FUNAI LT850-M26 Service Manual
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FUNAI LT850-M26 Service Manual

26″ color lcd television
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SERVICE MANUAL

This Service Manual is for the LT850-M26 (A0CA0EP) model.
For the LT850-M26 (A0CA0EP) model, the letter (A0CA0EP) is printed on
the Serial Number Label on the back of the unit. Refer to the Serial
Number Label below.
Serial No. Label
"A0CA0EP"
26" COLOR LCD TELEVISION
LT850-M26

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Summary of Contents for FUNAI LT850-M26

  • Page 1: Service Manual

    SERVICE MANUAL This Service Manual is for the LT850-M26 (A0CA0EP) model. For the LT850-M26 (A0CA0EP) model, the letter (A0CA0EP) is printed on the Serial Number Label on the back of the unit. Refer to the Serial Number Label below. Serial No. Label "A0CA0EP"...

  • Page 2: Table Of Contents

    26″ COLOR LCD TELEVISION LT850-M26 TABLE OF CONTENTS Specifications ................1-1 Important Safety Precautions.

  • Page 3: Specifications

    SPECIFICATIONS < TUNER > VHS/UHF Input ----------- 75Ω unbal., IEC Connector Center IF ------------------- SECAM-L 38.9MHz, SECAM-L’ 33.9MHz Description Condition Unit Nominal Limit 1. Video S/N 2. Audio S/N 40/40 < LCD PANEL > Description Condition Unit Nominal Limit Horizontal pixels 1366 1.

  • Page 4: Specifications

    < AUDIO > All items are measured across 16 Ω load at speaker output terminal. Description Condition Unit Nominal Limit 1. Audio Output Power 10% THD: Lch/Rch 4.5/4.5 4.0/4.0 2. Audio Distortion 500mW: Lch/Rch 1.5/1.5 3.0/3.0 -6dB: Lch 70 to 10 k 3.

  • Page 5: Important Safety Precautions

    IMPORTANT SAFETY PRECAUTIONS Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
  • Page 6 4. Hot Chassis Warning - 7. Product Safety Notice - Some electrical and mechanical parts have special safety-related a. Some TV receiver chassis are electrically characteristics which are often not evident from connected directly to one conductor of the AC visual inspection, nor can the protection they give power cord and maybe safety-serviced without necessarily be obtained by replacing them with...
  • Page 7 Precautions during Servicing A. Parts identified by the ! symbol are critical for safety. Replace only with part number specified. B. In addition to safety, other parts and assemblies are specified for conformance with regulations applying to spurious radiation. These must also be replaced only with specified replacements.
  • Page 8 Safety Check after Servicing Examine the area surrounding the repaired location Chassis or Secondary Conductor for damage or deterioration. Observe that screws, parts and wires have been returned to original posi- tions. Afterwards, perform the following tests and con- Primary Circuit firm the specified values in order to verify compliance with safety standards.

  • Page 9: Standard Notes For Servicing

    STANDARD NOTES FOR SERVICING Circuit Board Indications How to Remove / Install Flat Pack-IC 1. The output pin of the 3 pin Regulator ICs is 1. Removal indicated as shown. With Hot-Air Flat Pack-IC Desoldering Machine: 1. Prepare the hot-air flat pack-IC desoldering Top View Bottom View machine, then apply hot air to the Flat Pack-IC...
  • Page 10 With Soldering Iron: With Iron Wire: 1. Using desoldering braid, remove the solder from 1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, flux which is applied to all pins of the flat pack-IC, you can remove it easily.
  • Page 11 2. Installation Instructions for Handling Semi- 1. Using desoldering braid, remove the solder from conductors the foil of each pin of the flat pack-IC on the CBA Electrostatic breakdown of the semi-conductors may so you can install a replacement flat pack-IC more occur due to a potential difference caused by easily.

  • Page 12: Cabinet Disassembly Instructions

    CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart Removal Step/ Remove/*Unhook/ This flowchart indicates the disassembly steps for the Loc. Part Fig. Unlock/Release/ cabinet parts, and the CBA in order to gain access to Note Unplug/Unclamp/ item(s) to be serviced. When reassembling, follow the Desolder steps in reverse order.
  • Page 13 (S-2) (S-2) (S-2) (S-4) (S-2) (S-3) [2] Rear Cabinet (S-2) (S-2) [1] Stand Assembly (S-1) Fig. D1 A0CA0DC...
  • Page 14 [15] Front Cabinet [7] Digital Main CBA Unit [6] Jack Holder (S-8) (S-16) Shield Box (S-9) (S-9) (H-1) [13] Speaker (S-16) (S-10) Speaker Holder(R) (S-17) (S-9) [14] Function [13] Speaker Speaker Holder(L) (S-6) [12] LCD Module Assembly [4] Tuner Shield (S-7) (S-7) [5] Power Supply...
  • Page 15 TV Cable Wiring Diagram To LCD Module Assembly To LCD Module Assembly Inverter CBA CN3901 CN406 CN402 CN3701 CL900B CN407 CN1201 CN403 CN3703 CN3702 CN404 Power Supply CBA CN1202 CN3704 CN401 CN801 Digital Main CN601 CBA Unit CN101 CN202 CN1203 CN802 Power SW CBA To Speaker...

  • Page 16: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: “CBA” is abbreviation for How to set up the service mode: “Circuit Board Assembly.” Service mode: Note: Electrical adjustments are required after 1. Turn the power on. replacing circuit components and certain mechanical parts. It is important to perform 2.

  • Page 17: Vcom Adjustment

    1. Purity Check Mode 2. VCOM Adjustment This mode cycles through full-screen displays of red, Test Point Adj. Point green, blue, and white to check for non-active pixels. 1. Enter the Service mode. Screen buttons 2. Each time pressing [7] button on the remote M.

  • Page 18: White Balance Adjustment

    The White Balance Adjustment should be 5. [CUTOFF] Press [1] button to select “COR” for Red Cutoff performed when replacing the LCD Panel adjustment. Press [3] button to select “COB” for or Digital Main CBA. Blue Cutoff adjustment. [DRIVE] 3. White Balance Adjustment Press [4] button to select “DR”...

  • Page 19: How To Initialize The Lcd Television

    HOW TO INITIALIZE THE LCD TELEVISION How to initialize the LCD television: 1. Turn the power on. 2. Enter the service mode. (Refer to page 5-1.) - To cancel the service mode, press [ ] button on the remote control unit. 3.

  • Page 20: Firmware Renewal Mode

    FIRMWARE RENEWAL MODE Equipment Required [Update procedure] 1. Plug in the AC power cord. a. USB storage device 2. Press [ ] button on the remote control unit to turn b. Remote Control Unit off (standby). 3. Check “STAND BY” indicator (Red LED) lighting. Firmware Update Procedure 4.

  • Page 21: Troubleshooting

    TROUBLESHOOTING FLOW CHART NO.1 The power cannot be turned on. See FLOW CHART No.2 <The fuse blows out.> Is the fuse (F701) normal? Check if there is any leak or short-circuiting on the primary circuit component, and service it if defective. (C610, D609, D610, D611, D612, Q621, Q622, T601, T602) Is the INV+31V line voltage normal?
  • Page 22 FLOW CHART NO.5 AL+3.3V is not output. Is approximately 7V voltage supplied to the collector Check D525, C516 and their periphery circuit, and of Q521? service it if defective. Is approximately 4V voltage supplied to the base Check D552 and their periphery circuit, and of Q521? service it if defective.
  • Page 23 FLOW CHART NO.9 LCD-5.5V is not output. Replace Q509. FLOW CHART NO.10 AL+5.5V is not output. Check if there is any leak or short-circuit on the loaded circuit, and service it if defective. FLOW CHART NO.11 P-ON+3.3V is not output. Replace Q510.
  • Page 24 FLOW CHART NO.13 AL+5.5V is not output. Check if there is any leak or short-circuit on the loaded circuit, and service it if defective. FLOW CHART NO.14 P-ON+3.3V is not output. Replace Q510. FLOW CHART NO.15 P-ON+9V is not output. Is approximately 10V voltage supplied to the base of Q517? Replace Q517.
  • Page 25 FLOW CHART NO.17 Picture does not appear normally. Check the line between Pin(16, 18) of CN403 and Are the DIF signals outputted to Pin(16, 18) of CN403? Pin(4, 5) of TU1, and TU1(Tuner Unit), and service it if defective. Replace Digital Main CBA Unit or LCD Module Assembly.

  • Page 26: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A0CA0BLS...
  • Page 27 Video Block Diagram A0CA0BLV...
  • Page 28 Audio Block Diagram A0CA0BLA...
  • Page 29 Digital Signal Process Block Diagram A0CA0BLD...
  • Page 30 Inverter Block Diagram A0CA0BLINV...
  • Page 31 Power Supply Block Diagram A0CA0BLP...

  • Page 32: Schematic Diagrams / Cba And Test Points

    SCHEMATIC DIAGRAMS / CBA AND TEST POINTS Standard Notes WARNING Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc.
  • Page 33 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE. 2. CAUTION: Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F701) is blown, first check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply.
  • Page 34 Power Supply 1 Schematic Diagram NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal. 10-3 A0CA0SCP1...
  • Page 35 Power Supply 2 Schematic Diagram 10-4 A0CA0SCP2...
  • Page 36 Power Supply 3 Schematic Diagram 10-5 A0CA0SCP3...
  • Page 37 Inverter Schematic Diagram 10-6 A0CA0INV...
  • Page 38 Power SW Schematic Diagram CAUTION ! CAUTION ! NOTE: Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using For continued protection against fire hazard, If Main Fuse (F701) is blown , check to see that all components in the power supply replace only with the same type fuse.
  • Page 39 Function Schematic Diagram 10-8 A0CA0SCF...
  • Page 40 Digital Main 1 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-9 A0CA0SCD1...
  • Page 41 Digital Main 2 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-10 A0CA0SCD2...
  • Page 42 Digital Main 3 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-11 A0CA0SCD3...
  • Page 43 Digital Main 4 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-12 A0CA0SCD4...
  • Page 44 Digital Main 5 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-13 A0CA0SCD5...
  • Page 45 Digital Main 6 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-14 A0CA0SCD6...
  • Page 46 Digital Main 7 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-15 A0CA0SCD7...
  • Page 47 Power Supply CBA Top View Because a hot chassis ground is present in the power supply NOTE: circuit, an isolation transformer must be used when repairing. The voltage for parts in hot circuit is measured using Also, in order to have the ability to increase the input slowly, hot GND as a common terminal.
  • Page 48 Power Supply CBA Bottom View Because a hot chassis ground is present in the power supply NOTE: circuit, an isolation transformer must be used when repairing. The voltage for parts in hot circuit is measured using Also, in order to have the ability to increase the input slowly, hot GND as a common terminal.
  • Page 49 Inverter CBA, Function CBA & Power SW CBA Top View Because a hot chassis ground is present in the power supply CAUTION ! CAUTION ! circuit, an isolation transformer must be used when repairing. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. For continued protection against fire hazard, Also, in order to have the ability to increase the input slowly, If Main Fuse (F701) is blown , check to see that all components in the power supply...
  • Page 50 Inverter CBA, Function CBA & Power SW CBA Bottom View Because a hot chassis ground is present in the power supply CAUTION ! CAUTION ! circuit, an isolation transformer must be used when repairing. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. For continued protection against fire hazard, Also, in order to have the ability to increase the input slowly, If Main Fuse (F701) is blown , check to see that all components in the power supply...

  • Page 51: Waveforms

    WAVEFORMS WF1 ~ WF6 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: PAL Color Bar Signal (with 1kHz Audio Signal) Pin 2 of CN404 Pin 4 of CN404 VIDEO-Y VIDEO-Y 0.2V 0.2V 20µs 20µs VIDEO VIDEO 0.2V...
  • Page 52 WF7 ~ WF10 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: PAL Color Bar Signal (with 1kHz Audio Signal) Pin 22 of CN401 Pin 26 of CN404 WF10 AUDIO(L) AUDIO(L) 0.5V 0.5V 0.5m 0.5ms VIDEO-R VIDEO-R 0.5V...

  • Page 53: Wiring Diagram

    WIRING DIAGRAMS A0CA0WI 12-1...

  • Page 54: Exploded View

    EXPLODED VIEWS Cabinet Digital Main CBA Unit CL402 CL403 CL404 CL802 CL401 CL3901 CL406 SP802 CL801 Function CBA LCD1 SP801 Power Supply CBA Power SW CBA Inverter CBA Stand Assembly See Electrical Parts List for parts with this mark. 13-1 A0CA0CEX...
  • Page 55 Packing X2-1 X2-2 Some Ref. Numbers are not in sequence. Tape Stand Assembly Packing Tape Tape Packing Tape 13-2 A0CA0PEX...

  • Page 56: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. ! have special characteristics important to safety. RATING LABEL A0CA0EP ---------- Before replacing any of these components, read SCREW P-TIGHT M4X14 BIND HEAD+BLK GBHP4140 carefully the product safety notice in this service SCREW P-TIGHT 3X10 BIND HEAD+ GBHP3100 manual.

  • Page 57: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. have special characteristics important to safety. C213 CHIP CERAMIC CAP .(1608) CH J 100pF/50V or CHD1JJ3CH101 Before replacing any of these components, read CAP CHIP 1608 J/C0G/100pF/50V CHD101EYA030 carefully the product safety notice in this service C214...
  • Page 58 Ref. No. Description Part No. Ref. No. Description Part No. C411 CHIP CERAMIC CAP .(1608) CH J 1000pF/50V CHD1JJ3CH102 C522 ELECTROLYTIC CAP . 1000µF/25V M or CE1EMZPDL102 ELECTROLYTIC CAP . 1000µF/25V M or CE1EMZNDL102 CAP CHIP 1608 J/C0G/0.001µF/50V CHD102EYA030 CAP ELE 1000µF/25V/M/85 or CED102KSN002 C415 ELECTROLYTIC CAP .
  • Page 59 Ref. No. Description Part No. Ref. No. Description Part No. CAP CHIP 1608 K/X7R/0.047µF/50V CHD473EYA032 CAP CHIP 1608 K/X7R/0.001µF/50V CHD102EYA032 C803 CHIP CERAMIC CAP .(1608) B K 0.22µF/16V or CHD1CK30B224 C841 CHIP CERAMIC CAP .(1608) B K 1000pF/50V or CHD1JK30B102 CAP CHIP 1608 K/X5R/0.22µF/16V CHD224EYA045 CAP CHIP 1608 K/X7R/0.001µF/50V...
  • Page 60 Ref. No. Description Part No. Ref. No. Description Part No. D211 WIRE COPPER 6111-06003-0120 or XZ40C0SHG002 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 WIRE COPPER JP0.6MM XZ40C0AKM001 DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F D213 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D504 DIODE FR154 or NDLZ000FR154 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 DIODE FR154BD...
  • Page 61 Ref. No. Description Part No. Ref. No. Description Part No. DIODE ZENER HZS4.7NB2TE-EQ QDTB0HZS4R7N DIODE ZENER HZS18NB2TE-EQ QDTBHZS18NB2 D539 SCHOTTKY BARRIER DIODE SB390 NDWZ000SB390 D805 DIODE ZENER 18BSB-T26 or NDTB018BST26 D541 DIODE ZENER 3V3BSB-T26 or NDTB3R3BST26 DIODE ZENER HZS18NB2TE-EQ QDTBHZS18NB2 DIODE ZENER HZS3.3NB2TE-EQ QDTB0HZS3R3N D806...
  • Page 62 Ref. No. Description Part No. Ref. No. Description Part No. PNP TRANSISTOR 2SA1980MG-AT NQSG2SA1980M NPN TRANSISTOR 2SC5343G-AT or NQSG02SC5343 Q183 TRANSISTOR KTC3198-Y -AT/P or NQSYKTC3198P NPN TRANSISTOR 2SC5343MG-AT or NQSG2SC5343M TRANSISTOR KTC3199-GR-AT/P or NQS4KTC3199P NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P Q506 TRANSISTOR KTC3198-Y-AT/P or...
  • Page 63 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 100 Ω or NPN TRANSISTOR 2SC5343MG-AT or NQSG2SC5343M RRXAJR5Z0101 RES CHIP 1608 1/10W J 100 Ω NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M RRXA101YF002 RES CARBON FILM 1/4W J 1.2k Ω or Q516 TRANSISTOR KTC3198-Y -AT/P or NQSYKTC3198P...
  • Page 64 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 15k Ω RES CHIP 1608 1/10W J 10k Ω RRXA153YF002 RRXA103YF002 CHIP RES. 1/10W J 47k Ω or CHIP RES. 1/10W J 1.5k Ω or R308 RRXAJR5Z0473 R404...
  • Page 65 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 10k Ω or RES CARBON FILM 1/4W J 10k Ω or R521 RRXAJR5Z0103 R553 RCX4103FS002 RES CHIP 1608 1/10W J 10k Ω RES CARBON FILM T 1/4W J 10k Ω or RRXA103YF002 RCX4103T1001 RES CARBON FILM 1/4W J 3.3k Ω...
  • Page 66 Ref. No. Description Part No. Ref. No. Description Part No. RES CARBON FILM 1/4W J 470 Ω or CHIP RES. 1/4W J 1M Ω R598 RCX4471FS002 RRX4JR7Z0105 RES CARBON FILM T 1/4W J 470 Ω or RES CHIP 3216 1/4W J 1.0M Ω or RCX4471T1001 R661 RRX4105HH034...
  • Page 67 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W 0 Ω or WIRE COPPER JP0.6MM XZ40C0AKM001 JS300 RRXAZR5Z0000 RES CHIP 1608 1/10W J 0 Ω BC603 WIRE COPPER 6111-06003-0120 or XZ40C0SHG002 RRXA000YF002 CHIP RES.(1608) 1/10W 0 Ω or WIRE COPPER JP0.6MM XZ40C0AKM001 JS302...
  • Page 68 Ref. No. Description Part No. Ref. No. Description Part No. C1103 CHIP CERAMIC CAP .(1608) B K 0.047µF/50V or CHD1JK30B473 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 CAP CHIP 1608 K/X7R/0.047µF/50V CHD473EYA032 DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F C1106 CHIP CERAMIC CAP .(1608) CH J 1800pF/50V CHD1JJ3CH182 D1103 DIODE ZENER 5V6BSB-T26 or...
  • Page 69 Ref. No. Description Part No. Ref. No. Description Part No. D1222 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 TRANSISTOR KTA-1266-GR-AT/P or NQS4KTA1266P DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 TRANSISTOR 2SA1015-Y(TE2 F T) or QQSY2SA1015F DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F TRANSISTOR 2SA1015-GR(TE2 F T) or QQS12SA1015F D1223 SWITCHING DIODE 1SS133(T-77) or...
  • Page 70 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 1.0M Ω CHIP RES. 1/10W J 27k Ω or RRXA105YF002 R1216 RRXAJR5Z0273 CHIP RES. 1/10W J 1M Ω or RES CHIP 1608 1/10W J 27k Ω R1034 RRXAJR5Z0105 RRXA273YF002...
  • Page 71 Ref. No. Description Part No. Ref. No. Description Part No. RES CARBON FILM T 1/4W G 4.7k Ω or R109 RCX4472T1002 CN701 WIRE ASSEMBLY 2PIN 2PIN 85MM AWG18 R WX1A0CA0-203 RES CARBON FILM 1/4W G 4.7k Ω RCG472PAK001 COILS CHIP RES. 1/10W F 1.1k Ω or R111 RRXAFR5H1101 L250...
  • Page 72 LT850-M26 A0CA0EP 2010-06-15...

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