A4000 permanent green screen

Computolio · 27 August 2007, 01:03

I have here an Amiga 4000 that is pretty much dead. I get a green screen no matter what. I have tried:

* Replacing the CHIP RAM SIMM with a known-good unit
* Replacing the CHIP RAM SIMM socket
* Replacing the CPU board with a known-good unit
* Replacing the power supply with a known-good unit
* Replacing all oscillators with known-good parts
* Replacing the ROMs with known-good parts

I'm beginning to think that perhaps the Alice chip is fried. This is a big-ass surface-mount chip and I have neither a spare chip nor the specialized equipment to install it. Plus it could probably be something else.

So which is going to be the least expensive - somehow finding a new motherboard or sending this one off to AmigaCenter to get fixed? What are AmigaCenter's prices like and will they let you send just a motherboard? Seeing as how I'm in the US and they're in France, how bad would the shipping costs be?

thomas · 27 August 2007, 09:28

Check the clock battery. A leaking battery might have destroyed the connections between RAM and CPU.

Computolio · 28 August 2007, 03:09

I forgot to mention: there is virtually zero battery damage on this board. That is an idea though - does anyone have the pinout for the "Alice" chip? I could try to trace out the RAM connections.

27 August 2007, 01:03	#1
Computolio Registered User Join Date: Apr 2004 Location: California Posts: 174	A4000 permanent green screen I have here an Amiga 4000 that is pretty much dead. I get a green screen no matter what. I have tried: * Replacing the CHIP RAM SIMM with a known-good unit * Replacing the CHIP RAM SIMM socket * Replacing the CPU board with a known-good unit * Replacing the power supply with a known-good unit * Replacing all oscillators with known-good parts * Replacing the ROMs with known-good parts I'm beginning to think that perhaps the Alice chip is fried. This is a big-ass surface-mount chip and I have neither a spare chip nor the specialized equipment to install it. Plus it could probably be something else. So which is going to be the least expensive - somehow finding a new motherboard or sending this one off to AmigaCenter to get fixed? What are AmigaCenter's prices like and will they let you send just a motherboard? Seeing as how I'm in the US and they're in France, how bad would the shipping costs be?

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27 August 2007, 09:28	#2
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 7,026	Check the clock battery. A leaking battery might have destroyed the connections between RAM and CPU.

28 August 2007, 03:09	#3
Computolio Registered User Join Date: Apr 2004 Location: California Posts: 174	I forgot to mention: there is virtually zero battery damage on this board. That is an idea though - does anyone have the pinout for the "Alice" chip? I could try to trace out the RAM connections.

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