Amiga CD32 graphic problem

Assembler · 25 January 2015, 12:05

Hello, maybe someone can help me with this:

I have an AmigaCD32 (Rev 3 board) .
I got it cheap from "EB".

When I turn it on, i starts the game/music cd and after one minute, two minutes sometimes even after 30 seconds, the display goes completely crazy, don't know how to explain so see attached images.
The game or music cd however goes on because i can hear the sound effects or music, so It's just a graphic problem.

Just for info: I changed the laser unit into a compatible newer one
and I also changed the two "famus" capacitors, as they were very old and faulty.
But the problem still persists.

The rest of the mainboard doesn't show any signs of corrosion etc. all components are clean and all solder points are solid.

I tried with several different CD types (Sony, Verbatim, TDK, even cinese noname) , burned ones and original as with music cds.

Anyone has ever seen such a problem?

xArtx · 25 January 2015, 14:13

If it always comes on good and happens after a period,
I’d try keeping it very cold to rule out a bad joint, or even some fatigue inside a part.

This would be particularly suss if it goes for longer when booted from cold,
than if it’s been already used for a while.

mc6809e · 25 January 2015, 15:48

The problem could be a marginal IC or other component that fails as it heats up, often due to a high resistance internal short.

Carefully touch the top of each IC to see if its VERY hot. Don't burn yourself.

If you find one that seems quite hot, direct a stream of cool air from a can of compressed air at the component and see if things improve.

If there is some improvement, then you've found your bad component.

Assembler · 25 January 2015, 18:21

Thank you! Indeed when I boot it from cold it "lasts" longer!
I also thought about that it could be a heat problem. I'll try in the next days. Thank you "xArtx" and "mc6809e"

xArtx · 26 January 2015, 04:27

It’s not so much a heat problem, more that when the board reaches it’s operating temp,
the problem is exposed.
If you can run it by keeping it cool, it might work, but still only a bandaid solution.

Assembler · 26 January 2015, 13:07

Ah! Well if it's for that... I'm Italian! "Bandaid solutions" are our speciality! ;-)

Assembler · 03 February 2015, 18:42

Update info:

Tried everything, nothing changed. :-( Niente, nada, nichts, nothing ...
All the ICs and other components are cold as ice ... nothing gets hot.

I'm running out of ideas (..and patience...)

fxart · 03 February 2015, 18:53

I'am italian too!

Contct XAD/Nightfall (Trieste).
It's an hardware genious. This guys repair anything. See his blog.

http://www.nightfallcrew.com/?lang=it

He can solve anything. Believe me.

Assembler · 03 February 2015, 19:47

@fxart

thank you!! Great I'll give it a try.

Grazie caro!

voyager · 04 February 2015, 17:24

Buy a can of freeze spray and go around the board till you find the spot

jbenam · 05 February 2015, 11:01

Quote:

Originally Posted by Assembler

@fxart

thank you!! Great I'll give it a try.

Grazie caro!

Too bad I'm not in Italy anymore, otherwise I'd repair it for you for free

No profit should be done from an awesome hobby like the Amiga

Assembler · 25 February 2015, 06:36

Status update:

Problem solved! It was the "POWER SUPPLY" I replaced that and everything works fine! :-)

Thanks to everyone helping me with this.

25 January 2015, 12:05	#1
Assembler Registered User Join Date: Jan 2015 Location: Italy Posts: 13	Amiga CD32 graphic problem Hello, maybe someone can help me with this: I have an AmigaCD32 (Rev 3 board) . I got it cheap from "EB". When I turn it on, i starts the game/music cd and after one minute, two minutes sometimes even after 30 seconds, the display goes completely crazy, don't know how to explain so see attached images. The game or music cd however goes on because i can hear the sound effects or music, so It's just a graphic problem. Just for info: I changed the laser unit into a compatible newer one and I also changed the two "famus" capacitors, as they were very old and faulty. But the problem still persists. The rest of the mainboard doesn't show any signs of corrosion etc. all components are clean and all solder points are solid. I tried with several different CD types (Sony, Verbatim, TDK, even cinese noname) , burned ones and original as with music cds. Anyone has ever seen such a problem? Attached Thumbnails

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25 January 2015, 14:13	#2
xArtx Registered User Join Date: Jun 2013 Location: Australia Posts: 685	If it always comes on good and happens after a period, I’d try keeping it very cold to rule out a bad joint, or even some fatigue inside a part. This would be particularly suss if it goes for longer when booted from cold, than if it’s been already used for a while.

25 January 2015, 15:48	#3
mc6809e Registered User Join Date: Jan 2012 Location: USA Posts: 372	The problem could be a marginal IC or other component that fails as it heats up, often due to a high resistance internal short. Carefully touch the top of each IC to see if its VERY hot. Don't burn yourself. If you find one that seems quite hot, direct a stream of cool air from a can of compressed air at the component and see if things improve. If there is some improvement, then you've found your bad component.

25 January 2015, 18:21	#4
Assembler Registered User Join Date: Jan 2015 Location: Italy Posts: 13	Thank you! Indeed when I boot it from cold it "lasts" longer! I also thought about that it could be a heat problem. I'll try in the next days. Thank you "xArtx" and "mc6809e"

26 January 2015, 04:27	#5
xArtx Registered User Join Date: Jun 2013 Location: Australia Posts: 685	It’s not so much a heat problem, more that when the board reaches it’s operating temp, the problem is exposed. If you can run it by keeping it cool, it might work, but still only a bandaid solution.

26 January 2015, 13:07	#6
Assembler Registered User Join Date: Jan 2015 Location: Italy Posts: 13	Ah! Well if it's for that... I'm Italian! "Bandaid solutions" are our speciality! ;-)

03 February 2015, 18:42	#7
Assembler Registered User Join Date: Jan 2015 Location: Italy Posts: 13	Update info: Tried everything, nothing changed. :-( Niente, nada, nichts, nothing ... All the ICs and other components are cold as ice ... nothing gets hot. I'm running out of ideas (..and patience...)

03 February 2015, 18:53	#8
fxart FxART Join Date: Jan 2012 Location: Italy Posts: 12	I'am italian too! Contct XAD/Nightfall (Trieste). It's an hardware genious. This guys repair anything. See his blog. http://www.nightfallcrew.com/?lang=it He can solve anything. Believe me.

03 February 2015, 19:47	#9
Assembler Registered User Join Date: Jan 2015 Location: Italy Posts: 13	@fxart thank you!! Great I'll give it a try. Grazie caro!

04 February 2015, 17:24	#10
voyager The show must go on. Join Date: Dec 2010 Location: Alkmaar Nederland Posts: 269	Buy a can of freeze spray and go around the board till you find the spot

25 February 2015, 06:36	#12
Assembler Registered User Join Date: Jan 2015 Location: Italy Posts: 13	Status update: Problem solved! It was the "POWER SUPPLY" I replaced that and everything works fine! :-) Thanks to everyone helping me with this.

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