Nokia lumia 920 charging problem creates due to strip or charging ic. We can solve this issue by following some easy methods, First confirm strip is ok or change strip, second check charging ic and fuse. If fuse shows no continuity then short the fuse with jumper wire. Follow the diagram below and apply jumpers. Some time mobile shows charging not supported option on screen, this fault occur due to shortage in circuit. Clean the circuit with electronics cleaner and apply normal heat with heat gun.