MacBook 13" charger circuit

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.

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.

Thanks. didn't help

Jack B. Pollack Inscribed thus:

Sorry about that ! Just a guess... Could there be a magnetically operated switch behind the connector.

I assume you've been over the board with a fine-tooth comb looking for possible dry solder joints or cracked copper, particularly in the vicinity of the battery connector and charger input?

With the battery connected, what happens to Vbat when you connect the charger - does it jump up (might take a couple of seconds) or does it suddenly go to a sawtooth waveform, or what?

What happens on the other lines to the battery - do you see a bidirectional I2C transaction taking place?

I assume you've been over the board with a fine-tooth comb looking for possible dry solder joints or cracked copper, particularly in the vicinity of the battery connector and charger input?

With the battery connected, what happens to Vbat when you connect the charger - does it jump up (might take a couple of seconds) or does it suddenly go to a sawtooth waveform, or what?

What happens on the other lines to the battery - do you see a bidirectional I2C transaction taking place?

I check this stuff over the weekend.

I dont under stand this??

Thanks

Well, step 1 - do you have a storage scope?

The battery has an onboard charge controller/gas gauge. The communications protocol is I2C(ish).

Well, step 1 - do you have a storage scope?

The battery has an onboard charge controller/gas gauge. The communications protocol is I2C(ish).

No scope. I see 9V on one of the battery terminals when the charger is connected (battery does not charge and computer doesn't work on AC). I Dont know if there should be voltage on any of the other 5 contacts.

I was able to get my hands on a working mag-safe DC in board over the weekend and swapped it into my system. It didnt help. So I know the problem is definitely on the main board (I also know that the charger is working on another system).

Any other thoughts on what components I could look at?