LG OLED55B7A Service Manual Download Page 55

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Standard Repair Process Detail Technical Manual

Voltage and speaker checking method
when there is no audio

C. Audio error_No audio/Normal video

A12

Established

date

Revised

date

Error

symptom

Content

A12

②

Checking order when there is no audio

①

Check the contact condition of or 20V connector of Main Board

②

Measure the 20V input voltage supplied from Power Board

(If there is no input voltage, remove and check the connector)

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.

SPK_R-_FT

SPK_R+_FT

SPK_L-_FT

SPK_L+_FT

SPK_R-_CT

SPK_R+_CT

SPK_L-_CT

SPK_L+_CT

①

②

Only for training and service purposes.

Summary of Contents for OLED55B7A

Page 1: ...ail facsimile or other 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 Elec...

Page 2: ...ights 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 16 DISASSEMBLY GUIDE 17 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 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 ...

Page 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...

Page 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...

Page 6: ...t be operated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL CSA CE IEC specification EMC FCC ICES CE IEC specification 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 CAD...

Page 7: ...6 59 94 25 17 VESA VGA 4 800 600 37 87 60 31 40 VESA SVGA 5 1024 768 48 36 60 00 65 VESA XGA 6 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 9 1920 1080 67 5 60 158 40 WUXGA Reduced Blanking 10 1920 1080 135 120 297 11 3840 2160 54 24 00 297 00 UDTV 2160P 12 3840 2160 56 25 25 00 297 00 UDTV 2160P 13 3840 2160 67 5 30 00 ...

Page 8: ...1 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 26 3840 2160 54 24 00 297 00 UDTV 216...

Page 9: ... About This TV page for update 5 TV is updating 6 After finished the update below Pop up appear 7 Click Yes TV will be DC OFF ON 8 After TV turned on Check the updated SW Version and Tool Option 2 NSU This Function is needed to connect to the internet 1 Menu All Settings General About This TV 2 Click CHEK FOR UPDATES system check newest version 3 Click DOWNLOAD AND INSTALL 4 TV is updating 5 After...

Page 10: ...2MB X 2EA HDMI1 2 0 HDMI2 2 0 HDMI3 2 0 SYSTEM EEPROM 256Kb USB2 2 0 USB3 2 0 eMMC 8GB Sub Micom DDR3 2133 X 16 512MB X 2EA P_TS X_TAL 24MHz I2S Out H P AV D Demod I2C 2 R E A R S I D E R E A R H HP AMP SPDIF OUT BLUTOOTH IR KEY EYE WIFI SUB ASSY IR KEY Tuner I2C 5 X_TAL 25MHz I2C CVBS SIF Tuner COMP ARC X_TAL 32 768kHz OCP 1 5A OCP 1 5A Component H PSpec Out HDMI4 2 0 1 SOC ...

Page 11: ...3 IF_P 7 IF_N 8 AB28 TP_DVB_DATA0 AC28 TP_DVB_DATA1 AD28 TP_DVB_DATA2 AD29 TP_DVB_DATA3 AE29 TP_DVB_DATA4 AE30 TP_DVB_DATA5 AF29 TP_DVB_DATA6 AF30 TP_DVB_DATA7 3 3V_TUNER 1 2KΩ 33 Ω TPO_DATA 0 7 CI_IN_TS_DATA 0 7 CI Slot 100 Ω TPI_DATA 0 7 CI_TS_DATA 0 7 PCM_WE PCM_OE PCM_IRQA PCM_REG PCM_INPACK PCM_WAIT PCM_RESET CI_TS_DATA 0 7 CI_ADDR 0 14 PCM_IORD PCM_IOWR PCM_CE1 2 CI_TS_VAL CI_CD1 2 CI 5V Pow...

Page 12: ...C COMP2_Pr_IN_SOC JACK AV A A 1 ACK Jack Side SOC Side SPDIF_OUT SPDIF OUT H P JACK HP_LOUT_JACK HP_ROUT_JACK AM14 IEC958OUT AL15 AUDA_OUTL AM15 AUDA_OUTR SPDIF_OUT_ARC PHY0_ARC_OUT COMP2 AV_L_IN COMP2 AV_R_IN AL18 AUAD_L_CH2_IN AM18 AUAD_R_CH2_IN AUAD_L_CH2_IN AUAD_R_CH2_IN HP AMP TPA6138 ARC OUT HDMI2 Front Speaker Woofer Speaker MICOM AMP_RESET SCK LRCK DACLRCH I2C_SCL_0 SDA_0 I2S GPIO23 Audio ...

Page 13: ...MI_HPD_2 CEC_REMOTE Port_1 DDC_I2C_1 HDMI_HPD_1 HDMI2 0 LGE PHY HDCP1 4 HDCP2 2 HDCP1 4 HDCP 2 2 HDMI2 0 LGE PHY HDMI2 0 LGE PHY 5V 5V 5V HDMI 4 2 0 _H HDCP1 4 HDCP2 2 HDMI 3 2 0 _V CEC_REMOTE Port_3 DDC_I2C_3 SPDIF_OUT_ARC HDMI_HPD_3 HDMI2 0 LGE PHY HDMI2_3_HPD HDMI2_3_SDA HDMI2_3_SCL HDMI2_2_HPD HDMI2_2_SDA HDMI2_2_SCL HDMI2_1_HPD HDMI2_1_SDA HDMI2_1_SCL HDMI2_0_HPD HDMI2_0_SDA HDMI2_0_SCL PHY0_...

Page 14: ...IFI_POWER_ON USB2_2_DP0 DM0 SOC_RX TX USB3_0_DP0 DM0 USB3_0_RX0_P M USB2_1_DP0 DM0 USB2 0_2_DP1 DM1 USB2 0_3_DP0 DM0 USB2_0_DP0 DM0 UART1_RXD TXD Debug Wafer UART1_RX TX JK6200 RS232C phone Jack SOC_RX TX UART wafer SOC_RX TX US model only USB 1 3 0 _V USB 2 2 0 _H USB 3 2 0 _H WIFI_EN 3 5V_WIFI OCP GPIO90 USB_CTL1 5V_USB_1 OCP GPIO95 USB_CTL2 5V_USB_2 OCP GPIO34 USB_CTL3 5V_USB_3 UART0_TXD GPIO10...

Page 15: ...OM 33Ω LNB IR KEY EYE 100Ω 3 3KΩ EYE_I2C_SDA EYE_I2C_SCL 3 5V_ST 33pF 18pF Cap Ready I2C_SCL4 AJ21 SCL4 I2C_SDA4 AH21 SDA4 I2C_SCL1 AK22 SCL1 I2C_SDA1 AJ22 SDA1 I2C_SCL3 AH24 SCL3 I2C_SDA3 AJ24 SDA3 I2C_SCL0 AK23 SCL0 I2C_SDA0 AJ23 SDA0 I2C_SCL2 AH23 SCL2 I2C_SDA2 AH22 SDA2 I2C_SCL5 AH25 SCL5 I2C_SDA5 AH26 SDA5 Tuner 1 2KΩ EU 3 3V_TU 33Ω 47pF 3 3V_NORMAL 3 3KΩ PMIC EPI WAFER Vx1 33 Ω AUDIO AMP 100...

Page 16: ...teristics 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 200 400 540 521 200T 120 121 710 700 A10 AR2 920 900 810 571 LV1 LV2 570 500 530 ...

Page 17: ...7 Copyright LG Electronics Inc All rights reserved Only for training and service purposes DISASSEMBLY GUIDE Put the set on the flat pad Remove Rear Small Cover Pull up bottom of Rear Small Cover to remove ...

Page 18: ...emove Stand Screw and Stand FAB30016103 M4 12mm 4EA Remove Screw 4EA first next remove Stand Remove Back Cover Screw FAB31843216 M3 5 5mm Gray 9EA Common use 55 65 Remove PowerCord Bracket FAB31843216 M3 5 5mm Gray 1EA Add only 55 Pull up Power Cord than remove Bracket next remove cord from PSU ...

Page 21: ... off while viewing power auto on off 7 8 C Audio error No audio Normal video 8 9 Wrecked audio discontinuation noise 9 10 D Function error Remote control Local switch checking 10 MR15RA operating checking 11 11 12 Wifi operating checking 12 13 External device recognition error 13 14 E Noise Circuit noise mechanical noise 14 15 F Exterior error Exterior defect 15 First of all Check whether there is...

Page 22: ...ways check record S W Version and White Balance value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 15 Error symptom A Video error No video Normal audio A9 A9 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D Vx1 Cable Speaker Cable IR B D C...

Page 23: ...audio Check and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A9 Established date Revised date 2 15 Error symptom 2 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 24: ...g By using Digital signal level meter By using Diagnostics menu on OSD All Settings Channels Channel Tuning Manual Tuning Check the Signal Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N Normal Picture Y Close N A4 Standard Repair Process Established date Revised date 3 15 Error symptom 3 N Y Close N S W Up...

Page 25: ...ck external device and cable Y External device Cable normal HDMI error Check external device and cable Replace Main B D Replace Main B D N N A Video error Color error A6 N Y End Replace module Request repair for external device cable Color error Check Test pattern A15 A7 Standard Repair Process Established date Revised date 4 15 Error symptom 4 Copyright 2017 LG Electronics Inc All rights reserved...

Page 26: ...I by connecting Jig pattern Generator Set top Box etc N Y Replace Main B D Module Screen normal Check screen condition by input External Input AV HDMI DVI Request repair for external device HDMI DVI Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc Replace Main B D Module Screen normal N Y...

Page 27: ...ure voltage of each output of Power B D N Y Normal voltage Replace Main B D Y OK Replace Main B D N Y Normal Check ST BY 7 8V Replace Power B D N Y Normal voltage Replace Power B D Y A8 A9 A9 A9 Standard Repair Process Established date Revised date 6 15 Error symptom 6 Stand By Red or Turn On Operating Turn Off Close Copyright 2017 LG Electronics Inc All rights reserved Only for training and servi...

Page 28: ...TE CONTROL POWER_OFF_BY_OFF_TIMER Power off by OFF TIMER POWER_OFF_BY_SLEEP_TIMER Power off by SLEEP TIMER POWER_OFF_BY_INSTOP Power off by INSTOP KEY POWER_OFF_BY_AUTO_OFF Power off by AUTO OFF POWER_OFF_BY_ON_TIMER Power off by ON TIMER POWER_OFF_BY_RS232C Power off by RS232C POWER_OFF_BY_RESREC Power off by Reservated Record POWER_OFF_BY_RECEND Power off by End of Recording POWER_OFF_BY_SW_DW P...

Page 29: ...Power Board and repair parts Check Speaker disconnection N Y connecting Speaker Replace MAIN Board End C Audio error No audio Normal video A11 A12 A9 Disconnection Established date Revised date 8 15 Error symptom Standard Repair Process 8 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 30: ...ternal Input Connect and check other external device N Y Normal audio Check and fix external device Replace Power B D N Y Normal voltage Check input signal RF External Input signal Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 20V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B...

Page 31: ...heck Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A13 Normal Voltage Close N N Check 7 8V on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A9 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A13 Replace Main B D Y A13 Standard Repair Process Established date Revised date 10 15 Error sy...

Page 32: ...l Is show ok message N N N Y Replace MR15RA Turn off on the set and press the wheel Press the back key about 5sec If you conduct the loop at 3times change the MR15RA Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Down load the Firmware INSTART MENU 12 RF Remocon Test Receiver Firmware download Y RF Receiver ver is 00 00 N A14 A4 A4 Close Close Close Close 11 ...

Page 33: ...ifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 12 15 Error symptom 12 Change the Wifi assy Normal Voltage Y Y N Replace Main B D Wi Fi Mac value is NG N A14 A4 A4 A14 Close Close Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 34: ... fix external device cable HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information D Function error External device recognition error Established date Revised date 13 15 Error symptom Standard Repair Process 13 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 35: ...d as shown in the solution manual For models without any fix information provide the description 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 14 15 Error s...

Page 36: ...e cabinet Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 15 15 Error symptom Standard Repair Process 15 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 37: ... Tuner Checking Part A5 6 A Video error _Vertical Horizontal bar residual image light spot Connection diagram A6 7 A Video error_ Color error Check Link Cable Vx1 reconnection condition A7 8 Adjustment Test pattern ADJ Key A15 9 Appendix Defected Type caused by T Con Power Module Exchange Main Board 1 A 1 5 Exchange Main Board 2 A 2 5 Exchange Power Board PSU A 3 5 Exchange Module 1 A 4 5 Exchange...

Page 38: ... MODE checking method A10 13 C Audio error_ No audio Normal video Checking method in menu when there is no audio A11 14 Voltage and speaker checking method when there is no audio A12 15 D Function error Remote control operation checking method A13 16 Motion Remote operation checking method A14 17 E Etc Adjustment Test pattern A15 Continued from previous page Copyright 2017 LG Electronics Inc All r...

Page 39: ...d date A1 Error symptom Content Check Vx1 lock A Video error_No video Normal audio A1 Check a voltage of R7624 after turn on the TV If the voltage is low Vx1 is locked OK R7624 0 V Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ...ideo Normal audio A2 Entry method 1 Press the ADJ button on the remote control for adjustment 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 41: ...o error_Video error video lag stop A3 Established date Revised date Error symptom Content A3 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 42: ...Video error video lag stop 1 Checking method for remote control for adjustment Version A4 Established date Revised date Error symptom Content A4 Press the IN START with the remote control for adjustment Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ...Revised date Error symptom Content A5 Checking method 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 44: ...ror _Vertical Horizontal bar residual image light spot A6 Established date Revised date Error symptom Content A6 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 45: ...nnection condition A Video error_Color error A7 Established date Revised date Error symptom Content A7 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 46: ...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 Main Board 1 A 1 5 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ...normal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange Main Board 2 A 2 5 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ...normal display Line Dim Crosstalk Crosstalk Press damage Brightness difference Burnt Un repairable Cases In this case please exchange the module A 4 5 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...s case please exchange the module Angle view Color difference Brightness dot noise Half dead Green Noise on power on off time Line Defect Brightness difference A 5 5 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 51: ...ck front Power Indicator B Power error _No power A8 Established date Revised date Error symptom Content A8 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 52: ...or symptom Content Check power input voltage and ST BY 3 5V B Power error _No power A9 Check the DC 12VM line for ST BY Voltage ST BY 7 8V Normal 12V Power To Main B d Power To Module P202 P201 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 53: ...f whiling viewing A10 Established date Revised date Error symptom Content A10 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 54: ...io Normal video A11 Established date Revised date Error symptom Content A11 Checking method 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 55: ...V connector of Main Board Measure the 20V input voltage supplied from Power Board If there is no input voltage remove and check the connector 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 1 SPK_R _FT 2 SPK_R _FT 3 SPK_L _FT 4 SPK_L _FT 5 SPK_R _CT 6 SPK_R _CT 7 SPK_L _CT 8 SPK_L _CT Copyright 2017...

Page 56: ...in ON condition an Analog Tester needle should move slowly otherwise it s defective Pin Pin name 1 3 5V_WIFI 2 WIFI_DM_JACK 3 WIFI_DP_JACK 4 GND 5 WOL WIFI_POWER_ON 6 3 5V_WIFI 7 COMBO_RESET_JACK 8 GND 9 BT_WAKEUP_DEVICE_JACK 10 BT_WAKEUP_HOST_JACK 11 GND 12 GND 13 NC 14 NC 15 NC 16 EYE_SDA_JACK 17 EYE_SDA_JACK 18 GND 19 IR_JACK 20 LED_R_JACK 21 GND 22 3 5V_ST 23 KEY2_JACK 24 KEY1_JACK 25 GND IR E...

Page 57: ... 6 Wifi BT Front Wifi BT Rear Checking order to check motion remote wifi Pin Pin name 1 3 5V_WIFI 2 WIFI_DM_JACK 3 WIFI_DP_JACK 4 GND 5 WOL WIFI_POWER_ON 6 3 5V_WIFI 7 COMBO_RESET_JACK 8 GND 9 BT_WAKEUP_DEVICE_JACK 10 BT_WAKEUP_HOST_JACK 11 GND 12 GND 13 NC 14 NC 15 NC 16 EYE_SDA_JACK 17 EYE_SDA_JACK 18 GND 19 IR_JACK 20 LED_R_JACK 21 GND 22 3 5V_ST 23 KEY2_JACK 24 KEY1_JACK 25 GND Copyright 2017 ...

Page 58: ...n 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 A15 Established date Revised date Error symptom Content A15 1 2 3 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

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