Sylvania LC155SL8 Service Manual
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Sylvania LC155SL8 Service Manual

Sylvania LC155SL8 Service Manual

15″ color lcd television
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SERVICE MANUAL
15" COLOR LCD TELEVISION
LC155SL8

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Summary of Contents for Sylvania LC155SL8

  • Page 1 SERVICE MANUAL 15″ COLOR LCD TELEVISION LC155SL8...

  • 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 > VHF/UHF Input : 75 ohm Unbal., F type Intermediate Freq. : Picture 45.75 MHz, Sound 41.25 MHz Description Condition Unit Nominal Limit 1. Video S/N 80dB >43 2. Audio S/N 80dB >45 < LCD PANEL > Description Condition Unit...
  • Page 4 < ATSC > Description Condition Unit Nominal Limit 1. RECEIVED FREQ. RANGE >100 (-28dBm) – VHF LOW BAND. CH.4 2. ATSC DYNAMIC RANGE VHF HI BAND. CH.10 -76/0 (min./max.) UHF BAND. CH.41 VHF LOW BAND. CH.4 3. ATSC SUSCEPTIBILITY TO VHF HI BAND.

  • 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 L. When connecting or disconnecting the internal safety. connectors, first, disconnect the AC plug from the Replace only with part number specified. AC supply outlet. B. In addition to safety, other parts and assemblies M.
  • 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/ 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 14 [3] Rear Cabinet (S-3) (S-4) (S-3) (S-3) (S-1) (S-3) [2] Stand Cover [1] Arm Assembly (S-2) (S-2) Fig. D1 A7120DC...
  • Page 15 (S-5) [16] Front Cabinet [15] Speaker [4] Function CBA (S-5) [14] Junction-B (S-5) Speaker Holder (S-13) [12] LCD Module [11] LVDS CBA Unit Desolder (S-12) [10] LCD Holder (S-11) (S-7) (S-10) (S-11) [9] Main CBA Desolder (S-9) (S-10) (S-10) [15] Speaker [7] Jack (S-11) (S-9)
  • Page 16 TV Cable Wiring Diagram To LCD Module Function CBA CL1107 CN1402 CN1401 CN1411 LVDS CBA Unit Main CBA CN1301 CN1201 CN1202 CN401 Module CN403 Junction-A CN62 CN61 CL801 CN801 CN1302 CN802 Speaker CL802 CN102 CN101 Junction-B CL1104 DTV Module CBA Unit IR Sensor CBA To Speaker Fig.

  • Page 17: 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 18 The following adjustment normally are not Button Data attempted in the field. Only when replacing the Item (on the service Value LCD Panel then adjust as a preparation. remote control) 2. White Balance Adjustment D2-BRT D2-CNT Purpose: To mix red, green and blue beams correctly for pure white.
  • Page 19 D1)” for Red adjustment. When “x” value and “y” 3. Make sure that contrast and brightness controls value are not within specification, adjust “COB (C/ are set to initial position. D1)” or “COR (C/D1)”. Refer to “1. Initial Setting.” 4. Confirm “C” position was beginning to bright. 6.

  • Page 20: How To Initialize The Lcd Television

    HOW TO INITIALIZE THE LCD TELEVISION How to initialize the LCD television: 1. Turn the power on. (Use main power on the TV unit.) 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.

  • Page 21: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A7120BLS...
  • Page 22 IF/Video Block Diagram A7120BLIF...
  • Page 23 Audio Block Diagram A7120BLA...
  • Page 24 DTV Module Block Diagram A7120BLDTV...
  • Page 25 LCD Block Diagram A7120BLLCD...
  • Page 26 Power Supply Block Diagram A7120BLP...
  • Page 27 LCD Backlight Block Diagram A7120BLLB...

  • Page 28: 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 29 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 30 Main 1/5 Schematic Diagram VOLTAGE CHART CN1201 Pin No. Voltage CN1202 Pin No. Voltage A7120SCM1...
  • Page 31 Main 2/5 Schematic Diagram VOLTAGE CHART CN61 Pin No. Voltage CN62 Pin No. Voltage A7120SCM2...
  • Page 32 Main 3/5, Junction-A & Junction-B Schematic Diagram A7120SCM3...
  • Page 33 Main 4/5 Schematic Diagram A7120SCM4...
  • Page 34 Main 5/5 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 (F601) 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 4 A, 125V fuse.
  • Page 35 Function Schematic Diagram A7120SCF...
  • Page 36 IR Sensor Schematic Diagram A7120SCIR...
  • Page 37 LVDS Schematic Diagram A7120SCLV 8-10...
  • Page 38 DTV Module 1/2 Schematic Diagram 8-11 A7120SCD1...
  • Page 39 DTV Module 2/2 Schematic Diagram 8-12 A7120SCD2...
  • Page 40 Main 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 (F601) is blown , check to see that all components in the power supply...
  • Page 41 Main 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. CAUTION ! : For continued protection against risk of fire, Also, in order to have the ability to increase the input If Main Fuse (F601) is blown , check to see that all components in the power supply...
  • Page 42 Function CBA Top View IR Sensor CBA IR Sensor CBA Top View Bottom View BA7120F01021-2 Junction-A CBA Top & Bottom View Function CBA Bottom View BA7120F01021-3 Junction-B CBA Top & Bottom View BA7120F01021-4 BA7120F01021-1 8-15...

  • Page 43: 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 71 of IC1202 Pin 56 of IC1202 CVBS 0.2V 20µs VIDEO-Pb 0.2V 20µs Pin 76 of IC1202 Pin 66 of IC1202 20µs...

  • Page 44: Wiring Diagram

    WIRING DIAGRAM 10-1 A7120WI...

  • Page 45: Ic Pin Function Descriptions

    IC PIN FUNCTION DESCRIPTIONS IC1202 (LCD Drive / LCD Signal Signal Name Function Process / TV Micro Controller) Crystal Oscillation Output 38 XOUT (27MHz) Signal Name Function 39 VSS VDD+3.3V +3.3V VDD 40 VSS VDD+3.3V +3.3V VDD 41 VSS KEY-IN-1 Key Input 1 42 VDD+3.3V +3.3V VDD...
  • Page 46 Signal Name Function Signal Name Function 76 S-VIDEO-Y Luminance Signal Input 119 VSS 77 AVDDA +3.3V VDD 120 VSS 78 VSS 121 VSS 79 VDD+3.3V +3.3V VDD 122 LPF Panel Clock PLL Filter 80 VSS 123 NU Not Used 81 VSS 124 NU Not Used 82 VDD+3.3V...

  • Page 47: Exploded Views

    EXPLODED VIEWS Cabinet Junction-B CBA SP802 Function CBA B1 L6 CL1411 LVDS CBA Unit IR Sensor CBA SP801 Junction-A CBA Main CBA CL1401 CL1402 LCD-1 DTV Module CBA Unit See Electrical Parts List for parts with this mark. AC601 12-1 A7120CEX...
  • Page 48 Packing Some Ref. Numbers are not in sequence. Packing Tape Tape Packing Tape Packing Tape Packing Tape 12-2 A7120PEX...

  • Page 49: 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 50: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. CHIP CERAMIC CAP . F Z 1µF/10V CHD1AZ30F105 Before replacing any of these components, read CHIP CERAMIC CAP .(1608) F Z 0.1µF/25V CHD1EZ30F104 carefully the product safety notice in this service CHIP CERAMIC CAP .
  • Page 51 Ref. No. Description Part No. Ref. No. Description Part No. C853 ELECTROLYTIC CAP . 2.2µF/50V M CE1JMASDL2R2 C1322 CHIP CERAMIC CAP .(1608) CH J 33pF/50V CHD1JJ3CH330 C854 CHIP CERAMIC CAP .(1608) B K 0.1µF/50V CHD1JK30B104 C1323 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 C855 CHIP CERAMIC CAP .(1608) B K 0.1µF/50V...
  • Page 52 Ref. No. Description Part No. Ref. No. Description Part No. D426 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 D952 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 D427 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 D953 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 D428 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 D954 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 D429 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133...
  • Page 53 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W 0 Ω Q802 TRANSISTOR 2SC2785(F) QQSF02SC2785 R423 RRXAZR5Z0000 CHIP RES. 1/10W J 3.3k Ω Q901 TRANSISTOR 2SC2120-Y(TE2 F T) QQSY2SC2120F R424 RRXAJR5Z0332 CHIP RES. 1/10W J 10k Ω Q902 TRANSISTOR 2SC2120-Y(TE2 F T) QQSY2SC2120F...
  • Page 54 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 47k Ω CARBON RES. 1/4W J 2.2 Ω R813 RRXAJR5Z0473 R935 RCX4JATZ02R2 CARBON RES. 1/4W J 22k Ω CARBON RES. 1/4W J 2.2 Ω R814 RCX4JATZ0223 R936 RCX4JATZ02R2 CARBON RES.
  • Page 55 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 33 Ω R1226 RRXAJR5Z0330 POW HEAT SINK A7120UH 1EM423993 CHIP RES. 1/10W J 1k Ω R1229 RRXAJR5Z0102 BC61 BEADS INDUCTOR FBR07HA121SB-00 LLBF00STU030 CHIP RES. 1/10W J 33 Ω R1231 RRXAJR5Z0330 BC62...
  • Page 56 Ref. No. Description Part No. CARBON RES. 1/4W J 6.8k Ω R1108 RCX4JATZ0682 CARBON RES. 1/4W J 10k Ω R1109 RCX4JATZ0103 CARBON RES. 1/4W J 100 Ω R1110 RCX4JATZ0101 SWITCHES SW1101 TACT SWITCH SKQSAB SST0101AL038 SW1102 TACT SWITCH SKQSAB SST0101AL038 SW1103 TACT SWITCH SKQSAB SST0101AL038...
  • Page 57 Misuse of any trademarks or any other content in this manual is strictly prohibited. Funai shall aggressively enforce its intellectual property rights to the fullest extent of the law. LC155SL8 A7120UH 2007-01-25...

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