Tech: Galaxian PCB w/ Garbage Screen

Archived from groups: rec.games.video.arcade.collecting (More info?)

O.k. I have a Galaxian that is currently displaying a fixed screen of
garbage on power up. This board has been modified to accept a
switcher, in that the diodes at D4-D6 have had one leg lifted from the
board, and jumper wires soldered from the +5v, & +12v edge pins to
coresponding traces. I also noticed that the 78GUIC voltage reg. has
been completely removed, rather poorly as well.

I have searched the NG and found some logs that point out the 2114 RAM
and/or the LS245 as possibilities (athough the 245's are not on this
board). I have made sure that I have good, solid voltages going into
this board. Physically, it is o.k. with no broken traces or
bent/broken pins. I am wondering if the modification may have
something to do with this, or if it is a failure in one of the chips.
Appreciate any assistance on this, and have a great holiday. Thanks
for the time.

Archived from groups: rec.games.video.arcade.collecting (More info?)

Yes, I am located in Ohio. The 2114 RAMs are not socketed...I have
read that the solder pads on these boards aren't the greatest either
for swapping componens...I don't think the mod has done any damage, but
I do not have the means to test any of the chips to see if they are
indeed at fault.