A4000 doesn't recognize AGA properly!

[Robert1234]

Hi, I've got a problem with bought A4000 desktop and I expect to find someone competent here which would help me to fix it.

OK, so the problem is that system doesn't recognize AGA chipset. Here are some facts:
1. In Early Startup Control there is no option called "Best Available". Only "Original" and "Enhanced".
2. When the system boots I can only choose OCS modes e.g. Lores 32 colors and Hires 16 colors.
3. Interesting fact: when the system boots with "Cache Disabled" in Boot Menu the computer starts with distorted graphics but the ECS modes are available now.
4. Replacing ROMs didn't solve the problem.

Is there someone which can guess what's faulty in this A4000? Is it possible that it's something with processor board?

[Robert1234]

Maybe a defective or incorrect kickstart chip. What are the revision numbers?

As I mentioned I replaced kickstarts (ROMs) and the problem didn't solve. I tested with 3.1 and 3.0 kickstarts (proper A4000 kickstarts). Is it possible that:

- something is wrong with motherboard,
- something is wrong with processor board? (my guess)

I must mention that SetPatch prints "Advanced Graphics Modes Available", but actually there are no such modes in ScreenMode preferences program.

Thank you for any help!

[Robert1234]

Do AGA games work?

Yes, they do. The problem is with the system screen modes.

[Robert1234]

It's possible that you have a hardware problem. My A4000 doesn't allow me to select AGA screen modes in workbench. The reason is the battery has leaked and damaged the motherboard. Have you checked for leaking battery/caps damage?

Weed

I'm not too experienced in A4000, but on the right side of the motherboard is a battery, and there is a kind of white semi-translucent liquid. So it's the battery leak, right?

[Robert1234]

Will make photo in a couple of days (probably tomorrow). If this is a battery leak is there a way to fix it? What if the motherboard was corroded, is there a chance to bring it to full working condition with the AGA modes available?

[Robert1234]

I attach the photos of the battery (leak).

[Robert1234]

That's a coin battery, they ususaly don't leak. Is your motherboard a 4000CR version? Or did someone replace the leaky type with this?

As previous owner of this Amiga told me this is a replacement battery of the old one. Do you see a leak on the photo? Because it seems that it's present.