The aircraft power supply board that P board, circuit is simple, no PFC circuit, there are only two: switch power supply 1 is standby switching power supply, by the standby switch power supply block T880 IC851 and standby power supply transformer. The power supply makes a standby power supply voltage of 18.5 V. 2 is the main switch power supply, is composed of IC830, T801, the main switch power makes all the 24 v power supply voltage. dupservice manual download site
 dupservice manual download site
A, standby power supply circuit: 220 v ac mains after entering the TV, directly to the D895, C885 consisting of a single phase bridge rectifier circuit, rectifier voltage 300 v, added to the standby power transformers 2 feet of T880 P2 side, after T880 internal primary winding - 7 feet P1 end -- -- -- -- -- - to the standby power supply IC851 within 7 feet -- -- -- -- -- - IC power switch tube drain D, within 5 feet of IC, has a low voltage VDD power generation circuit, in the startup phase of switch power supply IC7 feet into rectifying power supply voltage through high resistance circuit, for the power supply, VDD power supply circuit the current is very small, all the way only for oscillation circuit power supply IC. The power supply circuit of 6 v power supply voltage is 5 feet VDD, oscillation and drive circuit of power supply for the IC, drive within 7 feet high power switch tube into the repeated on - off open -- -- -- -- -- -- -- -- -- -- -- state. IC is 4 feet high power switch tube source, grounded. When the switch tube inside the IC conduction, produces the following current: the current from the anode of D895 -- -- -- -- -- - T880: P2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- P1 -- -- -- -- -- -- -- -- -- - IC851:7 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 4 feet to the ground. T880 primary coil, the electric current flows through the transformer converts the current to magnetic coil cautiously, in the form of magnetic energy, the electric energy stored within the T880. The current is an initial value to 0 and the linear increase of current. In the switch tube during conduction, transformer secondary coil end is negative, S1 S2 was right in the end, the reverse voltage on rectifier D891, D893 at both ends, as of the pipe. That is when the power switch tube conduction, mains electricity deposited in the transformer.

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