any micro exsperts out ther/ got two. in work shop built in.whirpool combo. no heat on mic. checked fuses. changed diode.magnetron seems ok. high humming noise comin from it tho.am thinkin capacitor or transformer, checked al connections. also neff built in , combo. changed diode capacitor. transformer. magnetron seems ok . an wiring. soon as u press start blows 10 amp fuse on pcb panel. any help lads ? 😳