I've got a Lisa 2/5 with no external 5MB Widget with a faulty
component on the power supply motherboard. This little 1.5"x1.5"
blocky black thing with a yellow band on top that reeks like you
wouldn't believe. (Some cracking on the band is visible as well) Any
idea what component this is? If the modern equivalent is smaller, I
don't mind soldering wires to make up the distance... I haven't found
any Lisa board schematics explaining what components on the
motherboard are yet, but was hoping someone here knows?
I'm hoping this is the only hurdle left, the monitor seems crisp but
there is a garbled video signal (hopefully from the underperforming
power supply). Everything looks great, even 2 memory boards installed.
I just can't afford $200 for a 1.8A Lisa power supply, and want to
solder/replace the equivalent on the board.
Cheers,
-Ian
On Feb 21, 1:37 pm, Ray Arachelian <r...@arachelian.com> wrote:
> James MacPhail wrote:
> > The clicking PSU is either a short circuit or its voltage set too high.
>
> I've had that happen with one of my power supplies, and replacing the
> dead capacitors was the fix.
> But of course, the one with the I/O board battery leaks will have other
> issues. :-)
>
> Peter, if you happen to have a spare I/O board, that might help. If you
> do and there's no damage around the COPS421 chip, you should at least
> save that chip - VIAs and the Z8530 are far less rare, but the COP421
> are very difficult to find replacements for as the only sources will be
> other Lisa I/O boards. Obviously try to repair the board as best as you
> can.