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AV inputs broken picture

My problem is with a 29" Panasonic flatscreen CRT, quintrixF, bought in late 1999. I've just moved the TV to another room, there were no problems of any sort when it was in the old room. The problem is the picture, on all three AV inputs, it's jittery, with ghosting & interference patterns, occasionally black & white etc.. I've tried it with a DVD player, a Gamecube & a camcorder, so it's not the input device. I've checked that it's on the right picture system (PAL 50hz in this case), so it's not that. The picture also occasionally comes right for 5-30 seconds, but then goes back to the problems again.

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  • bdenni Apr 15, 2009

    I don't actually have a soldering Iron.
    The inputs have worked fine for the last ten years, and all three jacks, which are in two different places, all started being affected at the same time. It doesn't sound like a connection issue to me.

    After watching the interference patterns for some time now, I've noticed another symptom. It seems that for the first few minutes it can't work out what colour system the input signal is, then after that, the colour is good, but the patterns change to fluctuating static across the middle of the screen.

    Thanks for your response ^_^



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The first thing I would suspect is a bad ground connection at the input jacks. Try gaining access to that board and resoldering the jack connections.

Let me know if that resolves the problem.



Posted on Apr 15, 2009

  • ABRsvcs Apr 15, 2009

    Poor solder connections occur because of repeated heat/cold which occurs when the set is on and off over the years. This is a very common problem and could effect all inputs if the connection problem is between the "input board" and the rest of the set. The loss of color can be casue by the loss of the sync pulse which is possible if there is a bad ground side connection. Static in the picture is also a symptom of a bad ground.

    For a set of the age you describe, the first step is always to look for and repair any poor solder connections that exist. These connections will often work for years until disturbed by a mechanical change (moving the set for example).

    If you know someone that can assist you with soldering, look for any solder connections that appear grainy rather than shiny or have rings in the solder area and resolder them. That may resolve the problem. If not, then we will need to loof for defective capacitors in the video signal line.

    Plesae keep me posted.




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