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#1 |
Registered User
Join Date: Apr 2016
Location: Perth, Australia
Posts: 433
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Did I just fry my A1200?
Hey
I was trying to install a CD ROM IDE drive connecting to my buffered IDE attachment on my A1200. I also used a 44 pin to 40 pin adapter. My A1200 was working for a couple of min but now it won't start up at all anymore. The power LED turns on, the RGB out has its usual dark grey video, but nothing else happens. Even if I remove the IDE devices entirely nothing starts up when I power on. The floppy drive doesn't click. No kickstart. I even removed the PiStorm accelerator, indecision MKIII and Gary mod to have bare bones machine but it still doesn't work. I even tried another power supply. Is my A1200 destroyed? T_T |
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#2 |
Registered User
Join Date: Jul 2019
Location: Poland
Posts: 34
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The only thing i can think is ROM chips failure. Try reinsert them. I doubt it will work, but it's probably the only thing that doesn't require more interference with the board. Rather you need professional help from someone who knows electronics and will look at the board.
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#3 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,918
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How long have you left it on for before concluding it's nonfunctional? Some versions will wait up to 30 seconds for a nonexistent HD to present itself before giving up and requesting a boot floppy.
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#4 |
Registered User
Join Date: Apr 2016
Location: Perth, Australia
Posts: 433
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I’ve left it on for a few min but I’ve also reconnected the CF card. The ROM chips can’t be the issue because the rom is loaded in via the pistorm and the icedrake and still neither of them work. even the floppy drive doesn’t check to see if there’s a disk inserted
I used the pistorm to change the boot rom to DiagROM and some of the tests freeze, namely the IRQ test. The audio test also I hear no audio. Not sure if this means faulty hardware or that DiagROM doesn’t work properly if booted from the pistorm mapped ROM |
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#5 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,918
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If you remove the PiStorm completely and just have a floppy only configurarion can you get to the floppy boot screen?
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#6 |
Registered User
Join Date: Apr 2016
Location: Perth, Australia
Posts: 433
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With no accelerator cards I just get a black screen and no disk (hard or floppy) accesses.
With the icedrake inserted I get the usual rainbow effect but then nothing. The only way I can get anything on my screen is by having the pistorm provide the DiagROM ROM. I’m not sure if my IDE CD-ROM attempts are to blame or if this is coincidence. I say that because this has actually happened before but it fixed itself after a while. |
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#7 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,918
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Possible damaged trace or cracked solder somewhere?
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#8 |
Registered User
Join Date: Jan 2015
Location: australia
Posts: 585
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It's sounding physical like that, like keyboard has smacked into something sometime, and cracked a joint/trace, and depending on temp, humidity, vibration and a whole lot more, it works or nor ~ things don't fix themselves, just as 'roos don't jump in front of cars.. =)
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#9 |
Registered User
Join Date: Apr 2016
Location: Perth, Australia
Posts: 433
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The fact I get no audio in the audio test, the IRQ and CIA and floppy disk read tests freeze in DiagROM makes me think I’ve murdered Paula
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#10 | |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,918
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Quote:
A dead CIA would generally trigger one of the early startup colour screens. When you say you get a "black" screen, is it really black or is it that dark grey colour? This matters because proper black without booting is a diagnostic for one of the CIAs. I think the other is a light grey. If Paula or one of the other custom chips is defective, you might get deadended on a blue screen. |
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#11 |
Registered User
Join Date: Feb 2017
Location: Ireland
Posts: 777
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It sounds like it could be Alice that's at fault, if Paula was removed from the board you would still get to the Kickstart boot screen I think.
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#12 |
Registered User
Join Date: Apr 2016
Location: Perth, Australia
Posts: 433
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It's that dark grey colour, so yeah it is outputting video correctly. And the display works fine with DiagROM booted up.
I've used 2 different power supplies too. |
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#13 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,918
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This suggests that all the normal POST stuff has checked out. So, if the last thing you were doing was messing around with the IDE port, perhaps some sense connection isn't working and it's thinking there's something it needs to wait for?
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#14 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 769
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What revision board do you have?
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#15 | |
Registered User
Join Date: Apr 2016
Location: Perth, Australia
Posts: 433
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Quote:
1D4 |
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#16 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 769
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Ah, I was wondering if maybe it was one of the earlier ones with a bodge wire that might have come loose.
Did your buffered IDE clip onto Gayle? what 44 pin to 40 pin adapter did you use? do you remember what you were doing the last time it went funny and then started working again? |
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#17 | |
old bearded fool
Join Date: Jan 2010
Location: Bangkok
Age: 57
Posts: 815
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Quote:
I had intermittent issues like this with bad caps, before replacing them. All it takes is for the caps to get a bit warmer when bad and suddenly it works, or not. Electrolytic capacitors usually turn into "resistors" when going bad. |
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#18 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,918
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Indeed. That's not as bad as failing tantalum caps though, th y can turn into a short circuit.
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#19 |
Registered User
Join Date: Apr 2016
Location: Perth, Australia
Posts: 433
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Not sure. I bought this A1200 second hand a few years ago. I assume it hasn't been
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#20 | |
old bearded fool
Join Date: Jan 2010
Location: Bangkok
Age: 57
Posts: 815
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Quote:
EDIT: If this is your problem I recommend replacing all of the electrolytic capacitors, not just the bad ones, or have someone do it for you, because the ones which are still good will probably start leaking soon as well. Last edited by modrobert; 07 August 2024 at 07:43. Reason: Added more stuff. |
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