This machine boot all button doesn't work in half an hour, remote control doesn't work, and the red light keeps flashing, flicker frequency as green light blinking frequency when the phone is switched on. At this time to turn it off and then on, the machine does not have any reaction, no light, also can't hear the voice of the relay and. Just like without power.
 
To boot, trouble-free, power supply circuit should be CPU don't work properly. This machine has three CPU, a power control is P board CPU - IC501, one is the DG main CPU board, the other is a D CPU. Because it is a button doesn't work, remote control doesn't work, so the possibility of doubt DG board CPU problem is bigger.
 
 
Based on analysis of surrounding DG board for repair. Because there is no extension cord, so can't measure some parameters. So first rule out the peripheral circuit if there are any problems, so the HC plate and unplug TA plate respectively. Boot commissioning. Remove the TA plate, the same fault. When remove the HC plate, fault disappear.