LG LA74 Z Series Manual
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LG LA74 Z Series Manual

LG LA74 Z Series Manual

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2013 LED/LCD TV
Engineering guide
< Applicable Model : Mid-end Platform >
XXLA74*-Z*
XXLA71*-Z*
XXLA69/66*-Z*
XXLA64/62/61*-Z*
XXLN57*-Z*
Copyright © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
1 / 88
LGE Internal Use Only

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  • Page 1 2013 LED/LCD TV Engineering guide < Applicable Model : Mid-end Platform > XXLA74*-Z* XXLA71*-Z* XXLA69/66*-Z* XXLA64/62/61*-Z* XXLN57*-Z* Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 1 / 88 Only for training and service purposes...
  • Page 2 5. New sub ass’ys - Instruction of new sub ass’ys 6. Adjust way of new features 7. Repair guide Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 2 / 88 Only for training and service purposes...
  • Page 3 Better reliability on common noise • No data skew and better EMI margin • Fewer lines than mini-LVDS • Slim PCB design Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 3 / 88 Only for training and service purposes...
  • Page 4 10mm) helps slimmer TV - FHD 120Hz 10Bit : 594Mbps@36Lines → 1.65Gbps@12Lines - FHD 240Hz 10Bit : 594Mbps@72Lines → 1.25Gbps@32Lines Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 4 / 88 Only for training and service purposes...
  • Page 5 • Clock skew • Transmission Overhead Demerit • EMI due to clock lines : 4bit delimiter • Bandwidth limit Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 5 / 88 Only for training and service purposes...
  • Page 6 From Smart phone to TV Samrt phone close to NFC Tag Player choose From TV to Smart phone Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 6 / 88 Only for training and service purposes...
  • Page 7 Main processor, DDR Memory eMMC Memory Micom for Key/IR sensing WIFI/BT PMIC Key+IR Audio AMP Front Spk EPI Wafer Level shifter Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 7 / 88 Only for training and service purposes...
  • Page 8 SCART IR / NFC SPDIF OUT OPTIC ASSY ETHERNET WIFI USB_WIFI LOGO LIGHT Sub Micom I2C 3 (RENESAS R5F1000G) X_TAL 32.768KHz Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 +3.3V_Normal I2C_SDA1 IC8101 100Ω 33Ω I2C_SCL1 NTP7513(AMP) 2.7KΩ P7600 I2C_SDA6 33Ω 33Ω 33Ω TUNER(D) Local dimming I2C_SCL6 IC101 22Ω HDCP EEPROM Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Power Block Diagram

    USB3(Max 1.2A) MTK (AVDD3V3) NTP_7400(PVDD1) MTK(AVDD3V3_MEMPLL NTP_7400(PVDD2) MTK(AVDD3V3_LVDS) MTK(AVDD33_STB) AUDIO AMP USB1(DVR Max 1.5A) 5V USB 3A EARPHONE AMP EMMC(VCC) EMMC(VCCQ) TUNER(+3.3V_TU) Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 AN27 [ADCINN_DEMOD] R35[CI_TSDATA0] TS_OUT_SYNC TUNER_SIF(for T2/C/S) MT5398_TS_IN[0-7] CI_TS_DATA[0-7] TU_CVBS(for 47 Ω [GPIO34-41] TS_OUT[0-7] T2/C/S) IF_AGC MT5398_TS_OUT[0-7] CI_MDI[0-7] [GPIO18-25] 47 Ω TS_IN[0-7] Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 [AIN1_L/R_AADC] JK4600 TU_CVBS TU_CVBS Tuner [CVBS1P] TUNER_SIF, IF_P/N TUNER_SIF, IF_P/N [MPXP, ADCINP_DEMOD, ADCINN_DEMOD] Parallel TS / ERROR,VAL,SYNC,CLK Parallel TS / ERROR,VAL,SYNC,CLK Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Audio Out Block Diagram

    IC3000 MICOM TUNER_SIF TR BUF [MPXP] SIDE_HP_MUTE IC6100 HP_L/ROUT_MAIN HP_L/ROUT_AMP [AL0_ADAC] HEAD PHONE TPA6138A2PWR [AR0_ADAC] HP AMP JK3700 SPDIF_OUT [ASPDIF0] JK3602 Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 DDC_SDA_3_JACK SIL1292 TMDS Link 8bits TMDS Link or MHL Link HDMI3 5V_BUS 5V_MHL Q3001 HDMI_CEC MHL_DET X-tal RENESAS WOL_CTL 32.768kHz MICOM Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 VGH_EVEN/VGH_ODD VGH_F/VGH_R EPI Tx GCLK Block MCLK Z_Out VCOMRFB EPI CH4 +/- EPI CH5 +/- EPI CH6 +/- EPI_LOCK6 EPI_LOCK6_SOURCE GMA4/GMA5/GAM7/GMA12/GMA14/GMA15 Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 Negative Charge Pump Controller CTRLP Diode GAM4/5/7/12/14/15 6-Ch Gamma Buffer(DAC output) VCOM_P VCOM_N Vcom reference & gain VCOM_LOOP PMIC_RESET Reset PMIC TPS65178 Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 [U1TX] Motion Remote M_RFModule_RESET [ADIN4_SRV] Receiver [OPCTRL49] [OPCTRL50] HDMI2 SOC_TX [U0TX] 4Pin debugging [U0RX] SOC_RX wafer HDMI3 LGE 2122 RENESAS MICOM Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 Main / Module EPI Cable 50& 50Pin LED driver / PSU IR 8Pin Cable WiFi 6Pin + RF 8Pin Cable SPK Cable Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 1 / 88 Only for training and service purposes...
  • Page 19 Interconnection - 2 47LA660S-ZA [PCBs] IR Assy [Cables] IR to Local Key 3Pin Cable IR to Logo Assy 4Pin Cable Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 2 / 88 Only for training and service purposes...
  • Page 20 Introductions of 13Y RF ass’y + Magic Remote control 1. System 2. Remote Buttons 3. MR13 Block Diagram 4. Function List 5. Pairing/Un-pairing Method Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 3 / 88 Only for training and service purposes...
  • Page 21 • Motion Data : gyro, accelerometer  Voice Data Transmission • Period : 10msec • Voice sampling : 16khz 16bit Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 4 / 88 Only for training and service purposes...
  • Page 22 0x09 0x8009 AUTO_WAKEUP 0x800C VOICE_START 0x800A Logical VOICE_STOP 0x800D Buttons POINT_START 0x803E M4 Remote MR13 Remote POINT_STOP 0x803F Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 5 / 88 Only for training and service purposes...

  • Page 23: Power Management

    2.8V LDO AA x 2 Battery uP0108NEC5-28 TI TPS61097 uP0108NEC5-28 Connector SC70 SC70 SOT23-5 Bluetooth Receiver Bluetooth Remote control Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 6 / 88 Only for training and service purposes...

  • Page 24: Function List

    Battery Boost up Regulator LDO1 uP0108NEC5-28 RF, Gyro, Accelerometer Power Supply LDO2 uP0108NEC5-28 Audio Codec, Mic. Power Supply Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 7 / 88 Only for training and service purposes...
  • Page 25 5 sec. • After unpairing, LED should be blinked for 3sec. • The remote just becomes to IR mode. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 8 / 88 Only for training and service purposes...
  • Page 26 Introductions of 13Y WIFI built in ass’y 1. Wi-Fi built in Ass’y feature 2. Wi-Fi built in Ass’y specification Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 9 / 88 Only for training and service purposes...

  • Page 27: Block Diagram

    1.2V USB interface RX/TX Switch Antenna 2.4G/5G DM3030 DP, DN BCM43236B RX/TX Switch Antenna Crystal 2.4G/5G DM3030 20MHz Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 10 / 88 Only for training and service purposes...
  • Page 28 WIFI Built in ass’y Specification Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 11 / 88 Only for training and service purposes...
  • Page 29 2. HDCP 2.0 & NETFLIX? 3. DTCP? 4. Changed BOM 2012. 12. 08 LCD TV R&D Lab LCD TV / HW1 team Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 12 / 88 Only for training and service purposes...
  • Page 30 (Because operation unique key should be downloaded for Widevine , Widevine key dowmload by NSU is impossible.) [Widevine Key] Widevine Key is unique data stored TV for using Widevine. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 13 / 88 Only for training and service purposes...
  • Page 31  Netflix  the services maintain a huge selection of movies and latest releases and offer DVD rentals via mail & online streaming. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 14 / 88 Only for training and service purposes...
  • Page 32 •Exchage Key which is used to set up and protect content streams. •Content Key which is used to encrpt the content being exchanged. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 15 / 88...
  • Page 33 Changed Item : Separate HDCP check box. - HDCP 2.0 Tx - HDCP 2.0 Rx - HDCP 1.4 Rx Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 16 / 88 Only for training and service purposes...
  • Page 34 G. Network error Connection defect / Network speed low First of all, Check whether there is SVC Bulletin in GCSC System for these model. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 17 / 88...
  • Page 35 Other : PSU Inverter/ Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 18 / 88 Continue to the next page Only for training and service purposes...
  • Page 36 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 19 / 88 Only for training and service purposes...
  • Page 37 No Video/ replace voltage? No audio ( 3.5V,12V,20V or 24V…) MAIN B/D Replace Power Board and repair parts Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 20 / 88 Only for training and service purposes...
  • Page 38 Contact with signal distributor Normal Tuner soldering Picture? or broadcaster (Cable or Air) Normal Picture? Replace Main B/D Close Close Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 21 / 88 Only for training and service purposes...
  • Page 39 Normal (match with installed ANT) or broadcaster Picture? (Cable or Air) Normal Picture? Close Close Close Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 22 / 88 Only for training and service purposes...
  • Page 40 Check external RGB/ External device device and Replace Main B/D HDMI/DVI /Cable cable error normal Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 23 / 88 Only for training and service purposes...
  • Page 41 Main B/D External Input, Component, normal? HDMI/ RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 24 / 88 Only for training and service purposes...

  • Page 42: Power Error

    ※ Normal Replace Main B/D voltage? Close Normal Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 25 / 88 Only for training and service purposes...
  • Page 43 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 © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 26 / 88 Only for training and service purposes...
  • Page 44 Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 27 / 88 Only for training and service purposes...
  • Page 45 Connect and check Normal Check and fix other external device audio? external device Check and fix external device Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 28 / 88 Only for training and service purposes...
  • Page 46 If R/C operate, Normal Close operating? Explain the customer cause is interference from light in room. Replace R/C Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 29 / 88 Only for training and service purposes...

  • Page 47: Function Error

    Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 30 / 88 Only for training and service purposes...
  • Page 48 “Part related to nose” in the Owner’s Manual. (For models without any fix information, provide the description) Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 31 / 88 Only for training and service purposes...
  • Page 49 ☞A28 Cabinet Replace cabinet damage Remote Replace remote controller controller damage Stand Replace stand dent Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 32 / 88 Only for training and service purposes...

  • Page 50: Network Error

    (match with AP and ether setting) (WiFi = AP) Picture? (Wired = ethernet port) Normal Picture? Close Close Close Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 33 / 88 Only for training and service purposes...
  • Page 51 TV that is supported CI+ 1.3 Old version of CI+ 1.2 CAM  Check SVC Bulletin Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 34 / 88 Only for training and service purposes...
  • Page 52 D. Function error_ No response in Remote controller operation checking method remote controller, key error D. VCOM Adjustment Sequence of the Vcom adjustment Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 35 / 88 Only for training and service purposes...
  • Page 53 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. enter the value after replacing the MAIN BOARD. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 36 / 88...
  • Page 54 (Power Board ↔ Main Board) SMAW200-H24S Power on Inverter On/off 3.5V PWM Dim #1 3.5V PWM Dim #2 L/DIMO_VS L/DIM0_MOSI L/DIM0_SCLK Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 37 / 88 Only for training and service purposes...
  • Page 55 MENU  support  signal test  select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 38 / 88 Only for training and service purposes...
  • Page 56 1. Checking method for remote controller for adjustment Version Press the IN-START with the remote controller for adjustment Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 39 / 88 Only for training and service purposes...
  • Page 57 LCD TV connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 40 / 88 Only for training and service purposes...
  • Page 58 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 © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only...
  • Page 59 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 © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 42 / 88 Only for training and service purposes...
  • Page 60 Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 43 / 88 Only for training and service purposes...
  • Page 61 Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 44 / 88 Only for training and service purposes...
  • Page 62 Appendix : Exchange LPB(LED driver) No Light Dim Light Dim Light Dim Light Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 45 / 88 Only for training and service purposes...
  • Page 63 Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 46 / 88 Only for training and service purposes...
  • Page 64 Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 47 / 88 Only for training and service purposes...
  • Page 65 Front LOGO LED control in the status of Power On Condition: Menu  Option  LG Logo Light  Duration(off, off after10min) LOGO LED Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 48 / 88 Only for training and service purposes...
  • Page 66 (Power Board ↔ Main Board) SMAW200-H24S Power on Inverter On/off 3.5V PWM Dim #1 3.5V PWM Dim #2 L/DIMO_VS L/DIM0_MOSI L/DIM0_SCLK Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 49 / 88 Only for training and service purposes...
  • Page 67 (Power Board ↔ Main Board) SMAW200-H24S Power on Inverter On/off 3.5V PWM Dim #1 3.5V PWM Dim #2 L/DIMO_VS L/DIM0_MOSI L/DIM0_SCLK Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 50 / 88 Only for training and service purposes...
  • Page 68 Entry method 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 51 / 88 Only for training and service purposes...

  • Page 69: Checking Method

    1. Press the MENU button on the remote controller 2. Select the SOUND function of the Menu 3. Change TV Sound Out to TV Speaker Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 52 / 88...
  • Page 70 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 © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only...
  • Page 71 When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only...

  • Page 72: Vcom Adjustment

    ■ Push the OK key to store the value. Then the message “Saving OK” is pop. ■ Press the exit key to finish V-COM adjustment. Copyright © 2013 LG Electronics. Inc. All rights reserved. LGE Internal Use Only 55 / 88...

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