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LG 24LN451B Service Manual Download Page 1

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 :

CHASSIS :

MODEL :

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

 

SERVICE MANUAL

MFL67234649 (1308-REV00)

24LN451B   

24LN451B-PU

LJ31A

LED TV

Summary of Contents for 24LN451B

Page 1: ...p eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO CHASSIS MODEL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL MFL67234649 1308 REV00 24LN451B 24LN451B PU LJ31A LED TV ...

Page 2: ...s Inc All right reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 13 BLOCK DIAGRAM 20 EXPLODED VIEW 21 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ... 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 to the chassis the ...

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: ... 10 3 Power Voltage Standard input voltage 100 V 240 V 50 60 Hz Standard Voltage of each products is marked by mod els 4 Specification and performance of each parts are followed each drawing and specification by part number in accord ance 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 spe...

Page 7: ...ronment Temp 10 C 35 C Humidity 20 80 5 Storage Environment Temp 10 C 60 C non condensing Humidity 5 90 non condensing No Item Specification Remarks 1 Market AMERICA CANADA MEXICO 2 Available Channel 1 Digital ATSC 2 Analog NTSC 3 Receiving system ATSC NTSC M 4 Component Input 1EA Y Cb Cr Y Pb Pr 5 CVBS Input 1EA NTSC 1 System Rear NTSC CVBS Video input is used by common port with Component 6 RGB ...

Page 8: ... 50 00 74 25 HDTV 1080I 7 1920 1080 27 00 24 74 25 HDTV 1080P 8 1920 1080 33 75 30 00 74 25 HDTV 1080P 9 1920 1080 56 250 50 148 5 HDTV 1080P 10 1920 1080 67 43 67 5 59 94 60 148 35 148 50 HDTV 1080P 5 2 HDMI DTV 5 3 Component No Specification Remark Resolution H freq kHz V freq Hz Pixel clock MHz 1 720 480 15 730 59 940 13 500 SDTV DVD 480I 525I 2 720 480 15 750 60 000 13 514 SDTV DVD 480I 525I 3...

Page 9: ...XX bin by clicking Read 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message USB DOWNLOAD epk file download 1 Make New folder named LG_DTV and put ISP file epk in the folder 2 Put the USB Stick to the USB socket 3 Automatically detecting update file in USB Stick If your downloaded program version in USB Stick is Low it didn t work But your downloaded version is High U...

Page 10: ...or Characteristics 3 3 Function Check 3 3 1 Check display and sound Check Input and Signal items cf work instructions 1 TV 2 AV CVBS 3 COMPONENT 480i 4 RGB PC 1366 x 768 60 Hz 5 HDMI PC 1366 x 768 60 Hz 6 PC Audio In Display and Sound check is executed by Remote controller Caution Not to push the INSTOP KEY after completion if the function inspection NO Item CMD 1 CMD 2 Data 0 Enter download MODE ...

Page 11: ...k 4 0 Manual Download Model Name and Serial Number If the TV set is downloaded By OTA or Service man Some times model name or serial number is initialized Not always There is impossible to download by bar code scan so It need Manual download 1 Press the Instart key of ADJ remote controller 2 Go to the menu Model Number D L like below photo 3 Input the Factory model name ex GP4 LOW or Serial number...

Page 12: ...ndition with MHL Input Label HDMI PC DVI Mode 4 6 Model Name SW Version Adjust check Press the Instart key of ADJ remote controller 4 6 1 Model Name SW Version Check 1 Check Model Name 2 Check S W Version Refer to the IC Ver in the BOM 4 6 2 Adjust Check 1 Check Country Group 2 Check Area Option 3 Check Tool Option Refer to the BOM Comments 4 Check Adjust ADC Comp RGB is OK 5 Check EDID RGB HDMI i...

Page 13: ...e Level 5V Replace IC806 Recheck N Check IC802 Output Voltage Level 3 3V_ST Replace IC802 N Y Y Y Y Check IC801 Output Voltage Level 12V Replace IC801 N Y Check IC808 Output Voltage Level 2 5V Replace IC808 N Check X201 Clock 24MHz Replace X201 N Replace IC100 Flash Memory Y Check IC803 Output Voltage Level 1 15V Replace IC803 N Y Y Check IC807 Output Voltage Level 1 5V Replace IC807 N Check IC809...

Page 14: ...0 or R126 Check IC101 Replace Main Scaler IC N N Check Panel clock P601 9 10 Check IC101 Repair Main B D N Check Panel power P601 27 28 29 30 12V IC801 Output 12V Replace IC801 N Y Replace T con Board or module Check FFC Cable for damage or open conductors Replace Cable N Y Y Y Check LED Driver output LED Driver B d P1100 6 Check LED Driver IC1100 Replace LED Driver IC N Y ...

Page 15: ...ital TV Check RF Cable Check Tuner TU3600 Data CLK SYN VAL Replace Tuner TU3600 Recheck Y N 1 Check Tuner TU3700 5 Power 3 3V 2 Check IC803 Output voltage 3 3V Replace IC803 Y N Check Tuner TU3700 I2C Signal SCL R3735 SDA R3736 Check IC101 Y N 1 Check Tuner TU3700 7 Power 1 8V 2 Check IC805 Output voltage 1 8V Replace IC805 Y N ...

Page 16: ... Wave form of C220 Wave form of C218 Wave form of C222 Wave form of Comp Y Wave form of Comp Pb Wave form of Comp Pr Check input signal format Is it supported Check signal R239 R237 R241 C220 C218 C222 Replace R239 R237 R241 C220 C218 C222 Y N Check JK2800 Replace JK2800 or Check Device Y N Y IC101 has problem Y Check Component Cable ...

Page 17: ...ve form of R4024 Hsync Wave form of R230 C206 Wave form of R228 C204 Wave form of R232 C208 Check input signal format Is it supported Check Hsync Vsync R266 R267 Replace R266 R267 Check signal RGB R228 R230 R232 C204 C206 C208 N Check JK400 Replace JK400 or Check Device Y N Y Replace R228 R230 R232 C204 C206 C208 N IC101 has problem Y Check RGB Cable Y Y ...

Page 18: ...and service purposes 6 No Video HDMI Check input signal format Is it supported Y Check JK501 for proper connection or damage Replace connector Y N Y Check HDMI Cable for damage or open connector Check I2C Signal JK501 15 16 Re download EDID data Y N Check HDCP Key IC101 Replace Scaler IC101 N ...

Page 19: ... t hear any audio and Device support the audio signal normally Check Speaker and its wire connection P700 and the resistance Check Signal from IC700 L700 L701 L706 L709 Y Replace IC700 N Check R870 Voltage Level 3 3V Y Replace IC807 3 3V N Y Check Signal from IC101 SDA SCL R703 R214 R707 R213 Y Replace IC101 N Replace connector or Speaker N ...

Page 20: ... 20 LGE Internal Use Only Copyright LG Electronics Inc All right reserved Only for training and service purposes BLOCK DIAGRAM ...

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 300 200 120 900 400 910 540 800 810 510 301 302 511 L...

Page 22: ..._24 40 NC_25 41 I O4 42 I O5 43 I O6 44 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 PWM1 R148 33 C114 0 1uF RGB_DDC_SCL Q100 MMBT3904 NXP E B C PWM2 3 3V_Normal C103 0 1uF PWM2 PF_OE MULTI_ON IC103 1 M24256 BRMN6TP NVRAM...

Page 23: ...D_69 L9 GND_70 J8 GND_71 L12 GND_72 L13 GND_73 L18 GND_74 L19 GND_75 M8 GND_76 K8 GND_77 M10 GND_78 M11 GND_79 L14 GND_80 M15 GND_81 M16 GND_82 M18 GND_83 M25 GND_84 N10 GND_85 N11 GND_86 N13 GND_87 N14 GND_88 N15 GND_89 N16 GND_90 N17 GND_91 N19 GND_92 K7 GND_93 P8 GND_94 P9 GND_95 M9 GND_96 P11 GND_97 P13 GND_98 P16 GND_99 P17 GND_100 P18 GND_101 P12 GND_102 R8 GND_103 R9 GND_104 R11 GND_105 R12...

Page 24: ...EN_GND 8 BLUE_GND 9 NC 10 SYNC_GND 11 GND_2 12 DDC_DATA 13 H_SYNC 14 V_SYNC 15 DDC_CLOCK 16 SHILED 5V_Normal C414 220pF 50V DSUB NON 28INCH MODEL JP429 RGB_DDC_SCL JP428 IC400 AP2191DSG 3 IN_2 2 IN_1 4 EN 1 GND 5 FLG 6 OUT_1 7 OUT_2 8 NC PC_AUDIO_DET VA425 20V C413 220pF 50V DSUB NON 28INCH MODEL DSUB_HSYNC 2 E18 PC_R_IN USB_DM 1 AL8 5V_Normal VA403 5 5V DSUB NON 28INCH MODEL RGB_DDC_SDA R401 75 D...

Page 25: ...11 2 D2_GND 19 18 10 CK 4 D1 1 D2 17 9 D0 8 D0_GND 3 D2 16 7 D0 6 D1 15 CK _HDMI2 D0 _HDMI2 CK _HDMI2 D506 1 IP4283CZ10 TBA ESD_HDMI_NXP 3 GND_1 2 TMDS_CH1 4 TMDS_CH2 1 TMDS_CH1 5 TMDS_CH2 6 NC_1 7 NC_2 8 GND_2 9 NC_3 10 NC_4 VA513 20V OPT VA503 20V R521 2 7K VA502 20V VA510 20V OPT 3 3V_ST R528 1K Q505 MMBT3904 NXP E B C R529 10K HPD2 DDC_SCL_2 HDMI_CEC R520 100 D2 _HDMI2 D1 _HDMI2 R500 47K VA505...

Page 26: ...WER P601 10031HR 30 HD_CONNECTOR 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 JP603 R630 200 R604 270 1 10W 1 R610 330 1 10W 1 R624 5 6K R625 5 6K C605 0 1uF 16V R688 10K 1 16W 5 OPT R689 10K 1 16W 5 OPT R601 5 6K JP614 RXA1 RXACK P602 10031HR 30 FHD_CONNECTOR 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 RXB0 RXA3 RXA2 R...

Page 27: ...AGND_PLL 6 DVDD 5 DGND 7 SDATA 8 WCK 9 BCK 10 SDA 11 SCL 12 FAULT 13 MONITOR_0 14 MONITOR_1 15 MONITOR_2 16 BST2B 17 PGND2B 18 OUT2B 19 PVDD2B 20 PVDD2A 21 OUT2A 22 PGND2A 23 BST2A 24 VDR2 25 AGND 26 VCC5 27 VDR1 28 BST1B 29 PGND1B 30 OUT1B 31 PVDD1B 32 PVDD1A 33 OUT1A 34 PGND1A 35 BST1A 36 RESET 37 AD 38 CLK_I 39 GND_IO 40 VDD_IO 41 EP GND R738 12K AUD_MASTER_CLK 3 3V_Normal C723 22000pF 50V L701...

Page 28: ... 1uF 10V 19V C808 0 1uF 50V R834 22K 12V R843 15K 1 C839 10uF 10V C802 10uF 25V OPT C832 1uF 10V R827 100K 1 JP801 Q803 PMV48XP G D S C809 0 1uF 50V R830 1 R816 33K R803 47K C841 0 1uF 16V R831 47K R837 1K 1 C816 0 1uF 16V R823 10K 1 R820 10K 1 3 3V_ST C829 10uF 10V 12V R811 100K PANEL_CTL IC803 AP1117E18G 13 2 OUT 3 IN 1 ADJ GND 12V_PANEL_POWER R833 10K 3 3V_Normal R825 27K 1 R826 10K 1 C823 0 1u...

Page 29: ...28 C1119 100pF 50V 21 6 26 28 BLU_CURRENT_CTL R1103 10K 1 16W 21 6 26 28 C1121 4 7uF 50V 23 6 28 BOE JP1102 JP1101 C1137 1uF 50V 21 6 26 28 R1125 24K 1 23 6 28 BOE 24V_BLU R1109 30K 1 16W 21 6 26 28 MULTI_ON JP1106 C1138 1uF 50V 21 6 26 28 D1101 100V BR210 21 6 26 28 R1122 100K 23 6 28 BOE R1108 51K 1 16W 21 6 26 28 R1104 470K 1 16W 21 6 26 28 R1124 1 5K 1 23 6 28 BOE R1107 220K 1 16W 21 6 26 28 R...

Page 30: ...3_A 9 D12 A_DDR3_A 10 C16 A_DDR3_A 11 C13 A_DDR3_A 12 A15 A_DDR3_A 13 E11 A_DDR3_A 14 B13 A_DDR3_BA 0 F13 A_DDR3_BA 1 B15 A_DDR3_BA 2 E13 A_DDR3_MCLK C17 A_DDR3_MCLKZ A17 A_DDR3_MCLKE B16 A_DDR3_ODT E14 A_DDR3_RASZ B12 A_DDR3_CASZ A12 A_DDR3_WEZ C12 A_DDR3_RESET F11 A_DDR3_DQSL B19 A_DDR3_DQSLB C18 A_DDR3_DQSU B18 A_DDR3_DQSUB A18 A_DDR3_DQML E15 A_DDR3_DQMU A21 A_DDR3_DQL 0 D17 A_DDR3_DQL 1 G15 A...

Page 31: ...0 1uF 16V R3740 1 8K C3710 0 1uF 16V IF_AGC_MAIN TU_SDA R3736 33 L3703 UBW2012 121F L3707 C3711 18pF 50V C3713 18pF 50V C3715 22uF 6 3V C3723 22uF 6 3V TU3700 TDSS H501F B KR US SI2158_ATSC_1INPUT_H 5 B1 3 3V 11 DIF N 2 RESET 10 DIF P 4 SDA 1 NC_1 9 IF_AGC 8 NC_3 3 SCL 7 B2 1 8 6 NC_2 12 SHIELD A1 A1 B1 B1 3 3V_Normal GLOBAL tuner block except EU and China NC4_S7LRM EAX65410201 2012 11 18 1 should...

Page 32: ... COMP_Pb R2841 10K COMP_Pr D2817 5 6V OPT R2833 12K R2832 10K ZD2806 5 6B ZD2805 5 6B R2822 75 COMP_DET R2838 1K R2825 470K JP2811 3 3V_Normal JP2810 R2826 470K COMP_Y AV_CVBS_IN JK2800 PPJ234 05 5A GN O SPRING 6A GN E LUG 4A GN CONTACT 7B BL E LUG S 5B BL O SPRING 7C RD E LUG S 5C RD O SPRING_1 4C RD CONTACT_1 5D WH O SPRING 4E RD CONTACT_2 5E RD O SPRING_2 6E RD E LUG 20V D2816 D2815 20V COMP_R_...

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