Do not turn on (press the power button, the indicator does not light) (1) bad button(2) loose wiring of power line;(3) the power cord is blocked(4) fuse fusing(5) power crystal IGBT is bad(6) resonance capacitor C103 is bad(7) anisotropic diode(8) transformer bad, no 18V output(9) the substrate assembly is broken (1) check and replace the key board(2) reconnection(3) reconnection or replacement(4) replace(5) replace(6) replace(7) check and replace(8) check and replace(9) replace
