Help Troubleshooting after replacing Game Chip

[Hawksnest2]

 
This is a long post but hopefully it will be an easy to follow read:

let me give you the back story...

Start with a Working IGT S+ Double Diamond Deluxe  (DDD)

removed SP731 game chip to use BV on/off chip to enable bill validator

when removing SP731 game chip I bent a pin... when I straightened the pin it broke off... I soldered the leg back on...
Replaced repaired SP731 game chip

machine worked...

ordered a replacement SP731 game chip

replacement SP731 game chip arrived

replaced the repaired SP731 chip with the new SP731 chip

turned on machine:
Nothing
  - no spinning reels
  - no error codes
  - only fluorescent tube lights on
  - jackpot key and/or reset button did nothing

removed new SP731 chip re-installed the repaired SP731 chip

machine worked fine

verified via jackpot key that the repaired chip was a 731...
so I suspected bad replacement SP731 chip and requested another one...

new SP731 chip arrived today...

turned off working machine

removed repaired SP731 chip and inserted new SP731 chip

turned on machine...
Nothing again...
  - no spinning reels
  - no error codes
  - only fluorescent tube lights on
  - jackpot key and/or reset button did nothing

so I again re-inserted the repaired SP731 chip...
but this time
Nothing!!!
  - no spinning reels
  - no error codes
  - only fluorescent tube lights on
  - jackpot key and/or reset button did nothing

Now I can't get the machine to respond no matter what SP731 chip I put in it...


Here is where it gets interesting:
so... as a test...
I pulled the main board out of my working IGT S+ RWB machine

put the RWB main board in the DDD machine and
Nothing
  - no spinning reels
  - no error codes
  - only fluorescent tube lights on
  - jackpot key and/or reset button did nothing


put the DDD main board in the RWB machine and
it showed signs of life...
Error 61... which would be expected I think...

so the "Nothing" symptom/issue seems to be with the DDD machine and not the main board


so I don't understand how I can go from working machine.... change the SP chip... and then end up with an issue that does not seem to be on the main board...

any ideas?

I looked at the connector where the main board plugs in... I do not see any evidence of an issue...  and not bent pins on either main board...

[a69mopar]

Check the wire from the power supply to the motherboard,  the motherboard end is prone to fail. You may see signs of heat on the plug. Brown near connectors is bad.  Since you have a working machine you can try swapping it, it's an easy swap.
The timing could be coincidental.
L
Thanks,
Wayne

[Hawksnest2]

THANX Wayne...   I reseat the to connectors to the power supply and it came back to life!!!!

you rock!!!!

Check the wire from the power supply to the motherboard,  the motherboard end is prone to fail. You may see signs of heat on the plug. Brown near connectors is bad.  Since you have a working machine you can try swapping it, it's an easy swap.
The timing could be coincidental.
L
Thanks,
Wayne

[Chris-socal]

Wow!
When I read the original post I was waiting with anticipation to see what the troubleshooting suggestions were. Im impressed.

Hawksnest2, is it working with both game chips?

Chris