SPACE ATTACK neverending storyyyyy

vernimark

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Novate, Milano, Italy
My Space Attack died last year with some problems.
THis is a dual VIC sega board, like Head On I suppose, anyway last week I decided to spend some nights trying to repair it... so...

Yesterday I changed a LM741 on power supply and now all voltages are ok.
Then changing some parts I could reach this status:
Reset circuit led: off
screen: full of "dots" as shown in the attached picture.

this is what I did:
All RAMs have been changed
All PROMs have been changed (I have another not working PCB)
CPU changed
All reset circuit ICs have been changed
some EPROMs have been changed

Nothing happens if I insert coins or push any button

do you have any idea?

thank you,
marco
 

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