Recent content by ahahthunder

Yep, as soon as I read your post I checked those diodes and found DP3 to have failed. Replaced those and now the mac is back in working order!  :) Still undervoltage on cold starts, but as long as it works I'm happy. Thanks for the help!

I've  finished replacing every capacitor on the AB now and it did not seem to improve performance. After a few days of continued function (under-powered on cold starts, otherwise OK) the computer suddenly died. The hard drive, fan, and display show no signs of life. Using a multimeter, I've...

The burned solder joints in question here are actually original; I didn't do them. There's a gap cut out of the board here to really separate those two points. Maybe they expected something like this was possible in design. Could a condition cause over voltage here enough to arc like that?

Ok I think I found the problem. The protective paper on the AB has a burn mark and some solder is has soot on it. I'm touching the component where the short happened, but it seems like that paper is just shorting those two points. I'm going to go through with the cap replacement today. Is there...

I've heard the pop two times. Could a capacitor do that twice? Also, I've never heard of this 'safety capacitor' before; I am new here. Can you give/point me to some more information on this? Does it need replacing?

I'm repairing a classic. I've so far washed and replaced all capacitors on the logic board, and replaced a few on the analog board. The machine almost works fine except cold starts usually have horizontal lines on screen for the first minute or so. I assume this is due to the capacitors I've yet...

I got a Macintosh Classic in decent but non-working state. After washing and recapping the logic board it worked great. A few days later I've noticed what seems like the analog board failing. The computer turns on with wavy horizontal lines for a few minutes until the logic board comes on. Then...