Technical Support macbook air with magsafe adaptor not out 16.5v

[Gulab]

please guide me
how magsafe adaptor out 16.5v
because when i connect it to laptop at motherboard
j7000 pin 1 and 2 have 0.50v only
what is the main requirement for out 16.5v from adaptor
please guide me
and
what is the use of centre pin in magsafe adaptor and how it works

 

[Hosein Asadolahi]

please guide me
how magsafe adaptor out 16.5v
because when i connect it to laptop at motherboard
j7000 pin 1 and 2 have 0.50v only
what is the main requirement for out 16.5v from adaptor
please guide me
and
what is the use of centre pin in magsafe adaptor and how it works

i work on this video bro . i share it as soon as possible .