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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: AmmoJammo on August 22, 2014, 12:44:04 PM

Title: Amiga CD32 garbage video?
Post by: AmmoJammo on August 22, 2014, 12:44:04 PM: So, the video pretty much shows what its doing... there's also a clicking noise through the tv speakers, but I don't think its actually anything the CD32 is trying to play.

The colours almost look like the CD32 boot screen to me, but that could just me being optimistic :p

Any ideas?

Thanks!

(the CD32 was turned on and left on for this video)
http://youtu.be/dogBn9M3Y4o

Since making the video, I've pulled the kickstart chip, and no longer get any colours (just a black screen, or a black screen with grey shades of tearing), so it does appear that its trying to do something.
Title: Re: Amiga CD32 garbage video?
Post by: Rob on August 22, 2014, 06:32:46 PM: How is the CD32 connected to that monitor/TV? There a potentiometer on the TV modulator next to the RF out but adjusting it obviously won't make any difference if you're are not using RF.
Title: Re: Amiga CD32 garbage video?
Post by: Oldsmobile_Mike on August 22, 2014, 06:36:40 PM: If you put in a disc and power it up, does it spin the drive or act like it's trying to boot? Do you get "different garbage" on the screen?
Title: Re: Amiga CD32 garbage video?
Post by: carvedeye on August 22, 2014, 06:55:54 PM: If its attached to the TV with an RF cable it could be that it's not tuned into the TV correctly, if it is connected this way try doing a fine tune on the TV.
Title: Re: Amiga CD32 garbage video?
Post by: AmmoJammo on August 22, 2014, 10:34:51 PM: The CD32 was connected via composite, I've also tried it via S-Video.

Unfortunately, I don't have a cd drive for this CD32... all I have is the motherboard :p
Title: Re: Amiga CD32 garbage video?
Post by: AmmoJammo on August 23, 2014, 12:01:12 AM: does anyone know how much current the CD32 normally draws from the 5 and 12volt rails?

this motherboard is drawing about 1.1amps on the 5volt rail, which seems about right to me for not having a cd drive and not doing any processing? The 12volt rails its drawing only 80ma, which seems low, but may be perfectly normal?
Title: Re: Amiga CD32 garbage video?
Post by: AmmoJammo on October 27, 2014, 09:34:46 PM: I'm thinking this motherboard may have the same issue, but its worse on the one I have:
http://www.gumtree.com.au/s-ad/parkwood/consoles/amiga-cd32-motherboard-faulty-not-working-for-parts-only-/1059996828

"When you turn it on the boot up screen is all choppy and flickery and sometimes it loses the AV signal completely."
Title: Re: Amiga CD32 garbage video?
Post by: ElPolloDiabl on October 28, 2014, 05:22:06 AM: It sounds like something has failed. Check all the chips 1st. Next you will have to go through all the resistors and capacitors etc.
It may be a short circuit or open circuit if you are lucky.
Title: Re: Amiga CD32 garbage video?
Post by: F0LLETT on October 28, 2014, 02:23:27 PM: Sounds like cap leakage.
Damage to the Video DAC.