Amiga 1200 flashing lights

[sturulez]

Okay I've replaced the power supply. Has made no difference. Though I'd connect the Floppy disk drive, but I get no ticking noise when I turn the machine back on. If it is the capacitors which ones do I need to check?

Thanks

[Oldsmobile_Mike]

I'd just start with a visual inspection - are any of them bulging, leaking, etc.?  Feel free to post photos if you have any questions.  I tried googling to come up with a list, but was directed to a dead link.  Perhaps you'll have more luck or time to research - but it shouldn't take long for a visual inspection.  Good luck!  

[sturulez]

Okay, I've removed the heat shield. Visually inspected the circuit board, can't find anything unusual as described in the post above

So the next step I take it would be to check the voltages? If so could someone tell me where I would start.

Many thanks

[sturulez]

Or could the motherboard be completely fried?

[paul1981]

Or could the motherboard be completely fried?

Check for dull solder joints on all SMD caps (they're in little silver cans with black paint on one side to denote polarity). Dull joints would be a sign of leakage.
It's possible the board needs a re-cap anyway even if it looks okay visually, but I'm sure that installing the roms incorrectly wouldn't have done the roms or your motherboard any good at all.
As for the voltages, well you've tried a different PSU and they're both giving you the same result so I wouldn't worry about the PSU/voltages any more.

Can I ask what led up to this fault in the first place? Before the Amiga was known to be faulty, was it working okay for you? Did it happen over night or something?

[sturulez]

Okay, Ive swapped the mainboard with another A1200 i had tucked away. Powered it up and it works fine.
The motherboad that stopped working was a Rev 1A. not sure if that has any effect to it, i know there are a few board Revisions out there and each have their own problems.
Cant see any dull solder joints or leakages.
 
As to what led up to this fault, im not really to sure. I purchased the amiga from amiga kit about 3 years ago and it was working fine till recently. It would freeze during a game and then the screen would go red. I found that if turned the power off for about 5 mins then turned it back on again it was fine.