more voltage problems

verymotley

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london, 0nt.
Having strange voltage issue with a jungle hunt. I get 5 volts everywhere on the board except for ic 10, 11, 12, and 20, 21, 22 which are at 4.6 volts. They are all in one square block together in the center of the board. I just put in a new power supply thinking that was the problem but it did not change anything. I also had to turn up the volts on the supply to 5.3 just to get the 5 volts on the board. Is this bad wiring or a board failure. The game plays when first turned on with no sound and bad color then goes to blue screen after 15 minutes or so. But even when the board is cool I still only get 4.6 volts on those 6 locations so I don't know if it is heat related or not. Anyone have any ideas to try.
 
I'd run an 18ga jumper from a heavy 5v trace point to a power pin on one of the chips in the middle of the block to see if it raises it for all of them.

RJ
 
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