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Philips TV model 20GR1055/75R : fuse blown and no shorts.

Discussion in 'Electronic Repair' started by AliTonto, Sep 13, 2004.

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  1. AliTonto

    AliTonto Guest

    Anyone has knowledge of this situatuion?

    TV dead; I found main fuse blown (glass not darkened); No shorted
    components can be found, only the following can be seen under the
    circuit board:
    the first small transformer off the fuse has one pin (primaty side)
    without any solder; it looks as if the solder has been blown clean
    right off the board; the area on the board around this pin is covered
    with a silvery coloured burn mark (not a normal blackened burn mark).
    Test done:I found no shorted components anywhere; the 3 legged positor
    has resistances between all its pins as well as the transformer
    itself.

    I am suspecting that there was a faulty solder joint on the that pin
    which suddenly caused some sort of powerfull arcing and caused the
    fuse to blow.
    Has anyone experienced this before or able to confirm my thinking?

    Please share any similar experiences.
    Thanks
    Ali
     
  2. James Sweet

    James Sweet Guest

    It's entirely possible. Resolder it, install a new fuse, and see what
    happens, if it blows again you know something is wrong.
     
  3. Fulcro

    Fulcro Guest

    Try to power the set with the lamp in series, and I'll be sure if really
    there are no short!
     
  4. Replace degausing element (a black or white 3-legged "box") in primary of
    power supply.

    Rudolf
     
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