Make sure dip switch 8 is offHello, I have a problem with an mvf1 motherboard that does not start and has power. The red led is on. Could it be the power supply? Best regards
It could be a loose 5v Jamma connection to the Jamma edge or your Jamma edge could be dirty and you may have to clean it using an eraser and q-tip.It starts sometimes fine.
Clean the contacts and still the same.It could be a loose 5v Jamma connection to the Jamma edge or your Jamma edge could be dirty and you may have to clean it using an eraser and q-tip.
BB
Nothing on the screen, only the power led is illuminated before, yes, I heard clicks. I have also tried to remove a cartridge and the checkered screen does not appear.What are you getting on the screen? Do you hear any clicking sound?
BB
This is what happens on the original bios screen.Try making sure you bios chip is firmly in or swap it out for another one.
BB
I have put the other larger motherboard and the same thing happens to me.thats how it looks when it can't boot, often caused by severed traces to the BIOS that aren't conducting when they should
best is to check the continuity of each pin/trace from the CPU to the BIOS, see attached pic, I use that as help when I have MVS with these problems
don't get confused by the different numbering systems (thats why I added the pins of the CPU on the BIOS IC)
one starts with 0, the other one with 1
oh well, best thing about standards is that there is so many of them..
thanks for listening merry christmas.forgot to say that a weak PSU can cause that as well IME, so yeah the supergun voltages should be checked