Open host, find it's TB31224F chip. This is a combined chip, to complete the receiver demodulation, phase-locked loop control, voice compression extension processing functions. TB31224F 4146 feet, T3, etc the receiving of the first circuit, phase-locked loop controlled voltage output received from 46 feet to control the frequency of ... Multimeter measuring 46 feet receive PLL control voltage, found either in standby or in a launching State, the Terminal voltage to 46V, which is obviously not normal. Check TB31224F46 pin peripheral components, C40 capacitor electrolytic fluid outflow, and a PIN has been corrosion. With the same specs capacitors replaced, measure TB31224F46 voltage is 0V. Because T3 C40 close to inductance, will also lead corrosion off of the T3? TB31224F-using a multimeter to measure T3 resistance inductor 4344 feet, it really disconnected, remove the T3, see lead of thin as hair pins are badly corroded. Wipe with alcohol in addition to corrosion, welded to the wire on pin carefully, reinstall the T3, the boot code, troubleshooting.