On Aug 26, 6:13 pm, Dan Stephen wrote:
I have a Hung Chan 6502 20MHz cro that is proving rather difficult to
repair. Apparently it is also known as a Protek 6502.

The fault is that the trace is only just visible with the brightness on
full. This one has me baffled.

Any advice would be greatly appreciated.

Cheers,

Dan

Do you have a schematic? Check the various voltages on the CRT. If
you have a high-voltage probe, measure the accelerator voltage -
carefully!

H. R.(Bob) Hofmann