2V 11 GND 12 GND 13 DRV_ON 14 PDIM 1 15 GND 16 SCLK 17 V SYNC 18 SIN 55 43 49 Check D 13 2V 6 7 8 PIN Copyright 2017 LG Electronics Inc All rights reserved Only for trai...

Страница 52: ... adjustment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A14 Established date Revised date Error symptom Content Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 53: ...ternal TV Speaker Check Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A15 Established date Revised date Error symptom Content Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 54: ...nual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video ALL MODELS A16 Established date Revised date Error symptom Content 12 Pin Power Board Main Board SMAW200 H12S5K 1 PWR_ON 2 PDIM 2 3 GND 4 D13 2V 5 D13 2V 6 D13 2V 7 A13 2V 8 A13 2V 9 GND 10 GND 11 DRV_ON 12 PDIM 1 18 Pin Power Board Main Board SMAW200 H18S5K 1 GND 2 GND 3 PWR_ON 4 PDIM 2 5 GND 6 D13...

Страница 55: ...2C for ALS DATA 17 SDA I2C for ALS CLK 18 GND GND 19 IR IR 20 LED LED 21 GND GND 22 VCC 3 5V Standby 23 KEY tact power 24 NC NC 25 GND GND IR Checking order 1 Check IR cable condition between IR Main board 2 Check the standby 3 5V 3 AS checking the Pre Amp IR LED light the power is in ON condition an Analog Tester needle should move slowly otherwise it s defective Checking order to check remote co...

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