Amiga 2000 - yellow screen on boot, ticking from floppy

[mechy]

Some things to try:
Remove all cards,test with a bare bones system.

Yellow = CPU Exception Before Bootstrap Code is Loaded

Just a guess but did you clean and neutralize the battery damage well,or is there a marginal trace going bad between CPU and ?? if it was not neutralized at time of repair,it will keep eating traces. This sounds like a possible bad trace to me,but never know.

Did you install a new Agnus socket or using the old one,they are notorious for problems after 20-30 years now.

Edit: GadgetUK has a video showing ram can cause this also: https://www.youtube.com/watch?v=qfVxurhovok

The 5721 buster may be problematic for Zorro. some older Toshiba ones were notorious for failure. CSG version usually ok. that being said it could also be the bus buffers.

Move the cable to the other floppy and see if it acts the same. Some Chinon floppies have a electrolytic capacitor on the bottom that can go bad.
I think its just a case of you interrupting loading,but it does sound a bit odd.. try a different workbench disk.

pictures of the battery damage would be great.

I don't think there is a CIA problem but you can swap chips from socket to socket to see if any behavior changes.
Good luck and let us know if you make any progress.

[mechy]

I assume the board is the Floppie209 board. Is there any chance you got a early revision pcb board with bugs?

[mechy]

I recognize the Ricketts name, is this the card you are working with?
https://amiga.resource.cx/exp/cltd2000

C-ltd is the company. most of their stuff was not so great. not sure if it will be hdtoolbox compatible.
it loads the driver from floppy! does not autoboot which means you must create a mountt i guess.
It would be better to get a GVP HCII+8 or A2091 etc. i think. Maybe you can get it working. The driver appears to be on Amiga Resource however.

Wichita (KS), USA    Affiliated Companies
CardCo    Amiga Years
1986 - 1989    Staff
Ed J. Lippert II (management)
Breck Ricketts (hardware / software)

    C-Ltd was founded in 1986 by the owner of CardCo, Ed J. Lippert II.

    Hardware and software development (e.g. SCSI expansions) was done by Creative Microsystems in the first time, that part was taken over by SoftCircuits; some expansions were devloped solely by C-Ltd, though.

    In 1989, C-Ltd was liquidated due to insolvency. Microdyn was offering follow-up support for SCSI systems after C-Ltd went down.

As for serial not working check the 1488/1489 chips also.

[mechy]

The only 5721 buster i have seen trouble with were the old Toshiba branded ones, i think Dave Haynie spoke about this once but i can't seem to find what he said again. They were known to be troublesome in some cases,but the CSG 5721 were fine.

It almost sounds like he has a lot of desoldered chips in sockets which may or may not be new.. lots of contact problems or bad chips from damage.
If using old chips pulled,it may of been better to solder them back in without sockets to avoid connection problems.

[mechy]

With the kronos card in you can run SYSINFO and it should show under Devices what the scsi device name is.
then just set that in HDtoolbox icon info and it should scan it. if you want a better card with ide support you might try a BuddhaFlash