New and need help
Posted: Wed Jun 12, 2019 12:05 am
Hi all. Need a bit of help.
Week and a half ago I bought one owner 128 +2 Grey. Quite in nice condition.
Did lots of research on internet about differences, hardware, mods, connectivity, repairs, retro scene etc.
I am not an Electrical Engineer, but I recapped it, changed switching regulator, RGB to scart mod and removed audio from Composite Sync signal.
Connection to my monitor: rgb cable to GBS 8220. And from GBS to monitor VGA.
Now I have two problems:
1 )I am missing brighter shades of colors. If i do BREAK+Reset test -all I can see is only one type of the colors. No subcolors.
I thought maybe I damaged something when soldering, but someone said that GBS cannot reproduce Brightness signal. Is that true? I have seen some owner videos Spectrums running through GBS and no one mentioned missing colors.
I havent got Scart TV to try, but I have ordered cheap Scart to HDMI converter.
2) After about an hour running my +2 I get some kind of small vertical screen jitter. At first it's fine and later it starts to jitter more and more.
It's small amplitude, but it's unconfortable to look at the screen. It's constant and about 4-5 times per second. If I disconnect spectrum for half an hour - jitter dissapears, but than slowly appears again.
I think that's something to do with temperature - computer getting warmer, but I have no idea. Maybe ULA? Someone suggested to get ZX HD and said my problems will dissapear. But I would like to fix it if possible. I dont think its GBS upscaler problem.
So can anyone give me any pointers please.
Thanks, Paul
Week and a half ago I bought one owner 128 +2 Grey. Quite in nice condition.
Did lots of research on internet about differences, hardware, mods, connectivity, repairs, retro scene etc.
I am not an Electrical Engineer, but I recapped it, changed switching regulator, RGB to scart mod and removed audio from Composite Sync signal.
Connection to my monitor: rgb cable to GBS 8220. And from GBS to monitor VGA.
Now I have two problems:
1 )I am missing brighter shades of colors. If i do BREAK+Reset test -all I can see is only one type of the colors. No subcolors.
I thought maybe I damaged something when soldering, but someone said that GBS cannot reproduce Brightness signal. Is that true? I have seen some owner videos Spectrums running through GBS and no one mentioned missing colors.
I havent got Scart TV to try, but I have ordered cheap Scart to HDMI converter.
2) After about an hour running my +2 I get some kind of small vertical screen jitter. At first it's fine and later it starts to jitter more and more.
It's small amplitude, but it's unconfortable to look at the screen. It's constant and about 4-5 times per second. If I disconnect spectrum for half an hour - jitter dissapears, but than slowly appears again.
I think that's something to do with temperature - computer getting warmer, but I have no idea. Maybe ULA? Someone suggested to get ZX HD and said my problems will dissapear. But I would like to fix it if possible. I dont think its GBS upscaler problem.
So can anyone give me any pointers please.
Thanks, Paul