CIA Timing too slow and freezing

avinitlarge · 23 September 2021, 21:44

I’ve got a 1.5 A600 that won’t boot. It boots diagrom but failing the CIA test, it also freezes every so often when running the CIA tests. It’s been recapped, new caps and resistors around the CIA chips, I’ve spent hours tracing the lines from the CIA chips, I’ve removed and refitted the CIA’s, CPU, Gayle, Agnus, Paula.
Ive managed to get it to boot the original Rom twice but it was short lived.
Could a faulty CPU be the cause?

Galahad/FLT · 23 September 2021, 23:54

Of cias are not surface mounted have you tried swapping them?

avinitlarge · 23 September 2021, 23:56

Quote:

Originally Posted by Galahad/FLT

Of cias are not surface mounted have you tried swapping them?

They both throw up the same issue so swapping them won’t help.

Galahad/FLT · 24 September 2021, 00:53

Quote:

Originally Posted by avinitlarge

They both throw up the same issue so swapping them won’t help.

Then its unlikely to be both cias at fault

avinitlarge · 24 September 2021, 00:56

Quote:

Originally Posted by Galahad/FLT

Then its unlikely to be both cias at fault

I agree, I think it’s around the cpu/Gayle area. Someone suggested that it could Possibly be the Eclock from the Gayle. I’m going to do more test tomorrow.

nikosidis · 24 September 2021, 08:12

The CIA chips are very fragile. They often fail on A500.
Sad they are not on socket on A600

Jope · 24 September 2021, 09:56

I've had an a1200 with both CIAs failing their timers. I couldn't believe it, but first I replaced the first one with known good, saw it made a difference, then replaced the second one and had a fully fixed amiga.

Such is life. No idea why the timers died on both.

23 September 2021, 21:44	#1
avinitlarge Registered User Join Date: May 2016 Location: Rotherham Posts: 65	CIA Timing too slow and freezing I’ve got a 1.5 A600 that won’t boot. It boots diagrom but failing the CIA test, it also freezes every so often when running the CIA tests. It’s been recapped, new caps and resistors around the CIA chips, I’ve spent hours tracing the lines from the CIA chips, I’ve removed and refitted the CIA’s, CPU, Gayle, Agnus, Paula. Ive managed to get it to boot the original Rom twice but it was short lived. Could a faulty CPU be the cause? Attached Thumbnails

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23 September 2021, 23:54	#2
Galahad/FLT Going nowhere Join Date: Oct 2001 Location: United Kingdom Age: 50 Posts: 8,986	Of cias are not surface mounted have you tried swapping them?

24 September 2021, 08:12	#6
nikosidis Registered User Join Date: Jan 2020 Location: oslo/norway Posts: 1,607	The CIA chips are very fragile. They often fail on A500. Sad they are not on socket on A600

24 September 2021, 09:56	#7
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	I've had an a1200 with both CIAs failing their timers. I couldn't believe it, but first I replaced the first one with known good, saw it made a difference, then replaced the second one and had a fully fixed amiga. Such is life. No idea why the timers died on both.

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