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Trouble shooting for dv3250lcd display

No picture nosound no raster only on screen display working

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  • Anonymous Feb 22, 2008

    no sound

  • Anonymous Jan 10, 2009

    same thing



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Yes, i agree with the Shuttle83. If you need the free schematic diagram or service manual, please feel free to go to the http://www.fastrepairguide.com to get it.

Posted on Jan 20, 2008

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Hello raj ro,

The problem you have described is a possible problem in the RF/IF section before the video and audio are separated. I would check the tuner, and the signal into the IF/Video/Audio Processor. I say this because in most televisions now the IF, Video, and Audio are preprocessed through the same microprocessor with input from the tuner or some sort of amplifier after the tuner. Check the output of the processor to the various stages Video, Audio, Sync, etc. In addition to this check the DC bias voltages, and the signal waveforms on the processor also. This should lead you down the right path of solving this problem.

You will need:

  • a schematic diagram of the TV (To locate test points and signal)
  • a Digital Multimeter (To measure DC volts and test passive components)
  • an Oscilloscope (To measure waveforms)
  • a signal generator (To provide proper reference signals)
  • an Isolation AC power supply (To prevent shorting out the test equipment while testing the TV set)
These are the basic pieces of test equipment needed to do this type of troubleshooting.

If you do not feel you can do this please contact a qualified TV repair person to troubleshoot this problem.


I hope this helps
Thank you,
Shuttle83

Posted on Jan 20, 2008

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