Black screen on 3000

[matt3k]

I recently replaced the battery on 3000, that already suffered damage long ago.  (My friends were neglectful with take care of their machines ).

Prior to replacing the battery everything was working perfectly.

I replaced the battery and again it worked fine.  After about 2 hours, we were given a black screen.

The power supply and roms are good, and I reseated all the IC's.

Now all I get is an dim power led and a flash on the monitor if I switch on and off the deinterlacer.

Any thoughts?

[Ral-Clan]

Try removing all SCSI devices (external ones first, then internal).

This is probably not the cause of your problem, but it's worth a try.

I had an Amiga 3000 refuse to start up and behave very strangely when external devices were attached (i.e. the power button would not even turn the machine on when an external device was attached and powered up first).

[matt3k]

Try removing all SCSI devices (external ones first, then internal).

This is probably not the cause of your problem, but it's worth a try.

I had an Amiga 3000 refuse to start up and behave very strangely when external devices were attached (i.e. the power button would not even turn the machine on when an external device was attached and powered up first).

Thanks Ral-Clan for the idea.

I already have all SCSI devices removed.

Wish it was that one...

[lost_loven]

That happened to me once also. The tuning pod where it was mounted had a broken solder joint.. there is 3 points i believe where it is mounted, might wanna check that.
Do you hear the hard drive spin up? what kind of drive is it.. Maybe it needs the scsi prefs to be set up again. I had to put a boot delay of 5 secs to give spin up time for my hd. You might of lost settings when battery died? (that could be a long shot just putting it out there).  Check to see if floppy connections too are all in place. Neve know.

lost

[matt3k]

I hit both tuning pods, they had 2 connections each.  Replaced many custom chips.

The Keyboard light blinks when I turn it on, and I can turn caps on and off.

Still black screen, with dim power led, the monitor turns on from signal being sent.  turning on and off the deinterlacer still flickers the screen.

Any other ideas?

That happened to me once also. The tuning pod where it was mounted had a broken solder joint.. there is 3 points i believe where it is mounted, might wanna check that.
Do you hear the hard drive spin up? what kind of drive is it.. Maybe it needs the scsi prefs to be set up again. I had to put a boot delay of 5 secs to give spin up time for my hd. You might of lost settings when battery died? (that could be a long shot just putting it out there).  Check to see if floppy connections too are all in place. Neve know.

lost

[lost_loven]

Check the amber chip and reseat it? have a 1084 monitor you can test it with see if it even has to do with the video display at all.  Rgb port still worked for me when my vga port went. Maybe bad ram? check that? maybe 2 meg chip and 1 meg fast and see? try with no zip ram in there first.

whats the system spec anyhow?

lost

[Ral-Clan]

Do you still get video out of the composite video out?

[lost_loven]

Do you still get video out of the composite video out?

There is no composite out. The high-end Amiga 3000 and 4000 models lacked composite output of any kind.

could use the a520 modulator and see if it works with that. I bet its the zip ram.


lost.

[Ral-Clan]

There is no composite out. The high-end Amiga 3000 and 4000 models lacked composite output of any kind.

could use the a520 modulator and see if it works with that. I bet its the zip ram.


lost.

Oh, I used to own an A3000 but I didn't use it much.  I'm mostly an A2000 man, which has a composite output.  I still consider the A2000 a high-end Amiga though.

[Azryl]

Check the motherboard crystal, its not far above the 68030 chip. Sometimes they can work loose in the holder.

Az

[matt3k]

There is no composite out. The high-end Amiga 3000 and 4000 models lacked composite output of any kind.

could use the a520 modulator and see if it works with that. I bet its the zip ram.


lost.

The spec is a stock 3k @25MHz, 8 megs zip fast ram, 2 megs chip, latest chipset for everything.

I tried removing all fast and 1 mb of chip with the same result.

Not sure if I hook up my a520 if it will show anything, since the power led isn't cycling as a normal startup.  It starts and stays a dim green.

It was running fine for 2 hours and then it just stopped.  None of the chips seem to be running hot.

A real wing dinger here...

[matt3k]

Check the motherboard crystal, its not far above the 68030 chip. Sometimes they can work loose in the holder.

Az

The crystals on my motherboard are surface mounts.  I did hit the solder, to be sure...

[lost_loven]

have you looked at this page ?

http://amiga.serveftp.net/A3000_HardwareGuide/booting-problems.html

lost

edit: by chance is all jumpers on motherboard in place???

[Kremlar]

Is SCSI termination correct?  Even with no drive I had black screen boot issues if there was no termination.

Also my rev motherboard required a SCSI drive attached or I would get a black screen on boot.

[matt3k]

have you looked at this page ?

http://amiga.serveftp.net/A3000_HardwareGuide/booting-problems.html

lost

edit: by chance is all jumpers on motherboard in place???

I will look at them, but it was running fine for 2 hours, so I don't think that could be it.  But, here hoping ...

Yes, I went to the link for suggestions.  I should test the caps locks to see if the cpu if responsive.  The caps lock works but I have to do it multiple times to see if cpu is working.

Thanks for all the help.