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Sharp 13SB50 tv

Discussion in 'Electronic Repair' started by Wayne Tiffany, Jan 9, 2006.

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  1. I have finally picked this one up again.

    Short version - no response to a remote control and the TV itself doesn't
    have controls to change channel, volume, etc. It does power up, but is
    stuck on channel 2, so nothing but snow on the screen.

    I have traced a 200+Hz signal from the IR receptor to pin 19 of an IC when
    using the remote. The chip is:

    X1674CE 761

    But I can't seem to find a datasheet on this chip to try to figure out its
    output. Does anyone have any info that might help me? Or am I missing
    something obvious? The fact that the owner said both remotes that she gave
    me used to work just fine on the TV, and then they both quit operating it
    leads me to think that the problem is not with the remotes.

  2. b

    b Guest

    Wayne Tiffany ha escrito:
    before jumping in there let's start with the simple.
    Get a crappy portable Am radio or use a clock radio-alarm for example.
    detune it. put fresh batteries in the remotes and see if you get some
    bleeps when you press the remote next to the radio. that ought to help
    eliminate the remotes - if you hear sound they're probably emitting ok
    ( the frequency may have drifted, tho' i only saw this happen once in
    10 years!). report findings please.
  3. I will try it - thanks. But I also figured that if, as stated, I am seeing
    the 200+Hz pulse output going from the IR receptor to the chip, that should
    be evidence enough that the remote is outputting, and also that the receptor
    is seeing it and responding. Is this not correct?

  4. Ok, tried the radio check and both remotes have beating hearts. Next
    thoughts? Anyone run across a datasheet for that chip?

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