A4000 issues

[Acill]

When you first power on tap the caps lock key immediately and see if it locks on or off before you get past ten times. That will tell you if the CPU board is working for the most part.

[Acill]

Thank you for the links I will try them out and let you guys know

If your caps lock is locking up after 6 or 7 times your CPU isnt initializing. I would pull out the CPU card and clean the pins on the board using isopropyl and try again. MY A4000T had the same issue and its working great now.

Also if you had to install a second CPU and MB in this machine I would get that PSU out ASAP! That sounds like a killer to me.

[Acill]

The board only needs +5V (+/- 10%) to boot, which is from the fat yellow wire on the main board power conector.  Probably not power supply related given your clues so far.

The schematics are easily available.

In terms of fault finding, you need to start with the basics such as are all reset lines inactive (high/5V), are all clocks valid, valid p-p levels on address and data bus lines.  Check the overlay line from U350 is being set after power on, indicating initial ROM data is being read and CIAs can be written to.

Common faults are battery corrosion around U177, U891, etc.  If these parts look corroded, remove them using a SMD rework station and see if the system boots.  It doesn't need these parts fitted to boot, though of course you'll have no RTC or fast memory.

If you can't get anywhere, I can send you an estimate to repair.

http://amiga.serveftp.net

If you want to try and replace SMD I'd recommend getting this rework station. For the price I have found mine to be excellent! Its never let me down. You can practice on old broken cards. It doesnt take long to get a feel for it if you use a good pair of ESD tweezers and a good workstation with lots of light and a magnifier. https://www.adafruit.com/products/1869?gclid=Cj0KEQiAqqO0BRDyo8mkv9y259EBEiQApVQD_Yc1fPcmm8HJAnxk9gvWtZTzqkkB6t9a52lg2f40brEaAlIq8P8HAQ