MV-1B green screen

hi every body
today ,i want your help because i have a problem with a slot mv-1b who have some times a green monolytic screen or another color,and some times a mosaic screen no clicking and never boot.the 68k is new and i suppose it is the sp1 bios eprom but i don t have another one
please i listen all your ways to try to solve it.
best regards

Is it a green screen with a little line of another color? Maybe a calendar error? Pics would help.

hello
no it is a simple green screen with no line.just green.
2 work ram change by new,nec d4990 change but with the same problem

Before you go anymore down the rabbit hole... You may just want to buy another 1B board they are under $50usd. Super cheap and affordable.

i just want to repair this slot because i like it
it s a passion to do that