820-00165 Charging Problem

[mon2]

Re: 820-00165 Charging Problem

These readings look ok. When the battery is charging, you see the magsafe head turn orange?

When the adapter is removed, the battery can continue to power the laptop? You can use the laptop on battery power for a normal period of time or does it discharge quickly?

[Instafixx]

Re: 820-00165 Charging Problem

These readings look ok. When the battery is charging, you see the magsafe head turn orange?

When the adapter is removed, the battery can continue to power the laptop? You can use the laptop on battery power for a normal period of time or does it discharge quickly?

Yes Orange Light is there.

Yes the battery powers the laptop.

Yes can you use the laptop on battery power for a decent time.

[mon2]

Re: 820-00165 Charging Problem

When the battery is not charging, do you still see the battery graphic or does it show that the battery is missing symbol?

You can see the different graphics by removing the battery.

[Instafixx]

Re: 820-00165 Charging Problem

When the battery is not charging, do you still see the battery graphic or does it show that the battery is missing symbol?

You can see the different graphics by removing the battery.

It shows normal battery icon when it runs off a battery

[mon2]

Re: 820-00165 Charging Problem

Yes but when the adapter does not charge the battery, do you still see a battery symbol?

[Instafixx]

Re: 820-00165 Charging Problem

Yes.

[mon2]

Re: 820-00165 Charging Problem

I missed your post #20. If possible, replace this mosfet.

The resistance should not be low unless it is defective.

[Instafixx]

Re: 820-00165 Charging Problem

See attached.

Measure the voltage to ground of:

source (1-2-3)
gate (4)
drain (5-6-7-8)

pins of the battery mosfet @ Q7155 when:

a) using the non-working / flaky original charger - interested in the voltage readings when the battery is NOT charging

b) the battery is charging with your DC power supply

Hi,
So after 2 Days, the macbook was just kept.
Laptop isnt charging right now from the Original Charger

Charger Connected but Not Charging (No Green/Orange Light). Battery Connected. Macbook is on.

Voltage to Ground

Source is 7.8V
Gate is 1V
Drain is 7.8V

Charger Connected but Not Charging (No Green/Orange Light). Battery Disconnected. Macbook is off.

Voltage to Ground

Source is 1.4V
Gate is 0.1V
Drain is 1.4V

Now i think you can be double sure if the mosfet is faulty or not.

Again Posting Resistance.
All Power Removed. Battery Disconnected.


1-8 = Starts at 0 for 1 second then it starts moving up from 9.2k and keeps going up till the time you keep holding. i left it at 49.3 k

1-4 = 8.45M

4-8 = Its a solid 9.2M

[mon2]

Re: 820-00165 Charging Problem

If you do not see a green or orange light on the magsafe head, then the single wire circuit inside the magsafe is not being powered.

1) with IPA, clean the magsafe magnetic contacts on the receiving end of the logic board.

2) if possible, test with a different LIO board

3) review the presence of PP3V42_G3H rail that is required for the magsafe circuit to function.

Also monitor the voltage at D7005, pin #3 (PP3V42_G3H). If the voltage is absent with the battery removed, then monitor pin #1 and #2 of D7005. With the power adapter connected, pin #3 must offer a high voltage to create PP3V42_G3H. Otherwise the mosfet circuit at Q7010 is not working. Measure each pin on Q7010 if unit does not power up with a light on the magsafe head.

Post all measurements.

[Instafixx]

Re: 820-00165 Charging Problem

If you do not see a green or orange light on the magsafe head, then the single wire circuit inside the magsafe is not being powered.

1) with IPA, clean the magsafe magnetic contacts on the receiving end of the logic board.

2) if possible, test with a different LIO board

3) review the presence of PP3V42_G3H rail that is required for the magsafe circuit to function.

Also monitor the voltage at D7005, pin #3 (PP3V42_G3H). If the voltage is absent with the battery removed, then monitor pin #1 and #2 of D7005. With the power adapter connected, pin #3 must offer a high voltage to create PP3V42_G3H. Otherwise the mosfet circuit at Q7010 is not working. Measure each pin on Q7010 if unit does not power up with a light on the magsafe head.

Post all measurements.

D7005

With Battery Disconnected and Charger Plugged in but no light on charger

D7005
1 =1.02V
2= 0.09V
3= 0.63V

Q7010
4 Pins on the Left and 3 Pins on the Right
1=0.07
2=0.07
3=0.07
4=0.78
5=0.07
6=0.07
7=0.07
8=0.87


This is already a a different LIO Board.
Right Now i know that if we connect it to a DC Power Supply it ll start charging and Post that the Original Magsafe will also start wroking.

The macbook battery is currently charged and can switch on.

[mon2]

Re: 820-00165 Charging Problem

The adapter is not supplying a voltage.

Disconnect the power adapter and check the magsafe contacts. Reconnect again and repeat till you can see the green light.

Are the magsafe contacts clean of all residue? They should be shiny.

Is the power adapter 100% original? Do you have another magsafe adapter you can use for testing?

Yes, the logic board works but only with a charged battery. For this case, the logic board does not work with the power adapter because the adapter is in shutdown mode.

There is a single wire communication that occurs between the logic board and the original power adapter. At first power up, a low current power supply is used to start the communication using the 3v42 rail. If thus communication fails, the adapter shuts off.

The fixed power supply works because it ignores the single wire communication and is always on.

Replace the cable between the LIO board and the main logic board and test again.

[Instafixx]

Re: 820-00165 Charging Problem

The adapter is not supplying a voltage.

Disconnect the power adapter and check the magsafe contacts. Reconnect again and repeat till you can see the green light.

Are the magsafe contacts clean of all residue? They should be shiny.

Is the power adapter 100% original? Do you have another magsafe adapter you can use for testing?

Yes, the logic board works but only with a charged battery. For this case, the logic board does not work with the power adapter because the adapter is in shutdown mode.

There is a single wire communication that occurs between the logic board and the original power adapter. At first power up, a low current power supply is used to start the communication using the 3v42 rail. If thus communication fails, the adapter shuts off.

The fixed power supply works because it ignores the single wire communication and is always on.

Replace the cable between the LIO board and the main logic board and test again.

Replaced the Cable.
Repalced the Small Board.
Tried with 2-3 Magsafe CHargers.

Same Issue.
Tried with a Magsafe CHarger that has a cable changed.

Still Same.

This is so weird.

[mon2]

Re: 820-00165 Charging Problem

Remove D7005 dual diode. Do not connect the battery as that works fine.

Attach the power adapter and monitor the voltage on pin #2 of the removed D7005 diode pcb pad.

This is the voltage feed from the power adapter.

What voltage to ground do you read on the meter?

Test this a few times.

[mon2]

Re: 820-00165 Charging Problem

Power cycle the adapter and monitor pin #2 of the dual diode pcb pad for the voltage to ground.

[Instafixx]

Re: 820-00165 Charging Problem

Power cycle the adapter and monitor pin #2 of the dual diode pcb pad for the voltage to ground.

Its 0 Volts. On all pins .

[mon2]

Re: 820-00165 Charging Problem

The charger startup process
When the Magsafe connector is plugged into a Mac, a lot more happens than you might expect. I believe the following steps take place:
The charger provides a very low current (about 100 µA) 6 volt signal on the power pins (3 volts for Magsafe 2).
When the Magsafe connector is plugged into the Mac, the Mac applies a resistive load (e.g. 39.41KΩ), pulling the power input low to about 1.7 volts.
The charger detects the power input has been pulled low, but not too low. (A short or a significant load will not enable the charger.) After exactly one second, the charger switches to full voltage (14.85 to 20 volts depending on model and wattage). There's a 16-bit microprocessor inside the charger to control this and other charger functions.
The Mac detects the full voltage on the power input and reads the charger ID using the 1-Wire protocol.
If the Mac is happy with the charger ID, it switches the power input to the internal power conversion circuit and starts using the input power. The Mac switches on the appropriate LED on the connector using the 1-Wire protocol.

From:
http://www.righto.com/2013/06/teardo...gsafe.html?m=1

It is a must read on the charger operation.

The original adapter will shut down if the resistive load is not detected as per this article. You have this event.

[mon2]

Re: 820-00165 Charging Problem

You should measure the voltage at the magnetic connector pins on the LIO daughter board. The decision for the adapter operation is made there.

A work around is to use a fake adapter that does not care about this soft start of the power adapter. They are always 'hot' and cause sparks when the pogo pins touch the metal casing of the A1466 chassis. Just a FYI.

Tons of fake adapters on eBay, etc.

[mon2]

Re: 820-00165 Charging Problem

Also worth a viewing:

https://youtu.be/v_8yxaEL5xU

[reformatt]

Re: 820-00165 Charging Problem

I did say earlier that Q7180 usually causes this fault with genuine magsafes because it interferes with load detection.

[mon2]

Re: 820-00165 Charging Problem

I did say earlier that Q7180 usually causes this fault with genuine magsafes because it interferes with load detection.

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.