520ST C070243 4mb RAM upgrade - only 1mb

[coonsgm]

So my 520ST 4mb RAM upgrade has been working wonderfully for the past two years or so. I just powered it on tonight and instead of a long 4mb RAM check (running TOS 2.06) it showed the short 1mb RAM check.

This is the machine I installed my ST536 in a month or so ago and prior to that it had a TF536 in it.

I was thinking that if a RAM chip went bad, it would show 2mb of RAM and not 1mb. Any ideas of where to start troubleshooting? Has anyone seen something like this before?

Thanks!!

[coonsgm]

I posted too soon. Turns out one of the lines running underneath the board was poked through by a pin on the bottom of the board.

All good now :)

[rubber_jonnie]

I posted too soon. Turns out one of the lines running underneath the board was poked through by a pin on the bottom of the board.

All good now :)

Don't you just love it when a fix is that quick :)

[coonsgm]

I posted too soon. Turns out one of the lines running underneath the board was poked through by a pin on the bottom of the board.

All good now :)

Don't you just love it when a fix is that quick :)

Oh I do, believe me, I have enough of the "I haven't a clue what just happened" ones as it is.