MacBook 13" charger circuit

I have a MacBook 13" (not under warranty). When the charger is connected it
does not light or charge the battery. I have tested the battery and charger
on another MacBook and they are fine. I have reset PRAM and SMC. Cleaned
both the charger contacts and the ones on the computer.

Occasionally if I leave the charger connected to the computer for several
minutes I get a faint flickering light (I cant even really tell if the light
is green or orange or sort of both colors combined)

I am reading dual voltages at random spots in the laptop with the AC charger
connected.

My guess is that something has burnt out on the main logic board. I have the
computer open and have found one fuse (F 790) that is in tact.

Can someone with a service manual give me some test points and possible
components (voltages, etc) to check.

Thanks


.

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