FUNAI LT850-M19 Service Manual
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FUNAI LT850-M19 Service Manual

19 color lcd television
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SERVICE MANUAL

This Service Manual is for the
LT850-M19 (A0CN0EP) / LT851-M19 (A0CN1EP) model.
For the LT850-M19 (A0CN0EP) / LT851-M19 (A0CN1EP) model, the letter
(A0CN0EP) / (A0CN1EP) is printed on the Serial Number Label on the back
of the unit. Refer to the Serial Number Label below.
Serial No. Label
19 COLOR LCD TELEVISION
LT850-M19
LT851-M19
"A0CN0EP"
Serial No. Label
"A0CN1EP"

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Summary of Contents for FUNAI LT850-M19

  • Page 1: Service Manual

    SERVICE MANUAL This Service Manual is for the LT850-M19 (A0CN0EP) / LT851-M19 (A0CN1EP) model. For the LT850-M19 (A0CN0EP) / LT851-M19 (A0CN1EP) model, the letter (A0CN0EP) / (A0CN1EP) is printed on the Serial Number Label on the back of the unit. Refer to the Serial Number Label below. Serial No.

  • Page 2: Table Of Contents

    19″ COLOR LCD TELEVISION LT850-M19 / LT851-M19 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 3.0/3.0 2.0/2.0 2. Audio Distortion 500mW: Lch/Rch 1.5/1.5 3.0/3.0 -6dB: Lch 70 to 8 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: Instructions For Handling Semi- Conductors

    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-4) (S-2) (S-2) (S-4) [2] Rear Cabinet (S-2) (S-2) (S-3) [1] Stand Assembly (S-1) Fig. D1 A0CN0DC...
  • Page 14 [13] Front Cabinet [6] Shield Box (S-10) [5] Jack Holder [11] Junction (S-7) (S-8) (S-10) [10] Speaker (H-1) Speaker Holder (S-9) (S-13) (S-14) [12] Function CBA (S-8) [7] Digital Main [10] Speaker (S-13) CBA Unit (S-5) Speaker Holder [4] Main CBA [3] Tuner Shield (S-6) [9] LCD Module...
  • Page 15 TV Cable Wiring Diagram To LCD Module Assembly To LCD Module Assembly Main CBA CN3901 CN301 CN302 CN3701 CN1001 CN303 CN3703 CN3702 CN404 CN3401 CN1002 CN401 CN3704 Digital Main CN802 CBA Unit CN801 CORD CN152 To Speaker To Speaker CN101 Junction CBA CN101A Function CBA...

  • 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 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 (F601) normal? Check if there is any leak or short-circuiting on the primary circuit component, and service it if defective. (IC605, Q601, Q602, D602, D604, D605, D607, T601, R602) Is the AL+33V line voltage normal?
  • Page 22 FLOW CHART NO.5 AL+3.3V is not output. Is approximately 5V voltage supplied to the collector Check D637, C628 and their periphery circuit, and of Q605? service it if defective. Is approximately 4V voltage supplied to the base Check D634 and their periphery circuit, and of Q605? service it if defective.
  • Page 23 FLOW CHART NO.9 PANEL+24V is not output. Is approximately 32V voltage supplied to the cathode of D619? Is approximately 32V voltage outputted to the collector of Q612? Check D617, D636 and their periphery circuit, and service it if defective. FLOW CHART NO.10 PANEL+13V is not output.
  • Page 24 FLOW CHART NO.12 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.13 P-ON+3.3V is not output. Replace Q606. FLOW CHART NO.14 P-ON+11V is not output. Is approximately 12V voltage supplied to the base of Q609? Replace Q609.
  • Page 25 FLOW CHART NO.16 The key operation is not functioning. Re-install the switches (SW101-SW106) correctly or replace the poor switch. Check the switches (SW101-SW106) and their periphery, and service it if defective. Replace Digital Main CBA Unit. FLOW CHART NO.17 No operation is possible from the remote control unit. Check AL+3.3V line and service it if defective.
  • Page 26 FLOW CHART NO.19 Picture does not appear normally. Check the line between Pin(16, 18) of CN303 and Are the DIF signals outputted to Pin(16, 18) of CN303? Pin(4, 5) of TU10, and TU10(Tuner Unit), and service it if defective. Replace Digital Main CBA Unit or LCD Module Assembly.

  • Page 27: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A0CN0BLS...
  • Page 28 Video Block Diagram A0CN0BLV...
  • Page 29 Audio Block Diagram A0CN0BLA...
  • Page 30 Digital Signal Process Block Diagram A0CN0BLD...
  • Page 31 Inverter Block Diagram A0CN0BLINV...
  • Page 32 Power Supply Block Diagram A0CN0BLP...

  • Page 33: 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 34 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 (F601) 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 35 Main 1 Schematic Diagram CAUTION ! NOTE: CAUTION ! 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 (F601) is blown , check to see that all components in the power supply hot GND as a common terminal.
  • Page 36 Main 2 Schematic Diagram 10-4 A0CN0SCM2...
  • Page 37 Main 3 Schematic Diagram 10-5 A0CN0SCM3...
  • Page 38 Main 4 Schematic Diagram 10-6 A0CN0SCM4...
  • Page 39 Function & Junction Schematic Diagram 10-7 A0CN0SCF...
  • 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. 10-8 A0CN0SCD1...
  • 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. 10-9 A0CN0SCD2...
  • 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. 10-10 A0CN0SCD3...
  • 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. 10-11 A0CN0SCD4...
  • 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. 10-12 A0CN0SCD5...
  • 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. 10-13 A0CN0SCD6...
  • 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. 10-14 A0CN0SCD7...
  • Page 47 Main CBA, Function CBA & Junction CBA Top View Because a hot chassis ground is present in the power supply NOTE: CAUTION ! circuit, an isolation transformer must be used when repairing. The voltage for parts in hot circuit is measured using Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
  • Page 48 Main CBA, Function CBA & Junction CBA Bottom View Because a hot chassis ground is present in the power supply NOTE: CAUTION ! circuit, an isolation transformer must be used when repairing. The voltage for parts in hot circuit is measured using Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.

  • Page 49: 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 20µs VIDEO-Y VIDEO-Y 0.2V 0.2V 20µs VIDEO VIDEO 0.2V...
  • Page 50 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 51: Wiring Diagram

    WIRING DIAGRAMS A0CN0WI 12-1...

  • Page 52: Exploded View

    EXPLODED VIEWS Cabinet Digital Main CBA Unit CL302 X3301 CL303 CL404 CL3901 CL301 Junction CBA SP802 CL401 CL802 SP801 CL801 Function CBA LCD1 See Electrical Parts List for parts with this mark. Main CBA AC601 Stand Assembly 13-1 A0CN0CEX...
  • Page 53 Packing X2-1 X2-2 Stand Tape Assembly Tape Packing Tape Packing Tape Some Ref. Numbers are not in sequence. Packing Tape 13-2 A0CN0PEX...

  • Page 54: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Mark Description Part No. ! have special characteristics important to safety. ACCESSORIES Before replacing any of these components, read REMOTE CONTROL NH201RD NH201RD carefully the product safety notice in this service REMOCON UNIT NH203RD NH203RD manual.

  • Page 55: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Mark Description Part No. ! have special characteristics important to safety. CAP CHIP 1608 J/C0G/100pF/50V CHD101EYA030 Before replacing any of these components, read CHIP CERAMIC CAP . CH J 15pF/50V or CHD1JJ3CH150 carefully the product safety notice in this service CAP CHIP 1608 J/C0G/15pF/50V...
  • Page 56 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. C429 CHIP CERAMIC CAP .(1608) CH J 33pF/ CHD1JJ3CH330 POLYESTER FILM CAP . 0.039µF/100V J CMB393EUR001 50V or C611! SAFTY CAP . 3300pF/250V or CCN2EMA0E332 CAP CHIP 1608 J/C0G/33pF/50V CHD330EYA030 SAFTY CAP .
  • Page 57 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CAP ELE 100µF/10V/M/85 H7 CEB101KSN003 C1004 CHIP CERAMIC CAP .(1608) B K 0.01µF/ CHD1JK30B103 50V or C643 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1JZ30F104 50V or CAP CHIP 1608 K/X7R/0.01µF/50V CHD103EYA032 CAP CHIP 1608 Z/Y5V/0.1µF/50V CHD104EYA036...
  • Page 58 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CAP CHIP 1608 K/X7R/0.1µF/50V CHD104EYA032 CN1001 CONNECTOR PRINT OSU KW05-120- J30502KET001 02-00 C1039 CHIP CERAMIC CAP .(1608) B K 0.01µF/ CHD1JK30B103 50V or CN1002 CONNECTOR PRINT OSU KW05-120- J30502KET001 02-00 CAP CHIP 1608 K/X7R/0.01µF/50V...
  • Page 59 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. D604! DIODE 1N5399BE NDL1001N5399 D635 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D605! DIODE 1N5399BE NDL1001N5399 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 D606 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148...
  • Page 60 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. D1001 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D1026 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F D1002 SWITCHING DIODE 1SS133(T-77) or...
  • Page 61 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. Q301 TRANSISTOR KTC3198-Y-AT/P or NQSYKTC3198P NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M TRANSISTOR KTC3199-GR-AT/P or NQS4KTC3199P Q608 TRANSISTOR KTC3198-Y-AT/P or NQSYKTC3198P TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P TRANSISTOR KTC3199-GR-AT/P or NQS4KTC3199P TRANSISTOR 2SC1815-Y(TE2 F T) or QQSY2SC1815F TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P...
  • Page 62 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. TRANSISTOR(PB FREE) KTC2026-Y/P NQEYKTC2026P TRANSISTOR 2SA1015-Y(TE2 F T) or QQSY2SA1015F TRANSISTOR 2SA1015-GR(TE2 F T) or QQS12SA1015F NPN TRANSISTOR STC403 NQEZ00STC403 PNP TRANSISTOR 2SA1980Y-AT or NQSY02SA1980 Q617 TRANSISTOR KTA1267-GR-AT/P or NQS1KTA1267P PNP TRANSISTOR 2SA1980 G or NQSG02SA1980...
  • Page 63 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CARBON FILM T 1/4W J 1.8k Ω or TRANSISTOR KTC3199-GR-AT/P or NQS4KTC3199P RCX4182T1001 RES CARBON FILM 1/4W J 1.8k Ω TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P RCX4182FS002 CHIP RES. 1/10W J 100 Ω or TRANSISTOR 2SC1815-Y(TE2 F T) or QQSY2SC1815F RRXAJR5Z0101...
  • Page 64 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CHIP 1608 1/10W J 0 Ω RES CARBON FILM T 1/4W J 15k Ω or RRXA000YF002 R455 RCX4153T1001 RES CARBON FILM 1/4W J 15k Ω R421 WIRE CP STP-S-0.50 or XZ40F0REN001 RCX4153FS002 RES CARBON FILM T 1/4W J 15k Ω...
  • Page 65 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/4W J 680k Ω RES CHIP 1608 1/10W J 4.7k Ω RRX4JR7Z0684 RRXA472YF002 RES CARBON FILM T 1/4W J 390 Ω or CHIP RES. 1/10W J 100k Ω or R610 RCX4391T1001 R650...
  • Page 66 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CARBON FILM 1/4W J 22 Ω RES CHIP 1608 1/10W J 10k Ω RCX4220FS002 RRXA103YF002 RES CARBON FILM T 1/4W J 470 Ω or CHIP RES. 1/10W J 22k Ω or R686 RCX4471T1001 R1005...
  • Page 67 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W F 1.0k Ω or CHIP RES. 1/10W F 1M Ω or R1041 RRXAFR5H1001 R1083 RRXAFR5H1004 CHIP RES. 1/10W F 1k Ω or CHIP RES. 1/10W F 1M Ω or RRXAFR5Z1001 RRXAFR5Z1004 RES CHIP 1608 1/10W F 1.00k Ω...
  • Page 68 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W J 33k Ω or R1122 RRXAJR5Z0333 JK413 JACK RGB PCB S 01/RGB-11HS JXGJ21YUQ001 RES CHIP 1608 1/10W J 33k Ω CHIP RES.(1608) 1/10W 0 Ω or RRXA333YF002 JS611 RRXAZR5Z0000...
  • Page 69 Ref. No. Mark Description Part No. RES CHIP 1608 1/10W J 330 Ω RRXA331YF002 SWITCHES SW101 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 TACT SWITCH KSMC632A SST0101HH025...
  • Page 70 LT850-M19/LT851-M19 A0CN0EP/A0CN1EP 2010-05-25...

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