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





I strongly doubt there is one - Apple services these machines at the
subassembly level. Suggest you do a comparative, since you have a
second machine available.

Also, I have encountered odd charging issues where the machine was
otherwise working OK when the MagSafe contacts were dirty. Make sure
you clean those too!





I strongly doubt there is one - Apple services these machines at the
subassembly level. Suggest you do a comparative, since you have a
second machine available.

Also, I have encountered odd charging issues where the machine was
otherwise working OK when the MagSafe contacts were dirty. Make sure
you clean those too!


Thanks for your post.

The other machine is not mine so I can't really disassemble it.
Just tried re-cleaning the contacts, didn't help.




Jack B. Pollack wrote:


Sometimes removing the battery and powering up from the charger works to
reset something. I haven't a clue why but its worked a couple of times
for me on a Dell and a HP machine. HTH.

--
Best Regards:
Baron.



Thanks. didn't help