Also lets see if Main Arm processor U6 putting out a signal.
WARNING
If you short out this signal, you will have have replace U6. So for safety do what I did in Pic.
Take some electrical tape and make a slit. Put it over U9 exposing only pin 9. Don’t ever short pin 9 with pin 10 of U9.
Get DSO Nano positive probe. Put a needle or solid wire in it. I put TR Mode to SING to capture the signal. I used a mirror in front of me so I could see Nano screen. Put positive probe on pin 9. You should see the signal as in Pics.
If you do see signal, then post likelly your U9 is dead.
