Gallag help needed

VIPER13

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I don't know if anyone out there is familiar w/Gallag or not, but I have had this game for quite a few years now. I was playing it a couple of weeks ago and it started acting up. First the score would start rapidly increasing, than it started to freeze up and I would get a RAM error in the bottom right corner of the screen. Now, I power it up and I get no picture or sound, just a blank white screen. I tried pulling what chips I could get off the board and made sure that I cleaned them really good before placing them back. Still nothing. Does anyone know what the problem may be? Is there anyway to test the board or find out what RAM chip could possibly be bad? Could it be the power supply? I put a new one in a couple of years back and haven't had any problem up until now. I planned on taking the board out of the cabinet it is in now (Original Taito Zarzon) and putting it in a Galaga cabinet, but now I may just sell the whole thing or try to trade it.
 
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I made a mistake and posted it in the wrong place. I proceeded to move it to the correct forum. Anyways, I checked the power supply and set it up for both 5.1 and 5.2 volts, neither one helped. The one thing that I noticed is that if I turn the machine off then back on the volts at the connection to the board will change slightly. Could this be the power supply or should I try reading the volts from another spot? The power supply is not that old, but when I put it in I never checked the volts, could this have ruined the board or the power supply if it was running to high or to low?
 
Nothing on the monitor, just a white screen. No sound at all either.
 
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