LG 37LH50YD Service Manual Download Page 2

Page: 2 / 66

LGE Internal Use Only

- 2 -

CONTENTS

CONTENTS .............................................................................................. 2

PRODUCT SAFETY ..................................................................................3

SPECIFICATION ........................................................................................6

ADJUSTMENT INSTRUCTION .................................................................9

BLOCK DIAGRAM...................................................................................13

EXPLODED VIEW .................................................................................. 14

SVC. SHEET ...............................................................................................

Summary of Contents for 37LH50YD

Page 1: ...EAD THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LB91B MODEL 37LH50YD 37LH50YD AA North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only P NO MFL60020305 0903 REV00 Printed in Korea ...

Page 2: ...nly Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 BLOCK DIAGRAM 13 EXPLODED VIEW 14 SVC SHEET ...

Page 3: ...d 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...

Page 4: ... on your body by touching a known earth ground 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 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...

Page 5: ...the solder joints of the two original leads If they are 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 replac...

Page 6: ...erformance of each parts are followed each drawing and specification by part number in accordance with BOM 5 The receiver must be operated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety IEC EN60065 EMI EN55013 No Item Specification Remark 1 Screen Device 37 wide Color Display module LCD 2 Aspect Ratio 16 9 3...

Page 7: ...480 31 47 59 94 480p 4 720x480 31 50 60 00 480p 5 720x576 15 625 50 00 SDTV DVD 625 Line 6 720x576 31 25 50 00 HDTV 576p 7 1280x720 45 00 50 00 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 43 67 5 59 94 60 HDTV ...

Page 8: ...emark 1 720 400 31 468 70 08 28 321 HDCP 2 640 480 31 469 59 94 25 17 VESA HDCP 3 800 600 37 879 60 31 40 00 VESA HDCP 4 1024 768 48 363 60 00 65 00 VESA XGA HDCP 5 1280 768 47 78 59 87 79 5 WXGA HDCP 6 1360 768 47 72 59 8 84 75 WXGA HDCP 7 1280 1024 63 595 60 0 108 875 SXGA HDCP 8 1920 1080 67 5 60 148 5 WUXGA HDCP 2 PC Mode No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remark 1 720...

Page 9: ...ct and check OK message If Error is displayed Check connection between computer jig and set 3 Click Read tab and then load download file XXXX bin by clicking Read 4 Click Connect tab If Can t is displayed check connection between computer jig and set 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message USB DOWNLOAD epk file download 1 Put the USB Stick to the USB sock...

Page 10: ...t 1024 768 ad 00 10 Adjust 1024 768 RGB aa 00 90 End Adjust mode Required equipment factory Service Remote control 3 2 Function Check 1 Check display and sound Check Input and Signal items cf work instructions 1 TV 2 AV 1 2 3 COMPONENT 480i 4 RGB PC 1024 x 768 60hz 5 HDMI 6 PC Audio In Display and Sound check is executed by remote control 10 LGE Internal Use Only Copyright 2009 LG Electronics Inc ...

Page 11: ...le from factory JIG model Push The IN STOP KEY after completing the function inspection 4 2 DDC EDID Write RGB 128Byte Connect D sub Signal Cable to D sub Jack Write EDID Data to EEPROM 24C02 by using DDC2B protocol Check whether written EDID data is correct or not For SVC main Ass y EDID have to be downloaded to Insert Process in advance 4 3 DDC EDID Write HDMI 256Byte Connect HDMI Signal Cable t...

Page 12: ...F FF FF FF FF FF FF FF FF FF FF FF FF F0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF LGE Internal Use Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes 12 EZ ADJUST 0 Tool Option1 1 Tool Option2 2 Tool Option3 3 Tool Option4 4 Country Group 5 ADC Calibration 6 White Balance 7 Test Pattern 8 EDID D L 9 Sub B C HDMI1 NG HDMI2 NG HDMI3 NG RGB NG Star...

Page 13: ...SDA_3 3V CVBS LCD Module 120Hz MST7323 FRC IC DDR2 256M Qimonda Hynix LVDS Buffer CE6355 Intel Demod CVBS Y Pb Pr RGB H V EEPROM Compone nt 2 AV 1 AV 2 RGB Audio L R USB2 0 USB DP DM MIC2019 O C Protector 5V 5V Serial Flash 2Mbit Serial Flash 32Mbit SPI EEPROM 512K CM3212 Sensor SCL SDA_3 3V SCL SDA HDMI 1 TDA9996 4x1 HDMI Switch HDMI 2 HDMI 3 HDMI 4 5V_HDMI1 HPD1 DDC SCL SDA CLK DATA 5V_HDMI2 HPD...

Page 14: ...electrical 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 manufa...

Page 15: ...1 2 4 3 S6_Reset Q1002 2SC3052 12V_DIP_DET E B C R114 1K 12V_DIP_DET R142 0 R150 30K OPT 3 3V_ST 24V R131 10K R132 OPT POWER_DET 001 V19 001 AL11 12V R115 2 2K 12V_DIP_DET 5V_GENERAL R112 1K 12V_DIP_DET Q1001 2SC3052 12V_DIP_DET E B C R139 OPT PWM1 PWM2 PWM2 R175 100 R177 0 HDMI_EQ_SEL R178 100 C110 1uF OPT BIT_SEL 009 AH21 R182 100 R155 100 NTP_MUTE 007 X18 R117 2 2K R116 2 2K MODEL_OPT_1 001 Q19...

Page 16: ...F 50V DDC_SDA_4 DDC_SCL_4 C210 2 2uF 16V HPD1 R201 100 LGE3369A Saturn6 Non RM IC100 RXACKP F1 RXACKN F2 RXA0P G2 RXA0N G3 RXA1P H3 RXA1N G1 RXA2P H1 RXA2N H2 DDCD_A_DA A1 DDCD_A_CK B2 HOTPLUG_A A2 RXBCKP C3 RXBCKN B1 RXB0P C1 RXB0N C2 RXB1P D2 RXB1N D3 RXB2P E3 RXB2N D1 DDCD_B_DA E1 DDCD_B_CK F3 HOTPLUG_B E2 RXCCKP AE8 RXCCKN AD8 RXC0P AD9 RXC0N AF8 RXC1P AF9 RXC1N AE9 RXC2P AE10 RXC2N AD10 DDCD_...

Page 17: ...V_DDR R307 22 R301 1K 1 R312 56 R315 56 AR310 56 AR301 56 R347 4 7K OPT R325 56 R338 56 1 8V_DDR 1 8V_DDR R329 56 OPT IC301 1 HYB18TC512160B2F 2 5 Qimonda_512M_DDR J2 VREF J8 CK H2 VSSQ2 B7 UDQS N8 A4 P8 A8 L1 NC4 L2 BA0 R8 NC3 K7 RAS F8 VSSQ3 F3 LDM P3 A9 M3 A1 N3 A5 K8 CK R3 NC5 L3 BA1 J7 VSSDL L7 CAS F2 VSSQ4 B3 UDM M2 A10 AP K2 CKE R7 NC6 M7 A2 N7 A6 M8 A0 J1 VDDL K3 WE E8 LDQS P7 A11 K9 ODT A...

Page 18: ... C404 1000pF 50V R442 0 COMP2_R_IN 002 R16 D404 30V AMOTECH COMP2_Pr 004 U12 AV1_CVBS_IN R422 0 D403 5 6V AMOTECH D414 5 6V AMOTECH R418 1K R425 10K D406 30V AMOTECH C409 47pF 50V D409 5 6V AMOTECH D426 5 6V ADMC5M03200L_AMODIODE OPT JK405 KCN DS 1 0089 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DSUB_B 002 D19 DSUB_HSYNC 002 D18 D418 30V EDID_WP 001 AJ20 006 AK7 006 AN3 006 AN12 006 AN17 C412 18pF OPT...

Page 19: ...003 0 1uF 16V P5001 12507WS 12L 1 SCL 2 SDA 3 GND 4 KEY1 5 KEY2 6 5V_ST 7 GND 8 WARM_ST 9 IR 10 GND 11 3 3V 12 PWR_ON 13 GND R5002 100 L5002 BLM18PG121SN1D R5005 0 C5004 100pF 50V C5007 1000pF 50V KEY2 D5001 5 6V AMOTECH SDA_SUB AMP C5002 0 1uF C5005 0 1uF 16V R5003 4 7K C500 0 1uF 16V R508 10K R506 100 Q502 2SC3052 IR_OUT E B C R503 10K IR_OUT IR_OUT R505 47K IR_OUT R504 10K IR_OUT R501 22 IR_OUT...

Page 20: ..._3 16 VSADJ 17 Y4 18 Z4 19 VCC_3 20 Y3 21 Z3 22 GND_4 23 Y2 24 Z2 25 VCC_4 26 Y1 27 Z1 28 GND_5 29 SCL_SINK 30 SDA_SINK 31 HPD_SINK 32 S1 33 S2 34 EQ 35 HPD1 36 SDA1 37 SCL1 38 B11 39 A11 40 VCC_5 41 B12 42 A12 43 GND_6 44 B13 45 A13 46 VCC_6 47 B14 48 A14 49 VDD 50 HPD2 51 SDA2 52 SCL2 53 B21 54 A21 55 VCC_7 56 B22 57 A22 58 GND_7 59 B23 60 A23 61 VCC_8 62 B24 63 A24 64 HPD3 CK _HDMI3 D1 _HDMI1 D...

Page 21: ...06 100V 1N4148W OPT D707 100V 1N4148W OPT C704 10uF 6 3V C700 10uF 6 3V C760 10uF 6 3V L700 BLM18PG121SN1D L701 BLM18PG121SN1D AMP_VCC L703 CB3216PA501E 24V C725 68uF 35V R701 100 R702 100 R705 100 R725 12 R726 12 R714 12 R712 12 R727 12 R728 12 R713 12 R711 12 IC701 NTP 3100L EAN60664001 1 BST1A 2 VDR1A 3 RESET 4 AD 5 DVSS_1 6 VSS_IO 7 CLK_I 8 VDD_IO 9 DGND_PLL 10 AGND_PLL 11 LFM 12 AVDD_PLL 13 D...

Page 22: ...47 10nF 50V 3 3V_ST 12V GND PANEL_CTL 001 AK10 R831 75K 1 8W 1 Q804 2SC3052 E B C C838 0 01uF 25V 3 3V_MEMC Q805 2SC3052 E B C 5V_ST C837 OPT C854 22uF 16V L812 CIC21J501NE POWER_ON RL_ON 5V_USB_SIDE L814 BLM18AG121SN1D L802 BLM18AG121SN1D C890 22uF 16V 5V_TUNER C886 0 1uF 16V C872 0 1uF 16V C883 22uF 16V OPT 3216 C809 0 1uF 16V 3 3V L820 BLM18PG121SN1D 3 3V_AVDD C808 10uF 6 3V L821 BLM18PG121SN1D...

Page 23: ...SET X900 12MHz OPC_EN M_SPI_DO C921 0 1uF R934 1M C902 15pF C900 15pF R935 100 R939 100 R942 100 R945 100 R930 100 R946 100 R929 100 R938 100 R931 100 R943 100 R936 100 R928 100 R965 22 R966 22 R969 22 R974 22 Scanning R982 OPT R970 OPT R980 OPT R986 OPT R984 OPT R985 OPT R981 OPT R973 OPT R971 OPT R979 0 R983 OPT R975 0 Non_Scanning R955 OPT R987 OPT R988 OPT R989 OPT R972 510 OPC_EN_PULL_UP R978...

Page 24: ...09 R4 010 U11 A_URSA_MCLKE 010 U9 A_URSA_BA1 010 AA16 C1022 0 1uF B_URSA_CASZ AR1005 22 1 8V_FRC_DDR URSA_A 0 12 URSA_DQM1 009 W4 C1019 0 1uF A_URSA_CASZ 1 8V_FRC_DDR C1031 0 1uF AR1004 56 AR1010 22 B_URSA_RASZ 010 R17 AR1002 56 URSA_DQSB1 009 X4 B_URSA_BA0 R1071 1K 1 AR1003 56 C1038 0 1uF URSA_RASZ C1011 0 1uF C1035 0 1uF 1 8V_FRC_DDR C1029 0 1uF 1 8V_FRC_DDR AR1001 56 URSA_MCLK1 009 AA4 C1015 0 ...

Page 25: ... C1152 0 1uF 16V C1151 0 1uF 16V 1 8V_TUNER C1148 0 1uF 16V 3 3V_TUNER C1153 0 1uF 16V IC1105 AZ1117H 1 8TRE1 EH13A 2 OUTPUT 3 INPUT 1 ADJ GND IC1103 AZ1117H 3 3 2 OUTPUT 3 INPUT 1 ADJ GND C1155 22uF 16V GND C1147 0 1uF 16V C1154 22uF 16V L1112 BLM18AG121SN1D C1150 22uF 16V L1111 BLM18AG121SN1D 5V_TUNER C1149 0 1uF 16V IC1102 XC5000 1 VDDA_1 2 IN1 3 GND_1 4 IN2 5 GND_2 6 EXTCHOKE 7 GND_3 8 VDDA_2 ...

Page 26: ......

Page 27: ...ff when on off while viewing power auto on off 8 C Audio error No audio Normal video 9 Wrecked audio discontinuation noise 10 D Function error No response in remote controller key error recording error memory error 11 External device recognition error 12 E Noise Circuit noise mechanical noise 13 F Exterior error Exterior defect First of all Check whether there is SVC Bulletin in GCSC System for th...

Page 28: ...nd 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 Electronics 6 3 Standard Repair Process Revised date 2008 3 26 1 13 LCD TV Error symptom A Video error No video Normal audio First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS C...

Page 29: ... MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio Established date Electronics 6 3 Revised date 2008 3 26 2 13 LCD TV Error symptom Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 30: ...Normal Picture Y N Y Close Normal Picture Y Close Menu Setup Booster By using Digital signal level meter By using Diagnostics menu on OSD Menu Setup Diagnostic Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N N Normal Picture Y Close N Standard Repair Process Established date Electronics 6 3 Revised date 200...

Page 31: ...device Cable normal RGB HDMI DVI error Check external device and cable Replace Main B D Replace Main B D N N A Video error Color error N Y End Replace module Request repair for external device cable Replace T Con Board N Y Color error Other Module Color error Check Test pattern Standard Repair Process Established date Electronics 6 3 Revised date 2008 3 26 4 13 LCD TV Error symptom Copyright ⓒ 200...

Page 32: ... 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 operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc Replace Main B D Screen normal N Y Check S W Version Y N Che...

Page 33: ...mal voltage Replace Power B D Y Standard Repair Process Established date Electronics 6 3 Revised date 2008 3 26 6 13 LCD TV Error symptom 09 years new model apply mechanical power switch to reduce power consumption in stand by status If mechanical power switch off Doesn t turn on by remote control Doesn t appear LED light Please refer to the A21 Page Stand By Red Operating Blue Check Repair Mechan...

Page 34: ...ower 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 Recording POWEROFF_SWDOWN Power off by S W Downloa...

Page 35: ...d and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video Disconnection Established date Electronics 6 3 Revised date 2008 3 26 8 13 LCD TV Error symptom Standard Repair Process Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 36: ...ck 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 or 24V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D N End Established ...

Page 37: ... Normal Voltage Close N N Check 5v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem Check IR Output signal Normal Signal N Y Repair Replace IR B D N Replace Main B D Y Y N Check R C Operation Normal operating Y Check Repair Cable connection Connector solder Normal operating Close N Check Replace Assembly status Key PCB tool Check Key Output signal Y Normal operating ...

Page 38: ...cable RGB 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 Electronics 6 3 Revised date 2008 3 26 11 13 LCD TV Error symptom Standard Repair Process Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 39: ...models without any fix information provide the description OR 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 noise With Inverter Module Without Inverter Module Established date Electronics 6 3 ...

Page 40: ...oller Remote controller damage Stand dent Replace stand F Exterior defect Exterior defect Established date Electronics 6 3 Revised date 2008 3 26 13 13 LCD TV Error symptom Standard Repair Process Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 41: ...alog TV 5 AV Scart CVBS S Video 6 Component 7 RGB D SUB 8 HDMI 9 Audio Problem All Input 10 Digital TV 11 Analog TV 12 AV Component RGB HDMI PC HDMI DTV 13 AV Audio out No Audio Headphone SPDIF 14 USB Remocon Problem USB no connect Remocon 15 Intelligent Sensor Intelligent Sensor Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 42: ...26V Replace MAIN B D IC805 YES NO MAIN B D L809 1 8V Replace MAIN B D IC807 YES NO Check MAIN B D X100 Clock 12MHz Replace MAIN B D IC100 YES NO Replace MAIN B D IC102 NAND FLASH YES Replace MAIN B D IC103 Serial Flash NO Replace MAIN B D IC300 IC301 DDR2 Memory NO Replace MAIN B D IC100 NO Making Revision 2009 2 1 1 25 LCD TV Symptom Power Up Boot Fail Copyright ⓒ 2009 LG Electronics Inc All righ...

Page 43: ...AIN B D L810 12V Replace MAIN B D Q805 NO Replace Main Board YES P800 Pin 13 14 12V P800 Pin 17 18 24V Check LVDS Cable OK YES Replace LVDS Cable NO Making Revision 2009 2 1 LCD TV Symptom No OSD 2 25 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 44: ...AIN B D IC808 MAIN B D L1113 1 8V Replace MAIN B D IC1105 YES NO YES MAIN B D X1101 Clock NO Replace MAIN B D X1101 Making Revision 2009 2 1 LCD TV Symptom Digital TV Video Problem 3 25 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 45: ...5V YES MAIN B D L1112 3 3V NO Replace MAIN B D IC1103 YES NO Replace MAIN B D IC808 MAIN B D L1113 1 8V Replace MAIN B D IC1105 YES NO YES MAIN B D X1101 Clock NO Replace MAIN B D X1101 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 46: ...Check MAIN B D R420 Video Signal NO YES Check MAIN B D C217 Video Signal Replace MAIN B D C217 NO Replace MAIN B D IC 100 YES Making Revision 2009 2 1 LCD TV Symptom AV1 CVBS No Video Problem 5 25 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 47: ...Check MAIN B D R465 Video Signal NO YES Check MAIN B D C211 Video Signal Replace MAIN B D C211 NO Replace MAIN B D IC 100 YES Making Revision 2009 2 1 LCD TV Symptom AV2 CVBS No Video Problem 6 25 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 48: ...Signal NO YES Check MAIN B D C200 C203 Y C201 Pb C202 Pr Video Signal Replace MAIN B D C200 or C203 or C201 or C202 NO Replace MAIN B D IC 100 YES Making Revision 2009 2 1 7 25 LCD TV Symptom Component1 No Video No Color Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 49: ...Signal NO YES Check MAIN B D C214 C209 Y C215 Pb C216 Pr Video Signal Replace MAIN B D C214 or C209 or C215 or C216 NO Replace MAIN B D IC 100 YES Making Revision 2009 2 1 8 25 LCD TV Symptom Component2 No Video No Color Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 50: ...eo R2030 HSYNC R2031 VSYNC Replace MAIN B D C207 or R2030 or R2031 NO Replace MAIN B D IC 100 YES MAIN B D JK405 Pin 2 Video signal R446 has Vsync R447 has Hsync Making Revision 2009 2 1 9 25 LCD TV Symptom RGB No Video Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 51: ...17 GREEN C2018 BLUE Video Signal Replace MAIN B D C2016 or C2017 or C2018 NO Replace MAIN B D IC 100 YES MAIN B D JK405 Pin 3 BLUE Pin 2 GREEN Pin 1 RED Video signal Making Revision 2009 2 1 10 25 LCD TV Symptom RGB No Color Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 52: ...the ADJUST MENU EDID OK YES Download EDID Refer to Adjustment Spec NO NO Replace MAIN B D IC601 HDCP KEY Making Revision 2009 2 1 11 25 LCD TV Symptom HDMI 1 4 All No Video Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 53: ...N B D JACK Check JK600 HDMI1 JK601 HDMI2 JK602 HDMI3 JK603 HDMI4 YES Making Revision 2009 2 1 12 25 LCD TV Symptom HDMI1 or 2 or 3 or 4 No Video Problem Check MAIN B D IC600 YES Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 54: ...Replace Speaker Cable NO Replace MAIN B D IC807 NO YES MAIN B D L824 1 8V MAIN B D Check R701 R702 R705 Signal YES Replace MAIN B D IC100 NO Replace MAIN B D IC701 NO Making Revision 2009 2 1 13 25 LCD TV Symptom All Source no Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 55: ...K YES Replace MAIN B D IC 100 Making Revision 2009 2 1 14 25 LCD TV Symptom Digital TV No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 56: ... Video OK YES Check MAIN B D R2046 Signal SIF NO Replace MAIN B D IC100 YES Making Revision 2009 2 1 15 25 LCD TV Symptom Analog TV No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 57: ...nd signal YES NO Replace MAIN B D IC 100 AV1 Video OK YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES Making Revision 2009 2 1 16 25 LCD TV Symptom AV1 No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 58: ...und signal YES NO Replace MAIN B D IC 100 AV2 Video OK YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES Making Revision 2009 2 1 17 25 LCD TV Symptom AV2 No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 59: ...ignal YES NO Replace MAIN B D IC 100 Component Video OK YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES Making Revision 2009 2 1 18 25 LCD TV Symptom Component1 No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 60: ... signal YES NO Replace MAIN B D IC 100 Component Video OK YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES Making Revision 2009 2 1 19 25 LCD TV Symptom Component2 No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 61: ...nd signal YES NO Replace MAIN B D IC 100 RGB Video OK YES Check MAIN B D JK401 Replace MAIN B D JK401 NO YES Making Revision 2009 2 1 20 25 LCD TV Symptom RGB HDMI PC No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 62: ...D Refer to Adjustment Spec NO Check the HDMI Cable Replace MAIN B D IC100 YES Making Revision 2009 2 1 21 25 LCD TV Symptom HDMI DTV No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 63: ...ES Check MAIN B D JK403 Replace MAIN B D JK403 NO YES NO Check the Trouble Shooting Guide Related to Audio Problem NO Making Revision 2009 2 1 22 25 LCD TV Symptom SPDIF No Audio Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 64: ... YES Check MAIN B D R826 5V Replace MAIN B D IC808 YES NO Replace POWER B D YES YES Replace MAIN B D IC 100 Check MAIN B D JK406 OK YES NO Replace MAIN B D JK406 Making Revision 2009 2 1 23 25 LCD TV Symptom USB No Connect Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 65: ... D P5001 Wafer Connector YES NO Replace it YES Replace IR B D Making Revision 2009 2 1 24 25 LCD TV Symptom Remote Control Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 66: ... P5001 Wafer Connector YES YES NO Replace it Replace IR B D Making Revision 2009 2 1 25 25 LCD TV Symptom Intelligent Sensor Problem Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Search results

Summary of Contents for 37LH50YD

Reviews:

Related manuals for 37LH50YD

Brands by name

Popular brands

LG 37LH50YD, Service Manual

Search results

Summary of Contents for 37LH50YD

Reviews:

Related manuals for 37LH50YD

Brands by name

Popular brands