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XOCECO LC-27R18 Service Manual

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LCD TELEVISION
LC-27R18
LC-32R18
America

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Summary of Contents for XOCECO LC-27R18

  • Page 1 LCD TELEVISION LC-27R18 LC-32R18 America...

  • Page 2: Table Of Contents

    CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………..…….… Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..……………………….………….……… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………..……………... Troubleshooting………………………………………………………………………..…… Schematic diagram …………………………………………………………………….….. APPENDIX-A: Main assembly list APPENDIX-B: Exploded view...

  • Page 3: Safety Precautions

    Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety precautions 1. Instructions Be sure to switch off the power supply before replacing or welding any components inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;...
  • Page 4 would be unable to work and no way to get it repaired. 2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.

  • Page 5: Alignment Instructions

    Alignment instructions 1. Test equipment PM5518 (Video signal generator) K-7253 (VGA signal generator) CA210 (White balancer) 2. The alignment flow chart (see below figure) Check DDC, HDCP KEY and FLASH Production of main board and analog board on the line. Check CPU board and analog board Combined test for general assembly Connect to central signal source;...
  • Page 6 button, then display the DOING, still the DOING disappear and turn off the unit. Note: option-1 and option-2 function as follows: Option-1 Option-2 Bit3 0: No memory function after power off for 10s 0:no signal noise wave of TV 1: memory function after power off for 10s 1:no signal blue screen of TV Bit2,1 00: STANDBY...
  • Page 7 Input the VG-848 TIME972(1080i/60Hz) and PATTERN976(64 GRAY & Color), enter the factory menu1, select the AUTO COLOR after, press the VOL+ button to select AUTO COLOR. 3.5 Other setting Separate Factory Menu 4, Factory Menu 5, Factory Menu 6, Factory Menu 7 adjustment as follows: Factory Menu 4 Factory Menu 6 Bright Max...

  • Page 8: Working Principle Analysis Of The Unit

    Working principle analysis of the unit The RF via integrative tuner TUNER1 after, the FBAS is generated. The FBAS, AV1/SVHS(SVHS priority) and AV2 and so on, its sent N7 (TVP5160) to switch selection and decode. The video is decoded and generates an AV output. The signal via N7 decode after, it sent 8-bit ITU-R656 format signal to N10 (FLI2310) non-interlaced processing.

  • Page 9: Block Diagram

    Block diagram Power_ON,IR,KeyA,KeyB,Led1,Led2 Hs Vs Hs Vs Mute,HP_SW,VGA_CAB,DVI_CAB SN74AHC14 EDID YUV/VGA,YUV_SW,YUV/USB 24C02 R G B RGB Switch R G B CBT3257C Y Pb/Cb Pr/Cr Y Pb/Cb Pr/Cr HDTV Switch HDTV Switch YPbPr 1 CBT3257C CBT3257C Frash/ROM YPbPr 2 YUV_SW YUV/USB Frame Buffer YUV/VGA EDID...

  • Page 10: Ic Block Diagram

    IC block diagram 1.MSP3420 The MSP 34x0G family of single-chip Multistandard Sound Processors covers the sound processing of all analog TV-Standards worldwide, as well as the NICAM digital sound standards. The full TV sound processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed on a single chip.
  • Page 11 Fig. 1–1: Simplified functional block diagram of the MSP 34x0G...
  • Page 12 2. TVP5160 The TVP5160 device is a high quality; digital video decoder that digitizes and decodes all popular baseband analog video formats into digital component video. The TVP5160 decoder supports the A/D conversion of component YPbPr and RGB (SCART) signals, as well as the A/D conversion and decoding of NTSC, PAL, and SECAM composite and S-Video into component YCbCr.
  • Page 13 INTERNAL BLOCK DIAGRAM:...
  • Page 14 3. TPA3008D2 The TPA3008D2 is a 10-W (per channel) efficient, class-D audio amplifier for driving bridged-tied stereo speakers. The TPA3008D2 can drive stereo speakers as low as 8. The high efficiency of the TPA3008D2 eliminates the need for external heatsinks when playing music. The gain of the amplifier is controlled by two gain select pins.
  • Page 15 4. MST3383MB The MST3383MB integrates the HDMI compliant receiver for enabling advanced digital display devices such as digital TVs, plasma displays, LCD TVs and projectors to receive and display. Compliant with the HDMI 1.0 specification, the MST3383MB enables consumer electronic devices to receive uncompressed, high quality, digital audio and video HD content over a single, low-cost HDMI cable.
  • Page 16 5.GM1601/GM1501 The gm1601H is a dual channel graphics and video processing IC for Liquid Crystal Display (LCD) monitors and televisions incorporating Picture in Picture, up to WUXGA output resolutions. The gm1601H provides all key IC functions required for image capture, processing and display timing control.
  • Page 17 6. FLI2310 The FLI230x and FLI2310 are highly integrated digital video format converters for DTV and DVD applications using patented deinterlacing and post processing algorithms from Faroudja Laboratories, coupled with highly flexible scaling, a wide variety of aspect ratio conversions, and other special video enhancing features to produce the highest quality image.
  • Page 18 and Subtitle Display Modes 6.8 TrueLife™ Enhancer Two dimensional, non-linear, luma and chroma video enhancer brings out details in the picture, producing a more life-like image. 6.9 Memory 32-bit wide SDRAM (i.e. one 2M x 32-bit, or two 1M x 16-bit) controller, up to 166 MHz operation, for external SDRAM INTERNAL BLOCK DIAGRAM:...

  • Page 19: Wiring Diagram

    Wiring diagram...

  • Page 20: Troubleshooting

    Trouble shooting 1. Fault clearance Before servicing please check to find the possible causes of the troubles according to the table below. 1.1 Antenna (signal): Picture is out of focus or jumping Bad status in signal receiving Poor signal Check if there are failures with the electrical connector or the antenna.
  • Page 21 signal types. Picture too bright and there is Check if the contrast setting is too high. distortion in the brightest area Possibly the output quality of DVD broadcaster is set too high. It maybe also due to improper terminal connection of the video frequency signal in a certain position of the system.
  • Page 22 2. Identification criteria for the bright spot and dark spot of the LCD screen Quantity allowed Distance between two spots Category Criteria 15" 20" 22" 30" 40" 15" 20" 22" 30" 40" One single ≤5 ≤2 ≤5 ≤2 ≤3 spot Bright ≥15mm spot...
  • Page 23 3. Troubleshooting guide 1. Without backlight In STANDBY, does LED red light Green Does LED flicker Check the LED Check the pin1 and pin3of No change color CN3 has +5V output Replace CPU board Check if the X21 (pin6 and pin7) of Check Replace supply the digital board...
  • Page 24 2. With backlight, without picture Does remote control and key of the unit Does not picture not operate? of all channel TV/VIDEO HDMI Which no picture Display OSD? YPBPR Enter the factory Does R223 and menu, Check the Check if C16 Check R216-R219 CLEAR...
  • Page 25 3. No sound Check if the pin2 of XA11 is 24V/18V? Which is high Check RA76 level for DA1, DA2, DA3 Check DA11 pin1 and pin2 of XA12 Is high level of 18V/24V? Check NA1(pin1) Check the Check pin3 speaker output 1, 2 or 3,4 Check supply power...

  • Page 37: Appendix-A: Main Assembly List

    APPENDIX-A: Main assembly list the unit No. part NO. Description 203-L27R180-10 301-CL37R7-090A RC-C09-0A remote control (INSIGNIA) 615-10559-02 Stand assy (DZ-2327) 615-20464-05 Bottom speaker assy 667-L26R18-20 Power board assy 667-L27R18-05A Button board assy 667-L27R18-09 Infrared receiving board assy 667-L27R18-46 Trans-connecting board assy 667-L27R18-53 Analog board assy 667-L27R18-56...

  • Page 38: Appendix-B: Exploded View

    APPENDIX-B: Exploded View(LC-27R18)
  • Page 39 PART LIST OF EXPLODED VIEW(LC-27R18) No. PART NO. DESCRIPTIONRE 742-30091-00 Line clasp 615-10559-00 Stand assy 808-10829-00 Bottom connecting cover 808-10835-00 Rear cabinet(left) 870-10276-00 Connecting piece of speaker box 808-10837-00 Side decorate cover 808-10836-00 transfer axis cover 808-10812-00 Power lead cover...
  • Page 40 APPENDIX-B: Exploded View(LC-32R18)
  • Page 41 PART LIST OF EXPLODED VIEW(LC-32R18) No. PART NO. DESCRIPTIONRE 808-20332-202 ACTIVE panel 780-G18L0-AW1 Front cover 870-30190-00 LED columnbracket 360-30042-00 Power switch 700-60256-00 LED column 700-60255-100 LED column Infrared receiving board assy Screen 615-10562-00 LCD screen fixed mount assy Power board assy Sound trans-connecting assy 870-10219-00 Mounting holder...
  • Page 42 603-L27(32)R180-10 Ver.1.0...

This manual is also suitable for:

Lc-32r18

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