Re: Electrolytic Caps in CBM equipment

From: Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de>
Date: Wed, 12 Sep 2012 18:37:43 +0200
Message-ID: <5050BA57.4030907@laosinh.s.bawue.de>
On 09/12/2012 06:14 PM, silverdr@wfmh.org.pl wrote:
>
> On 2012-09-12, at 18:03, 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...
>
> 250425 board. Voltages checked at regulators, VIC, SID, CPU and few other points for the "second" +5.

Still, if you have a matching one, you could replace C90 anyway. 
Otherwise, since it's a 250425... If you have one, try a different 8701.

  Gerrit



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