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520ST With Bad "Jailbars" On Video Output

Problems with your machine in general.
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exxos
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Re: 520ST With Bad "Jailbars" On Video Output

Post by exxos »

The video DAC is as good as things can be. If you want a better solution, you would be better getting a STFM.
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Re: 520ST With Bad "Jailbars" On Video Output

Post by HCRX27 »

Well, at the moment I'd rather need an information what to expect from transistors replacement as you mentioned in your article with certain improvement, not considering DAC VIDEO mode (maybe just not yet) ;)
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Re: 520ST With Bad "Jailbars" On Video Output

Post by rubber_jonnie »

Nice to see you here @ctrl.alt.rees, I'm a frequent viewer of your channel :)

FYI I can honestly say my STM has terrible jailbars on Low/Med res, and I have a modern PSU and the original RAM was replaced with a 4MB upgrade from @exxos, so fairly sure they aren't the culprits.

Interestingly, Hi res is just fine. This is testing via a VGA adapter BTW.

It does seem to be a fairly regular issue though, you're not alone.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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Re: 520ST With Bad "Jailbars" On Video Output

Post by Steve »

FYI @rubber_jonnie I doubt Rees is watching this thread since he opened it five years ago and hasn't been active since. @HCRX27 necroed the thread back to life :)
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Re: 520ST With Bad "Jailbars" On Video Output

Post by rubber_jonnie »

Steve wrote: Tue Sep 16, 2025 12:58 pm FYI @rubber_jonnie I doubt Rees is watching this thread since he opened it five years ago and hasn't been active since. @HCRX27 necroed the thread back to life :)
Haha, show how much I'm paying attention...
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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Re: 520ST With Bad "Jailbars" On Video Output

Post by exxos »

rubber_jonnie wrote: Tue Sep 16, 2025 1:15 pm
Steve wrote: Tue Sep 16, 2025 12:58 pm FYI @rubber_jonnie I doubt Rees is watching this thread since he opened it five years ago and hasn't been active since. @HCRX27 necroed the thread back to life :)
Haha, show how much I'm paying attention...
Its also why I mentioned a while back that maybe we should install the extension to automatically lock threads after a year of inactivity to stop this sort of thing from happening..
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Re: 520ST With Bad "Jailbars" On Video Output

Post by rubber_jonnie »

exxos wrote: Tue Sep 16, 2025 1:17 pm
rubber_jonnie wrote: Tue Sep 16, 2025 1:15 pm

Haha, show how much I'm paying attention...
Its also why I mentioned a while back that maybe we should install the extension to automatically lock threads after a year of inactivity to stop this sort of thing from happening..
Sounds sensible to me.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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Location: Poland

Re: 520ST With Bad "Jailbars" On Video Output

Post by HCRX27 »

What's wrong though with the thread, if this or similiar issue is a typical situation across different motherboards, yet there can be some differences? Is there a quota on the server? ;-)
Anyway, that's how it looks on my machine.

I'll compare it after transistor replacement is done and share the result, so at least there will be more documented knowledge into it :-)
Attachments
20250907_185630.jpg
20250907_185630.jpg (149.49 KiB) Viewed 194 times
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Re: 520ST With Bad "Jailbars" On Video Output

Post by rubber_jonnie »

HCRX27 wrote: Tue Sep 16, 2025 1:25 pm What's wrong though with the thread, if this or similiar issue is a typical situation across different motherboards, yet there can be some differences? Is there a quota on the server? ;-)
Anyway, that's how it looks on my machine:
Image
I'll compare it after transistor replacement is done and share the result, so at least there will be more documented knowledge into it :-)
You can't use external images I'm afraid, it's not permitted on the forum, you'll need to upload them and place inline in your post.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
HCRX27
Posts: 13
Joined: Wed Aug 09, 2023 8:53 am
Location: Poland

Re: 520ST With Bad "Jailbars" On Video Output

Post by HCRX27 »

@rubber_jonnie
Indeed, thank you. I was looking for, but somehow missed attachment option earlier on. Edited :)
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