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Symphonic LCD-B15B6 Service Manual

15" color lcd television
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SERVICE MANUAL

15" COLOR LCD TELEVISION
LCD-B15B6

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Summary of Contents for Symphonic LCD-B15B6

  • Page 1: Service Manual

    SERVICE MANUAL 15" COLOR LCD TELEVISION LCD-B15B6...

  • Page 2: Table Of Contents

    15″ COLOR LCD TELEVISION LCD-B15B6 TABLE OF CONTENTS Specifications ................1-1 Important Safety Precautions.

  • Page 3: Specifications

    SPECIFICATIONS <TUNER> ANT. Input ------------------- 80 dBµV, Video: PAL 87.5%, Audio: 30 kHz dev (1 kHz Sin) Test Input Signal----------- 400Hz 30% modulation Description Condition Unit Nominal Limit 1. Intermediate Freq. Picture PAL-BG/I/DK 38.9 Sound PAL-BG 33.4 PAL-I 32.9 PAL-DK 32.4 2.

  • Page 4: 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 5: Specifications

    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 6 Precautions during Servicing A. Parts identified by the ! symbol are critical for M. When installing parts or assembling the cabinet safety. parts, be sure to use the proper screws and Replace only with part number specified. tighten certainly. B. In addition to safety, other parts and assemblies are specified for conformance with regulations applying to spurious radiation.
  • Page 7 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 8: 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 9 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 10 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 11: 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 12 [1] Rear Cabinet [3] Bracket [2] Stand A Shaft [4] Holder [5] Stand B Fig. D1 L4531DC...
  • Page 13 [12] Front Cabinet S-10 [10] [9] Function CBA Speaker S-10 S-10 S-11 Speaker Holders [11] IR Sensor S-12 [10] Speaker Speaker Holders S-11 [8] LCD Main CBA Unit & Liquid Crystal Panel Unit [6] Jack Holder [7] Main CBA Fig. D2 L4531DC...

  • Page 14: Wiring Diagram

    TV Cable Wiring Diagram Function CBA CN31B To Liquid Crystal Panel Unit LCD Main CBA Unit CN106 CN311 CN312 Main CBA CN103B CN102B CN101B CN401 To Liquid CN103A CN101A CN102A Crystal Panel Unit CN403 CN802 To Speaker CN53 CN801 IR Sensor CBA To Speaker CLN53 Fig.

  • Page 15: How To Initialize The Lcd Television

    HOW TO INITIALIZE THE LCD TELEVISION To put the program back at the factory-default, initialize the LCD television as the following procedure. How to initialize the LCD television: 1. Turn the power on. (Use main power on the TV unit.) 2.

  • Page 16: 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 17: Flicker Adjustment

    2. Flicker Adjustment BUTTON DATA ITEM (on the remote 1. Enter the Service mode. (See page 6-1.) VALUE control) 2. Press [2] button on the remote control unit. C-BRT(NTSC) The following screen appears. C-CNT(NTSC) C-CLR-R(NTSC) MENU → 9 C-CLR-B(NTSC) VCOM C-TNT(NTSC) C-SHR(NTSC) BRIGHT...

  • Page 18: White Balance Adjustment

    The following adjustment normally are not 6. [AV1(RGB)]----(APL 80%) Press “6” button to select “C-DB(C/D/S-2)” for Blue attempted in the field. Only when replacing the adjustment. Press “4” button to select “C-DR(C/D/ LCD Panel then adjust as a preparation. S-2)” for Red adjustment.When “x” value and “y” value are not within specification, adjust “C-DB(C/ 3.

  • Page 19: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram L4531BLS...
  • Page 20 IF/Video Block Diagram L4531BLIF...
  • Page 21 Audio Block Diagram L4531BLA...
  • Page 22 LCD Block Diagram L4531BLLCD...
  • Page 23 Power Supply Block Diagram L4531BLP...
  • Page 24 LCD Backlight Block Diagram L4531BLLB...

  • Page 25: Schematic Diagrams / Cba's And Test Points

    SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS Standard Notes 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. Replacement parts that have these special safety characteristics are identified in this manual and its supplements;...
  • Page 26 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 27 Main 1/4 Schematic Diagram L4531SCM1...
  • Page 28 Main 2/4 Schematic Diagram VOLTAGE CHART CN103A Pin No. Voltage L4531SCM2...
  • Page 29 Main 3/4 Schematic Diagram CAUTION ! NOTE: CAUTION ! For continued protection against fire hazard, The voltage for parts in hot circuit is measured using Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. replace only with the same type fuse. hot GND as a common terminal.
  • Page 30 Main 4/4 & IR Sensor Schematic Diagram VOLTAGE CHART CN102A Pin No. Voltage L4531SCM4...
  • Page 31 Function Schematic Diagram L4531SCF...
  • Page 32 LCD Main 1/2 Schematic Diagram L4531SCL1...
  • Page 33 LCD Main 2/2 Schematic Diagram L4531SCL2...
  • Page 34 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 35 Main CBA Bottom View CAUTION ! CAUTION ! Because a hot chassis ground is present in the power Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. supply circut, an isolation transformer must be used. For continued protection against fire hazard, replace only with the same type fuse.
  • Page 36 Function CBA Top View IR Sensor CBA Top & Bottom View BL4520F01012-3 Function CBA Bottom View BL4520F01012-2 8-12...

  • Page 37: 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 9 of CN103A Pin 3 of CN103A AUDIO 0.1V 0.5ms CVBS2 0.2V...
  • Page 38 WF9 ~ WF14 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: PAL Color Bar Signal (with 1kHz Audio Signal) R904 R997 WF12 10µs CTKH 20ns R907 R902 WF10 WF13 STH1 1µs STV1 R901 R905 WF11 WF14 20µs...

  • Page 39: Wiring Diagram

    WIRING DIAGRAMS 10-1 L4531WI...

  • Page 40: Exploded View

    EXPLODED VIEWS Cabinet Function CBA SP802 CLN802 IR Sensor CBA SP801 CLN801 LCD Main CBA Unit & Liquid Crystal Panel Unit See Electrical Parts List for parts with this mark. Main CBA AC601 11-1 L4531EX...
  • Page 41 Packing X2-1 Packing Tape Tape Packing Tape Packing Tape Packing Tape Some Ref. Numbers are not in sequence. 11-2 L4531PEX...

  • Page 42: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a PARTS produced in EU ! have special characteristics important to safety. Before replacing any of these components, read carefully the product safety notice in this service Ref. No. Description Part No. manual.

  • Page 43: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. ! have special characteristics important to safety. ELECTROLYTIC CAP . 220µF/25V M or CA1E221SP085 Before replacing any of these components, read ELECTROLYTIC CAP . 220µF/25V M CE1EMASTM221 carefully the product safety notice in this service C421...
  • Page 44 Ref. No. Description Part No. Ref. No. Description Part No. ACROSS THE LINE CAP . 0.1µF/250V K or CT2E104DC011 C656 ELECTROLYTIC CAP . 1µF/50V M or CE1JMASDL1R0 ACROSS THE LINE CAP . 0.1U/250V CT2E104DC015 ELECTROLYTIC CAP 1µF/50V M or CA1J1R0SP085 C608 CERAMIC CAP .
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. C781 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 ALUMINUM ELECTROLYTIC CAP 3.3µF/50V M CE1JMASTM3R3 C782 ELECTROLYTIC CAP . 47µF/16V M H7 or CE1CMAVSL470 C852 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V CHD1JZ30F104 ALUMINUM ELECTROLYTIC CAP 47µF/16V H7 CE1CMAVSM470 C853...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. SWITCHING DIODE KDS160E-RTK/P ND1ZKDS160EP D624 DIODE ZENER 1ZC18(Q) QDLZ001ZC18Q D430 SWITCHING DIODE 1SS400 or QD1Z001SS400 D631! DIODE SCHOTTKY 30PHA20 QDLZ030PHA20 SWITCHING DIODE KDS160E-RTK/P ND1ZKDS160EP D632! DIODE FR104-B or NDLZ000FR104 D431 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 DIODE FR104BB...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. D756 ZENER DIODE MTZJT-775.1B or QDTB0MTZJ5R1 Q422 TRANSISTOR 2SC4081 T106 Q QQ1Q02SC4081 ZENER DIODE DZ-5.1BSBT265 NDTB0DZ5R1BS Q424 TRANSISTOR 2SC4081 T106 Q QQ1Q02SC4081 D802! SWITCHING DIODE 1SS400 or QD1Z001SS400 Q425 TRANSISTOR 2SC4081 T106 Q QQ1Q02SC4081 SWITCHING DIODE KDS160E-RTK/P ND1ZKDS160EP...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 10k Ω or CHIP RES. 1/10W J 10k Ω or RRXAJR5Z0103 R464 RRXAJR5Z0103 RES CHIP 1608 1/10W J 10k Ω RES CHIP 1608 1/10W J 10k Ω RRXA103YF002 RRXA103YF002 CHIP RES.
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 680k Ω METAL OXIDE FILM RES. 2W J 5.6 Ω R609 RCX4JATZ0684 RN025R6DP004 CARBON RES. 1/4W J 150 Ω CHIP RES. 1/10W J 75 Ω or R610 RCX4JATZ0151 R701...
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 39k Ω CHIP RES. 1/10W J 47k Ω or RRXA393YF002 R814 RRXAJR5Z0473 CHIP RES. 1/10W J 75 Ω or RES CHIP 1608 1/10W J 47k Ω R751 RRXAJR5Z0750 RRXA473YF002...
  • Page 51 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 10k Ω CHIP RES. 1/10W J 1.5k Ω or RRXA103YF002 RRXAJR5Z0152 CARBON RES. 1/4W J 10k Ω RES CHIP 1608 1/10W J 1.5k Ω R910 RCX4JATZ0103 RRXA152YF002 CHIP RES.
  • Page 52 LCD-B15B6 L4531BB 2006-07-25...

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