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SERVICE MANUAL

This Service Manual is for the
LH8-M26BB (A03A0EP) / LT8-M26BB (A03A1EP) model.
For the LH8-M26BB (A03A0EP) / LT8-M26BB (A03A1EP) model, the letter
(A03A0EP) / (A03A1EP) 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

"A03A0EP"

"A03A1EP"

26

″

COLOR LCD TELEVISION

LH8-M26BB / LT8-M26BB

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Содержание LH8-M26BB

Страница 1: ...EP model For the LH8 M26BB A03A0EP LT8 M26BB A03A1EP model the letter A03A0EP A03A1EP 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: ...ow to Initialize the LCD Television 6 1 Troubleshooting 7 1 Block Diagrams 8 1 Schematic Diagrams CBA and Test Points 9 1 Waveforms 10 1 Wiring Diagram 11 1 Exploded View 12 1 Mechanical Parts List 13...

Страница 3: ...ription Condition Unit 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 H...

Страница 4: ...htly 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 Descrip...

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: ...No Part Removal Fig No Remove Unhook Unlock Release Unplug Unclamp Desolder Note 1 Stand Assembly D1 4 S 1 2 Rear Cabinet D1 11 S 2 3 S 3 S 4 3 Jack Holder HP D2 S 5 4 Jack CBA D2 D6 2 S 6 CL202B 5 I...

Страница 13: ...4 2 A03A0DC 2 Rear Cabinet 1 Stand Assembly S 3 S 4 S 2 S 2 S 2 S 1 Fig D1...

Страница 14: ...S 5 3 Jack Holder HP 4 Jack CBA S 7 S 7 5 Inverter Power CBA Fig D2 S 10 6 Tuner Shield 8 Jack Holder 7 Power Supply CBA 10 Digital Main CBA Unit S 9 S 9 S 8 H 1 S 9 S 11 S 11 S 11 S 11 S 12 9 Shield...

Страница 15: ...PCB Holder 12 Stand Holder Fig D4 S 16 S 15 S 15 Hook S 17 S 18 S 18 S 18 17 LCD Module Assembly 15 Junction CBA 16 Function CBA 13 Speaker Holder R 13 Speaker Holder L 14 Speaker 18 Front Cabinet Hoo...

Страница 16: ...ker To LCD Module Assembly CN453 CN610 CN101 CN801 AC CORD CL202B CN802 CL201A CN401 CN403 CN404 CN402 CN3903 CN3701 CN3702 CN3703 CN3704 CN105 CL104A CL104B CN1952 CN1951 CN1900 Power Supply CBA Jack...

Страница 17: ...remote control unit as shown in Fig 1 How to set up the service mode Service mode 1 Use the service remote control unit 2 Turn the power on 3 Press the service button on the service remote control un...

Страница 18: ...screen Upon completion OK appears on the screen 5 To cancel or to exit from the Auto Calibration Component press BACK button 3 Auto Calibration PC Purpose To bring the color adjustment of PC into stan...

Страница 19: ...e Press button on the service remote control unit and select C D mode 5 CUTOFF Press 3 button to select COB for Blue Cutoff adjustment Press 1 button to select COR for Red Cutoff adjustment DRIVE Pres...

Страница 20: ...ce button on the service remote control unit Refer to page 5 1 To cancel the service mode Press button on the remote control unit 3 Press button on the service remote control unit to initialize the LC...

Страница 21: ...g circuit of the secondary circuit and 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 di...

Страница 22: ...CHART NO 6 Yes No Is approximately 6V voltage supplied to the collector of Q521 Check D525 D527 D528 C516 and their periphery circuit and service it if defective Check D525 C516 and their periphery c...

Страница 23: ...their periphery circuit and service it if defective Check D539 C522 and their periphery circuit and service it if defective Check Q508 Q520 D541 D542 P ON H2 line and their periphery circuit and servi...

Страница 24: ...GB input Are the video signals outputted to the specific terminal Check the luminance signal line and service it if defective Check the chrominance signal line and service it if defective Check the RG...

Страница 25: ...tputted normally Audio input terminals FLOW CHART NO 17 Check the line between Pin 16 18 of CN403 and Pin 4 5 of TU1 and TU1 Tuner Unit and service it if defective Are the DIF signals outputted to Pin...

Страница 26: ...REMOTE AD11 P ON H1 PROTECT1 P ON H2 P ON H1 AC11 JUNCTION CBA CN105 KEY IN1 6 6 CN453 CN101 CN403 Q181 CN3703 D16 BACKLIGHT ADJ IC3101 MEMORY SCL SDA AE4 AF3 6 5 IC3802 AUDIO SELECTOR SCL SDA 27 28...

Страница 27: ...DEO Y IN 8 8 COM VIDEO Pb IN 6 6 COM VIDEO Pr IN 4 4 VIDEO OUT 15 BUFFER Q011 TU CVBS 29 29 SCART OUT SEL 6 6 IC1 INPUT SELECT SW CTL 15 10 1 2 TU CVBS TU1 DIF OUT2 4 DIF OUT1 5 TUNER UNIT IF AGC 6 CN...

Страница 28: ...1 3 RGB AUDIO L OUT2 RGB AUDIO R OUT2 6 RGB AUDIO L IN2 2 RGB AUDIO R IN2 POWER SUPPLY CBA JACK CBA TO DIGITALSIGNAL PROCESS BLOCK DIAGRAM TO DIGITALSIGNAL PROCESS BLOCK DIAGRAM DIGITAL MAIN CBA UNIT...

Страница 29: ...D0 TMDS D0 TMDS D1 TMDS D1 TMDS D2 TMDS D2 TMDS CLOCK TMDS CLOCK SDA SCL TMDS D0 TMDS D0 TMDS D1 TMDS D1 TMDS D2 TMDS D2 TMDS CLOCK TMDS CLOCK SDA SCL AF16 AE16 AF17 AE17 AF18 AE18 AF15 AE15 AB16 AC1...

Страница 30: ...N453 T1950 10 11 14 15 2 3 4 5 7 8 Q1973 Q1971 IC1930 1 4 3 2 1 4 3 2 IC1931 Q1931 TO POWER SUPPLY BLOCK DIAGRAM CN610 HOT COLD HOT CIRCUIT BE CAREFUL Q1972 SWITCHING Q1930 CN1900 Q1932 ACL 2 HOT GND...

Страница 31: ...5V AL 3 3V P ON 3 3V P ON 5V DIGITAL MAIN CBA UNIT P ON 3 3V 13 14 P ON 9V 6 15 16 LCD 12V 15 16 AL 3 3V 10 24 26 19 21 AL 5V 24 26 AL 3 3V 1 19 21 P ON 5V 27 29 4 2 3 15 9 13 12 14 11 10 16 8 6 7 8 I...

Страница 32: ...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 33: ...d 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 Volta...

Страница 34: ...lectable 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 po...

Страница 35: ...9 4 A03A0SCP2 Power Supply 2 Schematic Diagram...

Страница 36: ...9 5 A03A0SCP3 Power Supply 3 Jack Schematic Diagram Comparison Chart of Models and Marks Model Mark LH8 M26BB A B LT8 M26BB...

Страница 37: ...9 6 A03A0SCINP Inverter Power Schematic Diagram NOTE The voltage for parts in hot circuit is measured using hot GND as a common terminal...

Страница 38: ...9 7 A03A0SCIRF Function Junction Schematic Diagram...

Страница 39: ...of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 6 IC3301 6 6 in this Digital Main Schematic Diagram Section 1 NOTE Comparison Cha...

Страница 40: ...of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 6 IC3301 6 6 in this Digital Main Schematic Diagram Section 1 NOTE Comparison Cha...

Страница 41: ...of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 6 IC3301 6 6 in this Digital Main Schematic Diagram Section 1 NOTE Comparison Cha...

Страница 42: ...9 11 A03A0SCD4 Digital Main 4 Schematic Diagram...

Страница 43: ...of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 6 IC3301 6 6 in this Digital Main Schematic Diagram Section 1 NOTE Comparison Cha...

Страница 44: ...of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 6 IC3301 6 6 in this Digital Main Schematic Diagram Section 1 NOTE Comparison Cha...

Страница 45: ...of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into six and shown as IC3301 1 6 IC3301 6 6 in this Digital Main Schematic Diagram Section 1 NOTE Comparison Cha...

Страница 46: ...leshooting this type of power supply circuit a variable isolation transformer is required CAUTION Fixed voltage or Auto voltage selectable power supply circuit is used in this unit If Main Fuse F601 i...

Страница 47: ...an isolation transformer must be used when repairing Also in order to have the ability to increase the input slowly when troubleshooting this type of power supply circuit a variable isolation transfor...

Страница 48: ...on terminal Because a hot chassis ground is present in the power supply circuit an isolation transformer must be used when repairing Also in order to have the ability to increase the input slowly when...

Страница 49: ...hot circuit is measured using hot GND as a common terminal Because a hot chassis ground is present in the power supply circuit an isolation transformer must be used when repairing Also in order to hav...

Страница 50: ...observed at Waveform check points Shown in Schematic Diagram S VIDEO Y 0 2V 20 s S VIDEO C 0 2V 20 s VIDEO Y 0 2V 20 s 20 s VIDEO Pr 0 2V 20 s VIDEO Pb 0 2V 20 s Pin 6 of CN404 WF5 VIDEO 0 2V 20 s WF...

Страница 51: ...n 28 of CN404 WF10 Pin 26 of CN404 AUDIO L 0 5V 0 5ms WF7 Pin 22 of CN401 20 s VIDEO G 0 5V 20 s VIDEO R 0 5V 20 s Input PAL Color Bar Signal with 1kHz Audio Signal WF7 WF10 Waveforms to be observed a...

Страница 52: ...SET 24 2 P ON H2 25 1 P ON H1 P ON 9V GND GND GND AL 3 3V P ON 3 3V GND GND P ON 3 3V GND LCD 12V LCD 12V GND AL 3 3V 1 AL 3 3V 1 AL 3 3V 1 GND GND GND 26 AL 5V 27 P ON 5V 28 P ON 5V 29 25 24 26 27 28...

Страница 53: ...er Power CBA AC601 B6 Function CBA Jack CBA CL801 CL802 SP802 SP801 Power Supply CBA A3 L6 L6 L8 Stand Assembly L6 L6 L6 L6 L6 L6 L9 L6 L6 L10 L7 L3 L3 B9 B 11 S6 L4 L4 L2 L2 LCD 1 CL3903 B7 B19 L5 A4...

Страница 54: ...12 2 A03A0PEX Packing S5 S3 S1 Tape Tape Packing Tape Packing Tape Packing Tape S2 S2 S7 X1 Some Ref Numbers are not in sequence L7 S6 Stand Assembly X4 X3 FRONT FRONT X2...

Страница 55: ...SSEMBLY 2PIN 2PIN 150MM AWG24 BLA WX1A03A0 203 CL1952 WIRE ASSEMBLY 14PIN 14PIN 110MM AWG24 RE WX1A03A0 201 CL3903 WIRE ASSEMBLY 51 30PIN LVDS AWG30 BLACK WHITE BL WX1A03A0 401 L2 SCREW P TIGHT 3X10 B...

Страница 56: ...CHD1AK30B105 C181 CHIP CERAMIC CAP 1608 CH J 100pF 50V CHD1JJ3CH101 C182 CHIP CERAMIC CAP 1608 F Z 0 1 F 50V CHD1JZ30F104 C204 CHIP CERAMIC CAP CH J 330pF 50V CHD1JJ3CH331 C205 CHIP CERAMIC CAP CH J 3...

Страница 57: ...37 C621 CERAMIC CAP 470pF 2KV or CA3D471PAN04 CERAMIC CAP RB 470pF 2KV or CA3D471TE006 CERAMIC CAP BL 470pF 2KV CA3D471XF003 C623 ELECTROLYTIC CAP 10 F 50V M CE1JMASDL100 Ref No Mark Description Part...

Страница 58: ...F0021 NDTZ01N4148F D504 SCHOTTKY BARRIER DIODE SB390 NDWZ000SB390 D505 DIODE ZENER 18BSB T26 NDTB018BST26 D508 DIODE ZENER 8V2BSA T26 NDTA8R2BST26 D511 SCHOTTKY BARRIER DIODE SB340 NDWZ000SB340 D514...

Страница 59: ...tion Part No L602A LINE FILTER MS036 or LLBG00ZY2009 LINE FILTER JLB2808 LLBG00ZXB004 L801 COIL SEALED POWER INDUCTORS LHL10NB680K or LLARKGQTU680 COIL SEALED POWER INDUCTORS CWKBNP 680K or LLF6800KV0...

Страница 60: ...TOR KTC3198 Y AT P or NQSYKTC3198P TRANSISTOR KTC3199 GR AT P or NQS4KTC3199P TRANSISTOR KTC3198 GR AT P or NQS4KTC3198P Ref No Mark Description Part No TRANSISTOR 2SC1815 Y TE2 F T or QQSY2SC1815F TR...

Страница 61: ...J 47k or RRXAJR5Z0473 RES CHIP 1608 1 10W J 47k RRXA473YF002 R228 CHIP RES 1 10W J 15k or RRXAJR5Z0153 Ref No Mark Description Part No RES CHIP 1608 1 10W J 15k RRXA153YF002 R229 CHIP RES 1 10W J 47k...

Страница 62: ...1 4W J 270 or RCX4271FS002 RES CARBON FILM T 1 4W J 270 RCX4271T1001 Ref No Mark Description Part No R548 RES CARBON FILM 1 4W J 1k or RCX4102FS002 RES CARBON FILM T 1 4W J 1 0k RCX4102T1001 R549 RES...

Страница 63: ...RRXA000YF002 MISCELLANEOUS AC601 AC CORD W O A GND WIRE CEE 1760MM NO BLACK or WAE1720LW001 AC CORD W O A GND WIRE CEE 1760MM NO BLACK WAE172ZHN001 B9 HEAT SINK PMR ASSEMBLY A8CN0FP 1EM425837A Ref No...

Страница 64: ...FILM 0 056 F 100V J or CA2A563SER02 CAP POLYESTER FILM 0 056 F 100V J PCMT or CTA563PKR003 POLYESTER FILM CAP 0 056 F 100V J CMB563EUR001 C1934 POLYESTER FILM CAP PB FREE 0 0015 F 100V J or CA2A152DT0...

Страница 65: ...2 RES CARBON FILM 1 4W J 820k RCX4824FS002 R1943 RES CARBON FILM 1 4W J 820k RCX4824FS002 R1944 RES CARBON FILM 1 4W J 820k RCX4824FS002 R1945 RES CARBON FILM 1 4W J 820k RCX4824FS002 R1949 RES CARBON...

Страница 66: ...049 TACT SWITCH KSMC632A SST0101HH025 SW104 TACT SWITCH SKHHLMA010 or SST0101AL049 TACT SWITCH KSMC632A SST0101HH025 SW105 TACT SWITCH SKHHLMA010 or SST0101AL049 TACT SWITCH KSMC632A SST0101HH025 SW10...

Страница 67: ...LH8 M26BB LT8 M26BB A03A0EP A1EP 2009 12 18...

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