Quote:
Originally Posted by TUD1
Well I found the focus adjustment, put the cover back on, and it wasn't 5 seconds before the brightness went out the window. I did not adjust a single thing while the back was off the TV. Brightness and contrast have no effect.
No HV probe here.
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^Text book failure of the monochrome video chain. Somewhere between the place chroma splits from the monochrome in the signal chain and the element of the CRT driven by the monochrome signal you are intermittently loosing the video signal.
You need a schematic, and either an oscilloscope, or a purpose made TV test pattern generator with a variable level video output to trouble shoot that.