FUNAI A8C70EP Service Manual
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FUNAI A8C70EP Service Manual

22″ color lcd television
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SERVICE MANUAL
This Service Manual is for the
Serial No. Label
LT6-M22BB(A8C70EP)
/LT6-M22WB(A8C71EP) model.
 
 
 
For the LT6-M22BB(A8C70EP)
"A8C70EP"
/LT6-M22WB(A8C71EP) model,
the letter (A8C70EP)/(A8C71EP) is
Serial No. Label
printed on the Serial No. Label.
Refer to the Serial No. Label on the
 
 
 
right.
"A8C71EP"
22" COLOR LCD TELEVISION
LT6-M22BB/LT6-M22WB

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Summary of Contents for FUNAI A8C70EP

  • Page 1 Serial No. Label LT6-M22BB(A8C70EP) /LT6-M22WB(A8C71EP) model.       For the LT6-M22BB(A8C70EP) "A8C70EP" /LT6-M22WB(A8C71EP) model, the letter (A8C70EP)/(A8C71EP) is Serial No. Label printed on the Serial No. Label. Refer to the Serial No. Label on the       right. "A8C71EP"...

  • Page 2: Table Of Contents

    22″ COLOR LCD TELEVISION LT6-M22BB/LT6-M22WB 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 1680 1.
  • Page 4 < AUDIO > All items are measured across 8 Ω load at speaker output terminal. Description Condition Unit Nominal Limit 1. Audio Output Power 10% THD: Lch/Rch 1.0/1.0 0.8/0.8 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 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/ This flowchart indicates the disassembly steps for the Remove/*Unhook/ 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 [3] Rear Cabinet (S-4) (S-3) (S-4) (S-4) (S-3) [4] Stand Hinge (S-4) (S-3) (S-2) (S-4) (S-4) (S-1) [2] Neck Cover [1] Stand Cover Fig. D1 A8C70DC...
  • Page 14 (S-9) (S-10) [7] Digital Main [17] Front Cabinet (S-9) CBA Unit Connector IC Card OSU [6] Shield Box (S-8) [16] Speaker (S-6) Speaker [15] LCD Module (S-7) (S-8) Holders Assembly (S-5) [5] Jack CBA [16] Speaker (S-11) (S-17) [8] FFC (S-17) (S-14) Speaker...
  • Page 15 TV Cable Wiring Diagram To LCD Module Assembly Inverter CBA CN401 Junction Jack CBA CL404 CN404B CN11 To LCD Module Assembly CN402 CN404A Digital Main CBA Unit CN4501 CN4502 CN403 CN451 CN3601 CN3701 CN4503 CN3704 To Speaker Main CBA CN106 CN104A CN101A CN102A...

  • 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. Use the service remote control unit. 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. Screen 1. Enter the Service mode. buttons 2. Each time pressing [7] button on the service M.
  • Page 18 The following adjustment normally are not attempted in 5. [CUTOFF] the field. Only when replacing the LCD Panel then adjust Press [3] button to select “COB” for Blue Cutoff as a preparation. adjustment. Press [1] button to select “COR” for Red Cutoff adjustment.

  • 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. To enter the service mode, press the service button on the service remote control unit. (Refer to page 5-1.) - To cancel the service mode, Press [ ] button on the remote control unit.

  • Page 20: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A8C70BLS...
  • Page 21 Video Block Diagram A8C70BLV...
  • Page 22 Audio-1 Block Diagram A8C70BLA1...
  • Page 23 Audio-2 Block Diagram A8C70BLA2...
  • Page 24 Digital Signal Process Block Diagram A8C70BLD...
  • Page 25 Inverter Block Diagram A8C70BLINV...
  • Page 26 Power Supply Block Diagram A8C70BLP...

  • Page 27: Schematic Diagrams / Cba's And Test Points

    SCHEMATIC DIAGRAMS / CBA’S 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 28 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 29 Main 1/3 Schematic Diagram A8C70SCM1...
  • Page 30 Main 2/3, Jack Schematic Diagram A8C70SCM2...
  • Page 31 Main 3/3 Schematic Diagram CAUTION ! CAUTION ! NOTE: Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. For continued protection against fire hazard, The voltage for parts in hot circuit is measured using If Main Fuse (F601) is blown , check to see that all components in the power supply replace only with the same type fuse.
  • Page 32 Inverter & Junction Schematic Diagram A8C70SCINV...
  • Page 33 Function Schematic Diagram A8C70SCF...
  • Page 34 IR Sensor Schematic Diagram A8C70SCIR...
  • Page 35 Digital Main 1/6 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC4513. IC4513 is divided into seven and shown as IC4513 (1/5) ~ IC4513 (4/5) in this Digital Main Schematic Diagram Section. A8C70SCD1...
  • Page 36 Digital Main 2/6 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC4513. IC4513 is divided into seven and shown as IC4513 (1/5) ~ IC4513 (4/5) in this Digital Main Schematic Diagram Section. 8-10 A8C70SCD2...
  • Page 37 Digital Main 3/6 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC4513. IC4513 is divided into seven and shown as IC4513 (1/5) ~ IC4513 (4/5) in this Digital Main Schematic Diagram Section. 8-11 A8C70SCD3...
  • Page 38 Digital Main 4/6 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC4513. IC4513 is divided into seven and shown as IC4513 (1/5) ~ IC4513 (4/5) in this Digital Main Schematic Diagram Section. 8-12 A8C70SCD4...
  • Page 39 Digital Main 5/6 Schematic Diagram 8-13 A8C70SCD5...
  • Page 40 Digital Main 6/6 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC4513. IC4513 is divided into seven and shown as IC4513 (1/5) ~ IC4513 (4/5) in this Digital Main Schematic Diagram Section. 8-14 A8C70SCD6...
  • Page 41 Main CBA Top View CAUTION ! Because a hot chassis ground is present in the power CAUTION ! supply circut, an isolation transformer must be used. For continued protection against fire hazard, Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. Also, in order to have the ability to increase the input replace only with the same type fuse.
  • Page 42 Main CBA Bottom View Because a hot chassis ground is present in the power CAUTION ! CAUTION ! supply circut, an isolation transformer must be used. For continued protection against fire hazard, Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. Also, in order to have the ability to increase the input replace only with the same type fuse.
  • Page 43 Inverter CBA Top View 8-17 BA8A70F01021-1...
  • Page 44 Inverter CBA Bottom View 8-18 BA8A70F01021-1...
  • Page 45 Function CBA Top View IR Sensor CBA Top View IR Sensor CBA Bottom View Function CBA Bottom View BA8C70F01012-2 BA8C70F01012-3 8-19...
  • Page 46 Jack CBA Top View Junction CBA Top & Bottom View BA8A70F01021 Jack CBA Bottom View BA8C70F01012-4 8-20...

  • Page 47: Waveforms

    WAVEFORMS WF1 ~ WF7 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: PAL Color Bar Signal (with 1kHz Audio Signal) Pin 14 of IC801 Pin 1 of CN102A Pin 5 of CN102A VIDEO 0.2V 20µs AUDIO 0.1V...

  • Page 48: Wiring Diagram

    WIRING DIAGRAMS A8C70WI 10-1...

  • Page 49: Exploded View

    EXPLODED VIEWS Cabinet Digital Main CBA Unit CN3802 CL3704 CL4503 CL3601 CL3701 CL107 CL4502 Jack CBA CL802 CL4501 SP802 SP451 Function CBA CL451 LCD1 Main CBA IR Sensor CBA Junction CBA Inverter CBA See Electrical Parts List for parts with this mark. AC601 11-1 A8C70CEX...
  • Page 50 Packing X2-1, X2-2, X2-3, Some Ref. Numbers are Owners Manual(AR), not in sequence. Owners Manual(BG), Owners Manual(EN), Owners Manual(RU), Owners Manual(UA) Packing Tape Packing Tape Tape Packing Tape Packing Tape Packing Tape 11-2 A8C70PEX...

  • Page 51: Mechanical Parts List

    CARTON A8C71EP 1EM427439 SHIELD BOX A8CN0FP 1EM122473 STYROFOAM TOP A8C70EP 1EM022885 SHIELD (T) A8CN0FP 1EM323919 STYROFOAM BOTTOM A8C70EP 1EM022886 FFC SHIELD SHEET A8C70EP 1EM324937 SERIAL NO. LABEL L9750UA ---------- STAND HINGE A8C70EP 1EM325037 ACCESSORIES CLOTH(15X40XT0.5) A7140UH 1EM424366 BAG POLYETHYLENE 235X365XT0.03...

  • Page 52: 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. C520 CHIP CERAMIC CAP .(1608) CH J 47pF/ CHD1JJ3CH470 Before replacing any of these components, read C524 ELECTROLYTIC CAP .
  • Page 53 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. C794 CHIP CERAMIC CAP .(1608) CH J 100pF/ CHD1JJ3CH101 C925 ELECTROLYTIC CAP . 10µF/50V M CE1JMASDL100 C926 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1JZ30F104 C795 CHIP CERAMIC CAP .(1608) CH J 100pF/ CHD1JJ3CH101 C927 ELECTROLYTIC CAP .
  • Page 54 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. D900! SCHOTTKY BARRIER DIODE SB360 or NDQZ000SB360 DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 DIODE SCHOTTKY SB360BH NDWZ000SB360 D947 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D901 DIODE FR104BB or NDL1000FR104 DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 DIODE FR104-B NDLZ000FR104...
  • Page 55 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. TRANSISTORS NPN TRANSISTOR 2SC5343G-AT or NQSG02SC5343 NPN TRANSISTOR 2SC5343MG-AT NQSG2SC5343M Q505 TRANSISTOR KTA1267-GR-AT/P or NQS1KTA1267P Q904 TRANSISTOR KTC3199-GR-AT/P or NQS4KTC3199P TRANSISTOR KTA-1266-GR-AT/P or NQS4KTA1266P TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P TRANSISTOR 2SA1015-Y(TE2 F T) or QQSY2SA1015F TRANSISTOR 2SC1815-GR(TE2 F T) or...
  • Page 56 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CEMENT RESISTOR 5W J 1.2 Ω H CHIP RES. 1/10W J 75 Ω or RW051R2PAK10 R763 RRXAJR5Z0750 10MM RES CHIP 1608 1/10W J 75 Ω RRXA750YF002 CARBON RES. 1/4W J 820k Ω R620 RCX4JATZ0824 CARBON RES.
  • Page 57 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W J 22k Ω or CHIP RES. 1/10W F 3.9k Ω or R818 RRXAJR5Z0223 R906! RRXAFR5H3901 RES CHIP 1608 1/10W J 22k Ω CHIP RES.(1608) 1/10W F 3.9k Ω or RRXA223YF002 RRXAFR5Z3901 CHIP RES.
  • Page 58 CHIP RES. 1/10W F 620 Ω or RRXAFR5Z6200 HEAT SINK PMS ASSEMBLY A8CN0FP 1EM426337A RES CHIP 1608 1/10W F 620 Ω RTW6200YF002 HEAT SINK PMT ASSEMBLY A8C70EP 1EM426357 CHIP RES. 1/10W F 3k Ω or R961 RRXAFR5H3001 HEAT SINK PMW A8C70EP 1EM426760 CHIP RES.
  • Page 59 IR SENSOR CBA Ref. No. Mark Description Part No. TACT SWITCH KSM0612B SST0101HH003 Ref. No. Mark Description Part No. SW206 TACT SWITCH SKQSAB or SST0101AL038 IR SENSOR CBA ---------- TACT SWITCH TC-1104(H=5.0) or SST0101DNG02 Consists of the following: TACT SWITCH KSM0612B SST0101HH003 CAPACITOR SW207...
  • Page 60 INVERTER CBA Ref. No. Description Part No. C462 CERAMIC CAP . B K 220pF/500V CCD2JKS0B221 Ref. No. Description Part No. C463 CERAMIC CAP . B K 220pF/500V CCD2JKS0B221 INVERTER CBA ---------- C464 CERAMIC CAP . B K 220pF/500V CCD2JKS0B221 Consists of the following: C465 CHIP CERAMIC CAP .(1608) B K 0.022µF/50V CHD1JK30B223...
  • Page 61 Ref. No. Description Part No. Ref. No. Description Part No. DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 Q407 TRANSISTOR KTC3199-GR-AT/P or NQS4KTC3199P D430 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 TRANSISTOR 2SC1815-GR(TE2 F T) or QQS12SC1815F D431 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 NPN TRANSISTOR 2SC5343MG-AT...
  • Page 62 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 10k Ω TRANSISTOR 2SA950-O (TE2 F T) or QQS002SA950F RRXA103YF002 CHIP RES. 1/10W J 390 Ω or TRANSISTOR (PB FREE) KTA1271-Y-AT/P or NQSYKTA1271P R450 RRXAJR5Z0391 RES CHIP 1608 1/10W J 390 Ω...
  • Page 63 JUNCTION CBA Ref. No. Description Part No. CHIP RES. 1/10W J 390 Ω or R487 RRXAJR5Z0391 Ref. No. Description Part No. RES CHIP 1608 1/10W J 390 Ω RRXA391YF002 JUNCTION CBA ---------- CHIP RES. 1/10W J 10k Ω or R488 RRXAJR5Z0103 Consists of the following: RES CHIP 1608 1/10W J 10k Ω...
  • Page 64 LT6-M22BB/LT6-M22WB A8C70/71EP 2008-08-19...

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