Bagman pcb repair, garbage on screen

dyno

Well-known member
Joined
Apr 11, 2009
Messages
1,644
Reaction score
81
Location
Lower Mainland, Britsh Columbia
I have a bagman pcb that is not working properly , when I power it up all I get is garbage on the screen. When I got the pcb originally it was not working and during shipping some of the traces were damaged, I have fixed all the bad traces I think. I just picked up a cabinet that turns out to be a bagman cabinet and since I have the pcb I figure I would restore it back to a bagman but would like to get the pcb running before I go any futher. Here is a picture of what is coming up
 

Attachments

  • bagmangarbage.jpg
    bagmangarbage.jpg
    99.8 KB · Views: 46
I have a bagman pcb that is not working properly , when I power it up all I get is garbage on the screen. When I got the pcb originally it was not working and during shipping some of the traces were damaged, I have fixed all the bad traces I think. I just picked up a cabinet that turns out to be a bagman cabinet and since I have the pcb I figure I would restore it back to a bagman but would like to get the pcb running before I go any futher. Here is a picture of what is coming up

That is trying to do the ram and rom test and can not finish so that is the 2nd and 3rd thing I would look at.

1st thing is always the voltages and the +5 should be measured at the ttl chips.
 
Hoping I may have found the problem, there are a bunch of broken traces on the board from when it was shipped. I hope after repairing the broken traces the board will work.
 
There are alot of broken traces on the back side of the board, I started to repair them today and think I have most done. When I connect the board up now there is a different screen of garbage and when I check the roms and z80 there is less activity on the pins now than when it had broken traces. The z80 seems to have alot of dead pins now and some of the roms have dead pins now that were active when checked with the logic probe before the traces were repaired.
 
There are alot of broken traces on the back side of the board, I started to repair them today and think I have most done. When I connect the board up now there is a different screen of garbage and when I check the roms and z80 there is less activity on the pins now than when it had broken traces. The z80 seems to have alot of dead pins now and some of the roms have dead pins now that were active when checked with the logic probe before the traces were repaired.

check your work again.

When repairing broken traces I find where the trace goes to a feed through or a chip on either side and solder a short piece of 30 gauge wire and glue to board. Sometimes they are just too close to try to jumper.

Post a high res pic of the repairs you have done and we can look for problems.
 
I actaully did use small wire to connect the broken traces, I will take pcitures of that and the screen of garbage I am getting now. I might undo all my wirig jumping and start from scratch. I checked the baord and the ics are getting 5V so I know it is not a power issue.
 
Here are a few pics, one is of the current screen of garbage that came up after repairing the traces and a few of my trace reapir. Don't laugh at my work please, it's only a hobby and I am still learning:)
 

Attachments

  • bagmangarbage1 001.jpg
    bagmangarbage1 001.jpg
    100 KB · Views: 49
  • bagmangarbage1 002.jpg
    bagmangarbage1 002.jpg
    95.3 KB · Views: 37
  • bagmangarbage1 003.jpg
    bagmangarbage1 003.jpg
    100.1 KB · Views: 35
Hey kb0jjn, saw a post regarding a qbert that is showing the same screen that I have and you said that it is not processing code. Is that the issue I am having? I have checked the voltage and it seems okay.
 
I undid all my trace repair work and the screen went back to the initail picture and there was activyt on the roms and cpu that wasn't there after the trace repair so I must have made a wrong connection. I will redo the trace repair again more carefully. Using my logic probe I noticed the reset pin on the z80 is dead and even when I turn the game off then power it up the reset pin does nothing at all. Also know I have a different screen when I turn the game on which is just a brown screen and I didn't do anyhthing to the board.
 
I don't notice you said that you had tested the questionable traces for continuity. Before you jumper all those traces make sure you test to be certain that they are actually broken.

When I see scratches like that I test every trace that they cross, just to verify. I have sometimes found that the ones I was certain were broke had continuity and others that seemed to be safer from the direction of the scratch to be the ones actually broken.
Also, if the scratch is really deep, consider checking the traces on the other side of the board as well. They may have broken from the stress on the PCB.

Brian.
 
Tested all the traces, there were some that were scratched but still had continuity. I am going to look over the board again tonight. Also I noticed an ic was getting very hot to touch it is a pal16r6cj, is that a programmed ic? From what I have read it sounds like a programmed ic, I found one on ebay but not sure if it would need to be programmed
 
Repaired all traces again now getting a different screen of garbage, there is a reset pin on the board so when I ground it the screen changes to different screens of garbage so it is resetting.Bad rom or ram then?
 
Try reseating or replacing the ROMs. I had this problem on my Super Bagman. I couldn't find S.B. ROMs at the time, so I burned a regular Bagman ROM set. Installed and it worked fine. Still haven't reinstalled S.B. ROMs.
 
Back
Top Bottom