Secondary boot power job, grating and the sound and picture are out of sync, field frequency adjustment knob does not work, keying on the machine and the remote control functions are normal, the N001 to normal. Problem 12VI power without into A1 corresponding circuits.

Check A1 associated with PCB-free break, measure +12V voltage is "0". Check for 12V power supply wire, found that motherboards 12V power supply to the A1 Board solder unsoldering, welding again when troubleshooting.
Because no 12V supply A1 Board, adjust the vertical sync when the potentiometer and the contrast of potentiometer, potentiometer voltage cannot be changed, causing this failure.