screen flickers when floppy is active

dalton · 26 December 2010, 12:03

Hi!

When the floppy drive of my A1200 is active, the screen flickers on my CBM 1084 monitor (connected with RGB-cable). Is anybody familiar with that problem? How can it be aided?

Regards
Dalton/Tulou

orange · 26 December 2010, 12:35

I'd check the PSU, it might be too weak.

pandy71 · 26 December 2010, 12:35

caps need to be replaced?

Dagger · 26 December 2010, 12:36

Do you have a pcmcia ram card fitted? Only ask as I had a 600 that used to flicker when the drives were accessed with a pcmcia card fitted and I was told that was down to dodgy caps.

dalton · 26 December 2010, 18:56

I'm using a 4.5A (A500) PSU so that shouldn't be the problem. No pcmcia card fitted. Perhaps the caps then... Is it common that they loose their capacitance as they get old?

rkauer · 26 December 2010, 20:12

Known & old problem. Your A1200 mobo revision is 1D4, right?

http://aminet.net/package/docs/hard/flickfix

Alternatively, look at http://aminet.net/package/docs/hard/15khzhackext

Amiga1992 · 27 December 2010, 19:26

I'd say it could be a cap problem, I had this happening on my A600 too.

dalton · 28 December 2010, 07:32

It's a 1D4 board alright. Can't believe I never heard of such a problem before. I'll look into the fixes and write here again when it works (or doesn't). Thanks!

_psy · 28 December 2010, 21:14

the readme in http://aminet.net/package/docs/hard/flickfix says

"The first A1200 released by Commodore Amiga had a screen flicker
bug, when the CPU loaded the screen started flicking, this fix
will remove the bug. "

The 1D4 board isn't the first released amiga 1200 and mine don't have this problem anyway look all the info you can get

alexh · 28 December 2010, 22:48

Some A600 motherboards have a fault where the screen flickers (actually the colour flickers) on the composite video output when using the floppy drive. Using an RGB cable fixes the problem.

Dunno if A1200's also suffered from it?

26 December 2010, 12:03	#1
dalton tulou Join Date: Jun 2006 Location: Gothenburg / Sweden Posts: 88	screen flickers when floppy is active Hi! When the floppy drive of my A1200 is active, the screen flickers on my CBM 1084 monitor (connected with RGB-cable). Is anybody familiar with that problem? How can it be aided? Regards Dalton/Tulou

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26 December 2010, 12:35	#2
orange Registered User Join Date: Apr 2007 Location: Belgrade Posts: 567	I'd check the PSU, it might be too weak.

26 December 2010, 12:35	#3
pandy71 Registered User Join Date: Jun 2010 Location: PL? Posts: 2,748	caps need to be replaced?

26 December 2010, 12:36	#4
Dagger Registered User Join Date: Aug 2009 Location: Dagenham / England Posts: 182	Do you have a pcmcia ram card fitted? Only ask as I had a 600 that used to flicker when the drives were accessed with a pcmcia card fitted and I was told that was down to dodgy caps.

26 December 2010, 18:56	#5
dalton tulou Join Date: Jun 2006 Location: Gothenburg / Sweden Posts: 88	I'm using a 4.5A (A500) PSU so that shouldn't be the problem. No pcmcia card fitted. Perhaps the caps then... Is it common that they loose their capacitance as they get old?

26 December 2010, 20:12	#6
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Known & old problem. Your A1200 mobo revision is 1D4, right? http://aminet.net/package/docs/hard/flickfix Alternatively, look at http://aminet.net/package/docs/hard/15khzhackext

27 December 2010, 19:26	#7
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	I'd say it could be a cap problem, I had this happening on my A600 too.

28 December 2010, 07:32	#8
dalton tulou Join Date: Jun 2006 Location: Gothenburg / Sweden Posts: 88	It's a 1D4 board alright. Can't believe I never heard of such a problem before. I'll look into the fixes and write here again when it works (or doesn't). Thanks!

28 December 2010, 21:14	#9
_psy Registered User Join Date: Oct 2010 Location: Thessaloniki/Greece Age: 44 Posts: 117	the readme in http://aminet.net/package/docs/hard/flickfix says "The first A1200 released by Commodore Amiga had a screen flicker bug, when the CPU loaded the screen started flicking, this fix will remove the bug. " The 1D4 board isn't the first released amiga 1200 and mine don't have this problem anyway look all the info you can get

28 December 2010, 22:48	#10
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,342	Some A600 motherboards have a fault where the screen flickers (actually the colour flickers) on the composite video output when using the floppy drive. Using an RGB cable fixes the problem. Dunno if A1200's also suffered from it?

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