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I can suggest a good cleaning of boards with IPA

I think that UE8 is the chip from Mac SE/30, I don't find it on logic board of my Classic II. So I ask for the equivalent chip on my Mac. Really I've replaced 2N3904 last night immediately after your answer, I taked it from an orphan A/B (I think is in good conditions), so I was very quick :)

Unfortunately the replacement of the transistor had no positive results :( Now I've search the equivalent of SE/30 UE8 chip for reflux the solder point 

Hi, I've a similar problem with a Macintosh Classic II. I've replace the 2N3904 transistor on video board, without positive end. Do you know what is the UE8 equivalent on Classic II? I would try to reflux the solder point. Thanks.

Wow, great! it seems like my problem! I’ll try to replace this transistor as soon as possible. Thank you very much jimjimx!

Hi, the story of my Macintosh started some years ago...  In short: I've recapped A/B and Logic board, after many repair session where I've bad voltage at 5V rails, now, after last isopropyl alcohol cleaning of A/B, the voltage is stable, the Mac boot and "Boing" playing (eureka! It's never...

In my Mac Classic II I have similar problem. At the Pin 6 of the TDA I read 138V! (AC voltage) Is this possible? What can be the culprit?

I have the same problem with Classic II AB. What could it be? I'll try to replace DP4 and DP3 diodes