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LG 42LN541C Service Manual Download Page 21

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LGE Internal Use Only

Copyright  © 

 LG Electronics. Inc. All rights reserved.

Only for training and service purposes

EXPLODED VIEW

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 original design without permission of manufacturer.

IMPORTANT SAFETY NOTICE

A2

A10

900

200

400

540

521

530

500

910

120

300

510

123

122

Set + Stand

LV

1

Summary of Contents for 42LN541C

Page 1: ...ODEL 42LN541C 42LN541C UA CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ... LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 8 TROUBLE SHOOTING 14 BLOCK DIAGRAM 20 EXPLODED VIEW 21 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ...inals etc to be sure the set is safe 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 m...

Page 4: ...lectrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial 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...

Page 5: ...he 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 replace...

Page 6: ...perated 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 ICES IEC specification 4 General Specification No Item Specification Result Remark 1 Receiving System 1 ATSC NTSC M 64 QAM 256 QAM 2 Available Channel 1 VHF 02 13 2 UHF 14 69 3 DTV 02 69 4 CATV 01 135 5 CADTV 01 135 3 In...

Page 7: ...DTV DVD 480I 3 720 480 31 50 60 00 27 027 SDTV 480P 4 720 480 31 47 59 94 27 00 SDTV 480P 5 1280 720 45 00 60 00 74 25 HDTV 720P 6 1280 720 44 96 59 94 74 176 HDTV 720P 7 1920 1080 33 75 60 00 74 25 HDTV 1080I 8 1920 1080 33 72 59 94 74 176 HDTV 1080I 9 1920 1080 67 50 60 00 148 50 HDTV 1080P 10 1920 1080 67 432 59 94 148 352 HDTV 1080P 11 1920 1080 27 00 24 00 74 25 HDTV 1080P 12 1920 1080 26 97 ...

Page 8: ...med in Final Assembly if needed Both Board level and Final assembly adjustment items can be check using In Start Menu 1 Adjust Check 3 2 Final assembly adjustment 1 White Balance adjustment 2 RS 232C functionality check 3 Factory Option setting per destination 4 Shipment mode setting In Stop 5 GND and HI POT test 3 3 Appendix 1 Shipment conditions 2 Tool option menu 3 USB Download S W Update Optio...

Page 9: ... it means the panel is at its Full Dynamic Range Case Cool Mode To adjust the white balance without the saturation G gain should be adjust at least 172 and change the others R B Gain When R or B gain is over 255 G gain can be adjust below 172 Case Medium Warm Mode To adjust the white balance without the saturation Fix the one of R G B gain to 192 default data and decrease the others 3 Adj conditio...

Page 10: ...g POWER ON 2 Zero Calibrate the probe of Color Analyzer then place it on the center of LCD module within 10cm of the surface 3 Press ADJ key EZ adjust using adj R C 6 White Balance then press the cursor to the right KEY When KEY is pressed 204 Gray 80IRE internal pattern will be displayed 4 a Adjust modes Cool Fix the G gain at least 172 and change the others R B Gain If R or B gain is over 255 G ...

Page 11: ...LA6xxx LA7xxx LA8xxx Standard color coordinate and temperature using CA 210 CH 14 by aging time H R Time Min Cool Medium Warm x y x x y x 271 270 286 289 314 318 1 0 5 280 285 295 304 320 329 2 6 10 276 280 291 299 316 324 3 11 20 272 275 287 294 312 319 4 21 30 269 272 284 291 309 316 5 31 40 267 268 282 287 307 312 6 41 50 266 265 281 284 306 309 7 51 80 265 263 280 282 305 307 8 81 119 264 261 ...

Page 12: ...it Remark 1 Audio practical max Output L R Distortion 10 max Output 9 0 8 5 10 9 9 3 12 0 9 8 W Vrms 1 Measurement condition EQ AVL Clear Voice Off 2 Speaker 8Ω Impedance 3 32 37 42 47 55 INCH 2 Audio practical max Output L R Distortion 10 max Output 4 5 6 0 5 2 6 45 6 24 7 07 W Vrms 1 Measurement condition EQ AVL Clear Voice Off 2 Speaker 8Ω Impedance 3 26 INCH USB S W Download option Service onl...

Page 13: ... of the TV set 4 Connect RJ45 cable into the JIG 5 If shown OK it s normal NG it s defect 6 If defect check the connection once again as done above 7 If the signal power is no good check the connection of RF cable 8 External Speaker Out 1 Connect external speaker to speaker out port with phone jack on TV side as below 2 Check the Max speaker output is 1W or not Sine wave with 1KHz will be displaye...

Page 14: ...r IC101 or Main board Check Multi Voltage P401 9 10pin 24V 13 14 15pin 12V Replace Power Board Check DRV ON Control P401 2 pin High Check Power Board Check IC402 3 7 Output Voltage IC402 2 5V IC403 1 15V IC404 1 5V Q408 3 3V Replace IC402 IC403 IC404 Q408 Re download software Check stand by Voltage L402 L403 3 5V Replace L402 L403 Check LVDS Power Voltage Q406 12V Replace Q406 Check Mstar LVDS Out...

Page 15: ...pin 1 8V Check IF_P N Signal TU1002 10 11 Pin Replace IC1001 Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok ok ok ok No No No No Bad Tuner Replace Tuner 3 AV Video Check inputsignal format Is it supported Check AV Cable for damage for damage or open conductor Check JK701 CVBS Signal Line R246 ok ok ok No Replace Jack ok Check CVBS_DETSignal R705 Replace R705 No Check Mstar LVDS Outpu...

Page 16: ... or Main Board ok No 5 HDMI Video Check inputsignal format Is it supported Check HDMICable conductors for damage or open conductor Check EDID Downlaod ok ok ok No Replace the defective IC or re download EDID data Check HDMISignal Check other set If no problem check signal line ok No Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok No Replace Main Board No Check HDMI_DET HPD No Replace ...

Page 17: ...k AMP IC IC501 Power 24V 3 3V No Replace Amp IC IC501 Check Output Signal P501 1 2 3 4 pin No Check Mstar AUDIO_MASTER_CLK R148 No Replace Mstar IC101 or Main Board ok Check AMP I2C Line R503 R504 No Check signal line Or replace Mstar IC101 Replace Audio AMP IC IC501 Check signal line L505 L506 ok No 7 Digital Analog TV Audio Check RF Cable Signal Follow procedure 7 All source audio trouble shooti...

Page 18: ...uide ok ok Check Output Signal JK902 4 5 pin Replace Phone Jack JK902 ok No Check JK902 Replace Phone Jack if found to be damaged ok No Check External Speaker Replace External speaker ok No Check AMP IC IC901 Power 24V L902 No Replace L902 Check AMP IC IC1800 Output 2 12 14 24 Pin No replace AMP IC IC901 Check Mstar External AUDIO output R201 R202 No Replace Mstar IC101 or Main Board ok Check AMP ...

Page 19: ...45 Cable HDMI cable Check RJP Power 12V L901 JK901 1pin Replace L901 JK901 1pin Check RJP Control Signal for input mode R911 R909 R910 R912 R913 High level above 3V Replace R911 R909 R910 R912 R913 ok ok ok No No Check RJ45 Jack JK901 Replace connector if found to be damaged No ok Check RJP Replace RJP No 10 RJP only us model ...

Page 20: ...C 8MBIT MX25L8006EM2I 12G LVDS 80MHz 60Hz 120Hz HD FHD A AMP NTP7500 USB2 0 DP DM SPK L R X tal 24MHz 51P I2S RJP L R TMDS RGB H V RS232C Rear TMDS DDR2 Add DDR2 Data SPI AV Side NAND Flash 2GBIT HY27UF082G2B TPCB PCM_A 0 7 TMDS HDMI3 CVBS L R DDR3 2G Samsung K4B2G1646C HCK0 667MHz AT24C256C SSHL T 256KBIT I2C TI AMP External SPK Out I2S L R 30P IRout Path DDR3 1G Hynix H5TQ1G63EFR PBC 667MHz 148 ...

Page 21: ...ristics 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 IMPORTANT SAFETY NOTICE A2 A10 900 200 400 540 521 530 500 910 120 300 510 12...

Page 22: ...4 I O7 45 NC_26 46 NC_27 47 NC_28 48 NC_29 17 AL 3 NC_3 6 NC_6 16 CL 15 NC_10 14 NC_9 13 VSS_1 12 VDD_1 11 NC_8 10 NC_7 9 E 8 R 7 RB 4 NC_4 5 NC_5 25 NC_16 24 NC_15 23 NC_14 2 NC_2 22 NC_13 21 NC_12 1 NC_1 20 NC_11 19 WP 18 W PF_WP EXT_SPK_DET R140 1K C107 0 1uF HDCP_EEPROM AMP_RESET RJP_CTRL3 R104 10K OPT R109 3 9K OS IC101 7 LGE2111A VD VD CN _Multi GPIO36 C7 GPIO37 E6 GPIO38 F5 GPIO39 B6 GPIO40...

Page 23: ...AUL0 AB9 AUR0 AA11 AUL1 Y9 AUR1 AA9 AUL2 AA7 AUR2 AB8 AUL3 Y8 AUR3 Y10 AUL4 AC7 AUR4 AD7 AUOUTL0 W6 AUOUTL2 V6 AUOUTL3 V4 AUOUTR0 Y7 AUOUTR2 W5 AUOUTR3 U5 AUVRM AD5 AUVAG AE5 AUVRP AC6 EARPHONE_OUTL AA6 EARPHONE_OUTR AB6 ET_RXD 0 RP GPIO60 C6 ET_TXD 0 TP GPIO57 C5 ET_RXD 1 RN GPIO63 A6 ET_TXD 1 LED1 GPIO56 C4 ET_TX_CLK TN GPIO59 B5 ET_TX_EN GPIO58 C3 ET_MDC GPIO61 A3 ET_MDIO GPIO62 B3 ET_COL LED0 ...

Page 24: ...P OPT E B C SPI_SCK C301 0 1uF S_FLASH_OS SPI_SDI FLASH_WP IC301 MX25L8006EM2I 12G S_FLASH_OS_MACRONIX 3 WP 2 SO SIO1 4 GND 1 CS 5 SI SIO0 6 SCLK 7 HOLD 8 VCC SPI_SDO R303 33 S_FLASH_OS R302 4 7K OPT 3 5V_ST 3 5V_ST R301 10K OPT 3 5V_ST IC301 1 W25Q80BVSSIG S_FLASH_OS_WINBOND 3 WP IO2 2 DO IO1 4 GND 1 CS 5 DI IO0 6 CLK 7 HOLD IO3 8 VCC 3 Serial FLASH Serial Flash for SPI boot_NON_OS and OS LA2AW 2...

Page 25: ...0 FET_AOS R451 1 5 1K 1 PD_KR_42_LIPS L409 CIS21J121 120 L412 BLM18SG700TN1D R455 1 100 1 PD_KR_42_LIPS R441 1 4 7K PANEL_DISCHARGE_RES_4 7K R442 1 4 7K PANEL_DISCHARGE_RES_4 7K Q408 2 AO3435 FET_2 5V_AOS G D S Q408 1 DMP2130L FET_2 5V_DIODE G D S R459 1 2 2K FET_2 5V C444 1 2 2uF 10V FET_2 5V R441 5 6K PANEL_DISCHARGE_RES_5 6K R442 5 6K PANEL_DISCHARGE_RES_5 6K C448 22uF 10V R441 2 5 1K 5 1K_PANE...

Page 26: ... 22 PVDD2_1 23 PVDD2_2 24 PVDD2_3 25 OUT2A_1 26 OUT2A_2 27 PGND2A 28 BST2A 29 VDR2 30 AGND 31 VCC_5 32 VDR1 33 BST1B 34 PGND1B 35 OUT1B_1 36 OUT1B_2 37 PVDD1_1 38 PVDD1_2 39 PVDD1_3 40 OUT1A_1 41 OUT1A_2 42 PGND1A 43 BST1A 44 RESET 45 AD 46 GND_IO 47 CLK_I 48 VDD_IO 49 EP 0 1uF C514 16V R514 12 C509 33pF 50V Q501 MMBT3904 NXP NON_LIPS E B C R521 10K C510 10uF 10V R518 4 7K 24V_AMP SPK_L R515 12 0 ...

Page 27: ...UT R606 10K 1 3 5V_ST IR R607 10K IR_OUT_EU L603 BLM18PG121SN1D R602 100 3 5V_ST C607 100pF 50V C604 0 1uF L602 BLM18PG121SN1D 3 5V_ST C603 0 1uF C602 1000pF 50V R608 10K 1 C601 0 1uF 16V IR_OUT KEY1 3 5V_ST R611 3 3K R605 1K IR_OUT_EU LED_R R615 1 5K VA602 5 6V AMOTECH CO LTD OPT VA601 5 6V AMOTECH CO LTD OPT ZD603 5 48VTO5 76V OPT Q601 2SC3052 IR_OUT_EU E B C Q602 2SC3052 IR_OUT E B C R609 1K IR...

Page 28: ...0pF 50V OPT VA706 5 6V OPT R720 75 RGB_PC R724 2 2K RGB_PC C713 330pF 50V C707 0 1uF 16V D707 50V BAP70 02 3 5V_ST 5V_Normal IC701 MAX3232CDR EAN41348201 3 C1 2 V 4 C2 1 C1 6 V 5 C2 7 DOUT2 8 RIN2 9 ROUT2 10 DIN2 11 DIN1 12 ROUT1 13 RIN1 14 DOUT1 15 GND 16 VCC JK706 SPG09 DB 009 1 2 3 4 5 6 7 8 9 10 C704 0 1uF C712 330pF 50V L702 120 ohm IR_OUT D703 5 6V JK702 1 JST1223 001 SPDIF JACK SOLTEAM 1 GN...

Page 29: ... TMDS_DATA0 8 TMDS_DATA0_SHIELD 3 TMDS_DATA2 16 SDA 7 TMDS_DATA0 6 TMDS_DATA1 15 SCL R807 0 HDMI1_ARC HDMI_ARC JK801 1 YKF45 7054V HDMI_2_BDP_Model 14 NC 13 CEC 5 DATA1_SHIELD 20 SHIELD 12 CLK 11 CLK_SHIELD 2 DATA2_SHIELD 19 HPD 18 5V_POWER 10 CLK 4 DATA1 1 DATA2 17 DDC CEC_GND 9 DATA0 8 DATA0_SHIELD 3 DATA2 16 SDA 7 DATA0 6 DATA1 15 SCL JK802 1 YKF45 7054V HDMI_1_BDP_Model 14 NC 13 CEC 5 DATA1_SH...

Page 30: ..._R C912 1uF 50V EXT_SPK R922 10K EXT_SPK R923 4 7K EXT_SPK EXT_AMP_L C917 0 22uF 50V EXT_SPK L902 BLM18PG121SN1D EXT_SPK R935 4 7K EXT_SPK C923 47uF 25V EXT_SPK 3 3V_Normal EXT_AMP_R R933 10K EXT_SPK C916 4 7uF 50V EXT_SPK EXT_SPK_DET C928 1uF 10V EXT_SPK R934 4 7K EXT_SPK IC901 TPA3124D2PWPR EXT_SPK 3 PVCCL_2 2 SD 4 MUTE 1 PVCCL_1 6 RIN 5 LIN 7 BYPASS 8 AGND_1 9 AGND_2 10 PVCCR_1 11 VCLAMP 12 PVC...

Page 31: ... C1019 18pF 50V TU1002 1 TDSS H101F SI2176_ATSC_1INPUT_H 5 B1 3 3V 11 DIF N 2 RESET 10 DIF P 4 SDA 1 NC 9 IF_AGC 8 CVBS 3 SCL 7 B2 1 8V 6 SIF 12 SHIELD A1 A1 B1 B1 R1026 0 TU_NON_BUFFER R1028 1K OPT R1025 0 TU_NON_BUFFER C1021 10uF 10V FULL_NIM 3 3V_TU 3 3V_TU R1021 0 ASIA RF_SWITCH_CTL 1 2V 1 8V_TU C1020 5pF 50V ASIA 3 3V_TU C1007 0 1uF 16V R1016 3 3 ASIA FE_TS_CLK Q1001 MMBT3906 NXP TU_BUFFER E ...

Page 32: ...PT L1100 70 ohm FHD L1101 BLM18SG700TN1D 70 ohm HD AUO_GND LGD_NC LVDS_SEL 30Pin LVDS Connector For HD 60Hz_Normal LVDS for large inch 51Pin LVDS Connector For FHD 60Hz RXB3 RXA4 RXA0 RXB4 RXB1 RXB1 RXA4 RXB3 RXA4 RXA2 RXB3 RXB2 MIRROR FOR FHD REVERSE 8bit RXA0 RXA3 RXB0 RXA2 RXACK RXA1 RXA4 RXB1 RXB3 RXA2 RXB2 RXB4 RXB3 RXB0 MIRROR RXB3 RXB2 RXBCK RXACK RXB3 RXB1 RXA1 RXA0 RXB2 RXB4 RXA2 RXA2 RXA...

Page 33: ...4 K2 VDD_5 K8 VDD_6 N1 VDD_7 N9 VDD_8 R1 VDD_9 R9 VDDQ_1 A1 VDDQ_2 A8 VDDQ_3 C1 VDDQ_4 C9 VDDQ_5 D2 VDDQ_6 E9 VDDQ_7 F1 VDDQ_8 H2 VDDQ_9 H9 NC_1 J1 NC_2 J9 NC_3 L1 NC_4 L9 NC_6 T7 VSS_1 A9 VSS_2 B3 VSS_3 E1 VSS_4 G8 VSS_5 J2 VSS_6 J8 VSS_7 M1 VSS_8 M9 VSS_9 P1 VSS_10 P9 VSS_11 T1 VSS_12 T9 VSSQ_1 B1 VSSQ_2 B9 VSSQ_3 D1 VSSQ_4 D8 VSSQ_5 E2 VSSQ_6 E8 VSSQ_7 F9 VSSQ_8 G1 VSSQ_9 G9 K4B1G1646G BCK0 IC1...

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