FUNAI LT5-M20BB Service Manual
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FUNAI LT5-M20BB Service Manual

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SERVICE MANUAL
20" COLOR LCD TELEVISION
LT5-M20BB

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  • Page 1 SERVICE MANUAL 20" COLOR LCD TELEVISION LT5-M20BB...

  • Page 2: Table Of Contents

    20″ COLOR LCD TELEVISION LT5-M20BB TABLE OF CONTENTS Specifications ................1-1 Important Safety Precautions.

  • Page 3: Specifications

    SPECIFICATIONS <TUNER> VHF/UHF Input : 75Ω unbal.,IEC Connector Center IF : SECAM-L 38.9MHz, SECAM-L’ 33.90MHz Description Condition Unit Nominal Limit 1. Video S/N 80dB 2. Audio S/N 40/40 <DVB-T> Description Condition Unit Nominal Limit 1. RECEIVED 1000 FREQ.RANGE -150 (-60dBm, 45ch.) 2.
  • 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 3. Audio Freq. Response -6dB: Lch 70 to 8K -6dB: Rch 70 to 8K...

  • 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-3) (S-3) (S-3) (S-3) (S-4) (S-1) (S-3) [2] Stand Cover [1] Arm Assembly (S-2) Fig. D1 A7343DC...
  • Page 14 [14] Front Cabinet [4] Function CBA (S-5) [13] Speaker (S-15) (S-14) Speaker Holders (S-14) Washer [12] Junction-B (S-6) [5] IR Sensor (S-13) (S-14) (S-14) Earth Speaker Holders Plate [13] Speaker (S-15) (S-7) (S-13) [10] LCD Main CBA Unit & (S-14) (S-13) Liquid Crystal Panel Unit [6] Tilt Stand...
  • Page 15 TV Cable Wiring Diagram DVB-T Module CBA Unit Function CBA CN51A To Liquid Crystal Panel Unit LCD Main CBA Unit CN1001 CN1000 Main CBA CN101B CN102B CN103B CN51B CN401 CN59 CN101A CN102A CN103A CN57 To Liquid Crystal Panel Unit CN55 CN54 Junction-A CN403...

  • Page 16: How To Initialize The Lcd Television

    HOW TO INITIALIZE THE LCD TELEVISION How to initialize the LCD television: 1. Turn the power off. 2. While pressing [MENU] button, press [STANDBY- ON] button on the TV unit To cancel the service mode, press [STANDBY-ON] button on the TV unit. 3.

  • Page 17: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: 1. Initial Setting “CBA” is abbreviation for “Circuit Board Assem- General bly.” Enter the Service mode. NOTE: Electrical adjustments are required after replacing Set the each initial data as shown on table 1 below. circuit components and certain mechanical parts. It is Table 1: Initial Data important to perform these adjustments only after all repairs and replacements have been completed.
  • Page 18 2. Flicker Adjustment BUTTON DATA ITEM (on the remote VALU 1. Enter the Service mode. control) 2. Press [2] button on the remote control unit. RGB-BRT(SECAM) The following screen appears. RGB-CNT(SECAM) [MENU(SECAM)] RGB-CLR-R(SECAM) → [4] RGB-CLR-B(SECAM) VCOM RGB-SHR(SECAM) AV-BRT(NTSC) AV-CNT(NTSC) [MENU(NTSC)] →...
  • Page 19 The following adjustment normally are not S-1)” for Red adjustment. When “x” value and “y” value are not within specification, adjust “COB (C/ attempted in the field. Only when replacing the D/S-1)” or “COR (C/D/S-1)”. Refer to “1. Initial LCD Panel then adjust as a preparation. Setting.”...
  • Page 20 4. Sub-Brightness Adjustment Purpose: To get proper brightness. Symptom of Misadjustment: If Sub-Brightness is incorrect, proper brightness cannot be obtained by adjusting the Brightness Control. Adj. Point Input Ant. input, Any channel, SMPTE pattern, [MENU] [RF/AV2(CVBS)]: CG-931 (KENWOOD), button [AV1(RGB)]: CG-931 (KENWOOD), [DVB]: CG-931 (KENWOOD), W/O SETUP 7.5IRE M.

  • Page 21: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A7343BLS...
  • Page 22 IF/Video Block Diagram A7343BLIF...
  • Page 23 Audio Block Diagram A7343BLA...
  • Page 24 LCD Block Diagram A7343BLLCD...
  • Page 25 Power Supply Block Diagram A7343BLP...
  • Page 26 LCD Backlight Block Diagram A7343BLLB...

  • 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 1/4 & IR Sensor Schematic Diagram VOLTAGE CHART CN101A Pin No. Voltage 24.4 -6.2 10.9 CN102A Pin No. Voltage CN55 Pin No. Voltage CN59 Pin No. Voltage A7343SCM1...
  • Page 30 Main 2/4, Junction-A & Junction-B Schematic Diagram VOLTAGE CHART CN103A Pin No. Voltage CN57 Pin No. Voltage A7343SCM2...
  • Page 31 Main 3/4 Schematic Diagram A7343SCM3...
  • Page 32 Main 4/4 Schematic Diagram VOLTAGE CHART CN54 Pin No. Voltage 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 33 Function Schematic Diagram A7343SCF...
  • Page 34 LCD Main 1/2 Schematic Diagram A7343SCL1...
  • Page 35 LCD Main 2/2 Schematic Diagram A7343SCL2...
  • Page 36 Main CBA Top View CAUTION ! CAUTION ! Because a hot chassis ground is present in the power 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. If Main Fuse (F601) is blown , check to see that all components in the power supply Also, in order to have the ability to increase the input replace only with the same type fuse.
  • Page 37 Main CBA Bottom View CAUTION ! CAUTION ! Because a hot chassis ground is present in the power 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. replace only with the same type fuse.
  • Page 38 Function CBA Top View IR Sensor CBA Top & Bottom View BA7343F01013-2 Function CBA Bottom View Junction-A CBA Top & Bottom View BA7343F01013-3 Junction-B CBA Top & Bottom View BA7343F01021 BA7343F01013-4 8-12...

  • Page 39: Waveforms

    WAVEFORMS WF1 ~ WF8 = 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 22 of CN102A Pin 21 of CN102A AUDIO 0.1V 0.5ms VIDEO1 0.2V...

  • Page 40: Wiring Diagram

    WIRING DIAGRAMS A7343WI 10-1...

  • Page 41: Exploded View

    EXPLODED VIEWS Cabinet Function CBA SP802 IR Sensor CBA SP801 Junction-B LCD Main CBA Unit & Liquid Crystal Panel Unit See Electrical Parts List for parts with this mark. Junction-A CBA Main CBA AC601 DVB-T Module CBA Unit 11-1 A7343CEX...
  • Page 42 Packing Some Ref. Numbers are not in sequence. X2-2 Tape Tape Tape Packing Tape Packing Tape Packing Tape 11-2 A7343PEX...

  • Page 43: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a ! have special characteristics important to safety. Before replacing any of these components, read carefully the product safety notice in this service manual. Don't degrade the safety of the product through improper servicing.

  • Page 44: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. ! have special characteristics important to safety. C301 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V CHD1JZ30F104 Before replacing any of these components, read C302 CHIP CERAMIC CAP .(1608) CH J 47pF/50V CHD1JJ3CH470 carefully the product safety notice in this service C303...
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. ACROSS THE LINE CAP . 0.22µF/250V or CT2E224DC017 ALUMINUM ELECTROLYTIC CAP 330µF/6.3V CE0KMAVSM331 CAP METALIZED FILM 0.22µF/300V K 3.5MM CT2F224DC004 C790 CHIP CERAMIC CAP . F Z 2.2µF/10V CHD1AZ30F225 C616! CAP ELECTROLYTIC 180µF/400V M CA2H181DYG10 C791...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. C885 CHIP CERAMIC CAP .(1608) F Z 0.1µF/25V CHD1EZ30F104 ALUMINUM ELECTROLYTIC CAP 10µF/50V M CE1JMASTM100 C886 ELECTROLYTIC CAP . 10µF/50V M or CE1JMASDL100 C950 ELECTROLYTIC CAP . 220µF/6.3V M or CE0KMASDL221 ELECTROLYTIC CAP .
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. D424 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D621 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 D425 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D622 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. IC SHUNT REGULATOR SL431A-AT or NSZBA0TAUK01 DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 IC SHUNT REGULATOR AZ431BZ-ATRE1 NSZBA0TBCD01 D919 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 IC301 IC VOLTAGE REGULATOR PQ070XF02SZH QSZBA0SSH073 DIODE SWITCHING HSS4148TE-E QDTZ0HSS4148 IC601! PHOTO COUPLER PS2561L1-1-A-V(L)
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. Q401 NPN TRANSISTOR POWER 2SC4881F HFE QQWZ2SC4881F CHIP TRANSISTOR 2SC3928A-T112-1Z or QQ1Z2SC3928A MAX320 or CHIP TRANSISTOR 2SC2412K T146Z QQ1Z2SC2412K TRANSISTOR(PB FREE) KTC2026-Y/P NQEYKTC2026P Q734 TRANSISTOR KTA1267-GR-AT/P or NQS1KTA1267P Q402 TRANSISTOR 2SA950-O (TE2 F T) or QQS002SA950F TRANSISTOR KTA-1266-GR-AT/P or NQS4KTA1266P...
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 220 Ω TRANSISTOR 2SA1015-Y(TE2 F T) or QQSY2SA1015F RRXA221YF002 CHIP RES. 1/10W F 8.2k Ω or TRANSISTOR 2SA1015-GR(TE2 F T) QQS12SA1015F R312 RRXAFR5H8201 CHIP RES. 1/10W F 8.2k Ω or Q912 CHIP TRANSISTOR KTC3875S-Y-RTK/P or NQ1YKTC3875S...
  • Page 51 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 1k Ω or CHIP RES. 1/10W J 6.8k Ω or R423 RRXAJR5Z0102 R505 RRXAJR5Z0682 RES CHIP 1608 1/10W J 1.0k Ω RES CHIP 1608 1/10W J 6.8k Ω RRXA102YF002 RRXA682YF002 CHIP RES.
  • Page 52 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 33k Ω RES CHIP 1608 1/10W J 100k Ω RRXA333YF002 RRXA104YF002 CHIP RES.(1608) 1/10W 0 Ω or CHIP RES. 1/10W J 39k Ω or R736 RRXAZR5Z0000 R793 RRXAJR5Z0393...
  • Page 53 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 47k Ω or CHIP RES. 1/10W F 360 Ω or R865 RRXAJR5Z0473 R915! RRXAFR5H3600 RES CHIP 1608 1/10W J 47k Ω CHIP RES. 1/10W F 360 Ω or RRXA473YF002 RRXAFR5Z3600 CHIP RES.
  • Page 54 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 6.8k Ω R963 RCX4JATZ0682 JK751 JACK RGB PCB S 21PIN / MRC-021H-02 JXGJ210LY001 CHIP RES. 1/10W J 3.3k Ω or R964 RRXAJR5Z0332 JK801 MINIATURE JACK(PB FREE) CKX-035-318AZ4 JYSL010SNJ01 RES CHIP 1608 1/10W J 3.3k Ω...
  • Page 55 FUNCTION CBA Ref. No. Description Part No. FUNCTION CBA 1ESA15109 Consists of the following: CAPACITOR CERAMIC CAP .(AX) F Z 0.01µF/25V CCA1EZTFZ103 CONNECTOR CN51A WIRE ASSEMBLY 4PIN SW 4PIN 140MM WX1A7340-003 RESISTORS CARBON RES. 1/4W J 10k Ω RCX4JATZ0103 CARBON RES. 1/4W J 100 Ω RCX4JATZ0101 CARBON RES.
  • Page 56 LT5-M20BB A7343FP 2007-11-27...

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