Mega STE, explosive boot

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fenarinarsa
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Joined: Mon Dec 18, 2017 4:03 pm

Mega STE, explosive boot

Post by fenarinarsa » Wed Feb 14, 2018 1:55 am

I had a bad surprise when I booted up my Mega STE this evening...

IMG_0966_small.jpg
IMG_0966_small.jpg (109.65 KiB) Viewed 748 times

I tried to remove and replace the SIMMs and it booted, but an hour later it started to crash again.

In addition a few weeks ago I plugged it on a broadcast-grade HD CRT monitor and noticed that the video signal was not stable - it was perfect on my other regular STE. It was kind of "weavy" horizontally.

My guess is I need at least to do a full PSU recap but my experience in soldering counts in only a few hours. Any suggestions? I'm not really sure I can do a correct job even if the guide looks to be really well done.

That and I hope it's not something worse.

Any advice is welcome :)

Petari
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Re: Mega STE, explosive boot

Post by Petari » Wed Feb 14, 2018 8:26 am

Recap of PSU is good thing, but it seems rather that you have some bad contacts. So, should do usual PLCC chip removing and cleaning contacts, checking connectors.
There is 2 kind of people: one thinking about moving to Mars after here becomes too bad, the others thinking about how to keep this planet habitable.

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rubber_jonnie
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Re: Mega STE, explosive boot

Post by rubber_jonnie » Wed Feb 14, 2018 2:13 pm

If you can get some Isopropyl Alcohol wipes, or just the fluid, then that will help clean any contacts up, but a re-cap may be something you should consider anyway.

If it's taking an hour to crash, it may be heat related. Not sure what fans the MSTEs have, worth checking they're running ok if it has them.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

stephen_usher
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Re: Mega STE, explosive boot

Post by stephen_usher » Wed Feb 14, 2018 7:09 pm

rubber_jonnie wrote:
Wed Feb 14, 2018 2:13 pm
If it's taking an hour to crash, it may be heat related. Not sure what fans the MSTEs have, worth checking they're running ok if it has them.
Just like all but the very earliest TTs, they have just the PSU fan.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

fenarinarsa
Posts: 9
Joined: Mon Dec 18, 2017 4:03 pm

Re: Mega STE, explosive boot

Post by fenarinarsa » Thu Feb 15, 2018 1:08 am

It's not heat-related, I just tried to power it on again after one full day of no use and it crashed on boot.

I will start by cleaning contacts as Petari said, actually someone else gave me the exact same advice today.

Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Mega STE, explosive boot

Post by Steve » Thu Feb 15, 2018 3:07 am

stephen_usher wrote:
Wed Feb 14, 2018 7:09 pm
rubber_jonnie wrote:
Wed Feb 14, 2018 2:13 pm
If it's taking an hour to crash, it may be heat related. Not sure what fans the MSTEs have, worth checking they're running ok if it has them.
Just like all but the very earliest TTs, they have just the PSU fan.
Actually I think the earliest TTs had two fans, the later models only had the PSU fan.

stephen_usher
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Re: Mega STE, explosive boot

Post by stephen_usher » Thu Feb 15, 2018 6:45 pm

Steve wrote:
Thu Feb 15, 2018 3:07 am
stephen_usher wrote:
Wed Feb 14, 2018 7:09 pm


Just like all but the very earliest TTs, they have just the PSU fan.
Actually I think the earliest TTs had two fans, the later models only had the PSU fan.
Indeed, that's what I said. :-)
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

Steve
Posts: 151
Joined: Fri Sep 15, 2017 11:49 am

Re: Mega STE, explosive boot

Post by Steve » Fri Feb 16, 2018 3:13 am

Haha I missed the `but` :)

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rubber_jonnie
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Re: Mega STE, explosive boot

Post by rubber_jonnie » Fri Feb 16, 2018 8:31 am

fenarinarsa wrote:
Thu Feb 15, 2018 1:08 am
It's not heat-related, I just tried to power it on again after one full day of no use and it crashed on boot.

I will start by cleaning contacts as Petari said, actually someone else gave me the exact same advice today.
Yep, definitely not a heat problem then. Contacts is a good place to start, may be worth getting a magnifying glass out and having a close look at caps, just in case.

If cleaning the contacts, have you considered a SIMM swap to see if that makes a difference?
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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