LG 32LH250H Service Manual Download Page 1

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LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : LA96C

MODEL : 32LH250H

32LH250H-UB

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 : MFL62195519 (1006-REV00)

Summary of Contents for 32LH250H

Page 1: ...EAD THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LA96C MODEL 32LH250H 32LH250H UB 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 MFL62195519 1006 REV00 ...

Page 2: ...yright LG Electronics Inc All right reserved Only for training and service purposes 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 16 BLOCK DIAGRAM 22 EXPLODED VIEW 24 SVC SHEET ...

Page 3: ...perate 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 terminals p...

Page 4: ...n 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 b...

Page 5: ...e 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 replaced...

Page 6: ...e 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 replaced...

Page 7: ...ceiver must be operated for about 20 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL CSA IEC specification EMC FCC ICE IEC specification SPECIFICATION NOTE Specifications and others are subject to change without notice for improvement 4 General Specification TV No Item Specification Remark 1 Receivable System 1 VSB 64...

Page 8: ...ock MHz Proposed PC 1 640 350 31 469 70 08 25 17 DOS 2 720 400 31 469 70 08 28 32 DOS O 3 640 480 31 469 59 94 25 17 VESA VGA O 4 800 600 37 879 60 31 40 00 VESA SVGA O 5 1024 768 48 363 60 00 65 00 VESA XGA O 7 1280 768 47 776 59 87 79 50 CVT WXGA O 8 1360 768 47 720 59 799 84 75 CVT WXGA O DDC No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed PC 1 640 480 31 469 59 94 25 17 VESA VGA O ...

Page 9: ...ttern 09ch there can some afterimage in the black level area 3 Method of PTC MICOM Download 3 1 Connection of MICOM JIG 1 Connect port 3 with Power Code 2 Connect jack 1 with PTC Micom 3 Connect USB Cable to the computer 4 Download Program execution SAP Configuration Notice Because PTC Download JIG has internal memory it can save download files using download program SAP Configuration Push the STA...

Page 10: ... USB in downloading 4 Main PCB check process APC After Manual Insult executing APC 4 1 Download 4 1 1 Boot file Download 1 Execute ISP program Mstar ISP Utility and then click Config tab 2 Set as below and then click Auto Detect and check OK message If display Error Check connect computer jig and set 3 Click Read tab and then load download file XXXX bin by clicking Read 4 Click Connect tab If disp...

Page 11: ...ch model has their number 4 Completed selecting Tool option 4 Board level adjustment 4 1 ADC adjustment 4 1 1 Overview ADC adjustment is needed to find the optimum black level and gain in Analog to Digital device and to compensate RGB deviation 4 1 2 Equipment Condition 1 Jig RS 232C protocol 2 Input MSPG 925FS Model 209 Pattern 65 Only component 3 RGB Adjust use internal pattern 4 1 3 Adjustment ...

Page 12: ...tment pattern PC Adjust by commanding AUTO_COLOR_ADJUST 5 1 2 Confirmation We confirm whether 0xAA RGB address of EEPROM 0xA2 is 0xAA or not If 0xAA RGB address of EEPROM 0xA2 isn t 0xAA we adjust once more We can confirm the ADC values from 0xA4 0XA9 RGB addresses in a page 0xA2 Manual ADC process using Service Remocon After enter Service Mode by pushing ADJ key execute ADC Adjust by pushing key ...

Page 13: ... RGB 5 3 Function Check 5 3 1 Check display and sound Check Input and Signal items cf work instructions 1 TV 2 AV CVBS S Video 3 COMPONENT 480i 4 RGB PC 1024 x 768 60hz 5 HDMI 6 PC Audio In and H P Out Display and Sound check is executed by Remote controller 5 4 EDID The Extended Display Identification Data DDC Display Data Channel download 5 4 1 Overview It is a VESA regulation A PC or a MNT will...

Page 14: ...AL FOS Data CS Checksum of sent Data A Acknowledge Ex Send JA_00_DD Ack A_00_okDDX Adj Map Applied model 14 LGE Internal Use Only Copyright LG Electronics Inc All right reserved Only for training and service purposes Color Analyzer Computer RS 232C Pattern Generator If TV internal pattern is used not needed Signal Source Probe RS 232C RS 232C START 6E A 50 A LEN A 03 A CMD A 00 A VAL A CS A STOP R...

Page 15: ...dj menu 7 White Balance you can select one of 3 options None Inner HDMI Default is inner By selecting HDMI you can adjust using HDMI signal Adj condition and cautionary items 1 Lighting condition in surrounding area Surrounding lighting should be lower than 10 lux Try to isolate adj area into dark surrounding 2 Probe location LCD Color Analyzer CA 210 probe should be within 10cm and perpendicular ...

Page 16: ...W on OK No OK Check Q706 Output 12V 5V Replace Power board Replace X100 OK Check Fuse OK No Check P701 PWR_ON 1pin 3 5V OK Re download software No OK Check Multi Voltage P701 7pin 12V 2pin 24V Replace Power board No Replace Mstar IC100 or Main board OK Replace Q706 No Check inverter control error P701 24pin Low P701 18pin high OK Check Power board or Module No Check Mstar LVDS output R812 R813 R82...

Page 17: ... IC1002 19 22 Check IC1002 No Check IF_P N Signal OK Replace Tuner No Replace X1005 No OK Check Mstar LVDS output R812 R813 R821 Check IC1004 LGDT Output AR1070 AR1071 OK Replace IC1004 No Replace Mstar IC100 or Main board No 3 Analog TV Video Check RF cable Check Tuner 5V Power IC1001 4pin OK Check CVBS signal TU1001 19 Pin Check IC1002 Check IC1005 19 22 No OK Bad Tuner No OK Check Mstar LVDS ou...

Page 18: ... OK Check Mstar LVDS output Replace Mstar IC100 or Main board No 5 RGB Video Check RGB Cable conductors for damage Check JK1204 OK OK Check input signal format Is it supported OK Check signal R G B H V Sync C113 C108 C114 R146 R149 Replace Jack No Check EDID OK Replace the defective IC or re download EDID data No Check other set If no problem check signal line No OK Check Mstar LVDS output Replace...

Page 19: ...in board No Check HDMI Cable conductors for damage of open conductor Check JK500 501 502 OK OK Check input signal format Is it supported OK Check EDID EEPROM IC500 501 502 I2C Signal 5 6 Replace Jack No Replace the defective IC or re download EDID data No Check HDCP key NVRAM IC105 power I2C Signal 5 6 Replace the defective IC No OK Check HDMI Signal Check other set If no problem check signal line...

Page 20: ... 3V 1 8V OK OK Make sure you can t hear any audio OK Check Mstar AUDIO_MASTER_CLK OK Check Connector P600 Check Regulator IC601 IC704 No Check signal line Or replace IC100 No Replace Mstar IC100 or Main board No Check Output Signal P600 1 2 3 4 pin OK Replace NTP Audio AMP IC500 No Replace connector if found to be damaged No OK Check speaker resistance and connector damage Replace speaker No ...

Page 21: ...trouble shooting guide Replace Mstar IC100 or Main board No 9 Digital TV Audio Check Tuner 5V Power TU1001 4pin Check IC1002 Check IC1005 19 22 No OK Check IF_P N Signal Bad Tuner Replace Tuner Bad Tuner No No OK Check Demodulator Input Clock X1005 Replace X1005 No OK Check IC400 LGDT Output AR1070 AR1071 Replace IC400 No OK Check Output Signal P600 1 2 3 4 pin Replace NTP3100L Audio AMP IC500 No ...

Page 23: ... opt Data 0 7 IF SIF TU_CVBS Reset IF_AGC SDA SCL_5V JTAG CLK TDI TDO MS RST Addr 0 1 CS Audio L R Audio L R for RGB HDMI 2 Audio L R Out RX TX RX TX JACK PACK JACK PACK at REAR at REAR JACK PACK JACK PACK at SIDE at SIDE SCL SDA_3 3V TR Buffer VSB Demod X tal Reset Switch Reset IC 12MH z TS In 0 7 TS_clk SOP Val H P Amp EEPROM EEPROM EEPROM Data 16 31 DDR2 512Mbit Qimonda Hynix AV Component 1 Y P...

Page 24: ...04 540 805 590 800 400 A5 A10 LV1 A2 Many 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 or...

Page 25: ...UB_HSYNC 008 D29 12K R1304 470K R1297 75 R1241 100pF 50V C1251 12K R1207 12K R1210 AV_R_IN 008 R32 AV_L_IN 008 R32 100pF 50V C1250 470K R1208 470K R1206 10K R1205 10K R1211 AV_CVBS_IN 008 D26 47pF 50V C1252 75 1 R1215 BG2012B080TF L1218 BG2012B080TF L1217 3 3V 5V_GENERAL 10K R1248 KCN DS 1 0089 JK1204 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 AT24C02BN 10SU 1 8 IC1200 3 A2 2 A1 4 GND 1 A0 5 SDA 6 SCL...

Page 26: ...G121SN1D L4009 2010_PWR 1 10W 5 1K 5 R4009 MLB 201209 0120P N2 L4000 2010_PWR 10uF 10V C4010 2010_PWR 1K OPT R4036 2SC3875S ALY 2010_PWR Q4006 E B C THERMAL SC632ULTRT 2010_PWR IC4002 3 C1 2 C1 4 IN 1 GND 5 EN 6 OUT 7 C2 8 C2 9 EP GND 12V 3 6uH L4003 2010_PWR 5V_ST 2SC3875S ALY 2010_PWR Q4005 E B C 12V 100uF 16V 2010_PWR C4030 10K 1 R4050 12V 220uF 16V 2010_PWR C4036 5V_ST 15K 1 R4047 2010_PWR 100...

Page 27: ...50V C625 POWER_DET 68uF C602 68uF C628 AZ1117H 1 8TRE1 EH13A IC601 2 OUTPUT 3 INPUT 1 ADJ GND 0 1uF 16V C648 1 8V_AMP 3 3V 0 1uF 16V C647 GND 10uF 16V C600 10uF 16V C603 NTP 3100L EAN60664001 IC600 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 DVDD_PLL 14 TEST0 15 DVSS_2 16 DVDD 17 SDATA 18 WCK 19 BCK 20 SDA 21 SCL 22 MONITOR_0 23 MONI...

Page 28: ...LM18PG121SN1D L727 1uF 10V C737 0 1uF 16V C713 1 8V_DDR 3 3V_ST 0 1uF 50V C794 10K R706 3 3V_ST 10uF 6 3V C751 10uF C756 RT1P141C T112 Q701 1 2 3 33K OPT R708 POWER_ON_DELAY 008 V17 004 Q28 0 R745 0 R746 1 8W 24K R736 FM20020 24 P700 2009_PWR 19 NC 14 12V 9 5 2V 4 GND 18 24V 13 12V 8 5 2V 3 GND 17 24V 12 GND 7 5 2V 2 PWRON 16 GND 11 GND 6 GND 1 NC 20 INV ON 15 GND 10 5 2V 5 GND 21 A DIM 22 Err OUT...

Page 29: ...0 L1010 100 R1028 OPT FE_VMAIN 008 D24 0 R1021 0 1 u F 50V C1014 270 R1019 5V_TU 0 OPT R1018 270 R1020 5V_TU 0 01uF 25V C1008 10uF 10V C1011 22 R1023 22 R1022 0 R1027 0 R1026 27pF 50V OPT C1024 27pF 50V OPT C1025 100pF 50V C1017 100pF 50V C1015 L1012 L1001 82pF 50V C1004 500 L1005 500 L1003 500 L1007 500 L1008 220uF 16V C1013 0 OPT R1031 0 R1033 0 R1032 ISA1530AC1 Q1001 E B C ISA1530AC1 Q1000 E B ...

Page 30: ...7 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 A2 NC1 N2 A3 P2 A7 H8 VSSQ1 F7 LDQS A8 UDQS R2 A12 L8 CS E2 NC2 E7 VSSQ5 D8 VSSQ6 D2 VSSQ7 A7 VSSQ8 B8 VSSQ9 B2 VSSQ10 P9 VSS1 N1 VSS2 J3 VSS3 E3 VSS4 A3 VSS5 G9 VDDQ1 G7 VDDQ2 G3 VDDQ3 G1 VDDQ4 E9 VDDQ5 C9 VDDQ6 C7 VDDQ7 C3 VDDQ8...

Page 31: ...cept FHD R854 0 Except FHD R855 0 Except FHD R852 LVDS_TXA0 LVDS_TXA0 LVDS_TXA3 LVDS_TXA1 LVDS_SEL 008 AR30 007 Z21 LVDS_TXAC 0 R859 OPT 0 OPT R857 0 R860 OPT PWM_DIM 008 AF11 004 M20 007 Z21 OPC_OUT 004 M19 007 Z21 LVDS_TXA2 OPC_EN 008 AQ28 007 Z20 LVDS_TXA2 0 OPT R858 GND GND FI X30SSL HF Except FHD P800 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 LV...

Page 32: ...UTE 003 Z25 003 AC20 100 OPT R829 IR_mstar 008 K6 3 3V_ST 3 3V_ST 4 7K R831 4 7K R832 0 R801 0 R802 20pF C187 20pF C186 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 RX...

Page 33: ...B B_TERMINAL2 5 T_SPRING 4 R_SPRING 7AB_TERMINAL1 6A T_TERMINAL1 3 E_SPRING SAM2333 LD903 A2 RD C A1 GN 47pF 50V C2171 100 R2282 2SC3875S ALY Q1112 E B C 0 R2348 0 1uF 50V C2150 330 R2338 4 7K R2299 0 R2262 BLAN 100 R2357 SAM2333 LD904 OPT A2 RD C A1 GN SCK 009 AD27 5VST VCC1 1uF 50V C2168 0 R2315 4 7K R2354 BUFFERED_MPI_DIN 009 I14 014 S6 10K R2268 5VST GIL G 02P P1203 OPT 1 2 330 R2333 5VST 5VST...

Page 34: ... IO2_2 B14 IO2_3 C13 IO2_4 B13 IO2_5 A13 IO2_6 B12 IO2_7 A2 IO2_47 E12 IO2_9 E11 IO2_10 E9 IO2_11 D12 IO2_12 D11 IO2_13 B3 IO2_46 B11 IO2_15 A11 IO2_16 D10 IO2_19 A9 IO2_20 D9 IO2_22 C4 IO2_45 E10 IO2_24 B4 IO2_44 D8 IO2_26 E8 IO2_27 A8 IO2_28 D7 IO2_30 A4 IO2_43 B7 IO2_32 A6 IO2_33 E7 IO2_34 P12 IO4_41 CH_DATA 7 P11 IO4_35 CH_DATA 6 P10 IO4_33 CH_DATA 5 P9 IO4_28 CH DATA 4 P8 IO4_24 CH_DATA 3 P7 ...

Page 35: ...F C2229 RJP_CTRL2 009 N31 MJ 657PT 8 SD JK1100 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 100 R2465 0 0 1 u F C2225 12V BG2012B080TF L1100 KEY_CTL_0 009 AD29 100pF 50V C1101 0 1 u F C1103 100 R1116 BG2012B080TF L1104 4 7K R1110 100 R1115 0 R1104 0 1 u F C1105 12507WS 12L P1100 1 LED_B 2 LED_R 3 GND 4 KEY1 5 KEY2 6 5V_ST 7 GND 8 NC 9 IR 10 GND 11 NC 12 NC 13 GND 0 R1105 BG2012B080TF L1103 KEY_CTL_1 009 AD...

Page 36: ...8 VSS 9 C 10 B 11 A 12 X0 13 X1 14 X 15 Y 16 VDD 2SC3875S ALY Q902 E B C 10K R926 100 R939 0 R914 5V_ST_PTC 5V_ST_PTC 22K R922 PTC_DEBUG_TX 009 Q29 012 D9 2SC3875S ALY Q904 E B C MSTAR_RX 008 AB27 ST3232CDR IC902 3 C1 2 V 4 C2 1 C1 6 V 5 C2 7 T2OUT 8 R2IN 9 R2OUT 10 T2IN 11 T1IN 12 R1OUT 13 R1IN 14 T1OUT 15 GND 16 VCC PTC_RX_MSTAR_5V 012 D13 0 R910 OPT R925 0 R913 PTC_TX_MSTAR 008 AQ28 PTC_DEBUG_R...

Page 37: ...34 USB_DM 008 AR34 CB3216PA501E L1300 180 R2513 MIC2009YM6 TR IC1304 3 ENABLE 2 GND 4 FAULT 1 VIN 6 VOUT 5 ILIMIT 4 7K R2515 10uF 10V C2248 5V_EXT 10K R2518 0 1uF C2249 3 3V USB_CTL USB_OCD 47 R2514 5 6V D1305 ADMC5M03200L 5 6V D1304 ADMC5M03200L USB DOWN STREAM KJA UB 4 0004 P1207 1 2 3 4 5 47uF 10V C2252 47uF 10V C2251 SIGN799 13 14 USB JACK U S B 5 V O v e r C u r r e n t P r o t e c t i o n U ...

Page 38: ...atch 014 K8 b_com_PWCTRL 009 BA31 0 R2519 BEXT_5V DUM_MPI_DOUT 009 K11 BEXT_IR_MODEM 014 L15 BEXT_MPI_OUT 014 L17 BEXT_5V BEXT_MPI_DIN 014 L17 BEXT_Game_Control_Latch 014 L16 MJ 623PT 6 S SD JK1401 BLAN 1 2 3 4 5 6 7 22K R629 OPT 0 R1467 4 7K R1464 MLB 201209 0120P N2 L502 MLB 201209 0120P N2 L1401 0 R2529 0 R2530 4 7K R2533 10K R2535 0 OPT R2534 0 R2536 0 R2531 bLAN_CTRL_PTC_1 009 AA36 10K R2532 ...

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