MegaSTE Repair Continued - Video Noise
Re: MegaSTE Repair Continued - Video Noise
Moving around the 32MHz wire as far away as possible of the video signal did nothing.
Proud owner of:
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
Re: MegaSTE Repair Continued - Video Noise
So just to wrap up from my side:
Have swapped back to the old PSU and the noise has immediately returned. Have ordered exxos’s recap kit for my model PSU, and I’ll keep the Meanwell as a nice multi-volt test supply. I’ve got a bare STE board I can use it on for tinkering.
Thanks all for your help - I should’ve just recapped the damn thing straight away, but I got swayed by its apparently decent output and the good rep that the MSTE’s PSU has!
Have swapped back to the old PSU and the noise has immediately returned. Have ordered exxos’s recap kit for my model PSU, and I’ll keep the Meanwell as a nice multi-volt test supply. I’ve got a bare STE board I can use it on for tinkering.
Thanks all for your help - I should’ve just recapped the damn thing straight away, but I got swayed by its apparently decent output and the good rep that the MSTE’s PSU has!
A bunch of Ataris and others:
Atari XEGS with RGB mod - STFM - Portfolio - Lynx Mk1 with McWill display - Mega STE - Falcon030 - Jaguar
Commodore VIC-20 CR with ClearVideo - CDTV (Wicher 8MB+IDE)
Acorn Electron - Archimedes A3020
Atari XEGS with RGB mod - STFM - Portfolio - Lynx Mk1 with McWill display - Mega STE - Falcon030 - Jaguar
Commodore VIC-20 CR with ClearVideo - CDTV (Wicher 8MB+IDE)
Acorn Electron - Archimedes A3020
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Re: MegaSTE Repair Continued - Video Noise
PSUs are usually worth recapping from the off, though the rest is normally OK.displaced wrote: ↑Thu Jan 07, 2021 3:18 pm So just to wrap up from my side:
Have swapped back to the old PSU and the noise has immediately returned. Have ordered exxos’s recap kit for my model PSU, and I’ll keep the Meanwell as a nice multi-volt test supply. I’ve got a bare STE board I can use it on for tinkering.
Thanks all for your help - I should’ve just recapped the damn thing straight away, but I got swayed by its apparently decent output and the good rep that the MSTE’s PSU has!
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...
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...
Re: MegaSTE Repair Continued - Video Noise
Yeah - don’t know why I didn’t just go for it. Always seems like a big job for amateurs like me. But I’ve done it once before on an Archimedes, and have replaced caps elsewhere with success. And PSU caps are usually nice and chunky on not especially dense PCBs - so not technically difficult, just needs a good amount of care!
A bunch of Ataris and others:
Atari XEGS with RGB mod - STFM - Portfolio - Lynx Mk1 with McWill display - Mega STE - Falcon030 - Jaguar
Commodore VIC-20 CR with ClearVideo - CDTV (Wicher 8MB+IDE)
Acorn Electron - Archimedes A3020
Atari XEGS with RGB mod - STFM - Portfolio - Lynx Mk1 with McWill display - Mega STE - Falcon030 - Jaguar
Commodore VIC-20 CR with ClearVideo - CDTV (Wicher 8MB+IDE)
Acorn Electron - Archimedes A3020
Re: MegaSTE Repair Continued - Video Noise
I guess I will try an other PSU and see if this has an impact on the noise.
Proud owner of:
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
Re: MegaSTE Repair Continued - Video Noise
If your using my PSU then it has like x10 less noise than original ones, so it wouldn't make any sense if a different PSU solved the problem.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: MegaSTE Repair Continued - Video Noise
As expected, switching to the original PSU did literally nothing.
I guess I have to take a closer look to the video circuit. :/
I guess I have to take a closer look to the video circuit. :/
Proud owner of:
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
Re: MegaSTE Repair Continued - Video Noise
I don't remember if you have done this fix.. it may help on a STE anyway with your issue..
https://www.exxosforum.co.uk/atari/last/ ... /index.htm
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: MegaSTE Repair Continued - Video Noise
Yup I did this fix. It removes the ghosting but not the noisy vertical lines.
Proud owner of:
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
Re: MegaSTE Repair Continued - Video Noise
Looking more into this issue. The white lines now starts to be visible at NTSC 60 Hz.
I suspect U401 C301712-001 is failing.
Unfortunately, I don't have a spare part to verify this hyptohesis quickly. :/
I suspect U401 C301712-001 is failing.
Unfortunately, I don't have a spare part to verify this hyptohesis quickly. :/
Proud owner of:
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).
- Atari STF (US).
- Atari STE (UK).
- Atari Falcon030 (US).
- Amiga 1200 (UK).