Well I don't want to send you down the wrong path but it sounds like you may have dove in too deep, this sounds like the classic WPC reset...4.85 may too low for your watch dog circuit. Are the driver board LEDs all showing that you have all the required voltage (5V, 12V, 18V etc..) If not go back and check the BR and Cap, not 100% sure but BR2 and C5 and start there...if you get anything around 8VDC at the BR, you're good. Then move to C5 now this one is critical you must get 5VDC or very close to out of the leg of that cap. If good then move to the Voltage Reg, you should get 4.9 or near that out of the output leg. Do these things first.