LG 55LV3730 Page 82 Service Manual Download

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Checking order when there is no audio

①

②

③

①

Check the contact condition of 24V connector of Main Board

②

Measure the 24V 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.

Established
date

Standard Repair Process Detail Technical Manual

Revised
date

LCD TV

Error
symptom

Voltage and speaker checking method
when there is no audio

Content

C. Audio error_ No audio/Normal video

C-1-3

Only for training and service purposes

LGE Internal Use Only

Summary of Contents for 55LV3730

Page 1: ... READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LB12B MODEL 55LV3730 55LV3730 TD North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO MFL67007024 1104 REV00 ...

Page 2: ...e Only Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 7 EXPLODED VIEW 14 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ...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 exposed metallic part has a return path t...

Page 4: ...ation EMC CE IEC 4 Model General Specification No Item Specification Remarks 1 Market ASIA Oceania Africa DTV Analog Middle East PAL DVB Market DTV Region Australia New Zealand AU Singapore SG Indonesia ID Malaysia MY Vietnam VN South Africa ZA Iran IR 2 Broadcasting system 1 PAL B G Australia India only PAL 2 PAL D K 3 PAL I I 3 SECAM DK BG I 4 DVB T 3 Receiving system Analog Upper Heterodyne G D...

Page 5: ... HDTV 720p 8 1280x720 44 96 59 94 HDTV 720p 9 1280x720 45 00 60 00 HDTV 720p 10 1920x1080 31 25 50 00 HDTV 1080i 11 1920x1080 33 75 60 00 HDTV 1080i 12 1920x1080 33 72 59 94 HDTV 1080i 13 1920x1080 56 250 50 HDTV 1080p 14 1920x1080 67 5 60 HDTV 1080p No Specification Proposed Remarks Resolution H freq kHz V freq Hz Pixel Clock MHz 1 720 400 31 468 70 08 28 321 For only DOS mode 2 640 480 31 469 59...

Page 6: ...138 625 WUXGA HDCP FHD model 2 PC Mode 7 HDMI Input 1 DTV Mode No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remark 1 720 480 31 469 31 5 59 94 60 27 00 27 03 SDTV 480P 2 720 576 31 25 50 54 SDTV 576P 3 1280 720 37 500 50 74 25 HDTV 720P 4 1280 720 44 96 45 59 94 60 74 17 74 25 HDTV 720P 5 1920 1080 33 72 33 75 59 94 60 74 17 74 25 HDTV 1080I 6 1920 1080 28 125 50 00 74 25 HDTV 1080I...

Page 7: ...the black level area 3 Automatic Adjustment 3 1 ADC Adjustment 1 Overview ADC adjustment is needed to find the optimum black level and gain in Analog to Digital device and to compensate RGB deviation 2 Equipment Condition 1 Jig RS 232C protocol 2 MSPG 925 Series Pattern Generator MSPG 925FA pattern 65 Resolution 480i Comp1 1080P Comp1 1920 1080 RGB Pattern Horizontal 100 Color Bar Pattern Pattern ...

Page 8: ...ort 1 Equipment setting 1 Play the LAN Port Test PROGRAM 2 Input IP set up for an inspection to Test Program IP Number 12 12 2 2 2 LAN PORT inspection PING TEST 1 Play the LAN Port Test Program 2 Connect each other LAN Port Jack 3 Play Test F9 button and confirm OK Message 4 Remove LAN CABLE 3 5 Model name Serial number Download 1 Model name Serial number D L A Press Power on key of service remote...

Page 9: ...ADC 480i 1080p Comp1 1 Check connected condition of Component 1 cable to the equipment 2 Give a 480i 1080p Mode Horizontal 100 Color Bar Pattern to Component 1 MSPG 925FA Model 209 Pattern 65 480i MSPG 925FA Model 225 Pattern 65 1080p 3 Change input mode as Component1 and picture mode as Standard 4 Press the In start Key on the ADJ remote control after at least 1 min of signal reception Then selec...

Page 10: ... Matrix should be calibrated using CS 1000 4 3 3 Equipment connection MAP 4 3 4 Adj Command Protocol Command Format LEN Number of Data Byte to be sent CMD Command VAL FOS Data value CS Checksum of sent data A Acknowledge Ex Send JA_00_DD Ack A_00_okDDX D sub to D sub DVI D to HDMI or HDMI to HDMI For HDMI EDID For Analog EDID 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01...

Page 11: ... one of 2 Test pattern ON OFF Default is inner ON By selecting OFF you can adjust using RF signal in 216 Gray pattern A Adj condition and cautionary items 1 Lighting condition in surrounding area Surrounding lighting should be lower 10 lux Try to isolate adj area into dark surrounding 2 Probe location Color Analyzer CA 210 probe should be within 10 cm and perpendicular of the module surface 80 100...

Page 12: ... Local Dimming Function Check Step 1 Turn on TV Step 2 At the Local Dimming mode module Edge Backlight moving right to left Back light of IOP module moving Step 3 Confirm the Local Dimming mode Step 4 Press exit key 4 7 Magic Motion Remote control test Equipment RF Remote control for test IR KEY Code Remote control for test You must confirm the battery power of RF Remote control before test recomm...

Page 13: ...d lamp will lit up and the stopper will allow the pallet to move on to next process 2 Checkpoint TEST voltage GND 1 5 KV min at 100 mA SIGNAL 3 KV min at 100 mA TEST time 1 second TEST POINT GND TEST POWER CORD GND SIGNAL CABLE METAL GND Internal Pressure TEST POWER CORD GND LIVE NEUTRAL LEAKAGE CURRENT At 0 5 mArms 5 Audio Measurement condition 1 RF input Mono 1 KHz sine wave signal 100 Modulatio...

Page 14: ...l and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IM...

Page 15: ...L1N AF27 TXOUT0_L1P AF28 TXOUT0_L2N AG27 TXOUT0_L2P AG28 TXCLK_LN AE26 TXCLK_LP AF26 TXOUT0_L3N AH27 TXOUT0_L3P AG26 TXOUT0_L4N AF25 TXOUT0_L4P AE25 TXOUT0_U0N AH26 TXOUT0_U0P AG25 TXOUT0_U1N AE24 TXOUT0_U1P AD24 TXOUT0_U2N AH25 TXOUT0_U2P AF24 TXCLK_UN AE23 TXCLK_UP AD23 TXOUT0_U3N AG24 TXOUT0_U3P AF23 TXOUT0_U4N AC22 TXOUT0_U4P AD22 TXOUT1_L0N AG23 TXOUT1_L0P AH23 TXOUT1_L1N AE22 TXOUT1_L1P AE21...

Page 16: ...ATD_7 GPIO L1 TSTRTD GPIO L3 TVLDD GPIO L2 MPEG_CLK GPIO P4 MPEG_D_0 GPIO T2 MPEG_D_1 GPIO R3 MPEG_D_2 GPIO R2 MPEG_D_3 GPIO P3 MPEG_D_4 GPIO P2 MPEG_D_5 GPIO P1 MPEG_D_6 GPIO R6 MPEG_D_7 GPIO N5 MPEG_SYNC GPIO T4 MPEG_DATA_EN GPIO P5 MCIF_RESET GPIO R4 MCIF_SCLK GPIO U1 MCIF_SCTL GPIO T3 MCIF_SDI GPIO T1 MCIF_SDO GPIO T5 VI_IFP0 C17 VI_IFM0 B17 VDDR_AGC D15 AGC_SDM_2 B16 AGC_SDM_1 A16 GPIO_0 A15 ...

Page 17: ..._INCM_SIF1_1 D19 VI_SIF1_2 E10 VI_INCM_SIF1_2 F11 LGE35230 BCM35230KFSBG IC101 NON_BCM_CAP SPDIF_INC_P B15 SPDIF_INC_N C15 SPDIF_IND_P C14 SPDIF_IND_N B14 I2SSCK_IN GPIO G4 I2SWS_IN F4 I2SSD_IN GPIO G5 AADC_LINE_L1 C25 AADC_LINE_R1 B24 AADC_INCM1 A24 AADC_LINE_L2 E22 AADC_LINE_R2 E23 AADC_INCM2 D23 AADC_LINE_L3 C24 AADC_LINE_R3 C23 AADC_INCM3 B23 AADC_LINE_L4 E21 AADC_LINE_R4 D21 AADC_INCM4 D22 AA...

Page 18: ..._13 AA24 DDR_ADA_14 AD27 DDR_BAA_0 Y27 DDR_BAA_1 AB28 DDR_BAA_2 W24 DDR_RASA_N V24 DDR_CASA_N W25 DDR_WEA_N V26 DDR_CKEA U24 DDR_CKA01_P W27 DDR_CKA01_N W28 DDR_CKA23_P N28 DDR_CKA23_N N27 DDR_VREFA U23 DDR_RST_N AA23 DDR_ZQ W26 C421 2 2uF C403 2 2uF C407 2 2uF NFM18PS105R0J C410 6 3V OUT IN GND NFM18PS105R0J C432 6 3V OUT IN GND NFM18PS105R0J C433 6 3V OUT IN GND NFM18PS105R0J C402 6 3V OUT IN GN...

Page 19: ... 22 WIRELESS_DET NEC_ISP_Rx IC602 uPD78F0514 NEC_MICOM 1 P60 SCL0 2 P61 SDA0 3 P62 EXSCL0 4 P63 5 P33 TI51 TO51 INTP4 6 P75 7 P74 8 P73 KR3 9 P72 KR2 10 P71 KR1 11 P70 KR0 12 P32 INTP3 OCD1B 13 P31 INTP2 OCD1A 14 P30 INTP1 15 P17 TI50 TO50 16 P16 TOH1 INTP5 17 P15 TOH0 18 P14 RXD6 19 P13 TXD6 20 P12 SO10 21 P11 SL10 RXD0 22 P10 SCK10 TXD0 23 AVREF 24 AVSS 25 ANI7 P27 26 ANI6 P26 27 ANI5 P25 28 ANI...

Page 20: ...MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC SCL2_3 3V R1602 33 LPB_42 47 55 SDA2_3 3V R1601 33 LPB_42 47 55 L DIM0_MOSI L DIM0_SCLK L DIM0_VS P1601 12507WR 08L 1 2 3 4 5 6 7 8 9 50 BCM35230 16 L_DIMMING Local Dimming Block Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 21: ...K C1911 0 1uF 16V OPT R1969 10K CI CI_ADDR 9 C1915 0 1uF 16V OPT R1980 100 CI R1945 10K OPT R1966 10K CI R1985 10K CI R1936 0 OPT R1949 22 CI R1937 62 CI R1959 22 CI PCM_MCLKI PCM_TS_SYNC C1904 0 1uF CI CI_MIVAL_ERR CI_ADDR 13 CI_MISTRT R1947 22 CI PCM_ADDR 4 PCM_MDI 0 7 PCM_ADDR 9 3 3V_CI R1931 22 CI CI_ADDR 12 R1918 22 OPT R1903 22 CI PCM_MIVAL_ERR R1939 10K CI PCM_ADDR 12 PCM_ADDR 12 IC1903 74L...

Page 22: ...B 12V_LNB A_GND A_GND A_GND C2311 10uF 25V LNB R2301 33 LNB C2307 0 01uF 50V LNB SDA1_3 3V C2302 1uF 50V LNB LNB_INT R2304 4 7K LNB DCDC_GND A_GND C2306 22000pF LNB C2301 0 22uF 25V IC2301 A8290SETTR T LNB 1 BOOST 3 TCAP 7 TDI 9 VREG 10 SDA 11 ADD 12 SCL 13 NC_2 14 IRQ 15 NC_3 16 NC_4 17 NC_5 18 NC_6 19 BFC 20 NC_7 21 NC_8 22 BFO 23 NC_9 24 BFI 25 VIN 26 LX 27 GNDLX 28 LNB 5 TDO 8 GND 6 EXTM 4 NC_...

Page 23: ...SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC CHBO_TS_SYNC CHBO_TS_SERIAL CHB_RESET CHBO_TS_VAL_ERR CHBO_TS_CLK TS Output 50 28 BCM35230 NON CHB NON CHB Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 24: ... C3714 1uF HDMI_HPD_3 R3733 10 3 3V_HDMI D0 _HDMI3 CK _HDMI3 C3709 0 1uF C3708 0 1uF HDMI_RX1 D2 _HDMI3 DDC_SCL_3 D1 _HDMI2 HDMI_CLK D0 _HDMI3 SCL3_3 3V CK _HDMI2 DDC_SDA_3 D2 _HDMI1 D2 _HDMI2 DDC_SDA_2 SDA3_3 3V CK _HDMI2 5V_Normal HDMI_HPD_2 HDMI_RX0 5V_HDMI_2 C3713 1uF C3712 1uF CK _HDMI3 5V_HDMI_1 CK _HDMI1 C3705 10uF R3738 10 D0 _HDMI1 DDC_SCL_2 C3710 0 1uF R3729 0 CK _HDMI1 C3715 1uF 10V D1 ...

Page 25: ...UT 4 FIX_POLE Q3801 2SC3052 E B C L3803 BLM18PG121SN1D 5V_Normal L3804 BG2012B080TF R3826 4 7K D3802 5 6V ESD_COMMON AMOTECH DSUB_G D3804 30V 3 3V_Normal 3 3V_Normal JK3803 KJA PH 0 0177 3 DETECT 4 L 5 GND 1 R EDID_WP R3820 OPT R3804 470K C3808 47pF 50V SIDE_HP_MUTE P3801 SPG09 DB 010 1 RED 2 GREEN 3 BLUE 4 GND_1 5 DDC_GND 6 RED_GND 7 GREEN_GND 8 BLUE_GND 9 NC 10 SYNC_GND 11 GND_2 12 DDC_DATA 13 H...

Page 26: ...901 0 1uF 16V EPHY_TDP 3 3V_Normal EPHY_LINK C3902 0 1uF 16V EPHY_RDP 2 5V_BCM35230 EPHY_ACTIVITY JK3901 XRJV 01V D12 180 1 2 3 4 5 6 7 8 D1 D2 D3 D4 9 D3906 5 5V ADLC 5S 03 015 D3901 5 5V ADLC 5S 03 015 D3902 5 5V ADLC 5S 03 015 D3905 5 5V ADLC 5S 03 015 D3903 5 5V ADLC 5S 03 015 D3904 5 5V ADLC 5S 03 015 L3901 MLB 201209 0120P N2 R3901 240 R3902 240 Ethernet Block BCM35230 50 39 LV7 ETHERNET Cop...

Page 27: ... D4101 5 6V CDS3C05HDMI1 C4101 10uF 10V 3 3V_Normal R4101 4 7K OPT L4101 MLB 201209 0120P N2 120 ohm D4102 5 6V CDS3C05HDMI1 SIDE_USB_DM SIDE_USB_DP SIDE_USB_OCD1 5V_USB C4102 100uF 16V P4101 3AU04S 305 ZC LG 1 2 3 4 5 IC4101 AP2191DSG 3 IN_2 2 IN_1 4 EN 1 GND 5 FLG 6 OUT_1 7 OUT_2 8 NC C4103 0 1uF 16V D4103 RCLAMP0502BA OPT D4101 D4102 DUAL COMPONENT 1ST EAH42720601 2ND EAH60994401 USB LV7 EU USB...

Page 28: ...W R4206 33 FRC2 TXC3P C4202 1000pF 50V TXD3P TXDCLKN TXC1P TXACLKP TXC4N TXCCLKP TXB3N TXD4N TXA2N TXB0P TXD1P C4203 0 1uF 50V TXA0N 3D_SYNC_RF TXB2N TXC1N TXB4P 3 3V_Normal TXC0P TXA4N TXB4N TXC2P PANEL_VCC P4201 FI RE51S HF J R1500 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 P4202 FI RE41S HF J...

Page 29: ... 390pF 50V R4612 12 AMP_MUTE 0 1uF C4608 16V R4605 3 3K 0 1uF C4621 50V D4602 100V 1N4148W OPT L4602 BLM18PG121SN1D C4605 1000pF 50V C4626 22000pF 50V R4604 100 0 1uF C4614 16V C4627 1uF 25V SCL3_3 3V 24V_AMP 0 1uF C4638 50V C4629 390pF 50V AUD_LRCH R4601 10K C4628 1uF 25V SPK_L C4617 22000pF 50V AMP_RESET_N R4608 12 D4603 100V 1N4148W OPT 3 5V_ST 0 1uF C4636 50V 0 1uF C4613 16V C4606 10uF 10V OPT...

Page 30: ...1 12507WR 15L IR_15PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 15 D4703 5 6V CDS3C05HDMI1 S T_SCL R4701 10K 1 R4704 100 R4703 100 D4706 5 6V CDS3C05HDMI1 LED_R BUZZ KEY1 EEPROM_SCL 3 3V_Normal R4710 100 R4711 100 C4703 0 1uF IR R4722 47K COMMERCIAL R4716 47K COMMERCIAL R4718 0 OPT 3 5V_ST 3 5V_ST Q4701 2SC3052 COMMERCIAL E B C R4720 10K COMMERCIAL_EU Q4703 2SC3052 COMMERCIAL_EU E B C IR_OUT R4713 10K ...

Page 31: ...D FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC AV2_CVBS_DET 3D_GPIO_1 WIRELESS_DET DD_MREMOTE 3D_GPIO_0 3D_GPIO_2 M_REMOTE_RX WIFI_DP AV2_CVBS_IN RST_HUB SIDE_USB_CTL2 M_RFModule_RESET WIFI_DM M_REMOTE_TX SIDE_USB_OCD2 WIRELESS_PWR_EN 5V_HDMI_4 DC_MREMOTE 3D_SYNC L_VS BCM35230 LV7 EU 48 50 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purpos...

Page 32: ...10210 M3 1 GASKET_5 0T MDS62110210 M7 1 GASKET_5 0T MDS62110210 M6 1 GASKET_5 0T MDS62110210 M5 1 GASKET_5 0T MDS62110210 M8 1 GASKET_5 0T MDS62110210 M11 1 GASKET_5 0T MDS62110210 M10 1 GASKET_5 0T MDS62110210 M9 1 GASKET_5 0T MDS62110210 M12 1 GASKET_5 0T MDS62110206 M2 3 GASKET_6 5T MDS62110206 M4 3 GASKET_6 5T MDS62110206 M3 3 GASKET_6 5T MDS62110206 M8 3 GASKET_6 5T MDS62110206 M7 3 GASKET_6 ...

Page 33: ... 0 POWER_16_GND C591 0 1uF 16V C539 10uF 6 3V C594 22uF 10V 560pF C593 50V 10uF C590 10V L517 BLM18PG121SN1D L DIM0_VS L_VS R574 0 POWER_16_URSA_SCAN R573 0 POWER_16_BCM_SCAN R595 4 3K 1 R593 3 9K 1 R592 1K 1 R510 3 4 7K 1 PD_ 18 5V R510 4 5 6K 1 PD_ 20V R511 3 1 21K 1 PD_ 18 5V R511 4 1 3K 1 PD_ 20V R517 100K R516 100K PD_ 18 5_20_24V R512 2 7K 1 PD_ 12V R513 1 21K 1 PD_ 12V R510 8 2K 1 PD_24V R5...

Page 34: ...U_F NIM C9118 4700pF 50V CN Q9101 MMBT3906 NXP DVB_S E B C R9102 51 1 16W 5 DVB_S 5V_TU Q9102 MMBT3906 NXP BOOSTER E B C C9121 62pF 50V NON_DVB_S R9152 220 5V_TU AR9102 47 EU_F NIM LNB_TX C9117 10uF 16V CN R9183 0 DVB_S C9138 0 1uF 16V 1 25V_TU 3 3V_S2_TU 3 3V_TU C9104 100pF 50V DVB_S R9106 0 BOOSTER TU_TS_ERR R9133 100K C9115 10uF 16V CN R9147 0 SCART TU_TS_SYNC 2 5V_TU R9116 22 R9146 10K BOOSTER...

Page 35: ..._IN ZD4012 5 1V C4015 560pF 50V ZD4013 5 1V ZD4010 5 1V R4007 22 1 10W 5 AV1_CVBS_IN AV1_R_IN C4002 27pF 50V R4035 10 1 C4023 560pF 50V D4011 5 6V SC COMP2_L_IN C4013 560pF 50V 3 3V_Normal R4019 470K C4004 27pF 50V D4010 5 6V C4021 560pF 50V ZD4015 5 1V SC_DET COMP2_DET R4018 470K R4025 470K R4036 10 1 C4014 560pF 50V C4022 560pF 50V R4028 75 SC COMP2_R_IN SC_G COMP2_Y R4023 1K R4032 22 C4003 27pF...

Page 36: ......

Page 37: ... ALEF BCM Chassis LG Electronics LCD TV FEB 19th 2011 By M R VIJAYSHANKAR Model 32 37 42 47 55LV3730 TD Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 38: ...structure Edge LED Edge Type w Local Dimming Upper Metal Cover LED Array LED Array is on the side of Module Feature Types of LED Edge Model LV37 0 T Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 39: ...rocessor DDR Memory Flash Memory 2 3 4 Micom for Key IR sensing HDMI switch 3 1 Audio AMP 10W 10W LV37 0 T Soft touch IR To Speaker 1 2 3 4 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 40: ...2 2Gb Audio AMP LVDS HDMI1 HDMI2 HDMI3 Rear COMP RGB H V Ethernet CVBS H P L R Out UART SYSTEM EEPROM X 1 1Mb HDMI S W HDCP EEPROM M Remote Module I2C Sub Micom NEC I2C RF TUNER DVB T AUDIO 51P HDMI S W IC BCM35230 Block Diagram Side SIF CVBS A V2 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 41: ...COM RGB_DDC_SCL RGB_DDC_SDA RGB_DDC_SCL RGB_DDC_SDA PC_L_IN PC_R_IN SPDIF_OUT SPDIF R L CVBS AV DET AV2_R_IN AV2_L_IN AV2_CVBS_IN AV2_CVBS_DET COMP_Y COMP_PB COMP_PR COMP DET COMP1 AV2 BSC_S_SCL BSC_S_SDA R L CVBS AV DET AV1_R_IN AV1_L_IN AV1_CVBS_IN AV1_CVBS_DET AV1 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 42: ... 2 3 4 5 Main PSU cable Main Module LVDS cable 51PIN LED driver PSU 15pin IR Touch Cable W Tube Speaker Cable PCBs Cables 32LV3730 TD PSU 1 2 3 4 1 2 3 4 5 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 43: ... 2 3 4 5 Main PSU cable Main Module LVDS cable 51PIN LED driver PSU 15pin IR Touch Cable W Tube Speaker Cable PCBs Cables 37LV3730 TD PSU 1 2 3 4 1 2 3 4 5 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 44: ... 2 3 4 5 Main PSU cable Main Module LVDS cable 51PIN LED driver PSU 15pin IR Touch Cable W Tube Speaker Cable PCBs Cables 42LV3730 TD PSU 1 2 3 4 1 2 3 4 5 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 45: ...Main PSU cable Main Module LVDS cable 51PIN Main PSU Inverter 15pin IR Touch Cable W Tube Speaker Cable PCBs Cables 47LV3730 TD PSU 1 3 4 1 2 6 Module PSU 3 4 5 6 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 46: ...Main PSU cable Main Module LVDS cable 51 41 Main PSU Inverter 15pin IR Touch Cable W Tube Speaker Cable PCBs Cables 55LV3730 TD PSU 6 Module PSU 1 3 4 1 2 3 4 5 6 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 47: ...b PCB LV37 Series Soft Touch IR Key PCB To Main 1 SPK unit 3 Soft Touch IR PCB Connected by 15 Pin Cable Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 48: ...ontal bar residual image light spot external device color error P 5 6 B Power error No power P 6 7 Off when on off while viewing power auto on off P 7 8 C Audio error No audio Normal video P 8 9 Wrecked audio discontinuation noise P 9 10 D Function error No response in remote controller key error recording error memory error P 10 11 Copyright 2011 LG Electronics Inc All rights reserved Only for tr...

Page 49: ...put Normal voltage N Repair Power Board or parts End Always check record S W Version and White Balance value before replacing the Main Digital Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date P 1 LCD TV Error symptom A Video error No video Normal audio A 1 3 A 1 1 A 1 2 A 1 4 Copyright 2011 LG Electronics Inc All rights reserved...

Page 50: ...replace MAIN B D Y Replace Power Board and repair parts N End Established date Standard Repair Process Revised date LCD TV A Video error No video No audio A 1 5 Error symptom P 2 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 51: ...heck point 1 Digital signal disconnected 2 Analog video signal weak Y N Normal screen End Replace Main B D Connect external device RF signal N Y Normal screen Check and fix ANT signal Request to cable antenn a provider End A 2 2 Established date Standard Repair Process Revised date LCD TV A Video error Video error video lag stop Error symptom P 3 A 2 1 Copyright 2011 LG Electronics Inc All rights ...

Page 52: ...ck external device and cable Y External Device Cable normal RGB HDMI DVI error Check external device and cable Replace Main B D Replace Main B D Use Picture Test N N Established date Standard Repair Process Revised date LCD TV A Video error Color error A 4 1 A 3 1 N Y Color error End Replace module Error symptom Request repair for external device cable Color error N Y Replace Main B D Color error ...

Page 53: ...cal Horizontal bar residual image light spot Request repair for external device Established date Standard Repair Process Revised date LCD TV A Video error Vertical Horizontal bar residual image light spot external device color error A 4 1 Error symptom Use Picture Test Color error N N Replace Main B D Color error Y End Y Replace module P 5 1 Copyright 2011 LG Electronics Inc All rights reserved On...

Page 54: ...Input error 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 N Y Replace Main B D Screen normal Check screen condition by input External Input Component RGB HDMI DVI Request repair for external device Component error RGB error HDMI DVI Connect other external device and cable Check normal ...

Page 55: ...oltage Replace Main B D N Y OK Replace Main B D N Y Normal voltage Check ST BY 3 5V Check and fix outlet and power cord connected condition Replace Power B D N Y Normal voltage Replace Power B D Y B 1 1 B 1 2 B 1 3 B 1 3 B 1 4 For Pacific 2 operation display LED can be off even with ST BY output of 3 5V In this case replace the Digital B D instead of the Power Board Error symptom P 6 Copyright 201...

Page 56: ... Time Out CPU Abnormal On 15 Minute Reset Off mode If Power Off mode is not displayed Check Power B D voltage Y N Replace Main B D Normal voltage Replace Power B D Replace Power B D N Y Normal End Caution Check and fix exterior of Power B D Part Describe situation Not a problem If there is no signal it is the 15 min OFF function B 2 1 B 2 2 Error symptom P 7 Copyright 2011 LG Electronics Inc All r...

Page 57: ...eck Speaker disconnectio n N Y Replace Speaker Replace MAIN Board End Established date Standard Repair Process Revised date LCD TV C Audio error No audio Normal video C 1 1 C 1 3 Disconnection Error symptom Use Sound Test Menu Normal Sound Y N Check Input Signal P 8 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 58: ...ed 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 24V Replace Main B D In case of External Input signal error Ch...

Page 59: ...V and 5V N Replace Main B D Replace Touch PCB W Front Cabinet Y N Y Check Assemble State of Touch PCB Cable Check Cable Connection Touch PCB MB Assemble Correctly N Replace Touch PCB W Front Cabinet Check Touch Value and Threshold Y If Touch Touch PCB Touch Over 10 THR 6 of 7 default Correct Value Y Replace Touch PCB W Front Cabinet N Work correctly END D 1 2 P 10 D 1 1 D 1 1 D 1 3 D 1 4 Copyright...

Page 60: ... Version checking method A 2 2 10 A Video error_Color error Check Link Cable LVDS reconnection condition A 3 1 Use Picture Test Mode A 3 2 13 A Video error_Vertical Horizontal bar residual image light spot LCD TV connection diagram 09 A 4 1 Use Picture Test Mode A 4 2 Check Link Cable LVDS reconnection condition A 4 3 15 B Power error_No power Check front display LED B 1 1 16 Check power input vol...

Page 61: ...speaker checking method when there is no audio C 1 2 24 Use Sound Test Mode C 1 3 25 C Audio error_Wrecked audio discontinuation Voltage and speaker checking method in case of audio error C 2 1 29 D Function error_ No response in remote controller key error Check Cable Connection D 1 1 Check Assemble state of Touch PCB D 1 2 Check 3 5V and 5V of IR Terminal D 1 3 Check Touch Value and Threshold D ...

Page 63: ... Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom LED Driver B 24V measuring method Content A Video error_No video Normal audio A 1 2 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 64: ...output 5V 12V 24V in the Power Board Established date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Check LED Driver PCB supply voltage Content A Video error_No video Normal audio A 1 3 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 65: ...or Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD Established date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Check White Balance value Content A Video error_No video Normal audio A 1 4 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 66: ...ror symptom Power Board voltage measuring method Content A Video error_No video No audio A 1 5 Check each voltage output 3 5V 12V 24V supplied from Power Board to Main Board Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 67: ...ptom TUNER input signal strength checking method Content A Video error_Video error video lag stop A 2 1 Check MENU Æ SETUP Æ Support Æ Signal Test Check Signal Strength and Quality Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 68: ...al Manual Revised date LCD TV Error symptom LCD TV Version checking method Content A Video error_Video error video lag stop A 2 2 Press the Menu button on the remote controller Enter Auto Channel Press the number button 1 1 1 1 1 HOST menu is displayed on the screen Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 70: ...ture Test Mode Content A Video error_Color error A 3 2 Menu Support Picture Test Entry method 1 Press the Menu button on the remote controller 2 Enter into Support Picture Test 3 The TV Display Test Image Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 71: ...D TV connection diagram 09 Content A Video error _Vertical Horizontal bar residual image light spot A 4 1 As the part connecting to the external input check the screen condition by signal Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 72: ...deo error _Vertical Horizontal bar residual image light spot A 4 2 Test Image Menu Support Picture Test Entry method 1 Press the Menu button on the remote controller 2 Enter into Support Picture Test 3 The TV Display Test Image Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 74: ...e Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Check front display LED Content B Power error _No power B 1 1 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 75: ...ed 3 Check the ST BY DC 3 5V output voltage from the POWER BOARD Established date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Check power input voltage and ST BY 3 5V Content B Power error _No power B 1 2 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 76: ...AC DET AC DC3 5V voltage on POWER BOARD 4 Check the POWER ON High About DC 1 8V or above voltage with input from POWER BOARD Established date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Checking method when power is ON Content B Power error _ No power B 1 3 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Interna...

Page 77: ...method Content B Power error _ No power B 1 4 24V is provided from the Power Board and supplied to LED Driver PCB Check the PIN contact condition and connection Check each voltage output 5V 12V 24V in the Power Board Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 78: ...t item 3 Established date Standard Repair Process Detail Technical Manual Revised date B 2 1 LCD TV Error symptom POWER OFF MODE checking method Content B Power error _ Off when on off whiling viewing Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 79: ...air Process Detail Technical Manual Revised date LCD TV Error symptom POWER BOARD PIN voltage checking method Content B Power error _ Off when on off whiling viewing B 2 2 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 80: ...from Off to On Established date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Checking method in menu when there is no audio Content C Audio error_ No audio Normal video C 1 1 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 81: ...lished date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Use Sound Test Mode Content C Audio error_ No audio Normal video C 1 2 Menu Support Sound Test Sound Test Play the Music Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 82: ...e speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Established date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Voltage and speaker checking method when there is no audio Content C Audio error_ No audio Normal video C 1 3 Copyright 2011 LG Electronics Inc All rights reserved Only for training...

Page 83: ...er terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Established date Standard Repair Process Detail Technical Manual Revised date LCD TV Error symptom Voltage and speaker checking method in case of audio error Content C Audio error_ Wrecked audio discontinuation noise C 2 1 Copyright 2011 LG Electronics Inc All rights reserved Only for t...

Page 84: ...Connection Content D Function error_ No response in remote controller key error D 1 1 1 Check Connection state of Main Board 2 Check Connection state of Touch PCB 3 Check Cable and Connection State Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 85: ...uch PCB Content D Function error_ No response in remote controller key error D 1 2 1 Remove Cable of Touch BCB 2 Remove Touch PCB Cover carefully 3 Check Asseble state of Touch PCB 4 Keep the guide of right side Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 86: ...Check the DC 5V on the 3 5V_ST terminal Pin 6 2 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 3 Input voltage terminal 3 5V_ST Pin 6 4 Remote controller receiver terminal IR Pin 9 1 1 Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Intern...

Page 87: ...r key error D 1 4 1 Press the ADJ Button on the remote controller for adjustment 2 Check THR Value Default 6 7 7 7 6 7 7 7 THR range is 5 25 5 is most sensitivity 3 When touch the Touch PCB and Touch value must lager than 10 4 IF Touch value is less than 10 adjust THR Value Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

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