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Sony KV-27V36 has weird PIP issue.

Discussion in 'Electronic Repair' started by David Farber, Dec 11, 2012.

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  1. David Farber

    David Farber Guest

    This Sony KV-27V36 was working fine until about an hour ago. When I turned
    on the PIP, it initially looked fine. Then I did a few exchanges of channels
    from the small window to the big window. I noticed the smaller window was
    showing just static. I thought the cable had gone out for that station
    because the larger window was still showing a clear picture. I hit the
    switch button again and the problem still stayed with the smaller window. So
    now I know that it's not the cable. There are only two choices in the setup
    menu (not talking about the service menu) for cable channel select. They are
    "on" or "off" and it's set to "on." To summarize, all the channels work
    properly when the PIP is not active or if the PIP is active and you're
    looking at the larger window. The smaller PIP window will work fine until
    you reach channel 48. From channel 49 and above, it's all static. I'm fairly
    certain that the way the two tuners operate is that they each stay on the
    same station when you hit the switch button. All that changes is where the
    pictures are displayed. Is that correct? If not, it would make sense that
    one of the tuners is having tuning issues though I'm not sure what's so
    special about channels 48 and above. The information I've researched doesn't
    show those two channels (48 and 49) are situated on different bands. Any
    ideas?

    Thanks for your reply.
     
  2. I would say it is the tuner itself. Might respond favorably to
    resoldering...

    Used to see lots of problems like this.

    Mark Z.
     
  3. John-Del

    John-Del Guest

    On Tuesday, December 11, 2012 4:10:49 AM UTC-5, David Farber wrote:
    I hit the
    The Sonys of that era used two tuners for main and pip, but didn't swap thevideo between large and small windows, but swapped the channel instructions for each tuner as the swap button was pushed. That's why the problem stays with the particular screen window.

    Those tuners were combo tuner and IF, and are known to have issues with grounds and bad connections on coils. You can replace the pip tuner if you can find one, or pull it and resolder. Some of those TVs in that era used double sided boards, and require a decent technique to pull the tuner (green boards). If it has the brown board, it's an easy pull. BTW, although the tuners look identical but they're not, so make sure to identify the correctone by pulling the RF input lead off each tuner to confirm the pip goes tosnow.
     
  4. David Farber

    David Farber Guest

    Hi Mark,

    Here I thought I would never again have the pleasure of resoldering a Sony
    tuner/IF module. (-:

    Thanks for your reply.
     
  5. David Farber

    David Farber Guest

    Hi John,

    Knowing that the channel instructions are swapped instead of the tuners does
    make this job easier. I'll be sure to mark the bad one before I pull it.

    Thanks for your reply.
     
  6. David Farber

    David Farber Guest

    I pulled out the tuner and resoldered it. There was nothing out of the
    ordinary that I saw. A few of the connections were beginning to crack but
    nothing I saw that would have caused a failure. Anyway, I put it all back
    together and it's still going to snow at channels 48 and above.
     
  7. John-Del

    John-Del Guest

    The connections that give the most trouble are the grounds both around the board perimeter, and the posts that poke through the pc. There's not a lotof ground redundancy in those tuners, so a single ground connection will cause problems. Deflux the board till it shines, get a bright light, use magnification, and reflow the board again. Don't overlook the small can coilconnections.
     
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