Display problem on Macintosh Plus

[Wawavoun]

Hello there,

On a a recapped Mac Plus I got this display :

Macintosh Plus analog board repair

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There is also a strong corona discharge noise... I know probably I have to change this transformer.
Is there a possible repair (put epoxy resin inside and so on) ?

But is this moving display problem related also to this transformer ?

Thanks, regards.
Philippe

 

[cheesestraws]

Does it go away as it warms up? That looks like an issue I had, see here:

Fix report: WibblyPlus Wibbles No More

Following my normal habit of posting non-obvious fixes for other people to find: Symptom video: (thanks, @Paulie) Macintosh Plus. Definitely an analogue board problem; swapping AB made it go away. AB already recapped. Capacitors of decent quality and known to work in other ABs...

68kmla.org

 

[bibilit]

Bad solder joint or voltage too low.
using a multimeter at the floppy port is the way to go.
on the side of the Analog Board, a pot is provided for adjusting voltage.