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Digital TV box lost picture

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Discussion in 'Troubleshooting and Repair' started by davidxyz, Jan 18, 2014.

  1. Jan 18, 2014 #1
    davidxyz

    davidxyz

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    0
    Jan 18, 2014
    I have a digital TV box in the UK that stopped outputting a picture through the HDMI and SCART ports. If I leave the box off for a week, the picture works for about one minute and then goes off again. If I switch it on after a day, it won't work. But leaving it off for a long time (weeks) makes it come back on briefly. What component would cause this behavior?
     
  2. Jan 18, 2014 #2
    davenn

    davenn Moderator

    13,246
    1,745
    Sep 5, 2009
    check particularly in the power supply section for electrolytic capacitors that have bulging tops
    I have had 3 settop boxes fail that way

    cheers
    Dave
     
  3. Jan 18, 2014 #3
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,689
    Jan 21, 2010
    The first thing I'd look for is swollen or ruptured capacitors in the power supply.

    The problem may be caused by ripple on the power supply which affects this part of the unit before affecting other parts.

    It's also a relatively simple thing to look for and a pretty safe start.

    I you find anything, post some pictures.

    edit: *snap*
     
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