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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Sparky on September 01, 2007, 11:42:49 AM

Title: Bouncing screen problem
Post by: Sparky on September 01, 2007, 11:42:49 AM

Hi there,

I've an A600 and it has a problem where every time the floppy drive checks for a disk the screen does a little "bounce" (like if you turn on a strong magnetic field near to a an old TV)

Any ideas what might be wrong ?

(The floppy drive works fine)

Thanks

Mark

Title: Re: Bouncing screen problem
Post by: Sparky on September 01, 2007, 10:37:16 PM

Nope ... I was wrong .. changing the floppy didn't fix it, still got bouncy screen after I reassmbled the machine .... earthing problem ?!?

Title: Re: Bouncing screen problem
Post by: rkauer on September 01, 2007, 11:27:29 PM

 Bad electrolytic caps on the mobo AND on the PSU.

 Change all! It's inexpensive (a few caps can be buyed for no more than US$15.00, including those of the PSU).

 Check for oxidation ("rust") on the power conector, too.

Title: Re: Bouncing screen problem
Post by: Sparky on September 01, 2007, 11:47:47 PM

Ahh .. worth a go .. just going to have fun working out types I need though, any pointers ?

Thanks!

Mark

Title: Re: Bouncing screen problem
Post by: rkauer on September 02, 2007, 12:21:28 AM

Quote

Sparky wrote:
Ahh .. worth a go .. just going to have fun working out types I need though, any pointers ?

Thanks!

Mark

 Look for SMD ones, if you want to keep the machine as original as possible (on the mobo side).

 For the PSU ones, any piece is good enough, but look for 105 celsius grade for lastability/durability/realibility.

Title: Re: Bouncing screen problem
Post by: Zac67 on September 02, 2007, 10:10:24 AM

I'd go for 105°C types only - not much price difference and they'll last longer.

Title: Re: Bouncing screen problem
Post by: rkauer on September 03, 2007, 03:25:52 AM

 Please tell us what happened after the caps exchange.