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SERVICE MANUAL

This Service Manual is for the
LH850-M19 (A0CN2EP) / LH851-M19 (A0CN3EP) model.
For the LH850-M19 (A0CN2EP) / LH851-M19 (A0CN3EP) model, the letter
(A0CN2EP) / (A0CN3EP) is printed on the Serial Number Label on the back
of the unit. Refer to the Serial Number Label below.

Serial No. Label

Serial No. Label

"A0CN2EP"

"A0CN3EP"

19

″

COLOR LCD TELEVISION

LH850-M19

LH851-M19

1
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3
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Содержание LH850-M19

Страница 1: ...EP model For the LH850 M19 A0CN2EP LH851 M19 A0CN3EP model the letter A0CN2EP A0CN3EP is printed on the Serial Number Label on the back of the unit Refer to the Serial Number Label below Serial No Lab...

Страница 2: ...ze the LCD Television 6 1 Firmware Renewal Mode 7 1 Troubleshooting 8 1 Block Diagrams 9 1 Schematic Diagrams CBA and Test Points 10 1 Waveforms 11 1 Wiring Diagram 12 1 Exploded View 13 1 Mechanical...

Страница 3: ...nit Nominal Limit 1 RECEIVED FREQ RANGE 60dBm 45ch 1 2 kHz kHz 1000 900 500 167 2 INPUT DYNAMIC RANGE mix max c 1 VHF HIGH 8ch UHF 45ch dBuV dBuV 25 101 25 101 28 98 29 98 d 2 VHF HIGH 8ch UHF 45ch dB...

Страница 4: ...ghtly below these specifications Limit specifications represent the absolute worst condition that still might be considered acceptable In no case should a unit fail to meet limit specifications Descri...

Страница 5: ...terminal screw and if applicable to the coaxial connector If the measured resistance is less than 1 0 megohm or greater than 5 2 megohm an abnormality exists that must be corrected before the instrum...

Страница 6: ...near thermally hot parts be sure that leads and components do not touch thermally hot parts c the AC supply d high voltage and e antenna wiring Always inspect in all areas for pinched out of place or...

Страница 7: ...PVC tubing 3 Spacers 4 Insulators for transistors E When replacing AC primary side components transformers power cord etc wrap ends of wires securely about the terminals before soldering F Observe tha...

Страница 8: ...and externally exposed accessible parts RF terminals an tenna terminals video and audio input and output ter minals microphone jacks earphone jacks etc Measuring Method Power ON Insert load Z between...

Страница 9: ...the flat pack IC is fixed with glue to the CBA when removing entire flat pack IC first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 4 Relea...

Страница 10: ...ins of the flat pack IC you can remove it easily Fig S 1 3 2 Affix the wire to a workbench or solid mounting point as shown in Fig S 1 5 3 While heating the pins using a fine tip soldering iron or hot...

Страница 11: ...occur due to a potential difference caused by electrostatic charge during unpacking or repair work 1 Ground for Human Body Be sure to wear a grounding band 1 M that is properly grounded to remove any...

Страница 12: ...ase Unplug or Desolder e g 2 S 2 two Screws S 2 2 L 2 two Locking Tabs L 2 5 Refer to the following Reference Notes in the Table Step Loc No Part Removal Fig No Remove Unhook Unlock Release Unplug Unc...

Страница 13: ...4 2 A0CN2DC 2 Rear Cabinet 1 Stand Assembly S 3 S 2 S 2 S 2 S 2 S 2 S 4 S 4 S 1 Fig D1...

Страница 14: ...BA 8 Stand Holder 7 Digital Main CBA Unit 9 LCD Module Assembly 10 Speaker 10 Speaker 11 Function CBA 12 Front Cabinet S 8 S 10 S 10 S 6 S 6 S 6 S 12 S 11 S 5 S 8 S 13 S 13 S 9 H 1 Speaker Holder Spea...

Страница 15: ...ain CBA CN1001 CN301 Digital Main CBA Unit CN801 CN152 AC CORD CN3704 CN3401 CN3702 CN3703 CN3701 CN3901 CN302 CN303 CN404 CN401 CN802 CN1002 Function CBA CN101B To Speaker To LCD Module Assembly To L...

Страница 16: ...stments unless the proper equipment is available Test Equipment Required 1 NTSC Pattern Generator Color Bar W White Window Red Color Dot Pattern Gray Scale Monoscope Multi Burst 2 Remote control unit...

Страница 17: ...he LCD Panel surface 3 Enter the Service mode 4 To enter the VCOM 2 adjustment mode press 3 button on the remote control unit To enter the VCOM 1 adjustment mode press 2 button on the remote control u...

Страница 18: ...de 5 CUTOFF Press 1 button to select COR for Red Cutoff adjustment Press 3 button to select COB for Blue Cutoff adjustment DRIVE Press 4 button to select DR for Red Drive adjustment Press 6 button to...

Страница 19: ...the service mode Refer to page 5 1 To cancel the service mode press button on the remote control unit 3 Press button on the remote control unit to initialize the LCD television 4 INITIALIZED will app...

Страница 20: ...h digit of the file name indicate the size of TV If the size of your TV and the file name were not the same you must change the file name Update procedure 1 Plug in the AC power cord 2 Press button on...

Страница 21: ...d service it if defective Check the presence that the primary component is leaking or shorted and service it if defective Check the presence that the rectifying diode or circuit is shorted in each rec...

Страница 22: ...05 Check D634 and their periphery circuit and service it if defective Replace Q605 Is approximately 7 5V voltage supplied to the collector of Q616 Replace Q616 No AL 33V is not outputted FLOW CHART NO...

Страница 23: ...11V voltage supplied to the anode of D613 Is approximately 10V voltage supplied to the base of Q611 Yes Is approximately 14V voltage supplied to the base of Q615 No Check D664 and their periphery circ...

Страница 24: ...ervice it if defective No P ON 11V is not output FLOW CHART NO 14 Yes No Is approximately 15V voltage supplied to the collector of Q609 Is approximately 12V voltage supplied to the base of Q609 No Yes...

Страница 25: ...signal line and service it if defective Check the composite video signal line and service it if defective Check the component video Y Pb Pr signal line and service it if defective Check the line betw...

Страница 26: ...is not outputted normally Audio input terminals FLOW CHART NO 21 Check the line between Pin 16 18 of CN303 and Pin 4 5 of TU10 and TU10 Tuner Unit and service it if defective Are the DIF signals outpu...

Страница 27: ...ON H2 AK8 REMOTE AK1 P ON H1 PROTECT1 P ON H2 P ON H1 AH2 KEY IN1 6 6 CN152 CN303 CN3703 AH27 BACKLIGHT ADJ IC3102 SERIAL FLASH MEMORY CLOCK DATA IN D11 B10 6 5 E23 TUNER CLK TUNER DATA CN303 CN3703...

Страница 28: ...COM VIDEO Pb IN 6 6 COM VIDEO Pr IN 8 8 VIDEO OUT 15 BUFFER Q10 TU CVBS 29 29 S SW 1 1 TU CVBS TU10 DIF OUT2 4 DIF OUT1 5 TUNER UNIT IF AGC 6 CN303 CN3703 DIF OUT2 16 16 IF AGC 20 20 DIF OUT1 18 18 V...

Страница 29: ...RAM DIGITAL MAIN CBA UNIT SIF OUT TU10 TUNER UNIT 14 7 1 6 2 SIF 26 26 HEADPHONE L 3 3 HEADPHONE R 4 4 HEADPHONE DET 2 2 CN3703 CN303 AMP L OUT 10 10 AMP R OUT 8 8 AUDIO MUTE 12 12 TO SYSTEM CONTROL B...

Страница 30: ...TMDS D0 TMDS D1 TMDS D1 TMDS D2 TMDS D2 TMDS CLOCK TMDS CLOCK SDA SCL F2 F1 G2 G1 H2 H1 E2 E1 AG10 AJ8 B1 B2 C1 C2 D1 D2 A1 A2 AF10 AE11 TMDS CLOCK TMDS CLOCK DEMODULATOR MPEG DECODER DEMODU ADC DAC A...

Страница 31: ...Q1014 Q1005 Q1004 Q1006 Q1008 Q1012 Q1002 Q1011 Q1023 Q1024 DRIVE Q1010 Q1017 Q1018 DRIVE OSC PWM CONTROL LOGIC VCC DTC CURRENT CONTROL SWITCH Q1009 OVER VOLTAGE PROTECTOR Q1015 OVER VOLTAGE PROTECTOR...

Страница 32: ...y circuit to fail HOT COLD MAIN CBA HOT CIRCUIT BE CAREFUL Q602 SWITCHING CONTROL 1 4 3 2 IC605 T601 5 LINE FILTER L601 AC601 AC CORD BRIDGE RECTIFIER D602 D604 D605 D607 3 4 19 18 17 16 15 14 13 12 7...

Страница 33: ...itute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock fire or other hazards Notes 1 Do not use the part number shown on these drawing...

Страница 34: ...ed 2 To maintain original function and reliability of repaired units use only original replacement parts which are listed with their part numbers in the parts list section of the service manual 4 Volt...

Страница 35: ...table power supply circuit is used in this unit If Main Fuse F601 is blown check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power...

Страница 36: ...10 4 A0CN2SCM2 Main 2 Schematic Diagram...

Страница 37: ...10 5 A0CN2SCM3 Main 3 Schematic Diagram...

Страница 38: ...10 6 A0CN2SCM4 Main 4 Schematic Diagram...

Страница 39: ...10 7 A0CN2SCF Function Schematic Diagram...

Страница 40: ...Main 1 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic D...

Страница 41: ...Main 2 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic D...

Страница 42: ...l Main 3 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 43: ...l Main 4 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 44: ...l Main 5 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 45: ...l Main 6 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 46: ...l Main 7 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 47: ...5V BL SW P ON 3 3V P ON H1 BL ADJ PON 11V PROTECT 3 PROTECT 1 PROTECT 1 PROTECT 3 GND P ON H2 P ON 5V C1005 Q1001 Q1007 Q1016 Q1017 Q1018 R1001 R1002 R1006 C1031 J236 J237 R1010 J238 J239 J240 D1020 J...

Страница 48: ...08 D610 Q601 BC601 PCB STUD R601 C601 SA601 SW601 J1026 J1027 J1019 J1020 C821 R602 FH602 C605 D604 D605 D607 L601 C611 HOT J319 J1023 J320 J321 JK412 J322 J323 J324 R1100 R1101 R1102 R1103 R1108 J331...

Страница 49: ...tic Diagram S VIDEO Y S VIDEO Y 0 2V 0 2V 20 20 s S VIDEO C S VIDEO C 0 2V 0 2V 20 20 s VIDEO Y VIDEO Y 0 2V 0 2V 20 20 s 20 20 s VIDEO Pr VIDEO Pr 0 2V 0 2V 20 20 s VIDEO Pb VIDEO Pb 0 2V 0 2V 20 20...

Страница 50: ...Pin 26 of CN404 AUDIO L AUDIO L 0 5V 0 5V 0 5m 0 5ms WF7 Pin 22 of CN401 20 20 s VIDEO G VIDEO G 0 5V 0 5V 20 20 s VIDEO R VIDEO R 0 5V 0 5V 20 20 s Input PAL Color Bar Signal with 1kHz Audio Signal W...

Страница 51: ...23 21 20 25 21 23 17 19 24 22 20 18 16 12 14 8 10 15 13 11 9 7 3 5 6 22 RESET 24 2 P ON H2 25 1 P ON H1 P ON 11V GND GND GND AL 3 3V P ON 3 3V GND GND P ON 3 3V GND P ON 3 3V P ON 3 3V GND AL 3 5V AL...

Страница 52: ...BA Unit AC601 Function CBA Main CBA Stand Assembly L17 B13 B12 B12 B21 L9 L1 L1 L1 L1 L3 L1 L1 L5 A4 B3 L3 B18 A16 L19 L3 B1 L3 L3 B9 L11 L19 L3 B3 L2 L2 L3 L3 L8 L1 L8 B8 B8 A5 A1 A3 L3 L1 L9 L2 L5 S...

Страница 53: ...13 2 A0CN0PEX Packing S4 S5 S3 Tape Packing Tape Packing Tape Packing Tape S6 L17 X1 Some Ref Numbers are not in sequence Stand Assembly X3 X4 FRONT FRONT X2 1 X2 2 S2 S1 Tape...

Страница 54: ...Y 29PIN FFC 29PIN 50MM WX1A94F0 101 CL401 WIRE ASSEMBLY 29PIN FFC 29PIN 50MM WX1A94F0 101 CL404 WIRE ASSEMBLY 29PIN FFC 29PIN 50MM WX1A94F0 101 CL801 WIRE ASSEMBLY 2PIN WX1A93N0 001 WX1A93N0 001 CL802...

Страница 55: ...02 CAP CHIP 1608 J C0G 0 001 F 50V CHD102EYA030 C154 CHIP CERAMIC CAP 1608 F Z 0 1 F 25V CHD1EZ30F104 C155 CHIP CERAMIC CAP 1608 F Z 0 1 F 50V or CHD1JZ30F104 CAP CHIP 1608 Z Y5V 0 1 F 50V CHD104EYA03...

Страница 56: ...18 CAPPOLYESTER FILM0 0047 F 100V J or CA2A472SER02 POLYESTER FILM CAP 0 0047 F 100V J CMB472EUR001 Ref No Mark Description Part No C609 POLYESTER FILM CAP PB FREE 0 039 F 100V J or CA2A393DT018 CAP P...

Страница 57: ...22 F 100V J or CA2A223SER02 Ref No Mark Description Part No CAP POLYESTER FILM 0 022 F 100V J PCMT CTA223PKR003 C1003 CHIP CERAMIC CAP 1608 B K 0 01 F 50V or CHD1JK30B103 CAP CHIP 1608 K X7R 0 01 F 50...

Страница 58: ...1 29P JC1129JSH001 Ref No Mark Description Part No CN404 FFC CONNECTOR IMSA 9615S 29A PP A or JC96J29ER007 CONNECTOR PRINT MES 00 6232 029 006 800 or JC62G29UG026 CONNECTOR PRINT MES 29 S 1 0 11 29P J...

Страница 59: ...ENER 4V7BSB T26 or NDTB4R7BST26 Ref No Mark Description Part No DIODE ZENER HZS4 7NB2TE EQ QDTB0HZS4R7N D629 DIODE ZENER 9V1BSB T26 or NDTB9R1BST26 DIODE ZENER HZS9 1NB2TE EQ QDTB0HZS9R1N D631 SWITCHI...

Страница 60: ...TCHING 1N4148 F0021 NDTZ01N4148F D1018 WIRE CP STP S 0 50 or XZ40F0REN001 WIRE CP STP S 0 60 or XZ40F0REN002 WIRE CP 6113 05603 0220 or XZ40F0SHG001 WIRE CP CP0 56 XZ40F0XRC001 D1020 DIODE ZENER 5V1BS...

Страница 61: ...F T or QQS12SC1815F NPN TRANSISTOR 2SC5343Y AT or NQSY02SC5343 Ref No Mark Description Part No NPN TRANSISTOR 2SC5343G AT or NQSG02SC5343 NPN TRANSISTOR 2SC5343MG AT or NQSG2SC5343M NPN TRANSISTOR 2S...

Страница 62: ...SC5343Y AT or NQSY02SC5343 NPN TRANSISTOR 2SC5343G AT or NQSG02SC5343 Ref No Mark Description Part No NPN TRANSISTOR 2SC5343MG AT or NQSG2SC5343M NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M Q1004 TRANSISTO...

Страница 63: ...ISTOR 2SC5343Y AT or NQSY02SC5343 NPN TRANSISTOR 2SC5343G AT or NQSG02SC5343 NPN TRANSISTOR 2SC5343MG AT or NQSG2SC5343M NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M Q1024 TRANSISTOR KTA1267 GR AT P or NQS1...

Страница 64: ...STP S 0 50 or XZ40F0REN001 WIRE CP STP S 0 60 or XZ40F0REN002 Ref No Mark Description Part No WIRE CP 6113 05603 0220 or XZ40F0SHG001 WIRE CP CP0 56 XZ40F0XRC001 R433 WIRE CP STP S 0 50 or XZ40F0REN00...

Страница 65: ...f No Mark Description Part No RES CHIP 3216 1 4W J 680k or RRX4684YF004 CHIP RES 1 4W J 680k RRX4JR7Z0684 R610 RES CARBON FILM T 1 4W J 390 or RCX4391T1001 RES CARBON FILM 1 4W J 390 RCX4391FS002 R611...

Страница 66: ...CHIP RES 1608 1 10W F 3 3k or RRXAFR5Z3301 RES CHIP 1608 1 10W F 3 30k RTW3301YF002 Ref No Mark Description Part No R680 RES CARBON FILM T 1 4W J 2 7k or RCX4272T1001 RES CARBON FILM 1 4W J 2 7k RCX42...

Страница 67: ...90 or RRXAJR5Z0391 RES CHIP 1608 1 10W J 390 or RRXA391YF002 RES CHIP 1608 1 10W J 390 RRJ391WAL002 Ref No Mark Description Part No R1020 CHIP RES 1 10W J 1k or RRXAJR5Z0102 RES CHIP 1608 1 10W J 1 0k...

Страница 68: ...RRJ104WAL002 R1086 CHIP RES 1 10W F 100k or RRXAFR5H1003 CHIP RES 1 10W F 100k or RRXAFR5Z1003 Ref No Mark Description Part No RES CHIP 1608 1 10W F 100k RTW1003YF002 R1087 CHIP RES 1 10W F 68k or RRX...

Страница 69: ...01 RCA 101H OR or JXRJ010YUQ06 JACK RCA PCB S ORANGE 01 MTJ 032 04B 76 FE or JXRJ010LY029 JACK RCA PCB S ORANGE 01 RCA 101HF OR JXRJ01YUQ012 Ref No Mark Description Part No JK411 JACK RCA PCB S WHITE...

Страница 70: ...101 TACT SWITCH SKHHLMA010 or SST0101AL049 TACT SWITCH KSMC632A SST0101HH025 SW102 TACT SWITCH SKHHLMA010 or SST0101AL049 TACT SWITCH KSMC632A SST0101HH025 SW103 TACT SWITCH SKHHLMA010 or SST0101AL049...

Страница 71: ...LH850 M19 LH851 M19 A0CN2EP A0CN3EP 2010 09 15...

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