a4000 wierd memory problem : help!

[amigaman1]

Howdy guys,

Managed to score a second a4k 030ec rev b motherboard which seems to have some quirks with the memory banks;

- When I first powered it up it locked up at a yellow post or got past that to an occasional guru then rebooted and repeated the process
- I took it apart to try and isolate the devices, unplugged the hd etc. I pulled out one of the simms so it was left with just a four meg stick and hey what do you know.. boots straight into wb but comes up with half a meg of chipmem
- ok, pull out the remaining 4 meg stick, it powers on but locks at a green post. !! argh.

There's minor signs of the nicad leaking but it's confined to a really small area and hasn't touched any other tracks..

anybody got any ideas??..

[amigaman1]

thanks for clarifying that, I took a closer look at the mb and it makes a lot of sense. My next question is why would it yellow screen with a 2 meg simm in the chip slot or does that suggest the simm is most likely kapuut? If so will I need to find another 2 meg to replace it or will a 4 suffice?.

Thanks again.

[amigaman1]

Thanks for the feedback everyone.

OK, i've got this really bad feeling that when I take the motherboard out i'm going to find corroded some tracks

Because I have 0 electronics know how, is there anyone in the melbourne australia area I might be able to commision to try the battery swap in hope of rescuing my ailing a4k?

[amigaman1]

I've meant to try and make it to one of the meetings for a while now but they always seem to clash with my work schedule.

If I delicately wrench that nicad of the board in the meantime its not going to do any harm right..?

Ok, 50 bucks to anybody in melbourne who's got the time and resources to swap battery and clean up the MB, how does that sound?


 

[amigaman1]

talk about gung ho, I took your advice and with some careful plying lifted the battery out of its mountings, cleaned the terminals and area thoroughly, cabled everythig back up boot into wb and hey! 2 meg chip 4 meg fast!!!!!

Thanks for your input everybody, totally chuffed.

Cheers.