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The OP1 (TDA4605) ? Yea I am still waiting on the delivery of it so I can replace that too.

Experimented with freeze spray to try to find the fault cause of cold start with low voltage.... After freezing all the areas of the analog board while having the mac running found that freezing this area resulted in an instant voltage drop down to 4.6-4.7v and the mac going back to how it...

When using a hairdrier on the analog board, I can instantly bring the voltage to 5.1v and the mac boots well and no wobble. I did see a similar post here. Currently looking into why it could be. The colder the weather is the lower the initial voltage is. I tested it today by leaving my Classic...

How is your Classic now? I am in the exactly the same situation as you: fully recapped analog board together with all the other components your replaced (except PP1) and getting a 4.7v checked board with wobbly screen. Voltage slowly rises and after about 10-15 mins when it reaches about 5.05v...

Oh bummer, sad to hear. Sometimes we just have to give up - I am sure you still had a few handy learnings out of this case.

How did you go? Did you manage to fix the issue