LG 55EG9A7V-ZB Service Manual

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OLED TV

SERVICE MANUAL

CHASSIS : ED79A

MODEL : 55EG9A7V

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL70179701 (1703-REV00)

CONFIDENTIAL

55EG9A7V-ZB

Summary of Contents for LG 55EG9A7V-ZB

Page 1 OLED TV SERVICE MANUAL CHASSIS : ED79A MODEL : 55EG9A7V 55EG9A7V-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL70179701 (1703-REV00) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................13 BLOCK DIAGRAM ................... 14 EXPLODED VIEW .................. 20 DISASSEMBLY GUIDE................21 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 3 When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics. Inc. All rights reserved. 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. Only for training and service purposes.
Page 6 TELSAT1R 50.0W, INTELSAT903 33.5W , INTELSAT904 60.0E , NILESAT 7.0W , NSS12 57.0E , THOR 0.8W , TURKSAT 42.0E , YAMAL201 90.0E , OTHER - 6 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 7 DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8 DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10 Input Voltage AC 100 ~ 240V 50/60Hz - 7 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 8 33.75 30.00 79.20 HDTV 1080P 1920*1080 56.25 50.00 148.50 HDTV 1080P 1920*1080 67.43 59.94 148.35 HDTV 1080P 1920*1080 67.50 60.00 148.50 HDTV 1080P - 8 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 9 31.25 50.00 27.00 17,18 Side-by-side(half) Secondary(SDTV 576P) Side-by-side(Full) (SDTV 576P) 720*576 Frame packing Secondary(SDTV 576P) 62.50 50.00 54.00 17,18 Line alternative (SDTV 576P) - 9 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 10 (HDTV 1080P) Top-and-Bottom Primary(HDTV 1080P) 56.25 50.00 148.50 Side-by-side(half) Secondary(HDTV 1080P) Top-and-Bottom Primary(HDTV 1080P) 67.43 / 67.50 59.94/ 60.00 148.35/148.50 Side-by-side(half) Secondary(HDTV 1080P) - 10 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 11 Checker Board, Frame Sequential, Row Interleaving, Column Interleaving 640*350 720*400 2D to 3D, Others 640*480 Side by Side(half), 800*600 Top & Bottom 1152*864 - 11 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 12 2D to 3D, Side by Side(Half), 1920*1080 Top & Bottom, 56.25 50.00 148.50 HDTV 1080P Checker Board, 60.00 Single FrameSequential, 135.00 (HDMI1,HDMI2 594.00 Row Interleaving, Only) Column Interleaving - 12 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 13 (7) Click [Yes] : TV will be DC OFF -> ON (8) After TV turned on, Check the updated SW Version and Tool Option. - 13 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 20 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. - 20 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 21 DISASSEMBLY GUIDE 1. Put the set on the flat pad. 2. Remove Rear Small Cover Pull up bottom of Rear Small Cover to remove. - 21 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 22 4. Remove Back Cover Screw Pull up Power Cord, than remove FAB31843216 (M3*5.5mm, Gray) 9EA Bracket, next remove cord from PSU. FAB31843216 (M3*5.5mm, Gray) 1EA - 22 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 25 E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 26 ☞A4 & A2 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 27 Check various voltages Check and of Power Board (Main) Normal No Video/ replace voltage? No audio (20V, 12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 28 1. Reconnection 2. Install Booster S/W Upgrade Normal Contact with signal distributor Picture? or broadcaster (Cable or Air) Normal Picture? Replace Main B/D Close Close Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 29 /Cable device and error normal cable Request repair for external device/cable Check external External device HDMI device and Replace Main B/D /Cable error cable normal Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 30 (Check normal operation of HDMI/ Main B/D / normal? External Input, Component, Module RGB and HDMI/DVI by Normal connecting Jig, pattern screen? Generator ,Set-top Box etc. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 31 Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY (7.8V) voltage? ☞A9 Replace Power B/D Replace Power Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 32 "POWER_OFF_BY_UNKNOWN" 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 33 20V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection connecting Speaker Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 34 (In case of Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 35 Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Close Explain the customer operating? cause is interference from light in room. Replace R/C Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 36 Replace MR15RA Close Down load the Firmware •If you conduct the loop at 3times, * INSTART MENU12.RF change the MR15RA. Remocon Test Receiver Firmware download Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 37 INSTART menu Voltage? 1pin Main B/D ☞A14 Check & Repair Close Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 38 Recognition error signal - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 39 “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 40 Exchange Main Board (2) A-2/5 <Appendix> Exchange Power Board (PSU) A-3/5 Defected Type caused by T-Con/ Power / Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 41 Voltage and speaker checking method when there is no audio Remote control operation checking method D. Function error Motion Remote operation checking method E. Etc Adjustment Test pattern Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 42 Vx1 Lock check date R7277 : 0[V] Check a voltage of R7277 after turn on the TV. If the voltage is low, Vx1 is locked.(OK) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 43 2. Enter into White Balance of item 12. 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 Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 44 Content date All Settings  Channels  Channel Tuning  Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 45 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content Version check date Version Push instart button Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 46 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. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 47 Revised Revised Content Content TV connection diagram Connection diagram date date As the part connecting to the external input, check the screen condition by signal Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 48 A. Video error_Color error symptom date Revised Content Check Link Cable (Vx1) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 49 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 A - 1/5 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 50 Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION A - 2/5 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 52 Appendix : Exchange the Module (1) Line Dim Vertical abnormal display Brightness difference Crosstalk Press damage Crosstalk Burnt A - 4/5 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 53 Appendix : Exchange the Module (2) Angle view Color difference Brightness dot noise Half dead Brightness difference Green Noise on power on/off time Line Defect A - 5/5 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 54 Established B. Power error _No power symptom date Revised Check front Power Indicator Content date ST-BY condition: On or Off Power ON condition: Turn Off Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 55 Check power input Voltage & ST-BY 3.5V date Check the DC 12VM line for ST-BY Voltage Power To Main B’d (ST-BY : 7.8V, Normal : 12V) P202 Power To Module P201 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 56 <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 (Power On/Off Status) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 57 1. Press the Setting button on the remote control 2. Select the Sound function of the Menu 3. Select the Sound Out 4. Select TV Speaker Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 58 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. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 59 2. Check the standby 3.5V on the terminal 22 pin (③) 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. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 60 +3.5V_WIFI Wifi & BT Rear ③ Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 6 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 61 You can view 11 types of patterns using the CH+ or - 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!) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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