Hi guys. I have a mvf1z board and I consolized it. I used it with a 161 in 1 cartridge. It worked very well for a few days but today I turn on the board and not works. I get this garbage:
No audio and no click of death. I get the same pattern with unibios 4.0, original bios and diagnostics bios. Without bios there is the click of death (obviously).
I checked data bus and address bus signals on cpu and ram with a logic probe, most of the address and data signals pulse but some signals don't pulse but stuck high or low. The CE and OE signals on the ram seem ok.
There are no broken traces between the RAM and the CPU buses. I replaced workind and backup ram but nothing has changed.
The board is in very very good condition, there are no traces of corrosion anywhere and the solder mask is perfect (compared to other boards in my possession).
What can I do or check? Thanks.
No audio and no click of death. I get the same pattern with unibios 4.0, original bios and diagnostics bios. Without bios there is the click of death (obviously).
I checked data bus and address bus signals on cpu and ram with a logic probe, most of the address and data signals pulse but some signals don't pulse but stuck high or low. The CE and OE signals on the ram seem ok.
There are no broken traces between the RAM and the CPU buses. I replaced workind and backup ram but nothing has changed.
The board is in very very good condition, there are no traces of corrosion anywhere and the solder mask is perfect (compared to other boards in my possession).
What can I do or check? Thanks.