Main > Main Forum
Looking for help w/ a (Ms.) Pacman board...
<< < (2/2)
mgb:

--- Quote from: orion on June 06, 2013, 12:44:24 pm ---Bad socket at 4M?

--- End quote ---

Yup, definitely may be the case.
   If other repair logs show 4m as a common issue causing the flashing 0
   And you already swapped with a known good chip
Then I'd say try swapping that socket
gonzojoey:
Well, I'm about ready to throw in the towel...
I tested all the RAM in a known working board and it's all good. I tested all the Proms and they are good too. I even went as far as testing every IC in a socket in the good board and they worked..it's gotta be either a bad socket or a bad trace somewhere on the board. Ive already replaced all the caps on the board, the ribbon cable, all the Ram chips and confirmed everything else works on the other board. At this point, I've invested more in parts and time than it would be have cost to exchange the board (I think). I guess that's all part of this hobby :dizzy:.
orion:
The only other thing I know about these boards is that they regulate the power to the needed voltages on the PCB itself. Sometimes the voltage regulators can go bad and cause issues or so I hear. I would swap out that socket first though.
orion:
I narrowed down a problem chip on my pac man the other day just by applying pressure and twisting slightly on all the row 4 chips with the power on till I got it to boot. I swapped the problem chip with another chip i had laying around and now its happy again. Try pushing and slightly twisting that 4-M and see if that does anything.
mgb:
It's also common for resistor packs on the board to go bad.
Navigation
Message Index
Previous page

Go to full version