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
Check the Reset line for U4, it's probably gone open somewhere. Also make sure ADDR has 3.3v on it and the SDA/SCL lines are good.Schematic of the Button/Power board where U4 is at is in the 1708 thread here - https://www.acidmods.com/forum/index.php/topic,43981.0.html