Joe and Mac Returns- No 1 player Controls

Sypth

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I'm pretty sure it has to do with an IC, I'm just wondering if anyone has tackled this sort of problem and have any advice? The 2 player works fine, I can get into service mode and junk, just can't move since I have no controls. Thanks in advance.
 
I'm pretty sure it has to do with an IC, I'm just wondering if anyone has tackled this sort of problem and have any advice? The 2 player works fine, I can get into service mode and junk, just can't move since I have no controls. Thanks in advance.

give the connector for player 1 the once over again. Then maybe make a ground or logic low probe and probe the control pins and see if that works.
This will tell you that it is/is not a board problem or a connector issue. Then break that problem down and tackle.
 
I know the pins making continuity to the board, checked that with a multimeter. I took out my probe real quick and followed the trace down to a 74LS245, but I got np change in high-low it seemed to all be data.
 
I know the pins making continuity to the board, checked that with a multimeter. I took out my probe real quick and followed the trace down to a 74LS245, but I got np change in high-low it seemed to all be data.

find the player controller pins and ground them one at a time to see if that is actually a board problem. If grounding the control pins works it is a connector wiring issue. If it doesn't work then you have a board issue. The 74ls245 is a octal buss transceiver and I don't think that is your problem. This is the pin out for that chip and you should see lots of activity on most of the pins on that chip....

http://www.ti.com/lit/ds/symlink/sn74ls245.pdf
 
2012-12-07_13-19-37_97.jpg

This is what I'm looking at, it looks like pin 17 (player one start) off the jamma runs to a hole that then runs under the board to the last leg of the resistor array near the 74LS245. Sorry, I'm fairly new to PCB repairs and what not so sorry if I'm not getting it, but you're not talking about grounding the jamma edge correct?
 
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I replaced the 74LS245 (U54) that I traced the start pin off the jamma back to and I can confirm the board now has 1 player controls back!
2012-12-09_21-23-03_140.jpg


Only problem now I noticed was look at the high screen. I'm assuming another IC, but not sure where to start looking...

2012-12-09_21-22-21_387.jpg



*Strike that, it was just the hold being a little bit off.
 
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