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LG 27BK67U Service Manual
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LG 27BK67U Service Manual

Chassis : lm8ba
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LED MONITOR
SERVICE MANUAL
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70211506 (1807-REV00)
P/NO :
Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
LM8BA
27BK67U
CONFIDENTIAL

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Summary of Contents for LG 27BK67U

  • Page 1 SERVICE MANUAL CHASSIS : LM8BA MODEL : 27BK67U CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : P/NO : MFL70211506 (1807-REV00) Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 2: Table Of Contents

    SAFETY PRECAUTIONS ................ 3 SPECIFICATION ..................4 ADJUSTMENT INSTRUCTION ..............6 BLOCK DIAGRAM ................... 7 EXPLODED VIEW ..................8 DISASSEMBLY ..................9 TROUBLE SHOOTING GUIDE .............. 11 - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Safety Precautions

    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 training and service purposes.

  • Page 4: Specification

    Remark Customer BRAND BRAND : LGE Product B2C model name : 27UK670 2 User Model Name 27UK670 / 27BK67U B2B model name : 27BK67U Sale region Worldwide Feature 27 ”LCD MONITOR (IPS UHD) Chassis Name LM8BA PCB, Product spec., Adjustment spec.
  • Page 5 1440 H(Pixels) 66.66 4000 3840 266.64 3840 x 2160 V(Lines) 2222 2160 H(Pixels) 133.32 4000 3840 3840 x 2160 V(Lines) 2222 2160 Recommended Timing - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 12) è Recommended Timing (HDMI1.4) , HDMI ULTRA Deep Color : OFF l 13) è Recommended Timing (HDMI2.0) , HDMI ULTRA Deep Color : ON - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Adjustment Instruction

    3.1 ADC Process    ‐ 27UK670_27BK67U doesn’t need ADC process because it has only digital input like DisplayPort, HDMI.    3.2 Main PCB Function test      ‐ Check display/audio according to interface  3.3Write HDCP 2.2 Key  a. Write HDCP Key into Flash memory by using DDC2AB protocol & HDCP Adjustment Jig equipment.    HDCP 2.2 Write Command :    E9    AddressHigh    AddressLow    ex) E9 00 00    * There must be input signal. No input signal causes the HDCP Key write fail.    * HDCP 1.4 Key is embedded on scaler.    - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8                                             0x04      ‐      Set 4H    4.4 Factory calibration  Factory Calibration(2.2) : Gamma, dE, Color Temperature(6500k)  ‐ Reference Model: 27MU67/27UD68/27UD88/27UD58/27UD88/32UD89  ‐ Input: HDMI1/2 , Gray Pattern with Gamma correction using command using “Adjustment Command”  ‐ This model must be calibrated Gamma2.2  Gamma calibration and verify    - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 3) Press Menu(right‐side of OSD) button and can see Service Menu.    4.6 Check HDR (Don’t support)  ‐. Before the factory calibration, check the White balance according to below specification.    1) HDR Mode check (HDMI)  ‐. Equipment : MSPG‐7800  ‐. Check Point : HDR OSD but this OSD disapper in few seconds                                  - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 Super Resolution+ Picture Adjust Depending on input signal Picture Black Level (RGB: High) (YUV: Low) HDMI ULTRAHD Deep Color Response Time Fast Game Adjust FreeSync - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 Depend on the sale region Smart Energy Saving Power LED Automatic Standby Off(EU/EK/PD/EW/MA,4H) General DisplayPort1.2 Enable Buzzer OSD Lock OSD Size Small Deep Sleep Mode Information Reset   - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 Aging off &Clear elapsed time Aging On/Off FF/00 FF:ON / 00:OFF 0x90 0x90 : HDMI1 Input Select 0x91 0x91 : HDMI2 0xD0 0xD0 : DP - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 (2byte) + Ascii SN(18byte)) Read C/s of Serial data data Read checksum data of 24 byte 0x00 : OFF HDR Max Bright 0x01 : ON - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 0‐Page      0~7F    Read  2          80  0‐Page    80~FF    Read  3      A2  0  1‐Page      0~7F    Read  - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15         L : 0x00,0x10,….0x70    6.6.5 EDID Read  DDC2B Command.(A0/A1)  START START Data1 . . . Data128 A   STOP         ‐ 128 Byte transfer of EDID Buffer of    MICOM  - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Block Diagram

    USB 2.0 UP VBUS=5V / 0.9A CC communication DC-DC USB Type-C HDMI 1 HDMI 2 HP Out VBUS=5V / 0.9A ( HDMI 2.0 ) (DP1.2) - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 17: 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. - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 18: Trouble Shooting Guide

    Check IC705 Output Replace IC705 & Voltage Level (2.5V, 1.2V) Recheck Check X100 Clock Replace X100 27MHz Replace IC107 Flash Memory - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 P300 (#9, 10, 36, 37) Check FFC Cable for Damage or Replace FFCable Open Conductors Replace T-Con Board or Module - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 Check IC102 AUX Signal Replace the IC102 (#J1,H1) Check IC103 AUX Signal Replace the IC103 (#3,4) Replace the G-SYNC Module - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Check IC101 AUX Signal Replace the IC101 (#29,30) Check IC103 AUX Signal Replace the IC103 (#3,4) Replace the G-SYNC Module - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 PORT NO.:HDMI2 (HDMI2.0) HDMI2.0 SWITCH PORT NO.:HDMI1 (HDMI2.0) JK100 JK101 HDM2LB-19BG2RN3G HDM2LB-19BG2RN3G DATA2+ DATA2+ AR100 SEL1 SEL2 DATA2_SHIELD DATA2_SHIELD AR103 => HDMI 1 DATA2- HDMI1_RX2+ => HDMI 2 DATA2- +3.3V_NORMAL HDMI2_RX2+ HDMI1_RX2- DATA1+ HDMI2_RX2- DATA1+ HDMI1_RX1+ HDMI2_RX1+ DATA1_SHIELD HDMI1_RX1- DATA1_SHIELD HDMI2_RX1- DATA1- AR101...
  • Page 23 +5V_STANDBY P201 JOYESTICK KEY MODULE-eDP 05030HR-H30C1(G) L201 20151202 +3.3V_NORMAL BLM15PX121SN1 C_DET -> USBPD_EN WHITE LED OPTION +3.3V_NORMAL R263 L202 P200 BLM15PX121SN1 RED LED OPTION 12507WR-08L +3.3V_NORMAL AR210 R204 R225 R239 R297 R212 R238 3.3K 3.3K EDP3- DEBUG 4.7K R264 R210 R227 AR213 JP200...
  • Page 24 MAIN IC POWER LINE - CAPACITOR +3.3V_NORMAL +1.8V_DDR VDD_DRAM_A AVDD_PLL +1.15V_VDD_DDR_A L111 +1.15V_VDD close to Q1 close to Q1 L116 BLM15PX121SN1 BLM15PX121SN1 close to Q1 L100 BLM15PX121SN1 C175 C181 C187 C191 C196 C213 C255 10uF 10uF 0.1uF 0.1uF 0.1uF C233 C241 ->...
  • Page 25 SCALAR DC-DC BLOCK DC-JACK (STRAIGHT TYPE) +19V JP400 JK400 DS439-F01T1BA-A C409 C410 C404 0.1uF 68uF 68uF 105C 105C JP401 For Jig Test R400 100K PANEL_ON +10V_PANEL +19V R435 100K +19V +5V_STANDBY C414 IC402 0.1uF R442 MP2315S Setting: 10.40V(=0.8(1+120K/10K) IC405 5V_ST_ON MP2315S R401 L403...
  • Page 26 HEADPHONE AMP SPEAKER AMP (MAXX AUDIO) R500 IC503 TPA6138A2 1/8W A_GND A_GND SPEAKER L514 SPEAKER R501 +INR +INL 10.0uH SPEAKER P501 C550 C541 1/8W R518 C540 R542 250A1-WR-H04M R530 180pF 180pF C554 R547 R527 1/8W R502 -INR -INL +19V_AMP SPEAKER R569 HP_ROUT_MAIN HP_LOUT_MAIN...
  • Page 27 LED Driver 27" +19V +19V L602 D600 L605 D601 33uH BR210 33uH BR210 100V 100V C654 High : 1.5V High : 1.5V C658 10uF 10uF C633 C636 C616 C619 4.7uF 4.7uF 4.7uF 4.7uF D602 MP3378E mask revison SK510B_TSC D603 MP3378E mask revison R620 100V R644...
  • Page 28 USB Downstream PORT #2 (USB2=VBUS 1.5A) USB HUB Added serial Resistor for protected by damage from short JK701 U3A27C-09LM5YN25 Hyunseung Ku 150304 JP700 VBUS +3.3V_C +3.3V_C +1.1V_HUB USB2_D_PWR (C-Type connector : USB 3.0 Signal) (PD Controller : USB 2.0 Signal) R701 C708 USB 3.0 HUB...
  • Page 29 * SIGNAL DEFINITION POL : Mux Control based upon Cable Orientation TYPE-C_VBUS EN: Mux Enable PD Controller (TI) AMSEL: Alternate Mode Mux Config PD SPI DEBUG POINT 1.CLK 2.MOSI C816 C817 C819 C821 D801 3.MISO 0.01uF 0.01uF 0.01uF 0.01uF SMFB23H PD DEBUG POINT 4.CS 1.SDA...
  • Page 30 #PD & USB Down Stream Power USB PD POWER : 19V to 15V, 9V(3A) 19V TO 5V (USB Down Stream 0.9A *2EA) Vout(15.08V) = 0.8 X (1+R1/R2)// 9.16V , 15.3V R911 PD_USB_POWER_ON C917 USBPD_PP_HV +19V 0.1uF PD_9V_SEL L901 R986 R949 IC905 4.7uH +3.3V_C...
  • Page 31 UPDATE DPM_OFF +3.3V_NXP +3.3V_PD +3.3V_NXP R1026 AR1003 C1001 C1017 C1003 C1000 0.1uF 0.1uF 10uF 10uF DEBUG P1000 +3.3V_NXP 12507WS-06L C1004 C1018 C1006 MICOM_SWCLK 0.1uF 0.1uF 0.1uF MICOM_SWDIO R1000 UART_RX_DEBUG UART_TX_DEBUG DEBUG MICOM_SWDIO MICOM_RESET C1010 0.1uF +3.3V_NXP MICOM_SWCLK DEBUG R1014 UART_RX_DEBUG DEBUG R1005 R1015...