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Old 11th Jun 2019, 1:05 pm   #9
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 4,321
Default Re: Distorted image with Commodore 128

If it is a switched-mode type power supply then it would not be unusual for it to make a high-pitched whistle, but it could also mean that the power supply is working too hard due to failing capacitors, as Slothie suggested.

However: Please try an alternative video connection method - a video output lead made specifically for the C128 - before you go looking for hardware faults on the C128. I don't know if that machine has an RF-out connection intended to go into the antenna socket of a normal TV - if it does, try it like that and see if the machine seems to be working normally that way.
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