Need help on Amiga4000 Problem

[Rambo60]

I have a Amiga400 Problem where the battery damage U851 Bank2 and U850 Bank3 repair all track to ram we turn Amiga but only show main ram other fast ram is not showing I check all connection pin to all ram all pass we connect the hard drive this will not load and we load floppy disk to check the ram is only show 1912768
If you need more detail let us no as this is the first time I work on a Amiga4000 only work on 500 to 2000 Amiga

 

[hooverphonique]

how do you see that chip ram is 'not showing' ? You can't boot the system, if chip is not working..

 

[Rambo60]

Sorry I have it wrong the main ram is working it the fast ram which is not working as the hard drive it not loading

 

[edd_jedi]

I had exactly the same issue with my A4000, unfortunately because the battery is so close to the RAM it is one of the first things to be affected by battery damage. I sent my board to bebek on here who removed all the RAM modules and cleaned the tracks.