LG 32LG70 Series, Service Manual

Page 1: ...LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LA86B MODEL 32LG70 32LG70 UA website http biz LGservice com Internal Use Only ...

Page 2: ...ics Inc All right reserved Only for training and service purposes LGE Internal Use Only CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 10 TROUBLE SHOOTING 16 BLOCK DIAGRAM 23 EXPLODED VIEW 27 SVC SHEET ...

Page 3: ...fe to operate without damage of electrical shock Leakage Current Cold 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 term...

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 repla...

Page 6: ...dity 0 85 1 Application Range This spec sheet is applied to the 26 32 LCD TV used LA86B chassis 2 Specification Each part is tested as below without special appointment 1 Temperature 20 5 C 2 Relative Humidity 65 10 3 Power Voltage Standard input voltage 100 240V 50 60Hz Standard Voltage of each products is marked by models 4 Specification and performance of each parts are followed each drawing an...

Page 7: ...85 Full white Warm 5 500 6 500 7 500 pattern 8 Color Distortion DG 10 0 9 Color Distortion DP 10 0 deg 10 Color S N AM FM 43 0 dB 11 Color Killer Sensitivity 80 dBm 6 Component Video Input Y PB PR No Specification Remark Resolution H freq kHz V freq Hz Pixel clock 1 720 480 15 73 60 13 5135 SDTV DVD 480I 2 720 480 15 73 59 94 13 5 SDTV DVD 480I 3 720 480 31 47 60 27 027 SDTV 480P 4 720 480 31 47 5...

Page 8: ... 156 56 25 36 00 VESA SVGA O 7 800 600 37 879 60 31 40 00 VESA SVGA O 8 800 600 48 077 72 18 50 00 VESA SVGA O 9 800 600 46 875 75 00 49 50 VESA SVGA O 10 1024 768 48 363 60 00 65 00 VESA XGA O 11 1024 768 56 476 70 06 75 00 VESA XGA O 12 1024 768 60 023 75 02 78 75 VESA XGA O 13 1280 768 47 776 59 870 79 5 CVT WXGA O 14 1280 768 60 289 74 893 102 25 CVT WXGA O 15 1360 768 47 712 60 015 85 50 VESA...

Page 9: ... 70 06 75 00 VESA XGA O 12 1024 768 60 023 75 02 78 75 VESA XGA O 13 1280 768 47 776 59 870 79 5 CVT WXGA O 14 1360 768 47 712 60 015 85 50 VESA WXGA O 15 1280 1024 63 981 60 020 108 00 VESA SXGA O 16 1280 1024 79 976 75 025 135 VESA SXGA O 17 1600 1200 75 00 60 00 162 VESA UXGA O 18 1920 1080 67 5 60 148 5 HDTV 1080P O DTV 1 720 480 31 47 60 27 027 SDTV 480P 2 720 480 31 47 59 94 27 00 SDTV 480P ...

Page 10: ...1 Check the Component1 connection condition from the used device 2 Apply 480i Mode Horizontal 100 Color Bar Pattern to Comp1 port MSPG 925FA Model 209 Pattern 65 3 Set the input to Component1 and select Normal as video 4 Wait for one second or longer after receiving the signal press the ADJ key of the R C to enter into Ez Adjust select 3 ADC 480i Comp1 and press the Enter key to automatically adju...

Page 11: ... 8A 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 02 03 18 F1 47 84 05 03 02 20 22 10 23 15 07 50 10 67 03 0C 00 10 00 B8 2D 01 1D 00 72 51 D0 1E 20 20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C 30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A 40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A 50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18 60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00 70 00 1A...

Page 12: ...t wb 00 2f end In the case of Off set adjustment wb 00 ff End of white balance adjustment Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 12 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 01 01 01 10 00 11 01 03 18 73 41 96 0A CF 74 A3 57 4C B0 23 20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40 30 01 01 ...

Page 13: ...e menu and it is set to INNER as default If the adjustment cannot be done by the inner pattern select the HDMI to adjust Adjustment environment and reference 1 Environment illuminance Adjust it to 10 LUX or less at the place where the light source such as lamp should be blocked at maximum 2 Probe location Maintain the Color Analyzer CA 210 close to the module surface by 10cm or less and keep the p...

Page 14: ... voltage GND 1 5KV min at 100mA SIGNAL 3KV min at 100mA 2 TEST time 1 second 3 TEST POINT GND test between Power cord GND and Signal cable metal GND Resisting pressure test between Power cord GND and Live Neutral 4 LEAKAGE CURRENT Set to 0 5mArms 9 ISP Download option 9 1 Overview The Micom upgrade via the external port for the service for the customer 9 2 Device to use 1 PC 2 B D for the interfac...

Page 15: ...k the current version at Current TV Software Version Information check the S W version to upgrade at New Found TV Software Version Information and press the Enter button of the TV remote controller 4 Downloading is proceeded as shown at the below screen and when it is ended turning on off is automatically done When the automatic proceeding is not smoothly done manually perform the power On Off 5 W...

Page 16: ..._CLK_N HDMI_RX_0_CLK_P HDMI_RX_0_DATA0_N HDMI_RX_0_DATA0_P HDMI_RX_0_DATA1_N HDMI_RX_0_DATA1_P HDMI_RX_0_DATA2_N HDMI_RX_0_DATA2_P LVDS_TX_0_DATA_0_N LVDS_TX_0_DATA_0_P LVDS_TX_0_DATA_1_N LVDS_TX_0_DATA_1_P LVDS_TX_0_DATA_2_N LVDS_TX_0_DATA_2_P LVDS_TX_0_DATA_3_N LVDS_TX_0_DATA_3_P LVDS_TX_0_DATA_4_N LVDS_TX_0_DATA_4_P LVDS_TX_1_DATA_0_N LVDS_TX_1_DATA_0_P LVDS_TX_1_DATA_1_N LVDS_TX_1_DATA_1_P LVD...

Page 17: ...of LPF you should decide to replace item or not No Check the output Pin 1 of LPF IC808 Can you see the normal waveform Yes Yes After checking Power of LPF you should decide to replace item or not No This board has big problem because Main chip BCM355x have some troubles After checking thoroughly all path once again You should decide to replace BCM355x or not No 3 AV Check JK701 JK707 Can you see t...

Page 18: ... R758 because it s more easy to check Can you see the normal waveform JK705 may have problem Replace this Jack No This board has big problem because Main chip BCM355x have some troubles After checking thoroughly all path once again You should decide to replace BCM355x or not Yes Check DDC communication lines IC601 IC602 IC603 IC701 Yes Check the output of PI3HDMI341ATR IC600 Can you see the normal...

Page 19: ...E_IF_P PI3HDMI341ART HDMI HDMI_RX_0_CLK_N HDMI_RX_0_CLK_P HDMI_RX_0_DATA0_N HDMI_RX_0_DATA0_P HDMI_RX_0_DATA1_N HDMI_RX_0_DATA1_P HDMI_RX_0_DATA2_N HDMI_RX_0_DATA2_P CS5345 CQZR Audio SW MC33078 AMP CS5340 A D AV1 AV2 COMP1 COMP2 RGB I2S_CLK_IN I2S_DATA_IN I2S_LR_IN I2S_CLK_OUT I2S_DATA_OUT I2S_LR_OUT NTP3000 D AMP AUD_SPDIF buffer SPDIF out Coaxial out AUD_LEFT_P AUD_RIGHT_P MNT out TMDS141 HDMI4...

Page 20: ...K707 JK700 JK702 JK703 may have problem Replace this Jack No Check the Output Pin LOUT1 ROUT1 of CS5345 IC500 Can you see the normal waveform Yes After checking the Power of this chip you should decide to replace this or not No After checking audio signal line you should decide to replace item or not No Check the Output Pin OUTPUT1 OUTPUT2 of MC33078DR2G IC504 Can you see the normal waveform Yes C...

Page 21: ...or not No 5 Speaker Audio Out Check the input Pin 17 18 19 of NTP3000 IC501 Can you see the normal waveform Yes Check the speaker output wafer P501 Can you see the normal waveform After checking audio signal line you should decide to replace item or not No Check the output Pin AK25 AL25 AJ25 of BCM355x IC100 Measure waveform at R2635 R2636 R2637 because it s more easy to check Can you see the norm...

Page 22: ...les After checking thoroughly all path once again You should decide to replace BCM355x or not No After checking the Jack you should decide to replace item or not 7 MNT out Audio Out Check the input of JK704 Can you see the normal waveform Yes After checking audio signal line you should decide to replace item or not No Check the output Pin AN28 AP29 of BCM355x IC100 Measure waveform at R685 R686 be...

Page 23: ...Dual LVDS Connector FHD Full HD 1080P RS 232C Dead IC when Standby Alive IC when Standby Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP BCM3552 HD BCM3553 FHD MCLK MCLK HDMI CEC HDMI CEC To Micom To Micom SDA SCL SIF IF AT Buffer Digital out Single LVDS Connector HD Digital out WXGA 768P IR Local KEY Buffer Buffer 24C16 AGC CTL From BCM USB2 0 I2S Audio Input VSB QAM NTSC SIF AV1 AV2 C...

Page 24: ...y BCM3552 BCM3553 I2C Master I2C_CH0 5 0V I2C_CH1 5 0V I2C_CH2 3 3V Live Dead CH0 CH1 CH2 I2C_CH3 3 3V CH3 TU1 AT NT Tuner TDVF H051F 0xC2 IC403 NVRAM 24LC512 0xA6 IC501 DASP NTP3000 0X54 IC407 MICOM MTV416GMF 0x50 IC102 EEPROM CAT24C08 0xA0 IC500 AUDIO S W TEA6420D 0x9A IR ass y R 0x20 D eye G 0x70 LG50_only B 0x90 ...

Page 25: ...2MUV IC803 BD9132MUV IC802 AZ1117H 3 3 IC802 AZ1117H 3 3 3 3V 3 3V 3 3V_TMDS_SW 3 3V_TMDS_SW IC807 AZ1117H 1 8 IC807 AZ1117H 1 8 1 8V_NTP 1 8V_NTP IC501 NTP3000 IC501 NTP3000 D1 2V_BCM D1 2V_BCM IC809 SC156515M 1 8TR IC809 SC156515M 1 8TR D3 3V_BCM D3 3V_BCM IC810 SC156515M 2 5TRT IC810 SC156515M 2 5TRT D2 6V_BCM D2 6V_BCM IC101 S29GL128N IC101 S29GL128N IC401 74VC14APW IC401 74VC14APW IC300 3 HY5...

Page 26: ... NTP3000 IC811 KA7809ERTM IC811 KA7809ERTM IC812 KIA78R05F IC812 KIA78R05F 5 0V 5 0V Q901 SI4925BDY Q901 SI4925BDY Module T con Module T con IC102 CAT24C08WI IC102 CAT24C08WI IC201 TPS2052BDRG4 IC201 TPS2052BDRG4 IC502 CS5340 IC502 CS5340 IC601 2 AT24C02BN IC601 2 AT24C02BN IC701 AT24C02BN IC701 AT24C02BN IC702 AT24C02BN IC702 AT24C02BN IC808 AT24C02BN IC808 AT24C02BN ...

Page 27: ...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 28: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 29: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 30: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 31: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 32: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 33: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 34: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 35: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 36: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 37: ...May 2008 Printed in Korea P NO MFL42149302 ...