LG 28LN45 Series Service Manual Download Page 34 | Manualshive

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Summary of Contents for 28LN45 Series

Page 1: ...P MODEL 28LN45 28LN45 Z 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: ...s Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 15 BLOCK DIAGRAM 19 EXPLODED VIEW 20 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: ...ctrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharg ing 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 e...

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: ...and Netherlands Belgium Luxemburg Greece Denmark Czech Austria Hungary Swiss Croatia Turkey Norway Slovenia Poland Ukraine Portu gal Ireland Morocco Latvia Estonia Lithania Rumania Bulgaria Russia SlovakiaBosnia Serbia Albania Kazakhstan Belarus 4 Country Nordic option EU model only Denmark Finland Norway Sweden DTV MPEG2 4 DVB T2 8 countries UK Denmark Sweden Finland Norway Ireland Ukraine Kaza k...

Page 7: ...bols s Modulation 16QAM 64 QAM 128 QAM and 256 QAM DVB S S2 symbolrate DVB S2 8PSK QPSK 2 45 Msymbol s DVB S QPSK 2 45 Msymbol s viterbi DVB S mode 1 2 2 3 3 4 5 6 7 8 DVB S2 mode 1 2 2 3 3 4 3 5 4 5 5 6 8 9 9 10 4 Scart Jack 1EA PAL SECAM Scart 1 Jack is Full scart and support RF OUT analog 5 Component Input 1EA Y Pb Pr 6 CVBS Input 1EA PAL SECAM NTSC 4 System Rear PAL SECAM NTSC PAL60 CVBS Video...

Page 8: ... 59 810 83 500 9 1366 768 47 717 59 79 85 5 5 2 HDMI DTV No Specification Remark Resolution H freq kHz V freq Hz Pixel clock MHz 1 720 480 31 469 31 5000 59 940 60 000 27 000 27 030 SDTV 480P 2 720 576 31 250 50 000 27 864 SDTV 576P 3 1280 720 37 500 50 000 74 250 HDTV 720P 4 1280 720 44 960 45 000 59 940 60 000 74 170 74 250 HDTV 720P 5 1920 1080 33 720 33 750 59 940 60 000 74 170 74 250 HDTV 108...

Page 9: ...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 74 250 HDTV 720P 9 1280 720 37 500 50 000 74 250 HDTV 720P 50Hz 10 1920 1080 33 720 59 940 74 176 HDTV 1080I 11 1920 1080 33 750 60 000 74 250 HDTV 1080I 12 1920 1080 28 125 50 000 74 250 HDTV 10...

Page 10: ...essage 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 USB data is automatically detecting 4 Show the message Copying files from memory 5 Updating is starti...

Page 11: ... push the INSTOP key after completion if the function inspection 3 3 CI key writing process Device CN 3 3 1 Communication Port Connection Connection PCBA USB Port USB to Serial Adapter UC 232A RS 232C cable PC RS 232C port Caution LD31Q LD31A chassis support only UC 232A driver only use this one 3 3 2 CI Key Download 1 Set CI Key path Directory at Start Mac CI Download Programme 2 Set COM 1 2 3 4 ...

Page 12: ...al number D L 1 Press Power on key of service remote control 2 Connect RS232 Signal Cable to RS 232 Jack 3 Write Model Name Serial Number by use RS 232 4 Must check the serial number at the Diagnostics of SET UP menu 4 2 2 Method notice 1 Model Name Serial Number D L is using of scan equipment 2 Setting of scan equipment operated by Manufacturing Technology Group 3 Serial number D L must be confor...

Page 13: ... 2 Adj Computer During auto adj RS 232C protocol is needed 3 Adjust Remote control RGB Gains are fixed data for each model Insert RS 232C Jack which is connected with PC for White Balance or equivalent device Total Assembly line should be check whether the color coordinate x y data refer to below table were meet or not Cool Panel Note x y coordinates are drifted about 0 007 after 30 mins heat run ...

Page 14: ...rsion Adjust check Press the Instart key of ADJ remote control 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 is OK After check all Press the EXIT key of ADJ remote control to go o...

Page 15: ...Replace Adapter N N Check IC802 output Voltage Level 12V Replace IC802 Recheck N Check IC809Output Voltage Level 3 3V_ST Replace IC809 N Y Check IC806 Output Voltage Level 1 15V Replace IC806 Recheck N Y Y Check IC810 Output Voltage Level 2 5V Replace IC810 Recheck N Y Check IC807 Output Voltage Level 1 5V Replace IC807 Recheck N Y Check X201 Clock 24MHz Replace X201 N Replace IC100 Flash Memory Y...

Page 16: ...C802 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 P1101 1 2 3 4 5 Check LED Driver IC1101 Replace LED Driver IC N Y 3 No Video Digital TV Check RF Cable Check Tuner TU2602 Data CLK SYN VAL Replace Tuner TU2602 Recheck Y N 1 Check Tuner TU2602 5 Power 3 3V 2 Check IC803 Output voltage 3 3V Replace IC803 Y N Check Tuner...

Page 17: ...heck Component Cable Wave form of C218 Wave form of C220 Wave form of C222 Wave form of Comp Y Wave form of Comp Pb Wave form of Comp Pr 5 No Video RGB 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 Che...

Page 18: ...l JK501 15 16 Re download EDID data Y N Check HDCP Key IC101 Replace Scaler IC101 N 7 No Audio Make sure you can 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 1 Check C820 Voltage Level 19V 2 Check Audio Amp IC700 Power 19V 3 3V Y Replace IC809 3 3V or Adapter...

Page 19: ...3 SDRAM 1GB NAND Flash 1GB 74LCX244 Buffer IC501 CI_CLK CI_VIAL Error CI_SYNC CI_DATA 0 7 CI ADDR 0 7 PCM_DATA 0 7 PCM_A 0 7 CI_ADDR 0 14 REG CI_OE CI_IORD CI_IOWR CI WE PCM_A 0 14 FE_DE_SDA SCL SERIAL Flash CVBS Scart RGB TV L R Sound F_RB PF OE PF_CEO SPI_CK SPI_CI SPI_CS SPI_DO DDR2 Data 0 15 DDR2 Address 0 12 DDR2 Data 0 15 DDR2 Address 0 12 System EEPROM EEPROM SCL SDA Panel DMB LED Driver IC...

Page 20: ...nd 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 IMPOR...

Page 21: ...3 BLU_CURRENT_CTL PCM_IRQA MODEL_OPT_4 R160 4 7K R107 1K 3 3V_ST R175 10K OPT IC101 1 LGE2121 MS M1_L13_MS10 S7LR M_MS10 NON KR US PCMDATA 0 GPIO129 W21 PCMDATA 1 GPIO130 AA18 PCMDATA 2 GPIO131 AB22 PCMDATA 3 GPIO123 AE20 PCMDATA 4 GPIO122 AA15 PCMDATA 5 GPIO121 AE21 PCMDATA 6 GPIO120 AB21 PCMDATA 7 GPIO119 Y15 PCMADR 0 GPIO128 W20 PCMADR 1 GPIO127 V20 PCMADR 2 GPIO125 W22 PCMADR 3 GPIO124 AB18 PC...

Page 22: ...5 47 C270 0 1uF OPT C233 0 047uF R297 0 OPT DSUB_B C227 0 047uF R225 1K MODEL_OPT_MIU0 128M 10uF C275 USB_DP SOC_RESET C245 2 2uF MODEL_OPT_6 C235 0 1uF C273 0 1uF CK _HDMI1 C303 0 1uF 1 5V_DDR C278 10uF C201 0 1uF OPT COMP_Y AV_CVBS_IN C200 4 7uF 10V R233 68 DSUB_VSYNC IC101 MSD804KKX S7LR M_NON_MS10 RXACKP J2 RXACKN J3 RXA0P K3 RXA0N J1 RXA1P K2 RXA1N K1 RXA2P L2 RXA2N L3 DDCDA_DA GPIO27 T5 DDCD...

Page 23: ... 3 3V_ST R434 47K R418 47K MGJ63348202 M1 1 JackShield for CKD MGJ63348201 M1 JackShield for NonCKD JP411 PC_AUDIO_DET VA407 20V OPT R409 1K R441 470K OPT 3 3V_Normal PM_RXD R403 0 OPT JP405 R404 0 OPT R405 0 OPT PM_TXD R406 0 OPT R429 0 C403 18pF 50V OPT DSUB_HSYNC 2 E18 JK400 SPG09 DB 010 1 RED 2 GREEN 3 BLUE 4 GND_1 5 DDC_GND 6 RED_GND 7 GREEN_GND 8 BLUE_GND 9 NC 10 SYNC_GND 11 GND_2 12 DDC_DAT...

Page 24: ...2 9 NC_3 10 NC_4 VA514 20V OPT Q508 LN4500 E B C 3 3V_ST 3 3V_Normal 5V_HDMI_1 R506 47K OPT R510 10K OPT D507 RCLAMP0524PA OPT ESD_HDMI_SEMTECH DEV 1 8 2 7 3 6 4 5 9 10 HDMI_CEC DDC_SCL_1 MHL_OCP_EN D1 _HDMI1 R504 47K OPT D503 MMBD6100 A2 C A1 R524 10K LN4500 C503 0 1uF LN4500 3 3V_ST R512 0 1 16W 5 LN4500 VA501 20V OPT D501 MMBD6100 A2 C A1 Q501 MMBT3904 NXP E B C CK _HDMI1 R534 10K LN4500 D2 _HD...

Page 25: ...1 JP607 C601 1000pF 50V C600 0 1uF 50V JP606 Q600 MMBT3904 NXP E B C R615 100 P600 12507WR 12L 1 2 3 4 5 6 7 8 9 10 11 12 13 JP603 R616 3 3K 3 3V_ST JP610 C603 100pF 50V OPT JP611 LED_RED LED_AMBER JP604 C602 100pF 50V OPT KEY1 JP602 R626 4 7K JP612 R625 4 7K C607 1000pF 50V R624 4 7K R627 4 7K C606 10uF 25V RXA2 C605 0 1uF 50V R629 0 RXA3 RXA0 RXACK RXA1 RXA2 RXACK R628 0 RXA1 P601 10031HR 30 1 2...

Page 26: ... Audio_Coil_TAIYO 10 0uH JP700 R710 1K LN4500 VA702 20V LN4500 R719 12 D710 KDS226 A AC C D704 100V 1N4148W OPT 0 1uF C707 16V JP707 R718 12 R730 5 1K C729 390pF 50V R704 12 R736 470 JP706 C720 10uF 10V JK700 KJA PH 1 0177 2 LN4500 3 M3_DETECT 4 M4 5 M5_GND 1 M1 6 M6 D706 100V 1N4148W OPT D709 MMBD6100 LN4500 A2 C A1 C731 390pF 50V C705 33pF 50V L706 1 NRS6045T100MMGK OPT Audio_Coil_TAIYO 10 0uH C...

Page 27: ...V Q804 MMBT3904 NXP E B C R809 10 MULTI_ON 3 3V_AMP C838 0 033uF 50V R849 0 5 R818 8 2K C813 0 47uF 16V OPT R815 300K Q803 AO3407A G D S R855 2K 1 R869 47 C869 220pF 50V R865 1 R805 4 7K R817 4 7K R836 10K JK800 KJA DC 1 0032 1 2 4 C879 4 7uF 10V OPT R810 10K IC809 MP1584EN 3 COMP 2 EN 4 FB 1 SW 5 GND 6 FREQ 7 VIN 8 BST 9 EP GND C877 0 1uF 50V C825 0 01uF 50V R833 10K 1 C858 10uF 10V OPT R839 4 7K...

Page 28: ... 3 3V_ST JP1111 R1101 4 7K Q1102 MMBT3904 NXP E B C JP1110 C1135 68uF 35V R1111 1K 1 16W C1113 10uF 25V C1119 100pF 50V R1103 10K 1 16W C1137 1uF 50V 24V_BLU R1109 30K 1 16W C1112 47uF 25V MULTI_ON C1138 1uF 50V D1101 100V BR210 R1110 100 1 16W OPT R1108 51K 1 16W R1104 470K 1 16W C1133 1uF 10V OPT R1107 220K 1 16W R1112 0 1 16W OPT C1131 1uF 25V C1132 0 1uF 25V P1101 20022WR 14A00 24V 24V 24V 24V...

Page 29: ...C1215 0 1uF B MDMU A MCKB C1210 0 1uF C1207 0 1uF C1212 0 1uF C1211 0 1uF C1249 1000pF C1214 0 1uF C1248 0 1uF 1 5V_DDR A MRESETB R1224 1K 1 B MA3 A MDQSUB B MVREFDQ R1203 240 1 R1225 1K 1 C1247 1000pF B MA0 B MVREFCA R1228 1K 1 1 5V_DDR R1227 1K 1 C1250 0 1uF 1 5V_DDR C1206 0 1uF 1 5V_DDR B MDQL2 C1251 10uF B MWEB B MDQU5 B MDQU2 R1204 1K 1 B MRASB A MCK B MA4 A MVREFDQ R1201 1K 1 B MA0 B MA5 B M...

Page 30: ...CI_ADDR 0 PCM_WE CI_IORD L1902 BLM18PG121SN1D CI_TS_DATA 3 5V_Normal R1907 100 PCM_A 3 CI_ADDR 7 R1913 10K CI_TS_DATA 1 CI_OE CI_MCLKI PCM_CD CI_MISTRT CI_MDI 4 AR1907 33 CI_CD2 CI_ADDR 5 C1901 0 1uF OPT CI_TS_DATA 2 CI_DATA 0 7 5V_Normal CI_TS_CLK R1928 10K CI_MDI 2 PCM_A 9 R1905 10K R1911 10K PCM_RST PCM_A 13 CI_ADDR 8 CI_MDI 0 CI_MDI 1 GND P1900 10067972 000LF EAG41860102 G1 G2 57 21 52 16 10 4...

Page 31: ...B C R2628 0 C2603 0 1uF 16V OPT 3 3V_TU TU_GND_B C2611 0 1uF 16V IF_N_MSTAR LNB_OUT L2601 BLM18PG121SN1D OPT FE_TS_VAL_ERR R2616 4 7K T2 C S2 RF_SWITCH_CTL R2642 0 R2622 0 R2612 0 OPT R2600 51 3 3V_TU FE_TS_SYNC L2600 BLM18PG121SN1D 3 3V_TU TU_CVBS R2618 470 T2 C S2 R2607 0 OPT C2617 0 1uF 16V OPT R2608 0 T C S2 R2601 10 T C S2 R2609 TU_I2C_NON_FILTER 33 R2605 22 C2627 100uF 16V OPT C2621 100pF 50...

Page 32: ... SP 7850_15 A_GND R2702 2 2K 1W 12V_LNB 12V_LNB D2704 40V LNB_SMAB34 SMAB34 R2704 33 C2712 0 1uF 50V C2714 18pF A_GND 12V_Normal A_GND D2701 D2704 1 40V OPT LNB_SX34 D2705 40V LNB_SMAB34 SMAB34 C2707 0 1uF A_GND C2713 0 22uF 25V R2703 36K 1 16W 1 R2706 0 IC2701 A8303SESTR T 1 VCP 3 NC_1 7 SCL 9 ADD 10 TONECTRL 11 TCAP 12 ISET 13 VREG 14 GND 15 VIN 16 LX 17 GNDLX 18 NC_2 19 NC_3 20 BOOST 5 TDO 8 SD...

Page 33: ...R C2842 47pF 50V OPT SCART_ADC_FILTER AUDIO R2804 470K L2809 CM2012FR10KT OPT SCART_ADC_FILTER_L C2814 0 1uF DTV MNT_R_OUT C2810 47pF 50V OPT COMP_ADC_FILTER AUDIO L2806 CM2012FR10KT OPT COMP_ADC_FILTER_L D2805 20V R2812 10K SC1_CVBS_IN C2830 47pF 50V OPT COMP_ADC_FILTER L2809 1 0 SCART_NON_ADC_FILTER 4 7uF C2815 R2826 470K C2833 47pF 50V OPT SCART_ADC_FILTER C2829 47pF 50V OPT COMP_ADC_FILTER DTV...

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