Cocktail PCB/Monitor help

[graveyardjohn]

Hi there,

I have used lots of help and advice from you guys when I made my pac-cab http://www.pac-cab.tk, and I've just bought myself a 1979 Japanese Taito Space Invaders cabinet from a UK retro fair. It has the original glass and guts, and these are really black with filth.

It contains an original Mr Do board (2nd revision, soldered straight onto the connectors - which is strange as the controls are only left-right and fire) but when i turn it on, the game starts up but the screen flickers. There is a slightly blue tint on the left hand side of the monitor when it is running, but various sprites and elements of the game jitter and move around the screen. There is sound, albiet very quiet from the speaker.

Just from this, would anyone be able to tell if it is the monitor which is knackered, or the game board itself? All obvious connections seem fine, you can add credits using the service button, and use the 1p controls, but the game screen itself is not easy to see what is happening, and you die quickly.

I'm a bit of an electrical novice I'm afraid, and bought the cocktail on the assumption the insides were all dead and I could replace it with a PC monitor and a PC for mame, but if i can salvage any of it and use a JPAC, i'd rather do that. The guy selling it didn't know there was a Mr Do PCB in it. Looking at all the nasty 30,000 volts type stuff I've read about arcade monitors, I won't feel bad about starting from scratch (don't worry, I'll get an electrican to help me gut it should I need to do that)

Appreciative of any ideas.