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fading characters

Posted: Sun Jan 13, 2019 8:36 pm
by eXne
Folks,recently I purchased a BBC from the UK and started the normal process by first checking the PSU caps which needed to be replaced.
When I turned the Beeb on I was puzzled as I saw fading characters.
Pic-20190113-001.jpg
fading characters
After browsing the forum and google I found nothing similar, or I entered the wrong keywords :wink:
Memory seems to be ok, video ULA seems to be fine as well,
The 'puzzling graphics glitch on my Beeb' here was the base for the soluction.. and yes after some thinking: has this maybe something to do with the PSU not being earthed? As this is a UK machine I used an adapter with no earthing...
Installed an Earth connection and voila..
Pic-20190113-002.jpg
normal characters
Normally everybody starts with questions, this time I wanted to share


Etienne

Re: fading characters

Posted: Sun Jan 13, 2019 11:47 pm
by tricky
Does that mean that your video connection is missing a GND?

Re: fading characters

Posted: Mon Jan 14, 2019 7:37 pm
by eXne
I need to dig into that part.
I have my beeb hooked through the RGB port to a TV Scart input.