kevin@ucrmath.UCR.EDU (kevin lund) (12/10/89)
I have a really ancient mac (originally 128K) and, over the years, the
analog board has required no more than an occasional resolderning. Until
now...
The symptoms are: no video (not so much as a measly dot in the middle),
sound is corrupted (a buzz instead of a bong when it comes on, and when
reset...so I guess it's supplying power ok), and not much else (won't boot).
There is a big fat transistor (Q3 I believe; it's at the top and has a big
heat sink on it) which gets extremely hot and, with the power off, has no
appreciable resistance though any pairs of it's legs (bad sign if I don't
miss by guess).
So, does anybody have any idea what the problem is? I could always
try replacing the transistor but maybe it was wrecked by something
else...is all else fails, where can I get a new board, cheap?
thanks
kevin kevin@ucrmath.ucr.edu