sigi502
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Jul 2, 2011, 8:56 PM
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Toshiba TZ55X71
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Hi Forum,
I have a problem with my TZ55X71 and I can't find a service manual, so I try it here.
The TV turns on, I have HV and sound, but no picture. When I turn the TV off, a horizontal line briefly flashes up. It's not exactly a line, it bulges out in the middle of the screen. I removed the front panel and turned the three colors up and I get the same line as I get when I turn the TV of. I have already checked all voltages on the power supply board and they are all within spec. Could this be a vertical deflection problem? If so, could someone give me some ideas how to verify this.
Thanks, Sigi
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. The input signal (waveform 3) looks about right, but the output (waveform 4) is definitely wrong. The amplitude of the spike is about half of what it should be and the ramp is really not there, it just goes down a little just at the end before the next spike occurs. The 35V are fine on both pins (3 and 6), and I've checked all discrete parts around the LA7833. Would that be an indication that the LA7833 is bust? I don't have one to test and have to order one, so I just want to make sure that the problem is not somewhere else.