I have a Galaga that I have been working on and finally got the monitor up and working but there isn't any sound. This is how it was when I got it. I have installed and checked a new switching power supply and both 12V and 5V looks good when I just have the AC power wires connected to it. When I power on the whole cab the 12V jumps to 15.8ish area and this is how it was on the old PS and the new one as well. This is measured at the J2 power connector on the PCB. I don't know why the voltage change under load. Also I have several socketed chips on here that have corrosion on them and I have started cleaning the leads but some are very fragile. What should I check next or try next?? I will provide pictures of the corrosion issue on the board in another post.

