820-00165 Charging Problem

[Instafixx]

Re: 820-00165 Charging Problem

Interesting..so remove R7186 (C7185?) to remove this leg of the circuit as a fault?

R7185 is required to keep Q7180 OFF during this testing. R7186 is switched ON / OFF by U7100.

So WHAT TO REMOVE?

[mon2]

Re: 820-00165 Charging Problem

remove R7186 & C7185 to remove this leg of the circuit - see if this improves the detection of the power adapter.

Do not lose these parts so they can be placed back if this does not resolve the fault.

[reformatt]

Re: 820-00165 Charging Problem

The FET is faulty usually, just replace it off a donor. I ordered 10 for stock recently as it's fairly common in the 2nd hand MAC's I buy.

[piernov]

Re: 820-00165 Charging Problem

https://logi.wiki/index.php/Magsafe_Sleep_Mode

[mon2]

Re: 820-00165 Charging Problem

https://logi.wiki/index.php/Magsafe_Sleep_Mode

The FET is faulty usually, just replace it off a donor. I ordered 10 for stock recently as it's fairly common in the 2nd hand MAC's I buy.

Wow. Definitely missed this information. Very good to know. Thanks !!

BTW - We got stung by an eBAY reseller who may still be active with 'authentic power adapters for Macbook'. We were excited and purchased a 10 pack. They feature the markings and logo like the original but are of course FAKE. They spark like mad if the pogo pins touch the metal clamshell of the macbook. Amazing how Apple allows them to sell the stuff..

[reformatt]

Re: 820-00165 Charging Problem

CMIZapper has a tester for genuine Magsafes. It'd be a handy tool, but it's a bit pricey for a tool that just tells you it's a knock off or not. Spark method seems a cheaper option Same goes for the Medusa. Would be justified if I was using it 5 times a day, but it doesn't take long to pop off U6100 and put in a programmer either.

BTW, just noted he has a USB-C version of the Chipmunk tester. Will be grabbing one, as the USB-A one is just so damned useful. It's great for PC lappies too, not just MAC's.

https://www.cmizapper.com/products/magsafe-tester.html
https://www.cmizapper.com/products/usb-tester.html

[mon2]

Re: 820-00165 Charging Problem

We had a prototype working to extract the 1 wire interface vitals but was on a bench that was run over by a drunk driver. She / her insurance will be paying for our equipment for a long time. It is one of assorted widgets we are trying to cram inside a pending FPGA design. Single wire communication is quite well documented.

[Instafixx]

Re: 820-00165 Charging Problem

Thank you everyone for your help. Have changed the Mosfet. It seems to be charging okay now. Is there any way i can be double sure as i dont want the issue to rop randomly after 2-3 days and the customer coming back to me. Thanks in Advance.

[mon2]

Re: 820-00165 Charging Problem

Which mosfet was replaced?

[Instafixx]

Re: 820-00165 Charging Problem

which mosfet was replaced?

q7180

[reformatt]

Re: 820-00165 Charging Problem

Had a customer machine come in today with this fault. Q7180 did not resolve it.

With board on the bench, everything buzzed out ok. With battery only connected it should be close to 0V on R7012 (Q7180 should allow no voltage back from the battery), however I was getting 2V here. I replaced Q7180 again thinking my replacement was bad, even took this off a known working board. So start to look at the biasing, and R7180 was completely corroded off the board. Pads were gone too. Amazing how something you miss seems so obvious once you see it.

Anyway, had to solder a 100K resistor to the test pad next to R7181 and run a jumper wire onto the other side (no other points to connect to on that side) to C7184. This fixed the fault (finally).

[Instafixx]

Re: 820-00165 Charging Problem

Had a customer machine come in today with this fault. Q7180 did not resolve it.

With board on the bench, everything buzzed out ok. With battery only connected it should be close to 0V on R7012 (Q7180 should allow no voltage back from the battery), however I was getting 2V here. I replaced Q7180 again thinking my replacement was bad, even took this off a known working board. So start to look at the biasing, and R7180 was completely corroded off the board. Pads were gone too. Amazing how something you miss seems so obvious once you see it.

Anyway, had to solder a 100K resistor to the test pad next to R7181 and run a jumper wire onto the other side (no other points to connect to on that side) to C7184. This fixed the fault (finally).

Its been a while now and the machine didnt come back so i guess the Mosfet Q1780 did it for me!

But this info is very useful. Thank You!

Kudos to this Forum !

[reformatt]

Re: 820-00165 Charging Problem

So another machine not working with genuine chargers, but completely different cause.

The quick way to test if you have this problem is connect a battery to the board on the bench and check the voltage on R7012 (no Magsafe connected of course). Should be 0V. In this machine, it was about 6V or so. Q7180 was blameless, in fact I still had 6V with that off the board. Fault was a leaky D7005 allowing PPBUS_G3H back onto the PPDCIN_G3H_ISOL line.

[Instafixx]

Re: 820-00165 Charging Problem

So another machine not working with genuine chargers, but completely different cause.

The quick way to test if you have this problem is connect a battery to the board on the bench and check the voltage on R7012 (no Magsafe connected of course). Should be 0V. In this machine, it was about 6V or so. Q7180 was blameless, in fact I still had 6V with that off the board. Fault was a leaky D7005 allowing PPBUS_G3H back onto the PPDCIN_G3H_ISOL line.

Interesting !! Thanks for the info.

[talel90]

Re: 820-00165 Charging Problem

hi ,i had exactly same fault and i changed q7180 as said reformatt and piernov thank you