If the gal is burning its clearly the main problem. I'd fix that first before assuming anything else.I check CC on this powered off GAL (multi unplugged from mother board).
Pins 3 and 24 are connected to VCC (normal for 24).
Pins 12 and 13 are connected to GND (normal for 12).
Pins 11 and 14 are connected.
Is anything wrong ?