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 : LD31P MODEL : 28LN45** 28LN45**-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 LD31P 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*800 49.702 59.810 83.500 9. 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 LD31P 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. => Check the Download to CI+ Key value in LG set. (1) Check the method of CI+ Key value 1) Check the method on Instart menu 2) Check the method of RS232C Command a.
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 IC809Output Voltage Level (3.3V_ST) N Replace IC809 Y Check IC802 output Voltage Level (12V) N Replace IC802 & Recheck N Replace IC806 & Recheck N Replace IC810 & Recheck N Replace IC807 & Recheck Y Check IC806 Output Voltage Level (1.15V) Y Check IC810 Output Voltage Level (2.5V) Y Check IC807 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 IC1101 Replace LED Driver IC Y Y Check LED Driver output (P1101 #1,2,3,4,5) Check Panel power P601(#27,28,29,30) 12V IC802 Output 12V N Replace IC802 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. No Video - Digital TV Check RF Cable Y 1.
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 R237,R239,R241 C218,C220,C222 Y Check signal R237,R239,R241 C218,C220,C222 Y IC101 has problem Wave f orm of C218 Wave f orm of C220 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 JK501 for proper connection or damage Replace connector Y N Check I2C Signal (JK501) (#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. Y Check Speaker and its wire connection (P700) and the resistance N Replace connector or Speaker Y 1.
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EXPLODED VIEW IMPORTANT SAFETY NOTICE 910 501 531 300 510 511 A2 301 A31 200 900 801 800 LV1 540 521 120 400 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 WP NC_11 R106 1K NC_12 R102 3.
R203 OPT RF_SWITCH_CTL 100 B8 MODEL_OPT_7 A8 1 0 1 1 Ginga OPT OPT OPT OPT 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF OPT OPT OPT 111128 Zener Add MIU1-NO_DDR MIU1-128M Dual Stream is only Korea 3D spec NON_DualStream DualStream MODEL_OPT_2 MODEL_OPT_3 256M 256M+128M OPT C304 DVB_S ZD201 5.6B C302 MIU0-256M NON_DVB_S 1 C298 MIU0-128M T24 0 0 C291 U23 MODEL_OPT_5 0 C260 MODEL_OPT_4 128M 128M+128M C292 M120 +1.
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.
HDMI HDMI_1 CEC R520 100 R506 47K OPT R504 47K OPT +3.3V_ST HDMI_CEC OPT R505 10K C Q500 MMBT3904(NXP) B OPT E OPT VA504 5V_HDMI_1 CEC_REMOTE_S7 5V_DET_HDMI_1 5V_HDMI_1 5V_HDMI_2 +5V_Normal +5V_Normal +3.3V_ST OPT 19 OPT VA512 20V OPT 18 VA511 20V 17 B DDC_SDA_1 HDMI_ARC OPT EAG61491201 7 6 5 4 3 2 1 OPT VA500 20V HDMI_CEC OPT VA508 20V (OPT)ESD_HDMI_SEMTECH(DEV) D504 RCLAMP0524PA 10 1 CK-_HDMI1 2 9 CK+_HDMI1 3 8 OPT VA507 20V 12 8 R518 2.7K 2.
Module IR/LED and Control +3.3V_ST KEY2 KEY_SCL R614 100 KEY_SDA +3.3V_ST 270 JP600 JP601 R615 100 R610 1/10W Amber LED(Non M73):5.9mA R617 3.3K P601 10031HR-30 1 1 2 2 3 +3.3V_ST R604 L600 BLM18PG121SN1D R616 3.3K KEY1 P600 12507WR-12L JP602 4 3 330 5 1/10W JP605 4 RXA3+ 6 RXA3- 7 Red LED(Non M73):4.
L700-*1 10.0uH (OPT)Audio_Coil_TAIYO NRS6045T100MMGK AUDIO AMP L706-*1 10.0uH (OPT)Audio_Coil_TAIYO AMP_RST C706 1000pF 50V 50V NRS6045T100MMGK C711 L702 0 AUD_MASTER_CLK AGND_PLL 1 VDD_PLL 2 DGND_PLL 3 GND 4 DGND 5 6 SDATA 7 SDA PVDD1B PVDD1A 32 33 OUT1A PGND1A 34 RESET AD CLK_I BST1A 35 36 31 PGND1B 28 BST1B 27 VDR1 26 VCC5 25 AGND 24 VDR2 18 19 20 PVDD2A 17 PGND2B OUT2B 16 PVDD2B 15 BST2B 5.1K C740 0.1uF 50V LPH6045T-100M R704 12 R728 5.
36K 11.10.27 C818 0.1uF 50V C807 0.1uF 16V JP800 C820 111129 47uF 47uF DEL 25V 300K R815 1 111129 Discharging R DEL (0RJ2201J674) FREQ 12.03.08 EAE42868301(3225)-> EAE61081701(3216) 6 GND EN 2 5 FB 4 11.11.07 6604->6601 C869 220pF 50V R816 68K R819 0 OPT C808 150pF 50V R838 15K 1% C840 10uF 10V C814 0.1uF 50V POWER_ON/OFF1 VOLTAGE HIGHER 11.11.05 +2.5V_Normal S C895 0.
LED DRIVER +19V L1100 10uH D1101 BR210 12.05.17 C1110 EAE62721801 33uF, C1111 0CH8106J691 10uF -> EAE60171701 68uF 2EA +24V_BLU 100V C1112 47uF 25V C1113 10uF 25V C1115 0.1uF 50V OPT C1119 100pF R1107 220K R1109 30K 50V 1/16W 1/16W IC1101 TPS40210DGQR C1135 68uF 35V C1136 68uF 35V C1137 1uF 50V C1138 1uF 50V OPT C1139 1uF 50V [EP] +3.3V_ST SS DIS/EN C R1101 4.7K Q1102 MMBT3904(NXP) B R1102 10K COMP 2 9 8 3 4 7 5 6 VDD BP D R1113 3.
R1227 1uF 0.1uF 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 CLose to DDR3 +1.5V_DDR B-MVREFDQ B-MVREFCA C1247 A-MVREFCA 1000pF C1204 1% 1K C1203 R1205 0.1uF A-MVREFDQ 1000pF 0.1uF C1202 C1201 +1.5V_DDR 1K 1% R1204 +1.5V_DDR 1K 1% 1% R1202 1K R1201 +1.
* 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 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] CI_TS_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] 10K 47 R1921 10K FE_TS_DATA[0-7] R1929 CI_MISTRT 46 12 CI_ADDR[8] 47 13 CI_ADDR[13] CI
NETCAST4.0 EU&CHUNA_TUNER_BLOCK ERROR & VALID PIN FE_TS_VAL_ERR RF_SWITCH_CTL (OPT)TUNER_T/C_H/NIM TU2603 TDSS-G501D(B) GPIO must be added. OPT C2629 0.1uF 16V 1 2 3 4 5 6 7 8 9 10 11 B1 B1 A1 NC_1 1 RESET 2 SCL 3 SDA 4 3.3V 5 NC_2 6 1.8V 7 NC_3 8 IF_AGC 9 DLIF_[P] 10 DLIF_[N] 11 12 A1 13 12 14 SHIELD TU_GND_B 15 16 17 18 19 20 21 22 23 24 25 26 1 RESET 2 SCL 3 SDA 4 +B1[3.3V] 5 SIF 6 +B2[1.
DVB-S2 LNB Part Allegro Input trace widths should be sized to conduct at least 3A Ouput trace widths should be sized to conduct at least 2A 3A +12V_LNB 2A D2705-*1 Max 1.3A 40V (OPT)LNB_SX34 3.5A 30V 40V LNB_SMAB34 C2704 10uF 25V C2705 10uF 25V C2706 10uF 25V close to Boost pin(#1) C2707 0.1uF C2703 0.01uF 50V SP-7850_15 15uH SMAB34 D2705 L2702 D2703 C2708 10uF 25V A_GND A_GND LX 10 9 VIN 14 GND 13 VREG 12 ISET 11 TCAP R2703 36K 0.
SCART / COMPONENT&CVBS SCART AMP COMP_NON_ADC_FILTER L2807-*1 (OPT)COMP_ADC_FILTER_L 0 L2807 CM2012FR10KT COMPONENT&CVBS +12V_Normal 121118 SCART AMP IC change COMP_Y+/AV_CVBS_IN 121017 Change (OPT)COMP_ADC_FILTER C2830 47pF 50V (OPT)COMP_ADC_FILTER C2829 47pF 50V 5.6B R2822 ZD2806 75 5.6B ZD2807 +3.3V_Normal R2837 10K +5V_USB 130219 BJ.KIM OPT R2801 0 R2800 0 R2838 1K C2817 0.1uF 50V AV_CVBS_DET OPT D2817 5.6V COMP_NON_ADC_FILTER L2806-*1 0 R2847 2.