The "Russian" Star Castle looks like badly misadjusted pots in the
LF13331 circuit.
Tantalum capacitors don't change much over time. But they CAN go leaky
and blow themselves up. And the older "wet slug" tantalums can cause
some nasty acid damage if they blow up. The "gum drop" type doesn't
have the acid problem.
MKDUD@aol.com wrote:
>
> Hello,
>
> I was able to get Star Casle up and running for about an hour. Then, the
> screen seemed to stretch upwards and went blank. Then, my -25 breaker went.
> After inspecting the display board, I noticed C4 was blown (2.2uf 35v tant).
> I am waiting for replacement caps to arrive.
> Would (or could) this cap take the -15v reg with it? Also, when
> they fail, could it kill my dac(s) or the LF13331? I have a Dick Smith ESR
> cap tester. I want to compare ratings of old Tant caps to new ones to see if
> older ones give any indication of dying. I'll post my results, but I have no
> idea if tant caps show any ESR changes when they are tired.
> I have one boardset that is working fine, the other seems to be in
> Russian, with very wierd looking vectors and garbled letters (see pic). Any
> idea what I should check on the "Russian" boardset? I know the problem is in
> the logic board, and not the monitor. I do not have a Cinematronics
> Excorcisor, but maybe somebody who does has seen this before? I do have an
> HP5004A and a CAT box, perhaps someone knows where I should be checking
> signatures?
> The other pics show C4 blown, and a wierd looking AMD Dac80. Has anyone
> used the AMD flavor of DAC80? I was told these are supposed to be stronger
> than the B/B DAC80.
> Here is a link to some pics showing the blown cap C4, the "russian" S.C.
> boardset, and the AMD DAC80.
>
> <A HREF="http://members.aol.com/mkdud/cinemon/russiansc.jpg">
> http://members.aol.com/mkdud/cinemon/russiansc.jpg</A>
>
> Any help would be appreciated!
>
> Thanks,
> Michael Kelley
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Received on Fri Mar 8 01:09:32 2002
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