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Static issue with older TV

Discussion in 'Electronic Repair' started by Tim R., Jun 13, 2008.

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  1. Tim R.

    Tim R. Guest

    I have an old Zenith A1920W TV from 1984 that works great except for
    one small problem.

    When I first turn it on, I will get nothing but static on all
    channels, and then it will suddenly clear up and work fine. It will
    alternate between working and static for a little while and eventually
    work normally. After that I can watch for hours with no issues.

    Is it an overheating component? Or something expanding/contracting and
    making intermittent contact? If anyone can point me in the right
    direction I'd appreciate it.


    Tim
     
  2. PaPaPeng

    PaPaPeng Guest

    It is most likely a cold solder joint that is affected by heat. A
    good slap on the cabinet usually restores the video. Open up the
    cover and use a long wood dowel to move the cables around with the TV
    switched on. You might get lucky and the problem will appear. From
    there it is easy enough to trace the cable to where the cold solder
    joint is. Otherwise just reflow the solder on the pin connectors on
    the motherboard. This is faster and easier than trying to
    troubleshoot.
     
  3. hr(bob)

    hr(bob) Guest

    Trouble is, it may not be a cold solder joint to a connector, but ANY
    component that is soldered. Probing the entire board quickly when
    first turned on may find the problem area, but the OP will need to
    probe everything, not just in the vicinity of connectors..

    Bob Hofmann
     
  4. Chuck

    Chuck Guest


    The tuner in this set usually will have broken solder connections,
    particularly at the sockets where the wire bundles run back to the
    main board.. The shield on the tuner will need to be removed. I
    think it needs to be desoldered, resolder all socket pins, touch up
    poor ground connections and it should work ok. Chuck
     
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