The circuit shown in figure, the Q806 c, e, forcibly boot, watch is normal, operation, character is also no problem. Remote shutdown, characters and sounds disappeared, prove the CPU basic normal, only on/standby control failure. Power control output voltage measuring CPU29 foot, on 4 V to 4.5 V and instability (normal should be low level). Standby for 5 v, the measured 29 feet with the VDD between positive and negative to the resistance is less than 1 k Ω. So the lap figure 3 dotted line on the underside of the base plate box circuit, every success. In figure 3, the op-amp with germanium tube 2 ap9 inverting input voltage clamping at 4.7 V (also available resistance partial pressure, of course, but use diode) save trouble, so, as long as the in-phase the boot signal voltage at the input is lower than 4.7 V, can guarantee the op-amp output low voltage, drive power control tube Q806 conduction.qnWservice manual download site