Re: Electrolytic Caps in CBM equipment

From: Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de>
Date: Wed, 12 Sep 2012 18:03:57 +0200
Message-ID: <5050B26D.1070207@laosinh.s.bawue.de>
On 09/12/2012 03:39 PM, silverdr@wfmh.org.pl wrote:
>
> On 2012-09-08, at 15:45, Gerrit Heitsch wrote:
>
>> Otherwise... I had C90 got bad on a 250407. No capacity left at all, resulting in +12V for VIC and SID being only +8V. System worked, but I only got a b/w picture. That one was a light blue 407F/25V made by GRAND SONIC.
>
> I have one board that boots to B/W picture when "cold". After some time colour pops in. It also quite often hangs (after some seconds) when cold. With time it also becomes more reliable. Voltages on the regulators/stabilisers look good. Don't have scope at hand to have some more close look but maybe this rings a bell for someone?

Can you provide some extra information about the kind of board? Assy 
number, which voltages were checked and where...

Crashing and b/w picture suggests a problem with the clock generation or 
the VIC not getting +12V.

  Gerrit



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