16 Jun
2013
16 Jun
'13
6:07 p.m.
On 06/16/2013 07:24 PM, Fred Cisin wrote:
> How many people here would buy an untested board
for more than scrap value?
Very dependent on price. reason is even if the board is bad it may
yield scarce parts.
One inspection that helps make the difference is if things are burnt
(sign of over voltage).
I have done this many times with DEC Qbus boardsand had success
repairing them
or got enough needed unique parts to make that worth while.
Allison
There was a time, when I was young, and dinosaurs did
not yet roam
the earth, . . .
when "untested" meant UNTESTED. There was a very high probability
that it worked. No reason not to take a chance on it.
You could buy a memory board, and it was likely to work.
THEN, you could buy a memory board, replace a few chips and have it work.
THEN, you could buy a memory board, and the seller would have populated it
with every bad chip that they could find.
Then, the seller would replace chips to find working ones, and assemble
the boards that tested bad with the chips that tested bad.
NOW, "untested" is a LIE; it means TESTED, known to be bad, and
beyond the repair capabilities of whoever tested it.
If you are skilled at making repairs, it is still potentially
a reasonable deal for the board on which to rebuild the circuit.
But now, you can assume that others have failed before you, and
that one or more of the most expensive LSICs that came with it are bad.
--
Grumpy Ol' Fred cisin at xenosoft.com
--
Grumpy Ol' Fred cisin at xenosoft.com