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Sony 27" s-video problem

Discussion in 'Electronic Repair' started by Mark, Dec 28, 2003.

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  1. Mark

    Mark Guest

    I have a 27" Sony tv which I think has a cold solder joint. I got it in
    1997. For about a year, the s-video connection has been extra sensitive
    to movement. If you touch the cable, it will go from no picture, to
    black and white, and if you pull on the cable a little in one direction,
    it will go back to normal. I was able to "bandaid" the problem by
    pulling the cable with some tape...

    Just this week, it's got worse. The screen is blank unless the connector
    is held "just right" and any small vibration in the room will cause it
    to lose a picture. (I also tried different svideo cables)

    I took the back cover off the tv and I was wondering if I heat the
    "legs" that are connected to the PCB, should this fix the problem. It's
    impossible for me to get at the front of the PCB to resolder the joints,
    I could only reheat from the back where the connector legs go through
    the board which is soldered.

    The tv is still working perfect with composite and RF connections.

    Does this sound like a cold solder joint on the s-video pins/legs?
    Thanks for reading!

    -Mark
     
  2. The connections can only be resoledered from the circuit board side.

    Mark Z.
     
  3. I have a 27" Sony tv which I think has a cold solder joint. I got it in
    Simple fix, but it will require you to remove the back cover of the TV set. It
    will also require proficiency with soldering to properly perform the fix.

    What you would have to do is find the soldering leads that connect the s-video
    connector to the mainboard. Then you carefully remove the old solder from the
    joint using the iron and desoldering braid, make sure the solder pads on the
    board are clean, then reflow the joint with fresh solder. Make sure the solder
    is the correct type and of decent quality. I've used the RadioShack silver
    bearing solder with fairly good results. - Reinhart
     
  4. Mark

    Mark Guest

    Hi, I was able to fix it by sticking a peice of plastic with electical
    tape on the tv cover. When the cover is screwed back on the tv, the
    peice of plastic pushes against the svideo board which fixes it.

    With the back off, and plugged in, I found out that by pressing against
    the video board, the color would come back, so I tried the above fix.

    The reason I didn't attempt to resolder the bad joint, is because I
    found it too difficult to get in front of the PCB. Maybe I will try this
    once I safely know how to remove the board.

    -Mark
     
  5. Jim Adney

    Jim Adney Guest

    You might want to try another S-video cable first, just in case the
    problem is in the cable rather than the TV.

    Once you're sure that the problem is in the TV, the solder joint will
    have to be worked on from the solder side.

    -
     
  6. Hi, I was able to fix it by sticking a peice of plastic with electical
    This is not a fix, but a quick-fix that will only allow the problem to get
    worse, perhaps with unforseen consequences such as warpage or other damage to
    the component and/or even the mainboard itself.

    If the cable is not at fault, then it does sound like your set has cold solder
    joints.
    If you don't know how to fix it properly, then hire the services of a
    professional (or at least someone who knows what they're doing) who will
    perform the necessary repairs for you.
    You have to get *underneath* the board, not in front of it, if the problem is
    with cold solder joints. - Reinhart
     
  7. Mark

    Mark Guest

    Hello,

    (M) "Hi, I was able to fix it by sticking a peice of plastic with
    electical tape on the tv cover. When the cover is screwed back on the
    tv, the peice of plastic pushes against the svideo board which fixes
    it."

    (R) "This is not a fix, but a quick-fix that will only allow the problem
    to get worse, perhaps with unforseen consequences such as warpage or
    other damage to the component and/or even the mainboard itself."

    (M) I'll fix it properly if I had a guide, I'll get the sony service
    manual. It's not that I don't know how to solder, it's getting the board
    out without damaging anything or getting shocked.

    (R) "If the cable is not at fault, then it does sound like your set has
    cold solder joints."

    (M) Yes, I tried a different cable. I'm using a cheaper, not as stiff
    cable now.

    (R) "If you don't know how to fix it properly, then hire the services of
    a professional (or at least someone who knows what they're doing) who
    will perform the necessary repairs for you."

    (M) I'd rather learn how to take it apart, because I know two other
    people with Sony's with similar problems.

    (M) "The reason I didn't attempt to resolder the bad joint, is because I
    found it too difficult to get in front of the PCB."

    (R) "You have to get *underneath* the board, not in front of it, if the
    problem is with cold solder joints. - Reinhart"

    (M) The connector board is upright. Access to the board without removing
    the board is next to impossible, which is why I said "in front". If I
    had the board out laying flat, then you are correct, it would be
    underneath. Poor phrasing on my part.
     
  8. James Sweet

    James Sweet Guest

    It's not really that hard, just remove the screws and slide the chassis out,
    then you can unplug the cables and remove that board, or you could take it
    to a shop and likely get it fixed for ~$50, or find someone who's worked on
    TV's and see if they'll do it for a case of beer, I know I would if it were
    near me.
     
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