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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: tokyoracer on December 10, 2007, 12:18:28 AM

Title: A600 - Purple Screen of Death!?
Post by: tokyoracer on December 10, 2007, 12:18:28 AM

I just noticed the A600 I was using turned purple and have no idea why, TV is fine and the machine seems to function ok. Would anyone know anything about this or have experienced the same problems? :-?

Title: Re: A600 - Purple Screen of Death!?
Post by: Virge on December 10, 2007, 12:29:23 AM

Hi. Seems to be the rom ... is the rom 2.04 / 2.05 ?

Best Regards

Pedro Henriques

Title: Re: A600 - Purple Screen of Death!?
Post by: tokyoracer on December 10, 2007, 09:56:46 AM

No, it's 3.1 .

Title: Re: A600 - Purple Screen of Death!?
Post by: rkauer on December 10, 2007, 04:14:59 PM

 Do you use an original ROM or a writed EPROM?

Title: Re: A600 - Purple Screen of Death!?
Post by: Piru on December 10, 2007, 04:28:29 PM

Green component missing from the RGB signal perhaps? Check the cable and connectors.

Title: Re: A600 - Purple Screen of Death!?
Post by: tokyoracer on December 10, 2007, 05:03:32 PM

Cables all seem fine, I't isn't an official MX ROM chip (has paper label) so I presume it is written on.

Title: Re: A600 - Purple Screen of Death!?
Post by: DrDekker on December 11, 2007, 04:35:27 PM

As Piru has suggested - it'll be the green component that's gone west.  Same thing has happened with one of my A600's.

Whether it's Denise or the hybrid U37(?) that's at fault - I don't know, but it's definitely not the cabling as all outputs (scart, VGA and composite) are affected.

Title: Re: A600 - Purple Screen of Death!?
Post by: kolla on December 11, 2007, 05:58:40 PM

I have an A1200 that also suffers from purple taint :-)

Title: Re: A600 - Purple Screen of Death!?
Post by: tokyoracer on December 12, 2007, 02:42:50 AM

Are you sure it's the ROM? I don't fancy forking out £15 or so just for a chip if it is working fine. :-?

Title: Re: A600 - Purple Screen of Death!?
Post by: rkauer on December 12, 2007, 03:16:13 AM

 No, it's not the ROM, you have a busted ECS Denise, or the related color chip is the problem (or even a faulty SMD resistor).

 If you have the schematics (and the skills), trace the green signal along the way from Denise to the CXA1145 (video encoder), U31 (74HCT244), Q212 (green transistor)+ associated resistors, and other areas involved.

Title: Re: A600 - Purple Screen of Death!?
Post by: tokyoracer on December 12, 2007, 11:55:43 PM

I think "bugger" springs to mind. :lol:

New motherboard it is then... :roll:

Title: Re: A600 - Purple Screen of Death!?
Post by: rkauer on December 13, 2007, 01:01:48 AM

 I, personally, never will get up to simple problem like that!

Title: Re: A600 - Purple Screen of Death!?
Post by: tokyoracer on December 13, 2007, 11:26:39 AM

@ rkauer: I don't get you. :-?