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Re: Display issue

Posted: Tue Jul 04, 2017 5:25 pm
by mustangus
I get like scanlines and a faint bar scrolling down the screen on the monitor port and not the clear solid green and black text. The modulator output is worse than the monitor screen.

Re: Display issue

Posted: Tue Jul 04, 2017 7:58 pm
by sixxie
Tried reseating the PSU board connector (the chunky one that links it to the motherboard)? I find that sometimes helps with video issues. Think the pins oxidise and a bit of mechanical action helps scrub them.

Re: Display issue

Posted: Fri Jul 07, 2017 10:27 am
by tjewell
It's also worth noting that you have an earlyish D32 (the daughter board for the ram is a clue), so the quality of the video will never be that good, sadly. I have a D32 of that vintage and the quality is noticeably worse than my more recent D32, and my D64 is almost acceptable! So I wouldn't strive for perfection - but equally, that first picture of the RF signal is very poor, I'd expect it to look more like that picture of the monitor output. Good luck!

Tony

Re: Display issue

Posted: Fri Jul 07, 2017 10:32 am
by robcfg
That's right!

There were some models (16 x 16K MKII board, PC10087 Issue 6 P/N 48127 ) released with a P/N 48200 daughterboard to improve the signal quality.

It was later added to the Dragon 64 board.

Re: Display issue

Posted: Fri Jul 07, 2017 10:14 pm
by Alastair
munkeyboy wrote:RV1 the pot just behind the cassette and joystick ports looks very crusty, this could well be the culprit. It would be worth a gentle external clean and then note the position of the pot and give it a rotate back and forth to see if that will clean the contacts enough to improve the output.

Hope that helps, Gareth
MustAngus, even though it looks fine in the photo it may also be worth doing the above with RV2.

Another thing you may wish to do is remove both boards and check the underneaths for suspect solder joints or traces.

Re: Display issue

Posted: Sat Jul 08, 2017 8:41 am
by mustangus
I'll have a look underneath later. For the quality of the pic it was perfect before and on the same tv so i know something is queit right. Not sure whats going on with my other dragon 32, i have sound but no pic (i'll tackle that one much latewr thou.)