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XOCECO LC30B1 Service Manual

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COLOR TELEVISION
LC30B1

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Summary of Contents for XOCECO LC30B1

  • Page 1 COLOR TELEVISION LC30B1...

  • Page 2: Table Of Contents

    CONTENT Safety instructions………………………………………………………………………..… Instructions on adjusting and testing…………………………….…….………………… Trouble shooting……………………………………………………….…………………… Method of software upgrading………..…………………………….………..…………. BLOCK DIAGRAM…………………………………………………………….…………… IC BLOCK DIAGRAM……………………………………………………………………….. Wiring diagram……………………………………………………………..……………..Serial NO. of parts…………………………………………………………………………….… Identification criteria for the bright spot and dark spot of the LCD screen………..…. Troubleshooting guide………………………………………………………………..…… Exploded views…………………………………………………………………………..…...

  • Page 3: Safety Instructions

    Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety instructions 1. Instructions 1.1 Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire 1.2 Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;...

  • Page 4: Instructions On Adjusting And Testing

    2.10.There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are damaged the screen would be unable to work and no way to get it repaired. 2.11.
  • Page 5 See Fig.1. Check if memory U16 has been FLASH written. Production of main board and TV board on the line. Adjusting and calibrating TV board Check the main board Check TV board Combined test for general assembly Connect to central signal source, check if various TV functions (station skipping, system identification, analog control etc) are normal and check if earphone and speaker output are normal Input VGA signal and check if display is normal in the state of PC and various functions (analog control, line/field center etc.
  • Page 6 6) Power for liquid crystal screen C159 anode 12 V±0.3 V 7) AD9883A power C410,C17 3.3 V±0.1 V c) Connect VGA line, small conversion board of RS232 electric level and PC set, then run the program for FLASH upgrading. Turn on the power adapter switch and then the indication lamp of infrared receiving board should be in off state.
  • Page 7 flakes, abnormal tremble, interfering patterns or shifting. Plug the earphone line into the earphone port and check to ensure that sound should be heard from both the left and right sound channels. 3.3 YPbPr port Press the video key of the remote control and switch the picture frame to the state of YPbPr.

  • Page 8: Trouble Shooting

    Trouble shooting Before servicing please check to find the possible causes of the troubles according to the table below. 1.Antenna: Picture is out of focus or jumping Bad status in signal receiving Maybe broadcast signal itself is not good Check if the outdoor antenna is disconnected. Check if the antenna is correctly oriented.
  • Page 9 2.TV set: Symptoms Possible cause Unable to switch the power on Check to see if the power plug has been inserted properly into the socket. No picture and sound Check to see if the power supply of liquid crystal TV has been switched on.

  • Page 10: Method Of Software Upgrading

    Blur picture Check if the antenna cable is correctly connected. Of if it has received the right video signal. No sound Check if the “mute” audio frequency setting is selected. Check if the sound volume is set to minimum. Make sure the earphone is not connected. Check if the cable connection is loose.
  • Page 11 Based on the computer features, set up the serial port(COM Port). Select corresponding serial port (if it’s unable to FLASH WRITE, change to another port). Baud is selected to be 115200. Then select Reset Target After Download. Click FLASH pushbutton, it’s ready to run. For other settings, please refer to the Fig.

  • Page 13: Block Diagram

    IC Block Diagram 1 PW113(N15) PW113 is the MCU of this TV set and is also its core chip. It communicates with various other chips by means of bus line 12. The work it performs includes picture scaling (SCALER), receiving of external control signals, sending of various control signals to corresponding signal processing chips so as to complete relevant functions.
  • Page 15 PW1230(N11) The major function of PW1230 is to convert the interlaced video signal into line-by-line video signal so that the picture is clearer and realer and the picture frame becomes finer and smoother. In addition to this conversion function PW1230 is capable of enhancing the image and can also be used to adjust the brightness and contrast of the channel.
  • Page 16 3 VPC3230(N10) The block diagram of VPC3230 is shown as below: In which: 71 pin CIN is signal input for S-VIDEO; 73 pin VIN2 is CVBS input for AV; 74 pinVIN3 is for TV signal input; 75 pinVIN4 is used for synchronous identification of YCRCB. Pins 5,4,6 are respectively used for YCBCR signal input.
  • Page 17 5 TDA7495(U601) The block diagram of TDA7495 is shown below. In which Pins 1,5 are for input of left and right sound channels. Pin 9 is control pin when STBY (valid when it is of low electric level). Pin 10 is control pin for MUTE (valid when it is of high electric level). Pin 13 is power supply pin for IC (24V).
  • Page 18 7 MSP3450(U5) MSP3450 is an audio processing chip. It has four pairs of audio input ports, which are respectively TV , PC-AUDIO, HD-R HD-L, AV-R AV-L. The four groups of inputs connected through bus line 12 to PW113 , which control the audio signal corresponding to the output according to different SOURCES. 8 AD9883(N6)
  • Page 19 9 K4S641632C(N12) 10 DS90C383A(N16) D S 90C 383A / D S 90C F 383A...
  • Page 20 11 Z86129 (N8)
  • Page 21 12 LVC16244(N13 N14) 13 PI5330(N1) 14 74LV126(N4)

  • Page 23: Serial No. Of Parts

    Serial No. of Parts 667-L30B1-83 Signal processing board 667-L30B1-15 Amplifier board 667-L30B1-40 TV board 667-L30B1-09 Remote sensor board 667-L32B1-05 Key board 302-L30B1-01 Power adapter board 535-L30B1-01 Wall mounting parts Identification criteria for the bright spot and dark spot of the LCD screen Q’ty allowed Distance between two spots Category...

  • Page 24: Troubleshooting Guide

    TROUBLESHOOTING GUIDE NO RASTER Check whether Indicator whether N25 Pin 7 is high Replace N25 light level test X17 pin 1 and 2 and check Replace whether the voltage is 12V and adapter Check whether N17 pin Replace 5 the voltage 12V Check 9.10.11.12.16.17.1 Replace PANEL...
  • Page 25 NO PICTURE( HAVE RASTER) Fault 1.VGA and YPBPR no picture Check waveform Check R21 R131 Replace N6 AD9883 pin waveform Replace N1 PI5V330 Check Replace waveform DS90C383A Check N15 pin 170 waveform Replace G2 Replace N15 PW113...
  • Page 26 Fault 2. AV S-VIDEO and YCBCR no picture Check Check N11 pin62 Replace G1 R57 pin waveform waveform Replace N10 Check R64 R65 Check N16 pin40 Replace G3 R66 pin waveform waveform Replace N11 Check R82 R89 waveform Replace N16 Check Replace G2 pin170 waveform...
  • Page 27 Fault 3. TV no picture Check pin2 Check fault 2 waveform Replace TV board NO SOUND Check X601 pin 1 Check U5 pin 24 Replace and 3 waveform and 25 waveform board Replace U26 Check whether Replace sound amplifer U601 pin13 board voltage 24V...

  • Page 28: Exploded Views

    EXPLODED VIEWS...
  • Page 29 NAME NAME Speaker’s front cover Stand base speaker screw Sound-leading part back cover board Speaker’s back cover screw Speaker connector parts of keys Front cabinet back cabinet LCD screen connecting frame Fixing frame LED column main board LCD panel main board frame Signal cable supporter...
  • Page 37 R516 R519 R517 R518 100n 100n LM358 L506 5V-1 16V 10u 5V-1 10uH A-out A-in B-out 0.1u MSP3450G B-in C509 A-in 0.1u 470p B-in AUDIO-OUT VIDEO-OUT C508 16V 100u TV-VIDEO 470p C501 0.1u C510 0.1u AV-OUT 0.1u 470p 4.7u 0.1u 5V-1 RESET L504...
  • Page 38 U601 TDA7495 X602 X601 L_OUT C604 C602 C606 16V 2.2u 16V 2.2u C617 IN_L L602 R602 25V 470u 0.1u 10uH C603 100n C615 C611 35V 470u R601 35V 470u R603 R604 R605 C612 L601 R_OUT C608 0.1u 10uH IN_R 25V 1u R606 C614 C616...

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