[TechAssist] Re: KV-27S66 Power supply cycles - 2nd req
- From: "James M. Knoble" <jmk1938@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 11 Aug 2003 08:46:36 -0400
try turning the screen voltage down slightly
On Wed, 6 Aug 2003 09:51:20 -0400, Joel Jacobs wrote
> Hi techs,
> This power supply shuts down every few seconds then restarts. The power
> relay remains energized. I've changed the switching regulator IC,
> the SE135, the opto, checked all the electrolytics in the power
> supply and changed any that had even slight ESR. I've changed the
> electrolytic in the horiz drive circuit that could cause ovecurrent
> there. When it's running the picture looks fine. On the back there
> is a sticker 'chassis BA-4D'. The BA-4D pdf in the files area has
> inconsistencies in the power supply circuit and no voltages at all
> so it's not a lot of help. I've run it on the variac from 90 to
> about 135VAC with no change. I've tried unloading the supply
> slightly by un-plugging the CRT socket board and it still cycles.
> What is a good way to troubleshoot this circuit? How can I
> determine whether it's the voltage feedback or current limit circuit
> that's killing it? Anyone seen this before? Thanks much! Joel
> Jacobs Ohio Consumer Electronics Pickerington, Ohio 614-833-9696
>
>
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