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Sylvania LD155SC8 Service Manual Supplement

15" lcd tv/dvd
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SUPPLEMENT
SERVICE MANUAL
This service manual shows only the differences between
the model LD155SC8 and the original model LD155SL8.
All other information is described in the service manual
of the model LD155SL8.
15" LCD TV/DVD
LD155SC8
HIGH-DEFINITION TELEVISION
HIGH-DEFINITION TELEVISION

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  • Page 1 SUPPLEMENT SERVICE MANUAL This service manual shows only the differences between the model LD155SC8 and the original model LD155SL8. All other information is described in the service manual of the model LD155SL8. 15″ LCD TV/DVD LD155SC8 HIGH-DEFINITION TELEVISION HIGH-DEFINITION TELEVISION...
  • Page 2 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. LD155SC8 A7421UH 2007-03-15...
  • Page 3 SERVICE MANUAL 15″ LCD TV/DVD LD155SL8...
  • Page 4 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 5: Table Of Contents

    TABLE OF CONTENTS Specifications ................1-1 Laser Beam Safety Precautions .

  • Page 6: Specifications

    SPECIFICATIONS < LCD TV Section > < 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 <...
  • Page 7 < 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 8 <DVD Section> < DVD > Description Condition Unit Nominal Limit 1. Horizontal Resolution (TDV-540 TIT.2 CHP.16) Line 2. Video S/N at CN3400 (TDV-540 TIT.2 CHP.6) 3. S/N Chroma (TDV-540 TIT.2 CHP.17) 4. Audio Distortion (LPCM 48 kHz, W/LPF) 0.03 0.07 (PTD 1-NOR TIT.1 CHP.1) L, 20 Hz 5.

  • Page 9: Laser Beam Safety Precautions

    LASER BEAM SAFETY PRECAUTIONS This DVD player uses a pickup that emits a laser beam. Do not look directly at the laser beam coming from the pickup or allow it to strike against your skin. The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 30 cm away from the pickup lens when the diode is turned on.

  • Page 10: 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 11 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 12 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 13 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 14: Standard Notes For Servicing

    STANDARD NOTES FOR SERVICING Circuit Board Indications Pb (Lead) Free Solder 1. The output pin of the 3 pin Regulator ICs is Pb free mark will be found on PCBs which use Pb indicated as shown. free solder. (Refer to figure.) For PCBs with Pb free mark, be sure to use Pb free solder.
  • Page 15 around the flat pack-IC to protect other parts from With Soldering Iron: damage. (Fig. S-1-2) 1. Using desoldering braid, remove the solder from 3. The flat pack-IC on the CBA is affixed with glue, so all pins of the flat pack-IC. When you use solder be careful not to break or damage the foil of each flux which is applied to all pins of the flat pack-IC, pin or the solder lands under the IC when...
  • Page 16 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 17 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 18: 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 19 Reference Notes Note: (1) Order of steps in procedure. When reassembling, 1. CAUTION 1: Electrostatic breakdown of the laser follow the steps in reverse order. These numbers diode in the optical system block may occur as a are also used as the Identification (location) No. of potential difference caused by electrostatic charge parts in figures.
  • Page 20 (S-4) (S-3) [3] Rear Cabinet (S-3) (S-1) (S-3) (S-3) (S-1) (S-3) [2] Stand Cover [1] Arm Assembly (S-2) Fig. D1 A7420DC...
  • Page 21 [6] DVD Holder(Top) (S-7) [5] DVD Mechanism (S-7) (S-6) [7] DVD Holder(Bottom) (S-8) (S-5) (S-6) [4] DVD Main CBA Unit Remove two screws A, then short the three short lands by soldering as shown in View for A. Chassis Cover Screws A Pin A Either of two places...
  • Page 22 [10] Main CBA [8] Jack Holder (S-10) (S-10) Module PCB Holder (S-9) [9] DTV Module CBA Unit (S-10) Fig. D3 A7420DC...
  • Page 23 [13] LDVS CBA (S-14) (S-13) (S-12) (S-13) [14] LCD Module (S-12) (S-12) (S-13) (S-12) (S-13) [12] LCD Holder (S-12) (S-11) [11] Tilt Stand Holder Fig. D4 A7420DC...
  • Page 24 [20] Front Cabinet (S-15) [18] Junction-B Speaker [15] Function Holder (S-15) (S-17) (S-15) Desolder [19] Speaker Speaker (S-16) Holder [16] IR Sensor Desolder [19] Speaker (S-17) Speaker Holder [17] Junction-A Fig. D5 A7420DC...
  • Page 25 TV Cable Wiring Diagram To DVD Mechanism DVD Main To LCD Module Function CBA CBA Unit CL1107 CN201 CN301 CN801 CN1402 CN1401 CN601 CN401 CN1411 LVDS CBA Unit Main CBA CN1301 CN1201 CN1202 CN401 CN1701 Module CN403 CN1651 Junction-A CN62 CN61 CL801 CN801...

  • Page 26: 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 27 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 28 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 29: How To Initialize The Lcd Tv/Dvd

    HOW TO INITIALIZE THE LCD TV/DVD To put the program back at the factory-default, initialize the LCD TV/DVD as the following procedure. < DVD Section > < LCD TV Section > 1. Press [1], [2], [3], [4], and [DISPLAY] buttons on the 1.

  • Page 30: Firmware Renewal Mode

    FIRMWARE RENEWAL MODE 1. Turn the power on and press [EJECT] button on the 5. After programming is finished, the disc will be remote control unit to put the LCD TV/DVD into ejected automatically. Fig. e appears on the screen DVD mode.

  • Page 31: Block Diagrams

    BLOCK DIAGRAMS < LCD TV SECTION > System Control Block Diagram A7420BLS...
  • Page 32 IF/Video Block Diagram A7420BLIF...
  • Page 33 Audio Block Diagram A7420BLA...
  • Page 34 DTV Module Block Diagram A7420BLDTV...
  • Page 35 LCD Block Diagram A7420BLLCD...
  • Page 36 Power Supply Block Diagram A7420BLP...
  • Page 37 LCD Backlight Block Diagram A7420BLLB...
  • Page 38 BLOCK DIAGRAMS < DVD SECTION > System Control / Servo Block Diagram A7420BLSD...
  • Page 39 Digital Signal Process Block Diagram A7420BLD...

  • Page 40: 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 41 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 42 Main 1/6 Schematic Diagram < LCD TV Section > VOLTAGE CHART CN1201 Pin No. Voltage CN1202 Pin No. Voltage 10-3 A7420SCM1...
  • Page 43 Main 2/6 Schematic Diagram < LCD TV Section > VOLTAGE CHART CN61 Pin No. Voltage CN62 Pin No. Voltage 10-4 A7420SCM2...
  • Page 44 Main 3/6, Junction-A & Junction-B Schematic Diagram < LCD TV Section > A7420SCM3 10-5...
  • Page 45 Main 4/6 Schematic Diagram < LCD TV Section > 10-6 A7420SCM4...
  • Page 46 Main 5/6 Schematic Diagram < LCD TV Section > 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 47 Main 6/6 Schematic Diagram < LCD TV Section > 10-8 A7420SCM6...
  • Page 48 Function Schematic Diagram < LCD TV Section > A7420SCF 10-9...
  • Page 49 IR Sensor Schematic Diagram < LCD TV Section > A7420SCIR 10-10...
  • Page 50 LVDS Schematic Diagram < LCD TV Section > A7420SCLV 10-11...
  • Page 51 DTV Module 1/2 Schematic Diagram < LCD TV Section > 10-12 A7420SCDT1...
  • Page 52 DTV Module 2/2 Schematic Diagram < LCD TV Section > 10-13 A7420SCDT2...
  • Page 53 DVD Main 1/3 Schematic Diagram < DVD Section > 1 NOTE: Either IC461 or IC462 is used for DVD MAIN CBA UNIT. A7420SCD1 10-14...
  • Page 54 DVD Main 2/3 Schematic Diagram < DVD Section > 10-15 A7420SCD2...
  • Page 55 DVD Main 3/3 Schematic Diagram < DVD Section > 10-16 A7420SCD3...
  • Page 56 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 57 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 58 Function CBA Top View IR Sensor CBA IR Sensor CBA Top View Bottom View BA7420F01021-2 Junction-A CBA Top & Bottom View Function CBA Bottom View BA7420F01021-3 Junction-B CBA Top & Bottom View BA7420F01021-4 BA7420F01021-1 10-19...

  • Page 59: Waveforms

    WAVEFORMS < LCD TV SECTION > 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...
  • Page 60 WAVEFORMS < DVD SECTION > WF8 ~ WF12 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: NTSC Color Bar Signal (with 1kHz Audio Signal) DVD Video (Power on (Stop) MODE) Pin 1 of CN1701 Pin 7 of CN1701 WF11 DVD-AUDIO(R)

  • Page 61: Wiring Diagram

    WIRING DIAGRAM < LCD TV SECTION > 12-1 A7420WI...
  • Page 62 WIRING DIAGRAM < DVD SECTION > DVD-ON+5V 20 CD/DVD 19 D 18 A 17 DVD-Y C 16 B 15 DVD-C NU 14 VREF 13 DVD-AUDIO(L) NU 12 DVD-MUTE GND 11 DVD-AUDIO(R) CD-LD 10 AUDIO-GND GND(LD) 9 DVD-SPDIF DVD-LD 8 PD-MONI 7 GND(DVD-PD) 6 GND(CD-PD) 5 TS(-) 4...

  • Page 63: System Control Timing Charts

    SYSTEM CONTROL TIMING CHARTS Disc In ~ Play/Play ~ Disc Out Disc Disc Disc Disc Play Rotation Stop 3.3V Disc IN (TL221) 1.65V Sled Drive (TP303) 1.65V Disc Drive (TP301) 1.65V Focus Drive (TP304) Tracking Drive 1.65V (TP302) 13-1 A7420TI...

  • Page 64: 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 65 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 66: Lead Identifications

    LEAD IDENTIFICATIONS KIA7805API/P KTA1281Y-AT/P 2SA1175(F) 2SA950-Y(TE2 F T) KTC3199-GR-AT/P 2SC2120-Y(TE2 F T) 1: IN 2: GND 3: OUT 1 2 3 E C B E C B 2SK3563(Q) LD1117V TC4053BF(EL N F) TC4052BF(ELNF) AN5832SA-E1V 1: Vin 2: Vo 3: GND 1 2 3 G D S AN17812A...

  • Page 67: Exploded Views

    EXPLODED VIEWS Cabinet Junction-B CBA SP802 Function CBA CL1411 LVDS CBA Unit IR Sensor CBA SP801 LCD-1 CL1401 Junction-A CBA CL1402 CL1651 L3-10 See Electrical Parts List CL1701 for parts with this mark. Main CBA DVD Main CBA Unit DTV Module CBA Unit AC601 16-1 A7420CEX...
  • Page 68 Packing Some Ref. Numbers are not in sequence. Packing Tape Tape Packing Tape Packing Tape Packing Tape 16-2 A7420PEX...

  • Page 69: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. STYROFOAM TOP A7420UH 1EM021670 Before replacing any of these components, read STYROFOAM BOTTOM A7420UH 1EM021675 carefully the product safety notice in this service SET BAG L0110UA 0EM301908 manual.

  • Page 70: 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 .(1608) B K 1000pF/50V CHD1JK30B102 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 ELECTROLYTIC CAP .
  • Page 71 Ref. No. Description Part No. Ref. No. Description Part No. C812 CHIP CERAMIC CAP . F Z 1µF/10V CHD1AZ30F105 C1230 ELECTROLYTIC CAP . 47µF/10V M H7 CE1AMAVSL470 C813 CHIP CERAMIC CAP . F Z 1µF/10V CHD1AZ30F105 C1231 ELECTROLYTIC CAP . 47µF/10V M H7 CE1AMAVSL470 C818 ELECTROLYTIC CAP .
  • Page 72 Ref. No. Description Part No. Ref. No. Description Part No. CN403 CONNECTOR PRINT OSU C/02/R/S02(8.0)B- J3BH020JG001 D910 DIODE 1ZC43(Q) QDLZ001ZC43Q D911 SCHOTTKY BARRIER DIODE SB240-B/P NDQZ000SB240 CN1201 FMN CONNECTOR SIDE 33P 33FMN-STRK- JCFNG33JG022 D912 RECTIFIER DIODE 1N4005 NDQZ001N4005 A(LF)(SN) D913 DIODE FR104-B NDLZ000FR104 CN1202...
  • Page 73 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W 0 Ω PCB JUMPER D0.6-P5.0 JW5.0T RRXAZR5Z0000 CHIP RES. 1/10W J 270k Ω INDUCTOR 18µH-J-26T LLAXJATTU180 RRXAJR5Z0274 CHIP RES. 1/10W J 2.2k Ω PCB JUMPER D0.6-P5.0 JW5.0T RRXAJR5Z0222 CHIP RES.
  • Page 74 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 10k Ω CARBON RES. 1/4W J 100k Ω R472 RRXAJR5Z0103 R826 RCX4JATZ0104 CHIP RES. 1/10W J 10k Ω CHIP RES. 1/10W J 100k Ω R473 RRXAJR5Z0103 R827 RRXAJR5Z0104 CHIP RES.
  • Page 75 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 470 Ω CHIP RES. 1/10W J 33 Ω R952 RCX4JATZ0471 R1225 RRXAJR5Z0330 CHIP RES. 1/10W J 47k Ω CHIP RES. 1/10W J 33 Ω R953 RRXAJR5Z0473 R1226 RRXAJR5Z0330 CARBON RES.
  • Page 76 ANALOG KEY CBA Ref. No. Description Part No. CHIP RES. 1/10W J 1k Ω R1706 RRXAJR5Z0102 Ref. No. Description Part No. CHIP RES. 1/10W J 1k Ω R1707 RRXAJR5Z0102 ANALOG KEY CBA 1ESA14015 CHIP RES. 1/10W J 75 Ω R1709 RRXAJR5Z0750 Consists of the following: CARBON RES.
  • Page 77 JUNCTION-A CBA Ref. No. Description Part No. JUNCTION-A CBA ---------- Consists of the following: MISCELLANEOUS CL801 WIRE ASSY 2PIN SPEAKER 2PIN/180MM WX1A7120-008 JUNCTION-B CBA Ref. No. Description Part No. JUNCTION-B CBA ---------- Consists of the following: MISCELLANEOUS CL802 WIRE ASSY 2PIN SPEAKER 2PIN/180MM WX1A7120-008 20070206 18-8...
  • Page 78 © 2007 Funai Electric Co., Ltd. All rights reserved. No part of this manual may be reproduced, copied, transmitted, disseminated, transcribed, downloaded or stored in any storage medium, in any form or for any purpose without the express prior written consent of Funai.

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