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LG 42LD550-UB Service Manual

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LCD TV
SERVICE MANUAL
CHASSIS : LA02B
MODEL : 42LD550
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL62863211 (1001-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42LD550-UB
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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Summary of Contents for LG 42LD550-UB

  • Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LCD TV SERVICE MANUAL CHASSIS : LA02B MODEL : 42LD550 42LD550-UB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL62863211 (1001-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    CONTENTS ....................2 SAFETY PRECAUTIONS ................. 3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION .............. 10 EXPLODED VIEW .................. 18 SVC. SHEET ....................Copyright LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...
  • Page 4 Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the Copyright LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    Temp : 0 ~ 40 deg Humidity : ~ 80 % Storage Environment Temp : -20 ~ 60 deg Humidity : -85 % Copyright LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 -0.015 0.273 +0.015 ±0.015 for Adjustment Medium Typ. 0.285 Typ. -0.015 0.293 +0.015 Warm Typ. 0.313 Typ. -0.015 0.329 +0.015 Copyright LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 47.776 59.87 79.50 CVT(WXGA) 1360*768 47.712 60.015 85.50 VESA(WXGA) 1280*1024 63.981 60.020 108.00 VESA(SXGA) 1920*1080 66.587 59.934 148.5 HDTV 1080P Copyright LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 HDTV 1080P 1920*1080 26.97 23.976 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P Copyright LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...

  • Page 10: Adjustment Instruction

    - ad 00 90 End adj. 3.3 Etc • Ship-out mode • Tool option menu • USB Download(S/W Update, Option, Service only) Copyright LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 4.2.2.3 Input the ESN Key • download Model sending Key file • input by 1 by SET so as not to be duplicated Copyright LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 Download is failure, NG is displayed. 5) If Download is failure, Re-try downloads. •Caution) When EDID Download, must remove RGB/HDMI Cable. Copyright LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 5.4 EDID DATA Copyright LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 Adj. menu 6.White Balance, you can select one of 2 Test-pattern: ON, OFF. Default is inner(ON). By selecting OFF, you can adjust using RF signal in 216 Gray pattern. Copyright LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 • After final inspection, Always turn on the Mechanical S/W. 5.4. HDCP (High-Bandwidth Digital Contents Protection) SETTING - HDCP setting is not necessary in This Chassis. Copyright LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 - Internal Pressure TEST = POWER CORD GND & LIVE & NEUTRAL Front Module Assembly N/A • LEAKAGE CURRENT: At 0.5mArms Factory incoming Final Assembly Ship-Out Copyright LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 1) Push "IN-START" key in service remote controller. 2) Select "Tool Option 1" and Push “OK” button. 3) Punch in the number. (Each model has their number.) Copyright LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...

  • Page 18: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 COMPONENT/AV REAR JACK JK100 PPJ237-01 D3.3V COMPONENT2 [RD1]E-LUG D3.3V R108 2.7K R113 [RD1]O-SPRING REAR_AV_DET R116 D104 C105 9:G3 R119 2.7K 100pF 5.6V [RD1]CONTACT COMP2_DET 9:G5 D113 C115 C104 1uF 5.6V 100pF REAR AV REAR_AV_R_IN [WH1]O-SPRING C109 D105 10:B5 100pF 5.6V [YL1]CONTACT C101 1uF REAR_AV_L_IN...
  • Page 20 HDMI SWITCH 1.8V POWER 1.8V FOR HDMI SW +1.8V_HDMI D1.8V Q200 AO3438 EBK60752601 C200 4.7uF R201 POWER_ON/OFF2_1 R200 120K Seperated from Common sheet83 N.America & Korea only use 1.8V control SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS GP2_BCM_ATSC 09/10/xx...
  • Page 21 EARPHONE BLOCK USB BLOCK +3.3V_NORMAL USB2 +3.3V_NORMAL EARPHONE AMP L302 10uH IC301 +5V_USB AP2191SG-13 L301 R320 8 NC 4.7K MLB-201209-0120P-N2 C315 C317 IN_1 7 OUT_2 10uF 0.1uF IN_2 6 OUT_1 120-ohm L304 USB(DVR Ready) R308 BG2012B080TF C311 C313 5 FLG HP_L_OUT 10uF C310...
  • Page 22 SMD GASKET FOR EMI (8*6*5.5 FOR LE5400/5500/7500) SMD GASKET FOR EMI (8*6*12.5T) GASKET on the Bottom GASKET_12.5T SMD GASKET FOR EMI (8*6*7.5 FOR LE8500) SMD GASKET FOR EMI (8*6* 9.5T) GASKET on the Bottom GASKET_9.5T Draw bottom location when make a new pcb GAS11 GAS5 GAS5...
  • Page 23 BCM-DDR A1.2V * DDR2 1.8V By CAP - Place these Caps near Memory * DDR2 1.8V By CAP - Place these Caps near Memory IC900 LGE3549XQ (B2 VERSION) D1.8V D1.8V 0.1uF C656 DDR_BVDD0 0.1uF C657 DDR_BVDD1 DDR_BVSS0 DDR_BVSS1 DDR_PLL_TEST R616 DDR_PLL_LDO R618 DDR01_CKE...
  • Page 24 ATSC TUNER CHB OPTION +5V_TU R738 R739 CVBS_CHB_SEARCH 11:C4;AI6 Q703 ISA1530AC1 CHB OPTION +3.3V_TU +5V_TU R712 R713 R705 3.3K 3.3K SCL0_3.3V TU701 R731 R735 R706 TDTD-V055F SDA0_3.3V C710 C714 R726 47pF 47pF +1.8V_TU CVBS_CHB TU700 15:B5;AI7 R724 0 Q700 TDVJ-H031F TUNER_CHB_V ISA1530AC1 1.8V...
  • Page 25 SCL2_3.3V HIGH URSA3 Internal SDA2_3.3V HIGH HIGH URSA3 External SCL3_3.3V Wireless I2C connection with I2C_3 HIGH PWIZ Pannel T-con SDA3_3.3V with LG FRC Address : 0X20 R622 WIRELESS_SCL SCL3_3.3V WIRELESS 3:C5;87:U20 R623 SDA3_3.3V WIRELESS_SDA WIRELESS 3:C5;87:U20 SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
  • Page 26 BCM3549 LVDS/AUDIO IC900 LGE3549XQ (B2 VERSION) BCM LVDS Place close to BCM CHB Interface R1015 23:T19;76:T19;97:E18;97:I24;90:E7;94:E7 15:F7;15:I3 CHB_CLK_OUT PKT0_CLK LVDS_TX_0_DATA0_P LVDS_TX_1_DATA4_N R1007 15:F7;15:I3 CHB_DATA_OUT PKT0_DATA LVDS_TX_0_DATA0_N LVDS_TX_1_DATA4_P 23:T20;76:T19;97:D18;97:I24;90:E7;94:E7 R1008 EJTAG CHB_SOP_OUT LVDS_TX_1_DATA3_N D3.3V 15:F7;15:I3 PKT0_SYNC LVDS_TX_0_DATA1_P R1016 RMX0_CLK LVDS_TX_0_DATA1_N LVDS_TX_1_DATA3_P R1017 LVDS_TX_1_DATA2_N RMX0_DATA...
  • Page 27 BCM3549 VIDEO +5V_NORMAL IC900 R929 R921 R928 AUDIO OUT 7:T11 M_IF_AGC LGE3549XQ (B2 VERSION) C909 C912 0.01uF 0.1uF AC20 DS_AGCI_CTL I2S_CLK_IN AD20 R934 0.01uF C913 DS_AGCT_CTL I2S_CLK_OUT AUD_SCK 21:E18;21:E5;88:B3 I2S_SCLK_OUT 7:T10 M_IF_N 0.01uF AA19 C914 7:T10 M_IF_P EDSAFE_AVSS_1 I2S_DATA_IN AF21 R935 I2S_DATA_OUT EDSAFE_AVSS_2...
  • Page 28 BCM3549 POWER D1.2V IC900 IC900 LGE3549XQ (B2 VERSION) D1.2V C1053 C1058 C1062 C1068 C1075 C1081 C1087 C1090 C1096 LGE3549XQ (B2 VERSION) 0.1uF 4.7uF 1000pF 0.01uF 0.1uF 10uF 10uF 33uF 33uF DVSS_1 DVSS_63 DVSS_2 DVSS_64 VDDC_1 DVSS_3 DVSS_65 VDDC_2 DVSS_4 DVSS_66 VDDC_3 DVSS_5 DVSS_67...
  • Page 29 Put near to IC1504 Put near to IC900 Channel Browser #ALL CHB OPTION# +1.8V_TU +1.8V_ADC AR1505 AR1506 L1509 E1;G2 VSB_SOP CHB_SOP_OUT 10:C1;I3 BLM18PG121SN1D E1;G2 VSB_CLK CHB_CLK_OUT 10:C1;I3 E1;G2 VSB_DATA CHB_DATA_OUT 10:C1;I3 E1;G2 VSB_VALID CHB_VALID 9:G5;I3 C1501 C1512 10uF 0.1uF +3.3V_ADC +3.3V_ADC +1.8V_CHB L1511...
  • Page 30 Motion Remote controller Motion Remocon Interface P2000 +3.3V_NORMAL 12507WR-08L +3.3V_NORMAL L2000 120-ohm BLM18PG121SN1D R2000 M_REMOTE_RX 9:F3;9:G4 R2001 M_REMOTE_TX 9:F3;9:G4 R2002 M_RFModule_RESET 9:F3;9:G4 R2003 9:F3;9:G3 R2004 9:F3;9:G3 M_REMOTE ALL M_REMOTE OPTION SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. GP2_BCM_ATSC 09/10/xx FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS...
  • Page 31 MINI-LVDS FROM URSA3 [LEFT FFC Connector to Module RIGHT Conn] [RIFHT FFC Connector to Module LEFT Conn] (60Pin Mini-LVDS) (60Pin Mini-LVDS) P7401 P7400 104060-6017 104060-6017 MINI_LVDS MINI_LVDS R7412 VGH_M Z_OUT MINI_LVDS GMA1 Z_OUT (+25V) GMA1 CLK1 GMA3 CLK1 GMA3 CLK2 GMA4 CLK2 GMA4...
  • Page 32 LVDS FROM BCM3549 [51Pin LVDS From BCM] PANEL_VCC L7600 CIC21J501NE TM480Hz P7600 TF05-51S TM480Hz C7600 C7601 C7602 10uF 1000pF 0.1uF TM480Hz TM480Hz LVDS_TX_1_DATA4_P LVDS_TX_1_DATA4_N LVDS_TX_1_DATA3_P LVDS_TX_1_DATA3_N LVDS_TX_1_CLK_P LVDS_TX_1_CLK_N LVDS_TX_1_DATA2_P LVDS_TX_1_DATA2_N LVDS_TX_1_DATA1_P LVDS_TX_1_DATA1_N LVDS_TX_1_DATA0_P LVDS_TX_1_DATA0_N BIT_SEL 10BIT OPEN R7608 8BIT LVDS_TX_0_DATA4_P LVDS_TX_0_DATA4_N LVDS_TX_0_DATA3_P LVDS_TX_0_DATA3_N...
  • Page 33 LVDS FROM URSA3 [LEFT FFC Connector to Module LEFT Conn] [RIFHT FFC Connector to Module RIGHT Conn] (51Pin LVDS) (41Pin LVDS) [51Pin LVDS Connector] (For FHD 120Hz) [41Pin LVDS Connector] PANEL_VCC (For FHD 120Hz) L7700 FRC_LVDS P7701 P7700 TF05-41S TF05-51S FRC_LVDS FRC_LVDS C7700...
  • Page 34 FROM LIPS & POWER B/D L_VS R_VS MO_SCLK +3.5V_ST RT1P141C-T112 M2_SCLK 15V-->3.6V +12V +3.5V_ST Q8002 MO_MOSI +5V_NORMAL 20V-->3.5V +3.5V_ST R8068 M2_MOSI 24V-->3.48V 100K R8004 12V-->3.58V 4.7K NORMAL_26~55 IC8007 ST_3.5V-->3.5V R8000 P8000 MAX 350mA NCP803SN293 FW20020-24S +24V +12V +5V_NORMAL RL_ON IC8003 Q8000 2SC3052 R8081...
  • Page 35 +3.5V_ST R8146 C8101 C8102 MICOM_DOWNLOAD 13pF 13pF X8100 10MHz R8138 R8139 X8101 32.768KHz R8175 +3.5V_ST 10Mhz Crystal 4.7M for Debugger SW8100 +3.5V_ST JTP-1127WEM P8100 +3.5V_ST 12505WS-12A00 C8108 0.1uF MICOM_RESET C8103 0.1uF NEC_ISP_Tx NEC_ISP_Rx R8186 1/16W OCD1A EDID_WP OCD1B Q8100 FLMD0 2SC3052 R8104 10K P60/SCL0...
  • Page 36 +3.5V_ST EYEQ R8225 IR & KEY D8204 NEC_EEPROM_SCL P8200 CDS3C05HDMI1 5.6V 12507WR-12L R8213 R8211 C8213 1000pF L8200 R8209 BLM18PG121SN1D EYEQ KEY1 R8226 L8201 R8210 D8201 BLM18PG121SN1D NEC_EEPROM_SDA 5.6V D8205 KEY2 C8214 AMOTECH CDS3C05HDMI1 1000pF C8206 C8207 5.6V 0.1uF 0.1uF D8200 5.6V AMOTECH +3.5V_ST...
  • Page 37 * HDMI CEC +3.3V_HDMI +3.3V_NORMAL JACK_GND D8302 D8308 KRC104S HDMI_HPD_4 KRC104S HDMI_HPD_1 L8300 5.5V 5.5V Q8307 Q8305 BLM18PG121SN1D R8321 R8311 5V_HPD4 SHIELD 5V_HPD1 4.7K 4.7K KRC104S KRC104S Q8306 Q8302 5V_HDMI_4 C8324 5V_HDMI_1 +3.5V_ST R8316 R8302 HP_DET 0.1uF HP_DET D8311 D8305 R8317 JP8306 R8307...
  • Page 38 RGB PC IC8401-*1 R1EX24002ASAS0A IC8400 +5V_NORMAL 74F08D +5V_NORMAL D8409 ENKMC2838-T112 C8401 0.1uF R8401 RGB_EDID_RENESAS RGB_HSYNC IC8401 RGB_VSYNC M24C02-RMN6T R8402 R8420 8 VCC R8422 7 WC EDID_WP R8416 6 SCL RGB_DDC_SCL 5 SDA R8415 RGB_DDC_SDA 0IMMR00014A RGB_EDID_ST R8406 D8410 CDS3C05HDMI1 5.6V +3.3V_NORMAL R8405 D8408...
  • Page 39 (New Item Developmen H:9.2mm) SIDE_AV R8503 SIDE_AV_CVBS C8503 +3.3V_NORMAL D8503 47pF 5.5V [YL]E-LUG R8502 2.7K R8504 [YL]O-SPRING SIDE_AV_DET [YL]CONTACT C8500 D8500 100pF 5.6V [WH]O-SPRING R8505 [RD]CONTACT SIDE_AV_L_IN R8500 C8504 D8501 [RD]O-SPRING 100pF 470K C8501 5.6V [RD]E-LUG PPJ235-01 R8506 SIDE_AV_R_IN JK8500 D8502 R8501 C8505...
  • Page 40 WIRELESS READY JK8700 KJA-PH-3-0168 Wireless power VCC[24V/20V/17V]_1 VCC[24V/20V/17V]_2 VCC[24V/20V/17V]_3 VCC[24V/20V/17V]_4 VCC[24V/20V/17V]_5 +24V VCC[24V/20V/17V]_6 DETECT +3.3V_NORMAL C8700 R8704 INTERRUPT 0.1uF C8701 2.2uF GND_1 R8714 RESET R8705 Q8701 R8713 GND_2 2.2K WIRELESS_DETECT AO3407A R8709 I2C_SCL WIRELESS_SCL R8702 I2C_SDA WIRELESS_PWR_EN 1/4W WIRELESS_SDA 3216 Q8700 GND_3 C8702...
  • Page 41 +24V +24V_AMP L8803 MLB-201209-0120P-N2 C8827 0.1uF +1.8V_AMP +3.3V_NORMAL CCFL = 20V IC8800 AP1117E18G-13 Edge_LED 32~47 Inch = 20V ADJ/GND Vd=1.4V 120 mA 55 Inch & IOP Module = 24V C8800 C8803 C8802 0.1uF 0.1uF 10uF +24V_AMP SPK_L+ D8800 1N4148W R8812 R8819 L8805 100V...
  • Page 42 +1.5V_MEMC D1.5V_DDR3 D1.5V_DDR3 DDR3 1.5V By CAP - Place these Caps near Memory L8900 C8902 C8904 10uF 0.1uF +3.3V_MEMC Close to DDR Power Pin +12V +3.3V_MEMC IC8903 AOZ1072AI L8905 3.6uH PGND LX_2 L8902 D1.5V_DDR3 CIC21J501NE D1.5V_DDR3 NR8040T3R6N LX_1 C8942 C8944 C8946 22uF 0.1uF...
  • Page 43 C9038 C9039 FRC OPTION 20pF 20pF X9000 HIGH MIRROR MINI_LVDS NON_GIP SCANNING NON_L.D. NON_MIRROR LVDS NON_SCANNING L.D. 12MHz Serial Flash R9029 LOCAL DIMMING +3.3V_MEMC +3.3V_MEMC R9017 R9023 R9037 IC9000-*1 FRC_CONF0 DPM_A W25X40BVSSIG MINI_LVDS R9018 R9024 DO[IO1] HOLD R9019 R9025 DI[IO0] IC9000 MX25L4005CM2I-12G R9020...
  • Page 44 D9103 [LEVEL Shift Block] MMSD4148T1G VDD_LCM [POWER Block] (+16V) VCC_LCM 100V (+3.3V) CHECK Value!! To reduce R9156 R9165 C9134 C9138 Audible noise 16.00V 150K R9108 0.1uF C9153 C9150 R9182 C9142 C9139 C9141 100uF 9.1K 47uF 1/8W C9135 C9102 R9109 D9100 R9168-*1 R9157 R9166...
  • Page 45 INDEX SHEET 001 COMOPNENT/AV REAR Must be SHEET 031 SHEET 073 BLANK NOT USE included SHEET 002 HDMI_POWER SHEET 074 URSA3 120HZ MINI-LVDS in any PCB SHEET 003 USB/EAR-PHONE SHEET 075 LG5111 120HZ MINI-LVDS LVDS WAFER SELECT SHEET 004 SIDE GENDER LINE SHEET 076 BCM 60HZ LVDS SHEET 005...
  • Page 47 IC8902 : 1.2V Replace FRC(IC9001)or Main Board Check Inverter Control Check Power Board or Module P8000 18 pin : High Change Module Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 Bad Tuner. Replace Tuner. TU700 17/18 Pin Replace Mstar(IC9001) or BCM( IC900) Check FRC and BCM LVDS Output or Main Board. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 49 Bad Tuner. Replace Tuner. TU700 11 Pin Replace Mstar(IC9001) or BCM( IC900) Check FRC and BCM LVDS Output or Main Board. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 Check COMP_DET Signal Replace R119 or R129 Replace Mstar(IC9001) or BCM( IC900) Check FRC and BCM LVDS Output or Main Board. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 R8408, R8409, R8410 Check DSUB_DET Replace R8425 Replace Mstar(IC9001) or BCM( IC900) Check FRC and BCM LVDS Output or Main Board. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 52 HDMI Switch (IC8300) If no problem, check signal line Replace Mstar(IC9001) or BCM( IC900) Check FRC and BCM LVDS Output or Main Board. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53 1, 2, 3, 4 pin. Replace connector Check Connector & P8800 if found to be damaged. Check speaker resistance Replace speaker. and connector damage. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 54 IC700 2 pin : 1.2V Check IF_P/N Signal Bad Tuner. Replace Tuner. TU700 17/18 Pin Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 IC700 2 pin : 1.2V Check CVBS Signal Bad Tuner. Replace Tuner. TU700 11 Pin Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 Check JK8401 & Signal Line Replace Jack Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 Check IC300 & HP_L/R_OUT Replace IC300 Check JK300 Replace Jack (JK300) & Signal Line Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 SIDE CVBS, L/R Side AV MICOM SCL, SDA_3.3V DP/DM/ +5V (uPD) USB1 DP/DM/ +5V USB2 54MHz(3 overtone) X-tal Wireless Ready Copyright ⓒ 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

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42ld550