MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

S-D 5.17k
S-G open
G-D open

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

S-D 5.17k

this is a very low resistance for a mosfet.

Remove this part and check the same pins when the part is off the logic board.

Do you still see 5k17 ohms across S-D pins ? (checking on the mosfet; not the logic board)

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

That part may take a while.
No hot air at work yet, not to mention training (don’t want to butcher it)
I guess this has come to a halt then, unless there is something else close by that I can check.
Do have hot tweezers at work if needed for caps an resistors.

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

You should make some friends @ Nordic Semiconductor (OSLO) - they are a world leader on wireless technology (BLE). For sure they will have the tools or hit up one of the local cell phone shops for assistance.

In the meantime, you can order some spare parts from Aliexpress for this mosfet and others if you need them.

We own the Quick clone from BEST, model 863 hot air station and am happy with it. That, along with some nice tweezers and flux and you have a great start. A local cell phone repair shop should be able to replace this part in 15-20 minutes. Based on the low resistance, it should be replaced.

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Thanks!
I’ll see what to do.
Can we somewhat exclude the ISL for now?

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Suggest that you source (Aliexpress) a few of each of the parts for this repair:

1) the ISL6259HRTZ (does not hurt to have spares)

2) SI7137DP (battery mosfet) ; 2-3 pieces

Here is a store we use often and trust:

https://www.aliexpress.com/item/3279...d=ut7IiadhWFvL

And their link for the ISL part:

https://www.aliexpress.com/item/3290...d=P1fUtC4yfFZd

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Perfect!

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

For some weird reason (discharge maybe?) Q7055 is now in the megaohms range between drain and sink (a bit unstable in value).

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Quick update: No Change

Finally had the courage to do it myself after some dry running on wreck boards.
Preparation with kapton and enough tacky flux was key.
Started with Q7055, no charge, then ISL (the scariest of them all).
Status is the same, but I have not tried booting it yet to see if battery is detected.
It still runs on the battery when I unplug the charger.
Voltages around Q7055 is also identical.

Now what...

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Does the logic board run normally with only the adapter? (with no battery)

What is the voltage of PPBUS_G3H to ground (measure @ F7040)?

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Does the logic board run normally with only the adapter? (with no battery)

What is the voltage of PPBUS_G3H to ground (measure @ F7040)?

Hi again, and Happy new year!
I get green LED and fan spin with no battery.

PPBUS_G3H at F7040 is 12.59 with and without battery attached.

Don't remember it this is normal behaviour, but after replacing the ISL, I first get a normal fan spin, then after ca 10 secs it ramps up.
I'm not a 100% satisfied with my soldering on the ISL as it has a veeeery slight amount of an angle, but I see no bridges and the points do line up.
Worth re-doing, or would it fail to boot if improperly soldered?

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

I just did a reflow of the ISL and verified that it was floating freely on solder before the "squeeze". Inspected thoroughly and found no obvious solder shorts.
Looks good now, but the situation is the same.

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

According to this video, Q7035 and Q7030 are suspects:
https://www.youtube.com/watch?v=6_kB...=NorthridgeFix
Changing Q7035 in this case solved the No Orange LED issue.
Very similar to my situation.

I've verified the SMC pullup resistors as 2Kohm in circuit (1Kohm in the schematics though), all reaching the ISL.

Since this was in the beginning a very fringe case of "almost" charging (a BAD battery), then none, I believe MOSFets are still under suspicion.

What I don't understand is how Q7030 and Q7035 are related to charging.
Worth a shot?

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

See attached.

PPBUS_G3H voltage is created / regulated by Q7030 & Q7035. These mosfets switch on / off to dial up the desired voltage to power the logic board.

This same rail is used to charge the battery pack.

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

See attached.

PPBUS_G3H voltage is created / regulated by Q7030 & Q7035. These mosfets switch on / off to dial up the desired voltage to power the logic board.

This same rail is used to charge the battery pack.

Thanks for chiming in!

So if one or both of q7030 and q7035 became faulty / weak, it could explain the symtoms?
Enough current to boot, but not charge.

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Yes, it is possible. Consider to replace the HIGH SIDE (Q7030) / LOW SIDE (Q7035) and also the battery mosfet (Q7055).

It is worth testing with a fresh set of mosfets. Believe you have already replaced Q7030 so proceed with the others.

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

Yes, it is possible. Consider to replace the HIGH SIDE (Q7030) / LOW SIDE (Q7035) and also the battery mosfet (Q7055).

It is worth testing with a fresh set of mosfets. Believe you have already replaced Q7030 so proceed with the others.

Q7055 is already replaced, but I can put a fresh one when replacing them all.
Found the fets from the seller you recommended.

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

With no power, meter in lowest resistance scale, measure the resistance between pins 17 & 18 of the ISL chip @ U7000.

This is to confirm that the current measuring loop is correct.

Post the measurement.

[trondl]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

With no power, meter in lowest resistance scale, measure the resistance between pins 17 & 18 of the ISL chip @ U7000.

This is to confirm that the current measuring loop is correct.

Post the measurement.

I believe I verified the CS loop, but will give it another go tomorrow when at work (where the board is located)

[mon2]

Re: MacBook Pro 2010 15" 820-2850 no charge, green light, powers on

It is worth verifying as parts move / fall-off during rework.

If this current loop is broken (saw this last year with a case on this forum that took ~3 weeks to conquer) - then the charger IC will shut down as it believes that power was applied to the battery leg but then was pulled down to 0 volts. This means too high of a load to support so shut off the battery charging.