Amiga 1200 motherboard to save!

[Castellen]

I am not going on in further analysis. I am simply limited by my capabilities on making repairs...
In the future I hope to find somebody that is able to repair the mobo! The complete Amiga (without FDD) is safely stored!

I could provide a long complex list of things to check, but without the right equipment and knowledge, I fear you'd be stuck at step 1.

Depending on where you're based, there are various individuals providing repairs.  I offer comprehensive hardware fault tracing and component level repairs from worldwide.  Sending an A1200 main board to NZ is fairly cost effective.  Email me for further details.

Else see the forums for other repair services.

[zipper]

Look here for instance:
http://eab.abime.net/showthread.php?t=81395&highlight=hardware+repair
several countries in Europe - but not in Italy, sorry.

[Chucky]

Well  first step of any Amiga troubleshooting is to look at that powerled.  of some reason this is always skipped as they watch on the SCREEN!.

among the very first things kickstart does it to turn the powerled HIGH, all amigas (with exception of A1000 and Rev 3 a500) starts with powerled on HALF brightness.  So. it shlud go to full brightness after aprox 1 sec.   if this doesn't happen, you either have bad kickstartroms or something that stops the machine to execute the kickstart.   this is usually the hardest things to find.

then you can use my diagrom to test more stuff like bad IRQ och CIA timers, this will also make the amiga to give "black screen" etc.    and USUALLY 99 times of 100 diagrom only starts IF that damn powerled goes full bright.

so CHECK THAT LED for hint on where to start the troubleshooting.  if it DOES go high!  your PSU IS fine.  meaning it atleast deliver 5V (and 12?) it also means that your kickstart most likly IS ok. (as it can execute the code)

[flaviosr]

Well  first step of any Amiga troubleshooting is to look at that powerled.  of some reason this is always skipped as they watch on the SCREEN!.

among the very first things kickstart does it to turn the powerled HIGH, all amigas (with exception of A1000 and Rev 3 a500) starts with powerled on HALF brightness.  So. it shlud go to full brightness after aprox 1 sec.   if this doesn't happen, you either have bad kickstartroms or something that stops the machine to execute the kickstart.   this is usually the hardest things to find.

then you can use my diagrom to test more stuff like bad IRQ och CIA timers, this will also make the amiga to give "black screen" etc.    and USUALLY 99 times of 100 diagrom only starts IF that damn powerled goes full bright.

so CHECK THAT LED for hint on where to start the troubleshooting.  if it DOES go high!  your PSU IS fine.  meaning it atleast deliver 5V (and 12?) it also means that your kickstart most likly IS ok. (as it can execute the code)

The issue is that the led does not blink. It starts and remains steady at half bright... so the issue is that the Amiga does not switch to kickstart... the hard thing to check!

[Acill]

I hate to be the one to say this, but so many 1200's are out there and its honestly not worth the time to repair them for me anymore unless its something easily located within an hour or two. Any more time and you run into it costing more to diagnose than just getting a replacement board.

My advice is to list it for repair parts and get a new board. They are easily found if you avoid ebay for about $150. I have even seen complete machines for $220 if you are good with a PAL unit.

[flaviosr]

I hate to be the one to say this, but so many 1200's are out there and its honestly not worth the time to repair them for me anymore unless its something easily located within an hour or two. Any more time and you run into it costing more to diagnose than just getting a replacement board.

My advice is to list it for repair parts and get a new board. They are easily found if you avoid ebay for about $150. I have even seen complete machines for $220 if you are good with a PAL unit.

My issue is that I started my HOBBY many years ago. When the cost of a plain A1200 was much less than 100 €.
I remember when I bought an A1200 1D4 with a Blizzard 603+ (yes! 68060@50 + SCSI), a Mediator PC1200, in an Elbox case with many many other things at 600 €!
So now I find difficult to pay so much as you write! I look for... occasions... not on ebay!
And anyway there A1200 mobos and A1200 mobos! I personally think that 1D4 mobos are the best (the one that now I would like to repair) and it's not good to sell it!
But I understand what you mean and I can even agree with you up to a certain point.

I think that in the future I will look for somebody to repair this mobo!