Power system failure causes for laptop
-Laptop adapter or battery is not connected well with laptop.
-Laptop’s power control panel is not connected well with motherboard.
-Laptop adapter overheats or short circuit occurs in the inside circuitry which causes damage.
-Battery dries rot or short circuit damage.
-Laptop power board breaks.
-Laptop motherboard BIOS failure causes power control panel to fail.
-Short circuit or open circuit occurs on the inside circuitry of laptop liquid crystal screen, power control panel cannot supply power, so the display doesn’t show when start up.
-Laptop memory failure. Low voltage circuitry could not supply power, which causes black-screen.
-Current-limiting resistor (fuse) breaks, so it cannot supply power.
-Lack a group of DC voltage output or the output voltage is unstable.
-Power load ability is bad and it often burns current-limiting resistor-fuse.
-Filter capacitor is broken, and probably the start-up capacitor is open circuit.