The machine doesn't boot, no power supply failure may P board and A board. P board power supply and processor control. Not boot first check P board (P5 23 feet STB5.6 v normal, P5 5 feet did not boot signal, preliminarily concluded that P board is normal. Check A foot board A0323 STB5.6 v is normal also, prove A03 plug-in no problem. IC5400 and IC5401 1 foot is 3.3 V and 1.8 V, respectively. Then check IC4001 3.3 V and 1.8 V power supply 7879 clock, reset to normal, 8 feet and 101 feet don't boot, 2 feet no light output signal, judge IC4001 bad, replace IC4001 boot out of the factory pattern after the machine is OK.TxLservice manual download site