Re: 2004 Zenith, looks like odd vertical problem. H20F50DT3
- From: "sofie" <sofie@xxxxxxxxxx>
- Date: Tue, 12 Jul 2005 13:54:30 -0700
David:
I had one here several months ago, not exactly the same symptoms you
described.... it turned out to be a leaky diode near the TDA8174.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
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<dkuhajda@xxxxxxxx> wrote in message
news:1121198628.318601.75210@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Board # 3141vmnp478, Zenith has listed as module level repair only.
>
> We bought over 40 of these last year and they are now out of warranty.
> During warranty approximately 50% of them failed with the same symptom:
> Bottom half of picture was stretched and distorted in two or three
> distinct bands with black lines of varying size. The odd part is the
> black lines get wider toward the right side of the screen.
>
> Have already esr checked all capacitors in the vertical and jungle ic.
> Jumped across all capacitors in vertical. The distortion is clearly
> visible in all the vertical waveforms, including the drive out of the
> jungle, but the jungle usually has a feedback line so it may or may not
> be the jungle or the output circuit.
>
> No service manual on hand. The information available is limited to the
> installers menu. We have tried to order and get a service manual out
> of Zenith for several months and it has not been forthcoming.
>
> Has anyone seen a similar odd vertical looking problem on the latest
> model Zenith/Goldstar sets and found the problem? If so what was it.
>
> TIA David
>
.
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