Sylvania LC370SS9 Service Manual
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Sylvania LC370SS9 Service Manual

Sylvania LC370SS9 Service Manual

37″ color lcd television
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SERVICE MANUAL
37" COLOR LCD TELEVISION
LC370SS9

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Summary of Contents for Sylvania LC370SS9

  • Page 1 SERVICE MANUAL 37″ COLOR LCD TELEVISION LC370SS9...

  • 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 Ω 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. Description Condition Unit Nominal Limit 1. Audio Output Max Power Lch/Rch 10.0/10.0 9.0/9.0 ATSC 0dBfs 2. Audio Distortion (NTSC) 500mW: Lch/Rch 0.5/0.5 2.0/2.0 -6dB: Lch 70 to 10 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 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 [4] Rear Cabinet (S-4) (S-4) (S-6) (S-4) (S-4) (S-5) (S-6) (S-4) (S-1) (S-4) (S-4) [3] Stand Hinge [2] Stand Cover [1] Stand Base Plate (S-3) (S-2) (S-3) Fig. D1 A8AGADC...
  • Page 15 [9] Digital Main CBA Unit [8] Shield Box (S-13) (S-14) (S-11) (S-12) (S-14) (S-13) [6] Side Jack CBA [5] Jack Holder (A) (S-7) (S-8) (S-9) (S-15) (S-10) (S-9) [7] Shield (T) (S-15) [10] Power Supply CBA (S-15) Fig. D2 A8AGADC...
  • Page 16 [13] PCB Holder (L,R) (S-17) (S-18) (S-19) (S-17) [14] Stand Holder [11] Inverter CBA (S-16) [12] Junction-B CBA (S-16) (S-16) (S-16) Fig. D3 A8AGADC...
  • Page 17 [21] Front Cabinet [20] Speaker [15] LCD Module Assembly (S-23) [19] Speaker [20] Speaker Holder (L,R) (S-23) (S-23) [19] Speaker (S-23) Holder (L,R) Desolder [16] Junction-A (S-21) [17] IR Sensor (S-22) [18] Function (S-20) Fig. D4 A8AGADC...
  • Page 18 TV Cable Wiring Diagram To LCD Module To LCD Assembly Module Assembly Digital Main CBA Unit CL1000B CN1000 Side Jack Junction-B CN4501 CN4502 Inverter CBA CN751 CN3601 CN3701 CN3704 CN1050 CN1100 Power Supply CL1000A CN1150 CN301 CN302 CN303 CN501 CN1200 CN1901 CN1250 CN701...

  • 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 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. [CH o/p] Screen 1. Enter the Service mode. buttons 2. Each time pressing [7] button on the service M.
  • Page 21 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 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 A8AGABLS...
  • Page 24 Video Block Diagram A8AGABLV...
  • Page 25 Audio Block Diagram A8AGABLA...
  • Page 26 Digital Signal Process Block Diagram A8AGABLD...
  • Page 27 Inverter Block Diagram A8AGABLINV...
  • Page 28 Power Supply Block Diagram A8AGABLP...

  • Page 29: 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 30 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 31 Power Supply 1/3 Schematic Diagram NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal. A8AGASCP1...
  • Page 32 Power Supply 2/3 Schematic Diagram A8AGASCP2...
  • Page 33 Power Supply 3/3 & Side Jack Schematic Diagram A8AGASCP3...
  • Page 34 Inverter & Junction-B Schematic Diagram CAUTION ! NOTE: Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, The voltage for parts in hot circuit is measured using If Main Fuse (F1901) is blown , check to see that all components in the power supply replace only with same type 4 A, 125V fuse.
  • Page 35 Function Schematic Diagram A8AGASCF...
  • Page 36 IR Sensor & Junction-A Schematic Diagram A8AGASCIR...
  • Page 37 Digital Main 1/4 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into four and shown as IC3301 (1/4) ~ IC3301 (4/4) in this Digital Main Schematic Diagram Section. A8AGASCD1...
  • Page 38 Digital Main 2/4 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into four and shown as IC3301 (1/4) ~ IC3301 (4/4) in this Digital Main Schematic Diagram Section. 8-10 A8AGASCD2...
  • Page 39 Digital Main 3/4 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into four and shown as IC3301 (1/4) ~ IC3301 (4/4) in this Digital Main Schematic Diagram Section. 8-11 A8AGASCD3...
  • Page 40 Digital Main 4/4 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into four and shown as IC3301 (1/4) ~ IC3301 (4/4) in this Digital Main Schematic Diagram Section. A8AGASCD4 8-12...
  • Page 41 Power Supply 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 42 Power Supply 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 43 Inverter 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. Also, in order to have the ability to increase the input CAUTION ! : For continued protection against risk of fire, If Main Fuse (F1901) is blown , check to see that all components in the power supply...
  • Page 44 Inverter 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 (F1901) is blown , check to see that all components in the power supply...
  • Page 45 Function CBA Top View IR Sensor CBA Top View Function CBA Bottom View IR Sensor CBA Bottom View BA8AFFF01021-3 BA8AFFF01021-4 8-17...
  • Page 46 Side Jack CBA Top View Junction-A CBA Junction-A CBA Top View Bottom View BA8AFFF01021-5 Side Jack CBA Bottom View Junction-B CBA Junction-B CBA Top View Bottom View BA8AFFF01021-2 BA8AGAF01031 8-18...

  • Page 47: Waveforms

    WAVEFORMS WF1 ~ WF4 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: NTSC Color Bar Signal (with 1kHz Audio Signal) Pin 19 of CN303 Pin 23 of CN303 (VIDEO IN) (S-VIDEO IN) CVBS CVBS 0.2V 0.2V 20µs...

  • Page 48: Wiring Diagram

    WIRING DIAGRAM 10-1 A8AGAWI...

  • Page 49: Exploded Views

    EXPLODED VIEWS Cabinet Digital Main CBA Unit CL4502 CL4501 CL802 SP802 CL801 SP801 Side Jack CBA Junction-A CL3701 CL3704 IR Sensor CBA CL3601 LCD1 Function CBA Inverter CBA Junction-B CBA See Electrical Parts List for parts with this mark. Power Supply CBA AC1901 11-1 A8AGACEX...
  • Page 50 Packing Some Ref. Numbers are not in sequence. Packing Tape Tape Packing Tape Tape Packing Tape 11-2 A8AGAPEX...

  • Page 51: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. STAND BAG A71FCUH 1EM425338 Before replacing any of these components, read ACCESSORIES carefully the product safety notice in this service BAG POLYETHYLENE 235X365XT0.03 0EM408420A manual.

  • Page 52: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. C608 SAFTY CAP . 1000pF/250V KX CA2E102MR101 Before replacing any of these components, read C633 ELECTROLYTIC CAP . 470µF/25V M CE1EMASDL471 carefully the product safety notice in this service C634...
  • Page 53 Ref. No. Description Part No. Ref. No. Description Part No. C824 CHIP CERAMIC CAP .(1608) B K 0.47µF/10V CHD1AK30B474 D505 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 C825 CHIP CERAMIC CAP .(1608) B K 0.47µF/10V CHD1AK30B474 D506 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 C826 CHIP CERAMIC CAP .(1608) CH J 1000pF/50V CHD1JJ3CH102 D507 SWITCHING DIODE 1SS133(T-77)
  • Page 54 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 12k Ω CHIP INDUCTOR LK1608R22K-T LLACKB3TUR22 R646 RCX4JATZ0123 CHIP RES. 1/10W J 22k Ω L801 CHOKE COIL(22µH) LHL10NB220K LLARKGQTU220 R647 RRXAJR5Z0223 CHIP RES. 1/10W J 10k Ω L802 CHOKE COIL(22µH) LHL10NB220K LLARKGQTU220...
  • Page 55 SIDE JACK CBA Ref. No. Description Part No. CHIP RES. 1/10W J 22k Ω R7605 RRXAJR5Z0223 Ref. No. Description Part No. CHIP RES. 1/10W J 33k Ω R7613 RRXAJR5Z0333 SIDE JACK CBA(MPS-2) ---------- CHIP RES. 1/10W J 22k Ω R7614 RRXAJR5Z0223 Consists of the following: CHIP RES.
  • Page 56 Ref. No. Description Part No. Ref. No. Description Part No. C107 CHIP CERAMIC CAP .(1608) F Z 0.1µF/25V CHD1EZ30F104 C1041 ELECTROLYTIC CAP . 100µF/16V M CE1CMASDL101 DIODES C1044 CHIP CERAMIC CAP .(1608) B K 1µF/25V CHD1EK30B105 C1046 CHIP CERAMIC CAP .(1608) B K 1µF/25V CHD1EK30B105 D101 LED L-53HT...
  • Page 57 Ref. No. Description Part No. Ref. No. Description Part No. C1366 CHIP CERAMIC CAP . B K 2200pF/50V CHD1JK30B222 D1068 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 C1367 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 D1110 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 C1500 CHIP CERAMIC CAP .(1608) F Z 0.22µF/50V CHD1JZ30F224 D1111 SWITCHING DIODE 1SS133(T-77)
  • Page 58 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W F 5.1k Ω D1602 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 R1015 RRXAFR5H5101 CHIP RES. 1/10W J 1M Ω D1702 ZENER DIODE MTZJT-773.3B QDTB0MTZJ3R3 R1020 RRXAJR5Z0105 CHIP RES. 1/10W J 1 Ω D1901# DIODE GENERAL PURPOSE 1N5406-BU NDLZ1N5406BU...
  • Page 59 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 33 Ω CHIP RES. 1/10W J 100k Ω R1250 RRXAJR5Z0330 R1606 RRXAJR5Z0104 CHIP RES. 1/10W J 33 Ω CARBON RES. 1/4W J 10k Ω R1251 RRXAJR5Z0330 R1607 RCX4JATZ0103 CHIP RES.
  • Page 60 Ref. No. Description Part No. T1350# TRANS INVERTER HVT-162 LTZ3PZ0XB007 TM1901 EYELET TYPE D-1 0VM406868 TM1902 EYELET TYPE D-1 0VM406868 T1951# TRANS POWER 8728 LTT4PC0KT003 WT601 LEAD CLAMPER 1790256 JUNCTION-B CBA Ref. No. Description Part No. JUNCTION-B CBA ---------- Consists of the following: CONNECTOR CN1000 242 SERIES CONNECTOR TUC-P04X-B1 WHT...
  • Page 61 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. LC370SS9 A8AGAUH 2008-09-22...

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