Help for A2000 rev 6.4 board!

genny · 13 April 2011, 17:56

Hi, I have found this board in a friend's garage. It dont'have battery, so PCB is quite new. This board don't boot. It have a infinite loop: dark grey -> yellow -> dark grey -> yellow and so on. If I connect an accelerator board colours changed to: dark grey -> light grey -> yellow -> dark grey -> light grey -> yellow forever.....

I have changed CPU & ROM sockets. I have cleaned Agnus pins without fortune. Can someone help me?

Regards.

8bitbubsy · 13 April 2011, 23:12

You need to check other things too, like:
- Check the PSU - does it deliver a stable 5.00v (+/- 5%)?
- Capacitors. They might look OK but inside they might be dry as a cat! Especially check the big ones that are buffering the vcc rails, and the ones around the CPU.
- Look for fried resistors or burnt traces
- Look for bad contacts on the other custom chip sockets and the chips themselves
- Reseat the other custom chips
- Place your finger on each chip RAM and custom chips to see if any of them are getting suspiciously hot very fast (if some of them does, it might be a sign of it being fried)

genny · 16 April 2011, 04:06

I have solved: I have changed some caps and agnus socket, probably it have loosed tension.

8bitbubsy · 16 April 2011, 05:26

Great!

Did you take any pictures of the work? Nothing is like seing electronics repair pictures, it's almost an addiction for many of us in here!

13 April 2011, 17:56	#1
genny Registered User Join Date: Nov 2010 Location: Bari / Italy Age: 53 Posts: 13	Help for A2000 rev 6.4 board! Hi, I have found this board in a friend's garage. It dont'have battery, so PCB is quite new. This board don't boot. It have a infinite loop: dark grey -> yellow -> dark grey -> yellow and so on. If I connect an accelerator board colours changed to: dark grey -> light grey -> yellow -> dark grey -> light grey -> yellow forever..... I have changed CPU & ROM sockets. I have cleaned Agnus pins without fortune. Can someone help me? Regards.

13 April 2011, 23:12	#2
8bitbubsy Registered User Join Date: Sep 2009 Location: Norway Posts: 1,711	You need to check other things too, like: - Check the PSU - does it deliver a stable 5.00v (+/- 5%)? - Capacitors. They might look OK but inside they might be dry as a cat! Especially check the big ones that are buffering the vcc rails, and the ones around the CPU. - Look for fried resistors or burnt traces - Look for bad contacts on the other custom chip sockets and the chips themselves - Reseat the other custom chips - Place your finger on each chip RAM and custom chips to see if any of them are getting suspiciously hot very fast (if some of them does, it might be a sign of it being fried) Last edited by 8bitbubsy; 13 April 2011 at 23:17.

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16 April 2011, 04:06	#3
genny Registered User Join Date: Nov 2010 Location: Bari / Italy Age: 53 Posts: 13	I have solved: I have changed some caps and agnus socket, probably it have loosed tension.

16 April 2011, 05:26	#4
8bitbubsy Registered User Join Date: Sep 2009 Location: Norway Posts: 1,711	Great! Did you take any pictures of the work? Nothing is like seing electronics repair pictures, it's almost an addiction for many of us in here!

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