Problems With My Amiga 4000d, Anyone Can Help?

[piemmeweb]

Hello, i'm experiencing problems with my amiga 4000D:

The system doesn't boot on the first time, the power led flashes and reboot itself for 4-5 times, then the system start but reboot itself when workbench screen appears; after that last reboot the system works with no problems.

Also I have no video output on the video out port, the screen remain black, but the VGA signal on the cybervision 64 card works fine.

I already have replaced all capacitor on mainboard and on the a3640 rev 3.1 card

Anyone can help me ?

thanks!!!

[keropi]

I bet you had the amiga stored for a long time??? just let it powered on, it will fix itself mine did the same thing

[piemmeweb]

Originally Posted by keropi

I bet you had the amiga stored for a long time??? just let it powered on, it will fix itself mine did the same thing

Hello, it's not stored for long time, i'm experiencing problems from few weeks, anybody suggest me to replace capacitors; i replaced all caps but the problem persist.

[Charlie]

Hi piemmeweb,
Random thoughts:
-Apart from caps going bad which you've covered
-State of the battery? It's not eating anything is it?
(you probably checked)
-PSU: It's old, knackered caps (etc) in this will give 'dirty' power possibly marginal voltages too - the kind of thing that tends to improve on warming...
...I hope not, but if your PSU has been mis-behaving it may have partly fried the chipset hence output on RTG card but none on AGA...
...I'd be tempted to strip the mobo down, hack in a new PSU & see what happens.

Oh, let's not forget cleaning socketed components & their contacts, making sure they're properly seated. (SIMS too - esp the ChipRam one)

All the best.

[Loedown]

Greetings,
Power supply.

My Amiga 2000 gives me plenty of problems, but I recently bought an adapter from Amigamaniac and when I have 5 spare minutes, between rebuilding my music rack, making a 12 way through MIDI interface, cleaning up, dealing with the day to day and working, I'll try it.

The old power supplies were never designed to handle all the add ons that we love to put in our Amigas, I would almost 100% bet this is your problem, as well as mine.

Paul

[piemmeweb]

Well, the last step is to take another PSU...

If the AGA chip is damaged, how to replace it?
what's the code of aga chip?
is there a jumper that can enable/disable that?
if I add a flicker fixer (like A2320) can I avoid the aga chip problem?

thanks

[piemmeweb]

I'd like to repair my PSU. Need I to replace capacitors only?

[prowler]

Yes, they're the usual culprits.

Edit: Have a look at this thread:
http://eab.abime.net/showthread.php?t=46557

[rkauer]

Pssst...