Older versions YAESU FT817 have different values of the resistor
to the ACC connector for the +12V output.
10R is ok, older versions have 75R inside, so the ext. Display
Replace the resistor R1235 with an10R size 0504 (main unit backside
close to the ACC connector)
FT817 controlled via bluetooth
bluetooth adapter (~10,00) to the ACC connector
Install software YO3GGX Pocket RXTX Pro (for ANDROID users