Hp Pavilion G4 Dead Repair 3v & 5v ic missing and No Display Problem

Hp Pavilion G4 Dead Repair and No Display Problem.
Fault step down ic
Lenovo B41-30
Lenovo B51-30
La-C292P Dead Repair 19 Volt shorting
fault 19v Adaptor Line short
Faulty component NPC (Non Polorise Capacitor)
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