Please help support the site by donating at the link below.https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=8ZRU34U47BESW
Regulator for the Triggers U9, or any of it's support components, C3, C32, C33, C35, C37, R38 or R40 or it could be the MCU not sending the signal to that Regulator. Could be U10 or U11 is shorted also, or any number of other things that I haven't seen before.
As far as the 'whistling' goes, look around the DC-DC converter that does the USB 5v to 3v, U1. Could be that Inductor is going bad, it has some other iffy part or it's getting loaded down wrong. No AN+ to LSY = full Up movement.No GND to LSY = full Down movement. No AN+ to LSX = full Left movement.No GND to LSX = full Right movement.Make sure both POTs have the AN+ (1.8v) and ground they need. AN+ is on TP103 there. Also make sure none of your jumper wires are touching each other or any other solder joints in there.