Internal Use Only North/Latin America Europe/Africa Asia/Oceania http://aic.lgservice.com http://eic.lgservice.com http://biz.lgservice.com LED TV SERVICE MANUAL CHASSIS : LC31A / LD31T MODEL : 22LN45** 22LN45**-Z* CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS CONTENTS . ............................................................................................. 2 SAFETY PRECAUTIONS ......................................................................... 3 SERVICING PRECAUTIONS ................................................................... 4 SPECIFICATION ....................................................................................... 6 ADJUSTMENT INSTRUCTION ................................................................
SAFETY PRECAUTIONS 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 Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First. General Servicing Precautions 1.
IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above. Removal 1.
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to the LED TV used LC31A / LD31T chassis. 3. Test method 2. Requirement for Test 1) Performance: LGE TV test method followed 2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC Each part is tested as below without special appointment.
No.
5. Timing 5.1. RGB/HDMI (PC) No. Specification Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 1. 720*400 31.468 70.080 28.321 2. 640*480 31.469 59.940 25.175 3. 640*480 37.500 75.000 31.500 4. 800*600 37.879 60.317 40.000 5. 800*600 46.875 75.000 49.500 6. 1024*768 48.363 60.004 65.000 7. 1024*768 60.023 75.029 78.750 8. 1280*720 45.000 60.000 74.250 9. 1280*800 49.702 59.810 83.500 10. 1366*768 47.717 59.79 85.5 Remark 5.2. HDMI (DTV) No.
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. 720*576 15.625 50.000 13.500 SDTV, DVD 576I(625I) 50Hz 4. 720*480 31.470 59.940 27.000 SDTV 480P 5. 720*480 31.500 60.000 27.027 SDTV 480P 6. 720*576 31.250 50.000 27.000 SDTV 576P 50Hz 7. 1280*720 44.960 59.940 74.176 HDTV 720P 8. 1280*720 45.000 60.000 74.
ADJUSTMENT INSTRUCTION 1. Application Range 4) Click “Read” tab, and then load download file(XXXX.bin) by clicking “Read”. This document is applied to LC31A / LD31T chassis LED TV which is manufactured in TV(or Monitor) Factory or is produced on the basis of this data. (4) filexxx.bin 2. Designation 1) T he adjustment is according to the order which is designated and which must be followed, according to the plan which can be changed only on agreeing. 2) Power adjustment : Free Voltage.
3.1. EDID Process 3.2. Function Check 3.1.1. EDID download 3.2.1. Check display and sound (1) Press "Power only" key of service remote control. (2) Press the ADJ KEY on R/C and enter EZ ADJUST (3) Enter EDID D/L mode by pushing "►" key at "11. EDID D/L". (4) EDID download is executed automatically. (5) Press EXIT key on service remote control. *Check Input and Signal items. (cf.
4. Total Assembly line process 4.1. Tool option & ADC Check (1) Press "Power on" key of service remote control. (2) Connect USB Port → USB to Serial Adapter (UC-232A) → RS-232C cable → PC(RS-232C port) (3) Check the 'Tool Option'(Refer to the BOM Comments or Adjustment spec) (4) Check the ‘ADC’ is ok. 4.2. Model name & Serial number download 4.2.1. Model name & Serial number D/L 1) Press "Power on" key of service remote control. 2) Connect RS232 Signal Cable to RS-232 Jack.
4.3. Function Check 4.4. White balance adjustment 4.3.1. Check display and sound - Equipment (1) Color Analyzer: CA-210 (LED Module : CH 14) (2) Adj. Computer(During auto adj., RS-232C protocol is needed) (3) Adjust Remote control ■ Check Input and Signal items. (cf.
4.5. DPM Operation check ■ Measurement Condition: 100~240V@ 50/60Hz (1) Set Input to RGB-PC and connect D-sub cable to set RGB Mode. Set Input to HDMI(with Input Label set to PC) and connect HDMI cable to set - HDMI Mode (2) Cut off H sync or V sync of signal. (3) Check DPM operation refer to the below table.
TROUBLE SHOOTING 1. No Power Check C820 All Voltage Level (19V) N Check Power connector OK ? N Replace Adapter Y Check IC809 Output Voltage Level (3.3V_ST) N Replace IC809 Y Check IC802 output Voltage Level (12V) N Replace IC802 & Recheck Y Check IC810 Output Voltage Level (2.5V) N Replace IC810 Y Check IC807 Output Voltage Level (1.5V) N Replace IC807 Y Check IC806 Output Voltage Level (1.
2. No Picture Module Back Light On ? N Check WLED_ENABLE high R131 N Check IC101 Replace Main Scaler IC N Check LED Driver IC1100 Replace LED Driver IC Y Y Check LED Driver output (LED Driver B’d P1101 #1,2,3,4,9,10,11,12) Check Panel power P601(#27,28,29,30) 12V IC804Output 12V N Replace IC804 Y Check Panel clock P601(#9,10) N Check IC101 Repair Main B/D Y Check FFC Cable for damage or open conductors. N Replace Cable Y Replace T-con Board or module 3.
4. No Video - Component Check input signal format Is it supported? Y Wave f orm of Comp Y Wave f orm of Comp Pb Check Component Cable Wave f orm of Comp Pr Y Check JK2800 N Replace JK2800 or Check Device N Replace R239,R237,R241 C220,C218,C222 Y Check signal R239,R237,R241 C220,C218,C222 Y IC101 has problem Wave f orm of C220 Wave f orm of C218 Wave f orm of C222 5.
6. No Video - HDMI Check input signal format Is it supported? Y Check HDMI Cable for damage or open connector Y N Check JK500,501 for proper connection or damage Replace connector Y N Check I2C Signal (JK500,501) (#15, #16) Re download EDID data Y N Check HDCP Key (IC101) Replace Scaler(IC101) 7. No Audio Make sure you can’t hear any audio and Device support the audio signal normally.
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EXPLODED VIEW IMPORTANT SAFETY NOTICE 502 501 300 510 301 511 A2 A31 200 801 800 122 540 120 LV1 521 900 400 910 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.
IC102 H27U1G8F2CTR-BC /PF_WP NC_11 R106 1K NC_12 R102 3.3K NC_13 NC_14 NC_15 15 34 16 33 17 32 18 31 19 30 20 29 21 28 22 27 23 26 24 25 AE21 AB21 Y15 NC_22 OPT 4.7K R152 4.7K OPT OPT C103 0.1uF VSS_2 R123 VCC_2 4.7K NC_23 4.
MODEL OPTION R203 RF_SW_OPT RF_SWITCH_CTL 100 Note +1.15V_VDDC VDDC 1.15V 0 MODEL_OPT_5 T24 NON_DVB_S DVB_S MODEL_OPT_6 B8 MIU1-NO_DDR MIU1-128M 1 MODEL_OPT_7 A8 NON_DualStream DualStream 0.1uF 0.1uF 0.1uF 0.1uF OPT OPT OPT C304 1 1 OPT C302 256M 256M+128M MIU0-256M OPT C291 MIU0-128M OPT C298 U23 OPT 0.1uF C276 MODEL_OPT_4 OPT 0.1uF 3D C260 NON_3D 0.1uF 10uF T25 C299 10uF MODEL_OPT_3 C292 1 0.
C +5V_Normal USB(SIDE) PC AUDIO(SIDE) 0 R421 OPT R420 D416 MMBD6100 A2 0 +3.3V_ST DSUB RGB IC400 AP2191DSG +5V_USB A1 NC +3.3V_Normal OUT_2 OUT_1 12.08.10 47K->470K R413 10K R408 10K R407 470K C400 0.1uF R409 1K PC_AUDIO_DET C404 10uF 10V OPT FLG 8 1 7 2 6 3 5 4 GND IN_1 IN_2 C405 EN USB_CTL RGB_DDC_SCL OPT R403 0 JP400 2:E18 DSUB_HSYNC JP401 VA417 20V OPT OPT R404 0 JP409 L401 BLM15BD121SN1 R434 47K R442 470K 12.07.02 BY.
HDMI HDMI_1 CEC +3.3V_ST R504 47K R506 47K R520 100 5V_DET_HDMI_1 R505 10K C Q500 MMBT3904(NXP) B E OPT VA504 5V_HDMI_1 CEC_REMOTE_S7 HDMI_CEC +5V_Normal 5V_HDMI_1 5V_HDMI_2 +5V_Normal +3.3V_ST OPT 1K 19 VA511 20V 17 Q502 MMBT3904(NXP) OPT VA512 20V OPT 18 DDC_SDA_1 OPT EAG61491201 6 5 4 3 2 1 2.7K R521 R522 2.7K 2.7K A2 A1 120915 47K->2.7K DDC_SDA_1 DDC_SDA_2 DDC_SCL_1 DDC_SCL_2 HDMI_ARC OPT VA507 20V 12 7 R518 2.
Module IR/LED and Control +3.3V_ST KEY2 KEY_SCL R614 100 KEY_SDA +3.3V_ST 270 R617 3.3K JP600 JP601 P601 10031HR-30 1 1 2 2 3 +3.3V_ST R604 L600 BLM18PG121SN1D R616 3.3K KEY1 P600 12507WR-12L R615 100 R610 JP602 330 4 3 5 JP605 120915 RED LED setting : 9.6->7.9mA JP604 4 5 RXA3+ 6 RXA3- 7 8 JP603 Amber LED setting : 9.
L700-*1 10.0uH Audio_Coil_TAIYO NRS6045T100MMGK AUDIO AMP +3.3V_AMP L706-*1 10.0uH AMP_RST C706 1000pF 50V 50V C711 AUD_MASTER_CLK 1 VDD_PLL 2 DGND_PLL 3 GND 4 DGND 5 12.08.09 PVDD1B OUT1A PVDD1A 32 33 PGND1A BST1A 34 35 AD CLK_I GND_IO RESET 36 37 31 JP704 25 AGND 24 VDR2 JP705 23 BST2A 21 OUT2A 20 17 PGND2B PVDD2A 16 BST2B 19 15 MONITOR_2 18 14 MONITOR_1 OUT2B 13 PVDD2B 12 MONITOR_0 5.1K VCC5 10 TP701 R728 VDR1 SDA TP700 C740 0.
+3.3V_ST 3 5 FB 4 11.11.07 6604->6601 C869 220pF 50V R816 68K R819 0 OPT C808 150pF 50V R838 15K 1% POWER_ON/OFF1 VOLTAGE HIGHER 11.11.05 POWER_ON/OFF1 2K R855 OPT R873 10K 1% 12.03.08 EAE42868301(3225)-> EAE61081701(3216) 8 GND SS 1 7 2 6 3 5 C835 0.033uF 50V R884 180K L803 FB 4 1 3 1 ADJ/GND 0 C836 10uF 10V C837 0.1uF 50V R865 1 C843 1uF 10V OPT C906 0.1uF 50V C842 10uF 10V R825 10K 1% M1 Core OPT R811 100K 1% +1.15V_VDDC R812 POWER_ON/OFF1 4.7K 11.11.07 0.
11.11.29 Diode change canceled(111202) EAH61112701->EAH61533501 +19V 11.11.15 1K->100ohm 1000pF->100pF C1116 100pF 50V C1121 4.7uF 50V 12.08.11 24K->22K PGND_2 4 5 24 23 22 21 20 VIN PDIM R1123 100K RISET BLU_CURRENT_CTL 6 19 7 18 R1124 1.5K 1% LS8 R1125 24K 1% LS7 8 17 9 16 10 15 11 14 12 13 0 Q1103 AOD478 G 12.01.10 Main AOD478 Sub AP18T10GH LS5 JP1100 NC_2 JP1101 +24V_BLU R1107 220K R1109 30K 50V 1/16W 1/16W IC1101 TPS40210DGQR VREF CS R1137 0.
R1227 AVDD_DDR0 L1202 CIC21J501NE 0.1uF 1uF C1220 1uF C1241 1uF C1238 1uF C1219 1uF C1218 C1217 0.1uF 0.1uF C1239 10uF C1206 OPT C1251 1K 1% 1% 0.1uF C1250 1K 1000pF C1249 1% R1225 1K 0.1uF C1248 1000pF CLose to Saturn7M IC +1.5V_DDR R1228 R1224 1K 1% CLose to Saturn7M IC B-MVREFDQ B-MVREFCA C1247 A-MVREFCA 1000pF 0.1uF C1204 1% R1205 1K C1203 1000pF 0.
* Option name of this page : CI_SLOT (because of Hong Kong) CI Region CI SLOT +5V_CI_ON CI_DATA[0-7] CI TS INPUT P1900 EAG41860102 10067972-000LF R1903 10K FE_TS_DATA[7] FE_TS_DATA[6] FE_TS_DATA[5] CI_MDI[5] FE_TS_DATA[4] CI_MDI[4] AR1906 /CI_CD1 R1908 100 3 38 4 CI_DATA[4] CI_DATA[5] 39 5 CI_DATA[6] CI_TS_DATA[6] CI_TS_DATA[7] 40 6 CI_DATA[7] 41 7 42 8 43 9 CI_IORD 44 10 CI_ADDR[11] CI_IOWR 45 11 CI_ADDR[9] 47 R1921 10K FE_TS_DATA[0-7] R1929 CI_MISTRT 12 47 13 CI_AD
NETCAST4.0 EU(DVB-T/C)_TUNER_BLOCK RF_SW_OPT R2603 0 RF_SWITCH_CTL TU2600 TDSS-G501D 12.08.14 diagonal noise improve OPT C2624 0.1uF 16V 1 2 3 4 5 6 7 8 9 10 11 B1 B1 A1 +3.3V_TU Close to TUNER C2603 0.1uF 16V RF_SW_OPT TU_I2C_FILTER R2609-*1 MLG1005SR27JT NC R2614 100K R2611 100 TUNER_RESET C2622 0.1uF 16V +3.3V_TU TU_I2C_FILTER R2610-*1 MLG1005SR27JT RESET R2870 1K SCL TU_I2C_NON_FILTER R2609 33 SDA TU_I2C_NON_FILTER R2610 33 C2612 20pF 50V R2871 1K +3.
SCART / COMPONENT&CVBS COMPONENT&CVBS COMP_ADC_FILTER_L L2807 CM2012FR10KT SCART AMP COMP_NON_ADC_FILTER L2807-*1 0 COMP_Y+/AV_CVBS_IN COMP_ADC_FILTER C2830 47pF 50V SCART JACK IC2800 SN324 DTV/MNT_L_OUT R2838 1K SCART JACK R2847 2.