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Sylvania LC420SS8 Service Manual

42" color lcd television
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SERVICE MANUAL

42" COLOR LCD TELEVISION
LC420SS8

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Summary of Contents for Sylvania LC420SS8

  • Page 1: Service Manual

    SERVICE MANUAL 42″ COLOR LCD TELEVISION LC420SS8...

  • Page 2: Table Of Contents

    IMPORTANT SAFETY NOTICE Proper service and repair is important to the safe, reliable operation of all Funai Equipment. The service procedures recommended by Funai and described in this service manual are effective methods of performing service operations. Some of these service special tools should be used when and as recommended.

  • Page 3: Specifications

    SPECIFICATIONS < TUNER / NTSC > ANT. Input ---------------------- 75 ohm Unbal., F type Description Condition Unit Nominal Limit 1. AFT Pull-In Range ±2.3 ±2.1 TV.ch.4 dBµ 2. Syncronizing Sens. CA.ch.31 dBµ CA.ch.87 dBµ < TUNER / ATSC > Description Condition Unit Nominal...
  • Page 4 < AUDIO > All items are measured across 8 Ω load at speaker output terminal with L.P.F. / Video1 Input. Description Condition Unit Nominal Limit 1. Audio Output Power 10% THD: Lch/Rch 10.0/10.0 9.0/9.0 2. Audio Distortion 500mW: Lch/Rch 0.5/0.5 2.0/2.0 -6dB: Lch 20 to 10 k...

  • 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 3. Design Alteration Warning - Do not alter or add 7. Product Safety Notice - Some electrical and to the mechanical or electrical design of this TV mechanical parts have special safety-related receiver. Design alterations and additions, characteristics which are often not evident from including, but not limited to circuit modifications visual inspection, nor can the protection they give and the addition of items such as auxiliary audio...
  • 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 for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards. 1.

  • 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: Top View Bottom View 1.
  • Page 10 3. The flat pack-IC on the CBA is affixed with glue, so With Soldering Iron: be careful not to break or damage the foil of each 1. Using desoldering braid, remove the solder from pin or the solder lands under the IC when all pins of the flat pack-IC.
  • Page 11 2. Installation 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 the foil of each pin of the flat pack-IC on the CBA flux which is applied to all pins of the flat pack-IC, so you can install a replacement flat pack-IC more you can remove it easily.
  • Page 12 Instructions for Handling Semi- conductors Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work. 1. Ground for Human Body Be sure to wear a grounding band (1 MΩ) that is properly grounded to remove any static electricity that may be charged on the body.

  • Page 13: 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 14 (S-5) (S-5) (S-3) (S-4) (S-3) (S-4) (S-5) (S-5) (S-3) (S-5) [3] Rear Cabinet (S-3) (S-5) (S-5) [2] Stand Cover (S-1) (S-1) (S-2) [1] Stand Base (S-2) Fig. D1 A81H1DC...
  • Page 15 (S-11) (N-1) (S-8) [7] Digital Main (S-7) CBA Unit (S-6) (S-10) (S-9) [6] Shield Box [5] Jack Holder(D) (S-6) [4] Inverter Power CBA Fig. D2 A81H1DC...
  • Page 16 (S-14) [10] PCB Holder [8] Jack CBA (S-14) (S-14) (S-12) (S-13) [9] Power Supply CBA (S-14) (S-13) (S-13) Fig. D3 A81H1DC...
  • Page 17 [19] Front Cabinet [17] Side Jack CBA [13] LCD Module Assembly (S-20) (S-17) (S-21) [18] Speaker (S-17) (S-16) (S-17) (S-19) [16] IR Sensor (S-17) (S-17) (S-17) (S-15) (S-16) (S-21) [12] Chassis [15] Junction Bracket (L) (S-17) [18] Speaker [12] Chassis Bracket (R) [11] Stand Shaft (L) (S-17)
  • Page 18 TV Cable Wiring Diagram To LCD Module Assembly Digital Main CBA Unit Inverter Power CBA CN751 Side Jack CN752 CN4201 CN3707 CL7002B CN753 CN701 CN702 CN3701 CN3601 CN3702 CN3705 CN206 CN500 CN501 CN200 Jack CBA CN201 CN202 CN203 CN7001 CL7002A CN801 CN802 CN204...

  • Page 19: 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 20: White Balance Adjustment

    1. Purity Check Mode The following adjustment normally are not attempted in the field. Only when replacing the LCD Panel then adjust This mode cycles through full-screen displays of red, as a preparation. green, blue, and white to check for non-active pixels. 2.
  • Page 21 5. [CUTOFF] Press [3] button to select “COB” for Blue Cutoff adjustment. Press [1] button to select “COR” for Red Cutoff adjustment. [DRIVE] Press [6] button to select “DB” for Blue Drive adjustment. Press [4] button to select “DR” for Red Drive adjustment.

  • Page 22: 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 [POWER] button on the remote control unit.

  • Page 23: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A81H1BLS...
  • Page 24 Video Input Select Block Diagram A81H1BLVIS...
  • Page 25 Audio-1 Block Diagram A81H1BLA1...
  • Page 26 Audio-2 Block Diagram A81H1BLA2...
  • Page 27 LCD Drive Block Diagram A81H1BLLCD...
  • Page 28 Power Supply-1 Block Diagram A81H1BLP1...
  • Page 29 Power Supply-2 Block Diagram A81H1BLP2...

  • Page 30: 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 31 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE_A,_V FUSE. ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE_A,_V. 2.
  • Page 32 Power Supply 1/3 Schematic Diagram CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. NOTE: CAUTION ! : For continued protection against risk of fire, If Main Fuse (F500) is blown , check to see that all components in the power supply The voltage for parts in hot circuit is measured using replace only with same type 8A, 250V fuse.
  • Page 33 Power Supply 2/3 Schematic Diagram VOLTAGE CHART CN200 Pin No. Voltage CN201 Pin No. Voltage 32.9 12.3 12.3 12.3 A81H1SCP2...
  • Page 34 Power Supply 3/3 Schematic Diagram VOLTAGE CHART CN202 Pin No. Voltage CN203 Pin No. Voltage A81H1SCP3...
  • Page 35 Jack & Side Jack Schematic Diagram VOLTAGE CHART CN7001 Pin No. Voltage A81H1SCJ...
  • Page 36 Inverter Power Schematic Diagram NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal. A81H1SCINV...
  • Page 37 Function Schematic Diagram A81H1SCF...
  • Page 38 IR Sensor & Junction Schematic Diagram A81H1SCIR...
  • Page 39 Digital Main 1/9 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into seven and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 8-10 A81H1SCD1...
  • Page 40 Digital Main 2/9 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into seven and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 8-11 A81H1SCD2...
  • Page 41 Digital Main 3/9 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into seven and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 8-12 A81H1SCD3...
  • Page 42 Digital Main 4/9 Schematic Diagram A81H1SCD4 8-13...
  • Page 43 Digital Main 5/9 Schematic Diagram A81H1SCD5 8-14...
  • Page 44 Digital Main 6/9 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into seven and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. A81H1SCD6 8-15...
  • Page 45 Digital Main 7/9 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into seven and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. A81H1SCD7 8-16...
  • Page 46 Digital Main 8/9 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into seven and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 8-17 A81H1SCD8...
  • Page 47 Digital Main 9/9 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into seven and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. A81H1SCD9 8-18...
  • Page 48 Power Supply CBA Top View Because a hot chassis ground is present in the power CAUTION ! supply circuit, an isolation transformer must be used. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, Also, in order to have the ability to increase the input If Main Fuse (F500) is blown , check to see that all components in the power supply...
  • Page 49 Power Supply CBA Bottom View Because a hot chassis ground is present in the power CAUTION ! supply circuit, an isolation transformer must be used. 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 CAUTION ! : For continued protection against risk of fire, If Main Fuse (F500) is blown , check to see that all components in the power supply...
  • Page 50 Jack CBA Top View BA81H0F01022-1 8-21...
  • Page 51 Jack CBA Bottom View PIN 2 OF CN7001 PIN 6 OF CN7001 PIN 1 OF CN7001 PIN 7 OF CN7001 PIN 3 OF CN7001 PIN 8 OF CN7001 PIN 12 OF CN7001 PIN 14 OF CN7001 PIN 20 OF CN7001 PIN 36 OF CN7001 PIN 22 OF...
  • Page 52 Inverter Power CBA Top View Because a hot chassis ground is present in the power NOTE: supply circuit, an isolation transformer must be used. The voltage for parts in hot circuit is measured using Also, in order to have the ability to increase the input hot GND as a common terminal.
  • Page 53 Inverter Power CBA Bottom View Because a hot chassis ground is present in the power NOTE: supply circuit, an isolation transformer must be used. The voltage for parts in hot circuit is measured using Also, in order to have the ability to increase the input hot GND as a common terminal.
  • Page 54 Function CBA Top View Junction CBA Top & Bottom View BA81H0F01012-4 Function CBA Bottom View BA81H0F01012-2 8-25...
  • Page 55 IR Sensor CBA Top View Side Jack CBA Top View Side Jack CBA Bottom View IR Sensor CBA Bottom View BA81H0F01022-3 BA81H0F01012-3 8-26...

  • Page 56: Waveforms

    WAVEFORMS WF1 ~ WF7 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: NTSC Color Bar Signal (with 1kHz Audio Signal) Pin 20 of CN7001 (CVBS1) Pin 7 of CN7001 (COMP1-Pb) Pin 36 of CN7001 (CVBS2) Pin 1 of CN7001 (COMP2-Pb) CVBS 0.2V...

  • Page 57: Wiring Diagram

    WIRING DIAGRAM 10-1 A81H1WI...

  • Page 58: Exploded Views

    EXPLODED VIEWS Cabinet Side Jack CBA CLN801 SP901 IR Sensor SP902 Junction CLN370 CLN802 LCD-1 CLN420 Jack CBA Function CBA CLN752 CLN751 Inverter Power L12 B18 CLN501 Digital Main Digital Main CBA Unit CBA Unit Parts See Electrical Parts List for parts with this mark.
  • Page 59 Packing Packing Tape Tape Tape Some Ref. Numbers are not in sequence. LCD Unit Assembly Packing Tape Packing Tape Packing Tape Stand Assembly Packing Tape PP Band 11-2 A81H1PEX...

  • Page 60: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. PACKING Before replacing any of these components, read STYROFORM TOP A81H0UH 1EM021800 carefully the product safety notice in this service STYROFORM BOTTOM A81H0UH 1EM021801 manual.

  • Page 61: Electrical Parts List

    ELECTRICAL PARTS LIST DIGITAL MAIN CBA UNIT PRODUCT SAFETY NOTE: Products marked with a # have special characteristics important to safety. Ref. No. Description Part No. Before replacing any of these components, read DIGITAL MAIN CBA UNIT 1ESA14707 or carefully the product safety notice in this service 1ESA20892 manual.
  • Page 62 Ref. No. Description Part No. Ref. No. Description Part No. C525 CERAMIC CAP .(AX) B K 1000pF/50V CCA1JKT0B102 CN203 CONNECTOR 23P Refer to page 13-1 C526 SAFETY CAP . 1000pF/250V KX CA2E102MR050 CN204 242 SERIES CONNECTOR 224202111W1 J322C11TG001 C527 SAFETY CAP . 1000pF/250V KX CA2E102MR050 CN206 TWG CONNECTOR 09P TWG-P09P-A1...
  • Page 63 Ref. No. Description Part No. Ref. No. Description Part No. D615 ZENER DIODE MTZJT-7720B QDTB00MTZJ20 Q504# TRANSISTOR 2SA950-Y(TE2 F T) QQSY02SA950F D616 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 Q505 TRANSISTOR KTC3199-GR-AT/P NQS4KTC3199P D650 SCHOTTKY BARRIER DIODE ERC84-009 QDLZERC84009 Q506 TRANSISTOR KTC3199-GR-AT/P NQS4KTC3199P D651 SCHOTTKY BARRIER DIODE ERC81-004 QDPZERC81004...
  • Page 64 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 220k Ω METAL OXIDE FILM RES. 2W J 100k Ω R502 RCX4JATZ0224 R617 RN02104DP004 CARBON RES. 1/4W J 220k Ω RES METALIZED FILM T 1/4W F 2.21k Ω R503 RCX4JATZ0224 R650...
  • Page 65 Ref. No. Description Part No. Ref. No. Description Part No. SA503 SURGE ABSORBER RA-452MS-V7-Y PDVAEA0DC452 RS101 PHOTO LINK MODULE KSM-712TH2E USESJRSKK044 SA504 PCB JUMPER D0.6-P7.5 JW7.5T JUNCTION CBA T600# TRANS POWER 7736 LTT3PC0KT033 TM601 EYELET TYPE D-1 0VM406868 Ref. No. Description Part No.
  • Page 66 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 47k Ω C7202 ELECTROLYTIC CAP . 47µF/10V M H7 CE1AMASSL470 R7054 RRXAJR5Z0473 CHIP RES. 1/10W J 24k Ω C7203 ELECTROLYTIC CAP . 47µF/10V M H7 CE1AMASSL470 R7055 RRXAJR5Z0243 CARBON RES.
  • Page 67 Ref. No. Description Part No. Ref. No. Description Part No. CL7002 WIRE ASSEMBLY 005 14PIN AWG26 WX1A81H0-005 IC701# IC HIGH-VOLTAGE RESONANT CONTR NSZBA0SSS312 L6599N JK7001 JACK SW DIN PCB S YKF51-5379V JYEJ040JC002 IC702# PHOTO COUPLER LTV817MBF NPEBLTV817MF JK7002 JACK SW RCA PCB S RCA-347HDT-02 JYRJ030YUQ01 IC703# PHOTO COUPLER LTV817MBF...
  • Page 68 Ref. No. Description Part No. BC784 BEAD INDUCTOR FBR07HA121TB-00 LLBF00ZTU021 BC785 PCB JUMPER D0.6-P5.0 JW5.0T SCREW B-TIGHT D3X8 BIND HEAD+ GBJB3080 T701# TRANS POWER ETS42LZ196AD LTT4PC0MS004 SIDE JACK CBA Ref. No. Description Part No. SIDE JACK CBA ---------- Consists of the following: RESISTORS CHIP RES.

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