Whoa, whoa, WHOA!
Find the problem with that machine first-- BEFORE you write me an open check for that board.
Let's troubleshoot this together.
First of all- you mentioned a "missing cable" or some such thing. Can you photograph it and post it?
Do you own a multimeter? If not, BUY ONE.
In arcade games, line voltage (wall socket juice) is VAC and stuff off of the power supply is DC. I know for a fact that Turbo Outrun has a switching power supply. If that turkey goes bad, the game is dead. Check it FIRST. If the monitor works and the game is dead, that is usually the culprit.
And the great thing is that power supplies are cheap, and if they aren't as cheap as you like, I can sell you one cheaper.
While I am a tech, I am not the greatest tech on this forum (not by a longshot) so if you have questions, PHOTOGRAPH and post what you have questions on! I can even cross reference a Turbo Outrun machine if you need it.
Let's get that puppy runnin'.
APf