LG 26LC7C, Service Manual

Page 1: ...R LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LA75C MODEL 26LC7D C 26LC7D C UK website http biz LGservice com Internal Use Only ...

Page 2: ...ht reserved Only for training and service purposes LGE Internal Use Only 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 14 BLOCK DIAGRAM 17 EXPLODED VIEW 18 REPLACEMENT PARTS LIST 20 SVC SHEET ...

Page 3: ...fe 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 metallic parts such as antenna term...

Page 4: ... on 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...

Page 5: ...the 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 replac...

Page 6: ...emp 0 40 deg 2 Humidity 80 10 Storage Environment 1 Temp 20 60 deg 2 Humidity 0 90 1 Application Range This specification sheet is applied to the LCD TV used LA75C chassis 2 Specification Each part is tested as below without special appointment 2 1 Temperature 25 5 C 77 9 F CST 40 5 C 2 2 Relative Humidity 65 10 2 3 Power Voltage Standard input voltage 100 240V 50 60Hz Standard Voltage of each pro...

Page 7: ...le 178 R L U D 6 Color Temperature Standard 8 300 9 300 10 300 Test Signal Cool 10 000 11 000 12 000 HDMI input Warm 5 500 6 500 7 500 Dynamic Cool 85 IRE 6 Component Video Input Y PB PR No Specification Remark Resolution H freq kHz V freq Hz 1 720 480 15 73 59 94 SDTV DVD 480I 2 720 480 15 73 60 00 SDTV DVD 480I 3 720 480 31 47 59 94 SDTV 480P 4 720 480 31 50 60 00 SDTV 480P 5 1280 720 44 96 59 9...

Page 8: ...el clock MHz Remark PC DDC 1 640 480 31 469 59 94 25 17 VESA VGA O 2 800 600 37 879 60 31 40 00 VESA SVGA O 3 1024 768 48 363 60 00 65 00 VESA XGA O 4 1280 768 47 776 59 87 79 50 CVT WXGA O 5 1360 768 47 720 59 799 84 75 CVT WXGA O 6 1366 768 47 13 59 65 72 DTV 1 720 480 31 50 60 27 027 SDTV 480P 2 720 480 31 47 59 94 27 00 SDTV 480P 3 1280 720 45 00 60 00 74 25 HDTV 720P 4 1280 720 44 96 59 94 74...

Page 9: ...n 06CH then process Heat run Or 6 White Pattern condition of Ez Adjust O How to make set white pattern A Press Power ON button of Service Remocon B Press ADJ button of Service remocon to enter Ez Adjust Select 6 WHITE PATTERN and press A key And 100 Full White pattern appear In this status you can maintain Heat Run useless any pattern generator Notice If you maintain one picture over 20 minutes Es...

Page 10: ... ad 00 10 Adjust 480i Comp1 Change the mode and adjustment action kb 00 06 Change to RGB DTV mode No action ad 00 10 Adjust 1080p Comp1 RGB Change the mode and adjustment action ad 00 90 End of the adjustment 3 Adjustment protocol Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Order Command Set response 1 Inter the Adjustment mode ...

Page 11: ...ADJ key of Service remocon After then select 4 ADC 1080p Comp1 RGB with navigator button and press Enter First it is automatically adjustment Component1 3 If adjustment is correctly finished ADC Component1 Success message will be displayed But adjustment is not correctly finished ADC Component1 1080p Fail message will be displayed 4 After adjustment Component1 mode move to RGB DTV mode automatical...

Page 12: ... 01 01 01 01 01 01 01 30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88 40 35 00 C4 8E 21 00 00 1E 0E 1F 00 80 51 00 1E 30 50 40 80 37 00 C4 8E 21 00 00 1C 00 00 00 FD 00 38 60 4B 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 00 09 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 02 03 17 F1 47 84 05 03 02 20 22 10 23 11 07 50 10 66 03 0C 00 20 00 80 01 1D 00 72 51 D0...

Page 13: ...o to full white mode 5 Adjust at three mode Cool Medium Warm When R Gain is fixed at 192 Control G Gain and B Gain by reducing them from 192 When B Gain is fixed at 192 Control R Gain and G Gain by reducing them from 192 When G Gain is fixed to 192 Control R Gain and B Gain by reducing them from 192 Fix one of three Gains R Gain G Gain and B Gain at 192 and control the other two by reducing values...

Page 14: ...t PCB is bad NO After ch eckin g the Power of L ow Pass Filter you should decide to replace Low Pass Filter or not NO After ch eckin g the pattern between pin8 of IC808 and C658 you can suspect th at PCB is bad YES This bo ard has big problem because Main chip BCM3 552 have some trouble s After checking thoro ugh ly all pa th onc e again You should decid e to replace BCM3552 or not Check JP7004 Ca...

Page 15: ...ecide to replace BCM3553 or not 3 Component doesn t display Check JP7032 JP7033 JP7034 Can you see the normal waveform Check the C635 C636 C637 in front of BCM3552 Can you see the normal waveform YES NO JK705 may have problem Replace th is Jack NO After check the pattern be tween input of BCM3552 and JK705 You can suspect that PCB is bad YES This bo ard has big problem because Main chip BCM3 552 h...

Page 16: ...uld check The H V sync and c lock Can you see the normal waveform YES NO NO After checking the trace of TMDS lines and power of PI3HDMI341ART you should decide to replace PI3HDMI341ART or not NO YES This bo ard has big problem because Main chip BCM3 552 have some trouble s After checking thoro ugh ly all pa th onc e again You should decid e to replace BCM3552 or not After checkin g the Power of th...

Page 17: ... 17 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only BLOCK DIAGRAM 74F08D TMDS341A AUDIO L R WXGA 768P Single LVDS Connector ...

Page 18: ...tronics Inc All right reserved Only for training and service purposes LGE Internal Use Only EXPLODED VIEW 300 301 200 801 512 511 510 120 500 501 802 550 803 804 805 521 520 900 402 401 403 910 530 540 400 806 820 821 LV1 A21 A2 ...

Page 19: ...20 EBR39280601 Hand Insert PCB Assembly Sub M I LA75C 26LC7D UK AUSWLHX Chicago WXGA SIDE_AV EBR42617401 Hand Insert PCB Assembly Sub SUB M I LA75C 26LC7D UK AUO CKD 521 MCK32547704 Cover MOLD ABS 32LC4D NF ABS SIDE A V DOMESTIC 530 EAY33030301 SMPS AC DC LGLP2627 HEP 90VTO264V 140W 47 63 UL CSA SEMKO HE AT YY 540 EBU41561001 Main Total Assembly 26LC7D UK BRAND LA75C 550 EBT36230501 Chassis Assemb...

Page 20: ...BF56A C1005X7R104KET 100nF 10 16V X7R 55TO 125 C220 EAE33970001 CS1005X5R105K6R3NR 1uF 10 6 3V X5R 55TO C221 EAE33970001 CS1005X5R105K6R3NR 1uF 10 6 3V X5R 55TO C222 EAE32479401 CH1005CG471J500NR 470pF 5 50V C0G 55TO 1 C223 EAE32479401 CH1005CG471J500NR 470pF 5 50V C0G 55TO 1 C224 0CK103BH56A C1005X7R1E103KT 10nF 10 25V X7R 55TO 12 C227 0CK475CC94A C1608Y5V0J475ZT 4 7uF 20TO 80 6 3V Y5V C228 0CK10...

Page 21: ... 6 3V X5R 55TO C336 EAE32479401 CH1005CG471J500NR 470pF 5 50V C0G 55TO 1 C337 EAE32479401 CH1005CG471J500NR 470pF 5 50V C0G 55TO 1 C338 0CE336WH6D8 MVK6 3TP25VC33M 33uF 20 25V 45MA 40TO 10 C339 0CK106DC67A JMK212JB106MG T 10uF 20 6 3V X5R 55TO 85 C340 0CK104BF56A C1005X7R104KET 100nF 10 16V X7R 55TO 125 C341 0CK103BH56A C1005X7R1E103KT 10nF 10 25V X7R 55TO 12 C342 0CK102BK56A 0402B102K500CT 1nF 10...

Page 22: ...O 125C C523 0CK223CK56A UMK107JB223KA T 22nF 10 50V X7R 55TO 125 C524 0CK223CK56A UMK107JB223KA T 22nF 10 50V X7R 55TO 125 C525 0CK105CD56A C1608X7R1A105KT 1uF 10 10V X7R 55TO 125C C526 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125 C527 0CE337WJ6D8 MVK12 5TP35VC330M 330uF 20 35V 480MA 40T C528 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125 C529 0CK104CK56A 0603B104K500CT 100nF 10 50V ...

Page 23: ... 125 C667 0CK104BF56A C1005X7R104KET 100nF 10 16V X7R 55TO 125 C668 0CK475CC94A C1608Y5V0J475ZT 4 7uF 20TO 80 6 3V Y5V C669 0CK475CC94A C1608Y5V0J475ZT 4 7uF 20TO 80 6 3V Y5V C670 0CK475CC94A C1608Y5V0J475ZT 4 7uF 20TO 80 6 3V Y5V C671 0CK103BH56A C1005X7R1E103KT 10nF 10 25V X7R 55TO 12 C672 0CK103BH56A C1005X7R1E103KT 10nF 10 25V X7R 55TO 12 C673 0CK104BF56A C1005X7R104KET 100nF 10 16V X7R 55TO 1...

Page 24: ...VC100M 100uF 20 16V 110MA 40TO C851 0CE227WF6DC MVK8 0TP16VC220M 220uF 20 16V 80MA 40TO C852 0CK104BF56A C1005X7R104KET 100nF 10 16V X7R 55TO 125 C853 0CK104BF56A C1005X7R104KET 100nF 10 16V X7R 55TO 125 C854 0CE107WF6DC MVK6 3TP16VC100M 100uF 20 16V 110MA 40TO C855 0CN475FH67A TMK325BJ475MN T 4 7uF 20 25V X5R 55TO 85 C856 0CK223BF5CA 0402B223K160CT 22nF 10 16V X7R 55TO 125C C857 0CC561CK41A C1608...

Page 25: ...46 0DZRM00218A UDZS8 2B 8 2V 8 02TO8 36V 30OHM 200MW SOD3 ZD747 0DZRM00218A UDZS8 2B 8 2V 8 02TO8 36V 30OHM 200MW SOD3 ZD748 0DZRM00218A UDZS8 2B 8 2V 8 02TO8 36V 30OHM 200MW SOD3 ZD749 0DZRM00178A UDZS5 1B 5 1V 4 98TO5 2V 80OHM 200MW SOD32 ZD750 0DZRM00178A UDZS5 1B 5 1V 4 98TO5 2V 80OHM 200MW SOD32 ZD751 0DZRM00178A UDZS5 1B 5 1V 4 98TO5 2V 80OHM 200MW SOD32 ZD752 0DZRM00178A UDZS5 1B 5 1V 4 98T...

Page 26: ...TP 8P AR372 EBC37094001 MNR04M0APJ750 75OHM 5 1 16W 4 SMD R TP 8P AR377 EBC37094001 MNR04M0APJ750 75OHM 5 1 16W 4 SMD R TP 8P AR378 EBC37094001 MNR04M0APJ750 75OHM 5 1 16W 4 SMD R TP 8P AR379 EBC37094001 MNR04M0APJ750 75OHM 5 1 16W 4 SMD R TP 8P AR380 EBC37094001 MNR04M0APJ750 75OHM 5 1 16W 4 SMD R TP 8P AR381 EBC37094001 MNR04M0APJ750 75OHM 5 1 16W 4 SMD R TP 8P L717 0RJ0000G676 MCR18EZHJ00 0OHM ...

Page 27: ...4701C678 MCR01MZPJ472 4 7KOHM 5 1 16W 1005 R TP R R241 0RJ1200C678 MCR01MZPJ121 120OHM 5 1 16W 1005 R TP RO R2417 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R2419 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R242 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R2420 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R2421 0RJ1000C678 MCR01MZPJ101 100OHM 5 1 16W 1005 R TP R...

Page 28: ... 47KOHM 5 1 16W 1005 R TP RO R413 0RJ4702C678 MCR01MZPJ473 47KOHM 5 1 16W 1005 R TP RO R414 0RJ0222C678 MCR01MZPJ220 22OHM 5 1 16W 1005 R TP R R415 0RJ0222C678 MCR01MZPJ220 22OHM 5 1 16W 1005 R TP R R416 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R417 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R418 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R419 0RJ0000C678 MCR01MZPJ0...

Page 29: ...10 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R611 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R612 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R613 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R614 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R615 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R616 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP R...

Page 30: ...P RO R770 0RJ1001C678 MCR01MZPJ102 1KOHM 5 1 16W 1005 R TP ROH R771 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R772 0RJ0000C678 MCR01MZPJ000 0OHM 5 1 16W 1005 R TP ROHM R773 0RJ1002D677 MCR03EZPJ103 10KOHM 5 1 10W 1608 R TP RO R774 0RJ1001C678 MCR01MZPJ102 1KOHM 5 1 16W 1005 R TP ROH R775 0RH0682D622 MCR10EZHJ680 68OHM 5 1 8W 2012 R TP ROHM R776 0RJ5601C478 MCR01MZPF5601 5 6KOHM 1 1 16W ...

Page 31: ...ilter Bead HH 1M2012 121JT H 1mm 120OHM L510 6200J00005N Filter Bead HH 1M2012 121JT H 1mm 120OHM L511 6200J00005N Filter Bead HH 1M2012 121JT H 1mm 120OHM L512 6200J00005N Filter Bead HH 1M2012 121JT H 1mm 120OHM L513 6200J00005N Filter Bead HH 1M2012 121JT H 1mm 120OHM L514 6200J00005N Filter Bead HH 1M2012 121JT H 1mm 120OHM L515 6200J00005N Filter Bead HH 1M2012 121JT H 1mm 120OHM L517 6210TCE...

Page 32: ...DIP TR JK702 6612J10031A PPJ209 02 14 0MM 1RX5C STRAIGHT TR 5PORTS_ JK703 6612F00099A PEJ024 01 1P 4P STRAIGHT TR 3 6MM BLACK DI JK704 6612J10043A PPJ200 07 15MM 1RX4C ANGLE BK 3P DONGGUAN P402 6612F00099A PEJ024 01 1P 4P STRAIGHT TR 3 6MM BLACK DI SW101 140 313B KPT 1115AM 1C1P 12VDC 0 05A HORIZONTAL 160 SW102 140 313B KPT 1115AM 1C1P 12VDC 0 05A HORIZONTAL 160 SW103 140 313B KPT 1115AM 1C1P 12VD...

Page 33: ...1 G6 SCL2_3 3V 001 E6 004 E6 005 A5 009 D5 011 AE9 22 R2127 EBI_ADDR19 PCI_CBE3 001 E3 SDA3_3 3V 004 F1 009 B7 4 7K R2143 LCD TP1112 LVDS_TX_OUT_TB0 009 B5 TP1125 0 R2113 S VIDEO1_SW007 C7 TP1088 C118 READY C117 READY 5 0V 4 7K R136 4 7uF 6 3V C102 NAND_PB 001 E1 RGB_SW 007 J3 4 7K R2153 22 R2150 75 READY R187 PCI_REQ2 001 F2 22 R2116 DVO_14 PCI_REQ0 001 J3 22 R112 4 7K R194 2 7K R2147 REV_SEL0 00...

Page 34: ... 1uF 16V C665 HDMI_SEL_1 001 H3 TMDS1_RXC 0 0 6 J 7 1 5M R2624 READY 10V VR607 TP6063 3 6K R685 Tu_CVBS_INCM1 006 AB9 S VIDEO2_L 007 G5 DDC_SCL2 006 X23 KRC102S Q603 E B C 0 R609 DDC_SCL1 006 K8 COMP2_Pb 007 D4 OPT C616 TMDS2_RX0 006 I15 VR608 180 R2672 READY READY R645 COMP1_Y 007 A4 0 1uF 16V C658 1K R667 TMDS1_RX2 006 S28 GND TP6004 2K R692 10V VR605 499 R2639 0 R661 0 R2691 BCM_L_OUT 006 AK16 ...

Page 35: ... 4 7K PDP_FAN R968 GIL G 03 S3T2 PDP_FAN P905 1 2 3 0 R936 LVDS_TX_OUT_TA2 001 C4 100 PDP_FAN R970 22uF 16V PDP_FAN C915 JP906 KIA78R09F IC901 PDP 1 VIN 2 VC 3 VOUT 4 NC 5 GND1 6 GND2 0 R_NON_AI R983 10K PDP_FAN R967 OPT READY R957 1 16W 47K 5 R901 LCD 0 R937 SCL1_5V 001 H2 005 C3 006 Z26 009 F2 GND 0 R945 10K PDP_FAN R977 0 R_USE_AI R935 VBR_B_HD LVDS_TX_OUT_TA1 001 C4 SDA1_5V 001 H2 005 C3 006 Z...

Page 36: ...Oct 2007 Printed in Korea P NO MFL38731308 ...