Newly acquired A2000 problem

[David Wright]

No video but black screen on boot up. Took out all the video toaster and relevant boards, nothing.
I assume that blue barrel is my battery, some leakage but doesn't appear to be on board. Still would like to know the easiest way to remove.

Also, what is the chip added with the 3m cable, chip ram upgrade?

Any basic procedures to diagnose this?

[David Wright]

I did try removing all components but not rom switcher, will try it.
Also noticed to my surprise a megachip expansion on board.

Should I be able to see floppy light activity when inserting disk? No led light on hd either, spins but nothing else.

I will try the rom switcher next.

[David Wright]

Removed everything but the two floppies, and no insert disk, no click, no display and nothing happens when I insert floppy.

To summarize,
I removed accelerator, scsi card/HD, and video toaster.
Turn on, still black, no clicking or insert prompt. No activity when I insert floppy.

I have (from what you tell me) is a rom switcher and a Mega chip chipram expander. Both run a clip that attaches to , I presume, the Gary chip.

[David Wright]

Here is photo after battery removal.
Reseated a few chips including rom switcher.
Nothing yet, will reseat and clean cpu.

Thanks

[David Wright]

I did rock the battery out, kind of indelicate I know. I have a 4000 that needs done too, can I just snip that out?

This man gave me a lifetime of his Amiga video business. Tons of disks, cds, manuals , original boxed graphics and productivity. Huge, I say.

The 4000 works fine now that toaster hardware is out and displays quite nice with hdmi to scart convertor.

Back to the 2000. I was thinking of taking my Vampire out of the 500 to see if that works and disable the rom switcher. I don't know if Mega chip is an issue either. Power does spin the Ricoh Reader drive (never seen that before) which is in the cd drive bay. When HD card and drive were in zorro slot , power was getting to that.

I did see a bit of green corrosion a few pins of the cpu which I cleaned as best I could.

[David Wright]

Yes, there is a life represented here with what I received. This man retired from teaching in his 50's and started a video production business over 25 years ago with Amigas. Eventually he went all Mac but the first thing we talked about is the sad day when Commodore was no more. He upgraded often and consistently, with everything imaginable. There a few still shrinkwrapped audi devices and software like Lightwave.
HE WAS GOING TO THE RECYCLING CENTER WITH THIS!

Anywho, I reseated more chips, cleaned more, took off rom switcher. May have to look into a replacement MB. I want this back with that nice accelerator, Video toaster and to see what is on those 50mb Rickoh cartridges.

[David Wright]

Revision 4.2. Not good?

[David Wright]

Took out MB and took this photo of back. Note the battery area but also the attached wire on the bottom right, some kind of trace repair?
(Battery is top, just left of center)

[David Wright]

Tried the j300 jumper, no luck.
Looks like I might piece this thing out, not worth the money to fix.

I have tried:
Disabling rom swithcher and using one rom
Removed Megachip and used just the agnus
Reseated cpu and most chips
Cleaned as well as possible
All with just psu and floppies attached nothing more

[David Wright]

An update without a change as I came back to this.
Replaced rom swithcher with one rom , a new 3.1
resocketed and cleaned cia chip.

I took better photos of front and back. That wire on the back bothers me. I show in photo: looks like to an expansion socket ( don't know what that is) to the first Cia chip.

I keep reading that if the system hangs at a light gray chip, cpu is ok but possibly something with Cia chip. Which keeps bothering me with that wire in the back. What is that for?

Also no Df0 light comes on or click.

(thanks Acill for the offer, but too much money to invest in another amiga, just want to learn on this one)