LG 75SJ8570 Page 44 Service Manual Download | Manualshive

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Advanced

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Channels



Channel Tuning



Manual Tuning

When the signal is strong,
use the attenuator (-10dB, -
15dB, -20dB etc.)

Standard Repair Process Detail Technical Manual

TUNER input signal strength checking method

A. Video error_Video error, video lag/stop

<ALL MODELS>

A3

Established

date

Revised

date

Error

symptom

Content

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Summary of Contents for 75SJ8570

Page 1: ...imile 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 Electronics ...

Page 2: ... 2 CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 9 BLOCK DIAGRAM 10 EXPLODED VIEW 17 DISASSEMBLY GUIDE 18 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ...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 antenna terminals phone jacks etc If the exp...

Page 4: ...rth 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 electrostatic charge buildup or expo sure of the assem...

Page 5: ...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 and adjacent components and the circuit boa...

Page 6: ...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 Video In...

Page 7: ...SA 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 UDTV 1080P 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 00 297 00 UDTV 2160P 14 4096 2160 53 95 23...

Page 8: ...0 HDTV 1080P 18 1920 1080p 33 75 30 00 79 20 HDTV 1080P 19 1920 1080p 56 25 50 00 148 5 HDTV 1080P 20 1920 1080p 67 43 59 94 148 35 HDTV 1080P 21 1920 1080p 67 5 60 00 148 50 HDTV 1080P 22 1920 1080p 112 5 100 297 00 UDTV 1080P 23 1920 1080p 134 86 119 88 296 70 UDTV 1080P 24 1920 1080p 135 00 120 297 UDTV 1080P 25 3840 2160p 53 95 23 98 296 70 UDTV 2160P 26 3840 2160p 54 24 00 297 00 UDTV 2160P 2...

Page 9: ...ing 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 finished the update below Pop up appear 6 T...

Page 10: ...ROM 256Kb USB2 2 0 USB3 2 0 eMMC 4GB 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 I2C CVBS SIF Tuner COMP ARC X_TAL 32 768kHz OCP 1 5A OCP 1 5A Component Spec Out HDMI4 2 0 Apply only CI Slot model 1 SOC ...

Page 11: ...B_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 Power detect PCM_5V_CTL 5V_CI_ON CI_IN_TS_SYNC ...

Page 12: ...ck 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 AMP NTP7515 Audio AMP NTP7515 AMP_MUTE...

Page 13: ...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 _H CEC_REMOTE Port_3 DDC_I2C_3 SPDIF_OUT_ARC HDMI_HPD_3 HDMI2 0 LGE PHY 5V 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_ARC_OUT 4 HDMI 2 0 ...

Page 14: ...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 GPIO105 MAN SOC 5 USB Wi Fi M Remote UART ...

Page 15: ... 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 Ω 33pF 6 I2C Map ...

Page 16: ...H VEPI VGL2 VCOM1 2 Level shifter CLK 1 8 60P EPI Output LEFT P gamma 8CH 0 60 P gamma 8CH CLK 1 8 CLK 1 8 VDD VEPI Vterm HVDD VCOM1 2 VGL1 2 VGH VST RESET VGH_E O VDD VEPI Vterm HVDD VCOM1 2 VGL1 2 VGH VST RESET VGH_E O LOCK CK_IN CLK 1 8 CLK 1 8 EPI 6 Lane EPI 6 Lane VCOM1FB VCOM2FB PANEL_VCC PANEL_VCC VDD Vterm VCOM1FB VCOM2FB VST RESET VGH_E O M16p 7 EPI block PMIC ...

Page 17: ...sential 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 200 400 540 521 530 200T 500 120 810 121 820 570 900 AR2 700 A10 A9 LV1 LV2 300 411 AS1 310 710 910 920 Stand Base Stand Body 200A ...

Page 18: ...k screw 1 1EA to separate Power Cord bracket from Back cover assembly And then Separate connector 1 1 from Power PCB Separate Dummy Cover 2 Unlock screw 3 21EA 4 4EA 5 1EA to separate back cover assembly from module 1 1 1 2 ...

Page 19: ... 19 Detach Tape 6 3EA 7 3EA 8 8EA Separate connectors 9 19 from PCB 7 6 7 6 8 8 8 8 8 7 6 11 9 10 15 16 17 18 13 12 14 19 ...

Page 20: ... separate from module And then separate Main Chassis Power Chassis from module And then separate Middle Cabinet Assy from module Unlock screw c 4EA to separate guide from module Detach Insulation sheet d 1EA fromStand module c c c c d ...

Page 21: ... 21 Unlock screw e 10EA and then separate each part Detach Tape f 2EA Unlock screw e 2EA and then separate each part Separate Cable Cover from Body Top e e e e e e e e e e e e f f g ...

Page 22: ... 22 Unlock screw h 2EA to separate Cable Bracket from Body Top Unlock screw I 5EA to separate Stand Top from Stand Base Left Right h h i i i i i ...

Page 23: ...TROUBLE SHOOTING GUIDE ...

Page 24: ...ror 5 6 B Power error No power 6 7 Off when on 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...

Page 25: ...lace Inverter or module N Repair Power Board or parts End Always 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 16 Error symptom A Video error No video Normal audio A18 A1 A18 A4 A2 First of all Check whether all of cables between board is inserted pr...

Page 26: ...ltages of Power Board 20V 13 2V No Video No 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 A18 Established date Revised date 2 16 Error symptom 2 ...

Page 27: ... Different maker TV etc SVC Bulletin Replace Main B D Check Tuner soldering Normal Picture Y N Y Close Y Close By using Digital signal level meter By using Diagnostics menu on OSD Advanced 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...

Page 28: ...ice Cable normal External Input Component error Check external device and cable Y External device Cable normal HDMI error Check external device and cable Replace Main T con B D Replace Main T con 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 A8 A7 Standard Repair Process Established date Revised date 4 16 Error s...

Page 29: ...tion of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc N Y Replace Main T con B D Screen normal Check screen condition by input External Input Component HDMI DVI Request repair for external device Component error HDMI DVI Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig patte...

Page 30: ...operly Check Logo LED Replace Power B D Measure 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 3 5V Replace Power B D N Y Normal voltage Replace Power B D Y A17 A18 A18 A18 Standard Repair Process Established date Revised date 6 16 Error symptom 6 Stand By Red or Turn On Operating Turn Off Close ...

Page 31: ...r off List Explanation Normal POWEROFF_REMOTEKEY Power off by REMOTE CONTROL POWEROFF_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 ...

Page 32: ...B 20V of Power Board Normal voltage Y N Replace Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A20 A21 A18 Disconnection Established date Revised date 8 16 Error symptom Standard Repair Process 8 ...

Page 33: ...recked audio Discontinuation Noise only for External 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 erro...

Page 34: ...ck R C Operating When turn off light in room Check Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A22 Normal Voltage Close 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 A18 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A22 Replace Main B D Y A22 Standard Repair Proce...

Page 35: ...e Close N N N Y Standard Repair Process Established date Revised date 11 16 Error symptom 11 Replace MR13 Turn off on the set and press the wheel Press the back key about 5sec Close If you conduct the loop at 3times change the M4 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Down load the Firmware INSTART MENU 14 RF Remocon Test 3 Firmware download Y RF Rece...

Page 36: ...RT menu Wi Fi Mac value is NG Y Check Repair Wifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 12 16 Error symptom 12 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A23 A4 A4 A24 ...

Page 37: ...ternal Input and Component Recognition error Check and 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 ...

Page 38: ...fer to the KMS fix information and then proceed 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 noi...

Page 39: ...ior damage Module damage Cabinet damage Replace 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 ...

Page 40: ...hod A3 4 Version checking method A4 5 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 EPI reconnection condition A7 8 Adjustment Test pattern ADJ Key A8 9 Appendix Defected Type caused by T Con Inverter Module Exchange Main Board 1 A 1 5 10 Exchange Main Board 2 A 2 5 11 Exchange Power Boa...

Page 41: ...r error_Off when on off while viewing POWER OFF MODE checking method A19 17 C Audio error_ No audio Normal video Checking method in menu when there is no audio A20 18 Voltage and speaker checking method when there is no audio A21 19 D Function error Remote control operation checking method A22 20 Motion Remote operation checking method A23 21 Wifi operation checking method A24 Continued from previ...

Page 42: ...Technical Manual Revised date A1 Error symptom Content Check LCD back light with naked eye A Video error_No video Normal audio After turning on the power and disassembling the case check with the naked eye whether you can see light from front side A1 ...

Page 43: ...nt Check White Balance value A Video error_No video Normal audio A2 Entry method 1 Press the ADJ button on the remote control for adjustment 2 Enter into White Balance 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 ALL MODELS ...

Page 44: ... signal is strong use the attenuator 10dB 15dB 20dB etc Standard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A3 Established date Revised date Error symptom Content A3 ...

Page 45: ...ersion checking method A Video error_Video error video lag stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version ALL MODELS A4 Established date Revised date Error symptom Content A4 ...

Page 46: ...he external device is connected 2 After measuring each voltage from power supply finally replace the MAIN BOARD Standard Repair Process Detail Technical Manual TUNER checking part A Video error_Video error video lag stop ALL MODELS A5 Established date Revised date Error symptom Content A5 ...

Page 47: ...anual Cconnection diagram 1 A Video error _Vertical Horizontal bar residual image light spot As the part connecting to the external input check the screen condition by signal A6 Established date Revised date Error symptom Content A6 ALL MODELS ...

Page 48: ...echnical Manual Check Link Cable VX1 reconnection condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content A7 ALL MODELS ...

Page 49: ...ADJ Key A Video error_Color error You can view 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 A8 Established date Revised date Error symptom Content A8 ...

Page 50: ... Broken T Con Defect CNT Broken Solder defect 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 ...

Page 51: ...rmal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange Main Board 2 A 2 5 ...

Page 52: ...Appendix Exchange Power Board PSU No Light Dim Light Dim Light Dim Light No picture Sound Ok A 3 5 ...

Page 53: ...A 4 5 Appendix Exchange the Module 1 Crosstalk Crosstalk Press damage Press damage Un repairable Cases In this case please exchange the module Press damage ...

Page 54: ...C Defect Vertical Line Source TAB IC Defect 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 A 5 5 Un repairable Cases In this case please exchange the module ...

Page 55: ...rd Repair Process Detail Technical Manual Check front Power Indicator B Power error _No power A17 Established date Revised date Error symptom Content A17 ST BY condition On or Off Power ON condition Turn Off ...

Page 56: ...ished date Standard Repair Process Detail Technical Manual Revised date A18 Error symptom Content Check power input voltage and ST BY 3 5V B Power error _No power A18 Check the DC 13 2V line for ST BY Voltage ...

Page 57: ... for adjustment 2 Check the entry into 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 A19 Established date Revised date Error symptom Content A19 2014 11 25 ...

Page 58: ...the Sound function of the Menu 3 Select the Sound Out 4 Select TV Speaker Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A20 Established date Revised date Error symptom Content A20 ...

Page 59: ...aker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video A21 Established date Revised date Error symptom Content A21 1 SPK_R FT 7 SPK_L _TW 2 SPK_R FT 8 SPK_L _TW 3 SPK_L FT 9 SPK_R _CT 4 SPK_L FT 10...

Page 60: ...ctive Standard Repair Process Detail Technical Manual Remote control operation checking method D Function error A22 Established date Revised date Error symptom Content A22 Checking order to check remote control IR EYE Sensor IR LOGO light Rear Pin Pin name 1 LED_R 2 GND 3 IR 4 3 5V_ST 5 GND 6 GND 7 EYE_SCL 8 KEY2 9 EYE_SDA 10 KEY1 11 12 GND 13 GND 14 GND 15 Device 16 Wakeup Host 17 Power on 18 GND...

Page 61: ...Check BT Wifi cable condition between BT Wifi assy Main board 2 Check the 3 5V on the terminal 24 Checking order to check motion remote wifi Wifi BT Front Wifi BT Rear Pin Pin name 1 LED_R 2 GND 3 IR 4 3 5V_ST 5 GND 6 GND 7 EYE_SCL 8 KEY2 9 EYE_SDA 10 KEY1 11 12 GND 13 GND 14 GND 15 Device 16 Wakeup Host 17 Power on 18 GND 19 3 5_Wifi 20 Wifi DP 21 Combo Reset 22 Wifi DM 23 GND 24 3 5_Wifi ...

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