A4000 sudden death

[spirantho]

I'm not as good with a schematic as you, but I'd strongly suggest trying a known good A3640 or even a 4000/030's 68030 board. Usually malfunctioning chips will show a diagnostic colour on the screen when the 4000 does its selfchecks. Unless the Kickstart is bad, of course, but that's a lot less likely than the CPU board being bad. If the monitor is getting a sync then the display chips should be ok, otherwise you'd get "no signal", and that also implies you're getting a reasonable +5V line.

Where are you in the world? Maybe someone can loan you a 68030 board? I have one spare but it's at my parents' house 150 miles away....

[McTedson]

I'm going to order some replacements for U140 and U141 respectively, just in case.
Unfortunately i got noone i can borrow a 3640 from....

[McTedson]

I'm not as good with a schematic as you, but I'd strongly suggest trying a known good A3640 or even a 4000/030's 68030 board. Usually malfunctioning chips will show a diagnostic colour on the screen when the 4000 does its selfchecks. Unless the Kickstart is bad, of course, but that's a lot less likely than the CPU board being bad. If the monitor is getting a sync then the display chips should be OK, otherwise you'd get "no signal", and that also implies you're getting a reasonable +5V line.

Where are you in the world? Maybe someone can loan you a 68030 board? I have one spare but it's at my parents' house 150 miles away....

Kickstarts are definitely not bad...i got a 3.0 set and a 3.1 set, and tried both. I don't think the system goes up to the point where CPU can start diagnosing the board, and that's why i get no colors on the screen. Unless the chipset on the 4000 does some checks itself ? I can't find any document on how things are going on at the startup of the 4000, chipset-wise.
I'm in Romania, so that's probably even a few more miles than the 150 miles already between you and the board. I appreciate it, thanks

[McTedson]

Does anyone know where I could buy a Fat Gary ??

[alexh]

Most of the Amiga repair centers will sell you one.

http://www.amiga-digital.nl/
http://www.amigacenter.com/
http://amiga.serveftp.net/

Googling for "CSG 390540-02" gives you lots of results for 2nd hand chip suppliers but I dunno how many are real.

[McTedson]

Thank you Alex. Yes, the whole point is to buy something that actually works, from a trusted source, and who better ask than you guys