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LG 42PT250B Service Manual

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See also: Owner's Manual
PLASMA TV

SERVICE MANUAL

CHASSIS : PB12K
MODEL : 42PT250B
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67320203 (1110-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42PT250B-SG
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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  • Page 1: Service Manual

    Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com PLASMA TV SERVICE MANUAL CHASSIS : PB12K MODEL : 42PT250B 42PT250B-SG CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67320203 (1110-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    CONTENTS ..........................2 SAFETY PRECAUTIONS ......................3 SPECIFICATION.........................4 ADJUSTMENT INSTRUCTION ....................6 BLOCK DIAGRAM ........................13 EXPLODED VIEW ........................14 SCHEMATIC CIRCUIT DIAGRAM ..................... Copyright ©2011 LG Electronics Inc. All rights 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 ©2011 LG Electronics Inc. All rights reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    (2) Demanded other specification Safety : CE, IEC specification Model Name Market Appliance 42PT250B-SG Brazil Safety : IEC / EN60065 Copyright ©2011 LG Electronics Inc. All rights reserved. - 4 - LGE Internal Use Only Only for training and service purposes...

  • Page 5: General Specification

    2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : 0 ~ 90 % Copyright ©2011 LG Electronics Inc. All rights reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Adjustment Instruction

    (2) Color Temperature (White Balance) Adjustment xb 00 90: Endo of Adjustmennt (3) Make sure RS-232C control (4) Selection Factory output option Copyright ©2011 LG Electronics Inc. All rights reserved. - 6 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Auto Download

    If you success RGB 1080p Adjust. You can see “ADC RGB-DTV Success” It only needs to PCM EDID D/L for North America Product. (PU11A) Copyright ©2011 LG Electronics Inc. All rights reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 C2 Copyright ©2011 LG Electronics Inc. All rights reserved. - 8 -...

  • Page 9: White Balance

    – It is availed communicate with RS-232C : Baud rate: 115200) 3) Video Signal Generator MSPG-925F 720p, 216Gray (Model: 217, Pattern 78) Copyright ©2011 LG Electronics Inc. All rights reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 Pattern brightness - 100IRE(255Gray) - Picture: Vivid(Medium ) Brightness - 85IRE(216Gray) 100% uniformity Window White Pattern - Picture: Vivid(Medium) Copyright ©2011 LG Electronics Inc. All rights reserved. - 10 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: Adjustment Method

    - ESD test: Test between Power cord GND and Live and neutral. R Cut (4) Leakage current: Set to 0.5mA(rms) G Cut B Cut Copyright ©2011 LG Electronics Inc. All rights reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 After download is finished, remove the USB stick. Press “IN-START” key of ADJ remote control, check the S/W version. Copyright ©2011 LG Electronics Inc. All rights reserved. - 12 - LGE Internal Use Only Only for training and service purposes...

  • Page 13: Block Diagram

    BLOCK DIAGRAM Copyright ©2011 LG Electronics Inc. All rights reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Exploded View

    EXPLODED VIEW IMPORTANT SAFETY NOTICE 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.
  • Page 15 S7_TXD HDMI RS232C S7_RXD R295 0 PM_TXD 5V_HDMI_3 5V_HDMI_2 +3.3V_ST 5V_HDMI_1 +3.3V_ST C245 PM_RXD D203 0.1uF D202 R297 0 IC203 D201 JK203 5V_HDMI_1 5V_HDMI_2 5V_HDMI_3 R290 R291 R6003 MAX3232CDR HDMI_2 SIDE_HDMI R6004 R6005 5V_DET_HDMI_2 5V_HDMI_2 5V_HDMI_1 5V_DET_HDMI_1 1/16W 5V_DET_HDMI_3 1/16W 5V_HDMI_3 1/16W HDMI_1...
  • Page 16 Audio AMP +3.3V R353 READY R382 @compC READY R326 Q305 AMP_MUTE EAPD/OUT4B OUT3A/FFX3A READY 2SC3875S(ALY) READY R383 TWARN/OUT4A OUT3B/FFX3B C314 0.1uF VDD_DIG_1 CONFIG C319 0.1uF GND_DIG_1 AC_DET R384 PWRDN GND_REG R323 L300 C335 C339 R1300 10.0uH VDD_PLL OUT1A 0.22uF 1000pF R355 C317 C333...
  • Page 17 IC400 POWER VIDEO/AUDIO LGE2112-T8 IC400 LGE2112-T8 IC400 LGE2112-T8 PCMDATA[0]/GPIO126 AA18 PCMDATA[1]/GPIO127 AB22 PCMDATA[2]/GPIO128 AE20 CK+_HDMI1 RXACKP VIFP PCMDATA[3]/GPIO120 AA15 CK-_HDMI1 RXACKN VIFM AVDDLV_USB GND_32 PCMDATA[4]/GPIO119 AE21 D0+_HDMI1 1/16W RXA0P PCMDATA[5]/GPIO118 GND_33 AB21 AE18 AR401 D0-_HDMI1 RXA0N PCM_A[0-7] VDDC_1 GND_34 PCMDATA[6]/GPIO117 NF_CE1Z/GPIO138 AC17 D1+_HDMI1...
  • Page 18 IC501 NAND Flash DDR3 Memory H5TQ1G63DFR-H9C IC504 1GBit VCC_1.5V_DDR 1GBit x 2 H27U1G8F2BTR-BC +3.3V_AVDD +3.3V_AVDD A-TMA0 A-MVREFCA VREFCA R502 A-TMA1 NC_1 NC_29 A-TMA2 NC_2 NC_28 A-MVREFDQ A-TMA3 VREFDQ IC501-*1 H5TQ1G63DFR-H9C PCM_A[0-7] NC_3 NC_27 A-TMA4 R503 Hynix 2nd VREFCA A-TMA5 R505 NC_4 NC_26 VREFDQ...
  • Page 19 Power Wafer 3.3V_AVDD / 2.5AVDD 3.3Vst P600 SMAW200-H18S1 +2.5V_AVDD +3.3V_AVDD IC601 +5V_ST +3.3V_ST +3.3V P_17V TJ3940S-2.5V-3L +3.3V_TU +3.3V_DE IC602 AP2121N-3.3TRE1 L601 VOUT 120-ohm L600 R602 VOUT C612 120-ohm C609 C605 C606 0.1uF C602 Power Main ERROR_DET 10uF C615 C620 +3.3V_ST C607 0.1uF 10uF...
  • Page 20 +3.3V R2004 AV_CVBS2_DET R2005 +3.3V R2006 JK2001 COMP2_DET R2007 PPJ239-01 [RD1]E-LUG [RD1]O-SPRING_2 R2027 AV_RIN_COM2 C2009 R2020 R2034 470K 1000pF [RD1]CONTACT_2 [WH1]O-SPRING R2026 AV_LIN_COM2 C2003 R2032 R2017 1000pF [RD1]CONTACT_1 470K [RD1]O-SPRING_1 COMP2_Pr+ READY R2018 C2011 [RD1]E-LUG-S 10pF [BL1]O-SPRING COMP2_Pb+ READY C2006 10pF [BL1]E-LUG-S R2016...
  • Page 21 RF_SWITCH_CTL BRAZIL DEMODULATOR C2201 0.1uF +5V_TU BRAZIL TUNER R2140 +1.2V_DE FE_TS_VAL_ERR +3.3V_DE R2202 R2141 R2201 Q2201 FE_TS_SYN 2.2K R2142 MMBT3906(NXP) FE_TS_SERIAL C2132 R2143 0.1uF FE_TS_CLK R2203 C2202 0.01uF Q2202 TU2101 FE_BOOSTER_CTL 2SC3875S(ALY) TDTR-T036F +5V_TU Close to the tuner L700 RF_S/W_CTL C2000 C2108 C2110...
  • Page 23 LM1 Replace Training Manual LM1 Replace Training Manual Contents - Block Diagram - System Design - Trouble Shooting Guide Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 COMP 1,2 L/R Front RGB-PC L/R RS-232C UART UART UART TMDS/DDC HDMI 1 HDMI TMDS/DDC HDMI 2 TMDS/DDC HDMI 3 Side USB USB2.0 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Audio Amp. Active Low GPIO Reset H/W Reset S7LR Tuner Active Low Active High (Main Soc) GPIO Reset Demodulator Active Low Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 S7LR Power Sequence Power Up Sequence Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 XTAL stable to Reset falling ― ― Reset pulse width ― ― 1.26V to Reset falling ― ― 3.3VDDP to Reset falling ― ― Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 S7LR Power Sequence # t2 : Reset Pulse Width : 40ms Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 # t3 : Reset Pulse Width : 120ms # t4 : Reset Pulse Width : 400ms # t4 : Reset Pulse Width : 120ms Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 PM1_PM_UART_RX UART1_RX/GPIO50 (F20) <MOD_ROM_RX> +3.3V Module Module (F19) <MOD_ROM_TX> UART1_TX/GPIO51 I2S_IN_BCK/GPIO75 (F14) <SUB_SDA> +3.3V Sub(IR) Sub(IR) (F15) <SUB_SCL> I2S_IN_WS/GPIO74 Assy Assy Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Serial AP2121N Serial +1.5V_DDR_IN Stby: 0.017A IC400 IC400 22mA CEC FET IC203 IC203 +3.3V_ST Q203 MAX3232 MAX3232 +2.5V_AVDD +3.3V_AVDD Reset 1.8mA Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 Digital TV Audio Trouble Shooting Analog TV Audio Trouble Shooting Component / RGB / AV Audio Trouble Shooting HDMI Audio Trouble Shooting USB Trouble Shooting Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 Soc_Reset Signal from PM GPIO at IC103 problem Check signal transition Maybe NAND Flash Memory or IC104 S7LR have troubles Check DDR Memory /Replace one Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: No Osd Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 Electrical Specifications Power Supply Sequence Check CAS Input Signal Timing Specification Control Signal Register It should satisfy the Pixel Clock on CAS. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 DISPEN rising edge when Power On 1500 6000 msec Time interval between DISPEN falling edge d_off and 90% of Vs when Power Off Recommended 2sec Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 SDA (continue) Command Data Stop for Addr By Slave By Master By Slave Master : Image Board Slave : PDP Module Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Digital Tv Video Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 Replace X-TAL (X602) Check TP Clock, Data, Sync Maybe Demodulator has problems R630, R631, R632 , R633 Maybe MstarS7LR(IC101) has problems Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Analog Tv Video Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 Maybe Tuner(TU1300) has problems TU1300 #11 Pin Replace one of Check CVBS Signal R1330/Q1305/R154/C213 R1334 & Recheck Maybe Mstar S7LR(IC101) has problems Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Component Video Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 Check Component Signal R1074/R1073/R1076 R1074/R1073/R1076 R1001/R1004/R1067 R1001/R1004/R1067 & Recheck Check Component Signal Replace it R173/R175/R177 R180/R182/R184 Maybe Mstar S7LR(IC101) has problems Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Rgb Video Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 Replace one of R163/R164 Check Sync Signal & Recheck Replace it or re-burn Check EEPROM (IC901) & Recheck Maybe Mstar S7LR(IC101) has problems Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: Av Video Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 Check CVBS Signal R1003/R1044 R1003/R1044 & Recheck Replace one of Check CVBS Signal R187/R188/C226/C227 R187/R188/C226/C227 & Recheck Maybe Mstar S7LR(IC101) has problems Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 50: Hdmi Video Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 Check HDMI Jack Replace Jack JK801, JK803, JK804 Check I2C Signal Replace It & Recheck R829/R830 /R848/R849/R862/R863 Maybe Mstar S7LR(IC101) has problems Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 52: All Source Audio Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 Replace It & Recheck L511, L509 Check Mstar S7LR I2S Output Replace It & Recheck R711, R712, R713, R714 Maybe Mstar S7LR(IC101) has problems Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 54: Digital Tv Audio Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 Check video output trouble shooting Maybe Mster S7LR internal audio Follow procedure All source audio DSP has problems. trouble shooting Replace It Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 56: Analog Tv Audio Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Follow procedure All source audio problems. trouble shooting Replace It < SIF waveform – sample > - Defend on the input signal. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 58: Component / Rgb / Av Audio Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 C217/C218/C219/C204/R187/R188 C226/C227 C226/C227 & Recheck Maybe Mstar S7LR audio block has Follow procedure All source audio problems. trouble shooting Replace It Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 60: Hdmi Audio Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Re-download EDID data Replace IC801, IC802, IC804 Maybe Mstar S7LR audio block has Follow procedure All source audio problems. trouble shooting Replace it Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 62: Usb Trouble Shooting

    COMP1_LR COMP2_LR RGB_LR EXT_IN (Comp1/2, RGB) (USB) REAR HDMI_PORT HDMI 1 Side USB REAR HDMI_PORT HDMI 2 SIDE HDMI_PORT HDMI 3 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 - USB power could be disabled by inrushing current - In this case, remove the device and try to reboot the TV (AC power off/on) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

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