ASUS 華碩 90W 19V 4.74A 變壓器 X55 X61 U47 U46 U56 U36 U50 U30 K52 K53 K43 K70 K72 K73 N72 N43 N80 M50 N75 N73 N70 N55 N60 N53 K40 X72 X73 U31 U41 X35 X41 P31 P41 PRO35 P43 A8 F8 F80 F50 A40 X43 X50 X52 X61 X71 K41 K42 K60 K50 K61 K62 M51