A1534 820-00045 - USB-C not working both sides

[mon2]

Fair enough - confusing with another one of their craptops.

See here and attached:

https://old.repair.wiki/w/A1534_2015...MacBook_Retina

The Dialog Semiconductor (Silego / Renesas) part is acting like the power delivery controller on this model = U4700.

[obelix24]

I've checked one more time and it looks like I have resistance on PP3V3R3V0_AON - 78ohms.
I've tried to replace U7100 for another one but the resistance is still almost same now with replaced U7100 it's 80ohms.

I don't have another U7100 so I have to order it and try to replace again if it help.

I've removed U7100 and without IC (U7100) installed resistance to ground is still 84ohms. Probably something else is faulty ?

[obelix24]

Only difference with this two U7100 is that one is charging 0,3A and other one is taking only 0,05A but both are only 5V

[mon2]

Remove all power. Check the resistance of Q7110 and also of Q7120 mosfets.

Source & Drain
Source & gate
gate & drain

Each package contains 2 mosfets (high side and low side) so be sure to measure each and post all measurements.

[obelix24]

Q7110
CHRG_BUCK_DH to PPDCIN_G3H_CHRG -> 5,2Mohms
CHRG_BUCK_DH to ground OL
CHRG_BUCK_DL to PPDCIN_G3H_CHRG -> 500kOhms
CHRG_BUCK_DH to CHRG_BUCK_DL -> OL

I just noticed one thing. In macOS screen time is showing 24h every day (for approx 4 days) then it's 0h

I still left MacBook turned off but battery connected ... I've checked and lid sensor should be ok as when I close the lid almost full display turns off and when I open it turns on again.

[obelix24]

I just also tried another USB-C port and flex and problem still the same USB working only one side other nothing ...

[mon2]

Measurements for Q7120?

[obelix24]

Q7120
CHRG_BOOST_DL to CHRG_BOOST_SW - 5Mohms
PPVBAT_G3H_CHRG_REG to CHRG_BOOST_DL - 2,5Mohms
PPVBAT_G3H_CHRG_REG to CHRG_PHASE2 - 2,3Mohms
CHRG_BOOST_DL to CHRG_BOOST_DH - 6Mohms

[mon2]

Some measurements for these mosfets have been missed. It is important to check these parts. Let us do this by pin numbers. See attached.

Interested in the resistance between the following pins on Q7110:

pin # 1 (gate1) & pin # 2 (drain1)
pin # 1 (gate1) & pin # 9 (source1)
pin # 9 (source1) & pin # 2 (drain1)

The above is for the HIGH SIDE mosfet checking of Q7110.

Next,

pin # 8 (gate2) & pin # 5 (source2)
pin # 8 (gate2) & pin # 5 (source2)
pin # 5 (source2) & pin # 9 (drain2)

The above is for the LOW SIDE mosfet checking of Q7110.

====================================================

Interested in the resistance between the following pins on Q7120:

pin # 3 (gate1) & pin # 1 (drain1)
pin # 3 (gate1) & pin # 6 (source1)
pin # 6 (source1) & pin # 1 (drain1)

The above is for the HIGH SIDE mosfet checking of Q7120.

Next,

pin # 5 (gate2) & pin # 9 (source2)
pin # 5 (gate2) & pin # 9 (source2)
pin # 9 (source2) & pin # 6 (drain2)

The above is for the LOW SIDE mosfet checking of Q7120.

Post each measurements for the above lines of mosfet checks.

[obelix24]

Q7110
pin # 1 (gate1) & pin # 2 (drain1) - 3Mohms
pin # 1 (gate1) & pin # 9 (source1) - 2,2Mohms
pin # 9 (source1) & pin # 2 (drain1) - 0 ohms

pin # 8 (gate2) & pin # 5 (source2) - 10k ohms
pin # 5 (source2) & pin # 9 (drain2) - 5M ohms

Q7120
pin # 3 (gate1) & pin # 1 (drain1) - 7M ohms
pin # 3 (gate1) & pin # 6 (source1) - 0,9M ohms
pin # 6 (source1) & pin # 1 (drain1) - 2,2M ohms

pin # 5 (gate2) & pin # 9 (source2) - 4M ohms
pin # 9 (source2) & pin # 6 (drain2) - 2,2M ohms

[mon2]

Q7110
pin # 1 (gate1) & pin # 2 (drain1) - 3Mohms
pin # 1 (gate1) & pin # 9 (source1) - 2,2Mohms
pin # 9 (source1) & pin # 2 (drain1) - 0 ohms

pin # 8 (gate2) & pin # 5 (source2) - 10k ohms
pin # 5 (source2) & pin # 9 (drain2) - 5M ohms

Confirm these measurement again - otherwise, with the low resistance measurement this dual mosfet is defective and needs to be replaced.

[obelix24]

I've removed this mosfet and checked pins directly on board
8 and 5 - 10k ohms
9 and 2 - 2,4M ohms

I've checked pins 8 and 5 on mosfet (on the table just mosfet) - OL
9 and 2 - 2,4M ohms

[obelix24]

ok after some time i've returned to this board.

I noticed that there was cracked IC U8310 (there was missing corner where PANEL_P3V3_EN is but macbook was working even with this - strange) i've replaced it.

I've connected official 61W USB-C charger with ampmeter and i was surprised that macbook was taking 19V and charging battery fine. When i turned cable 180 degrees there was nothing ampmeter was not turned on at all. I've tried also 15V (nintendo switch charger as i don;t have official 29/30W from apple) but this should be fine ... also only one side was turning ampmeter and charging with 14,5V ...

I then just tried USB-C cable that was connected to 5V only and to my surprise both sides where working, also in MacOS battery icon was changed and there was symbol that it's connected to power. So it looks to me that USB-C port is ok and is communicating with board.

Then i tested one more thing that i've connected USB-C hub (hdmi out put, USB-A and USB-C) and here on one side i got information in MacOS that "Unplug the accessory using too much power to re-enable USB devices" but there was no output connected to that usb hub )only hub itself.

So now i'm confused ... why one side of USB-C is working fine (charging, ...) and the other side is not charging but it's working when connected 5V only ...

[obelix24]

OK finaly i got it

problem was that PP5V1_S4SW_CC1 was shorted to ground I was checking via diode mode on J4700 PIN52 and the reading was 0,003V

It looks like the trace was going only to U7860 but even with this IC removed short was still there. I've soldered little wire to pin 3 (U7860) and injected 0,9V it was taking only 0,3A and nothing showing on this side of the board, i've flipped the board and U4700 was getting hot after removing this short was gone I've soldered new U4700 and checked diode reading PP5V1_S4SW_CC1 and it was here 0,4V.

After placing board back to case port was fully working 14,5V on both sides

Only issue left is that there is no sound from internal speakers If i connect headphones sound is working. I can adjust sound via keyboard and internal speakers are visible in MacOS by no sound via them

[obelix24]

OK i've found that in right speaker connector there was small piece o wire and this was shorting few pins together, after removal left speaker was working but the right there was no sound. I've replaced right speaker and when i started macbook i got sound from both spekers ...
I was hapy that everything is working, but then i turned off macbook and when i turned it on again there was no sound I tried to reinstall MacOS if it's not just some weird configuration but the sound is still not working.

[obelix24]

ok so audio issue was fixed connector (J6799) on motherboard was broken on one side and wasn't doing good connection. I've replaced it (hot air from bottom on donor board to remove it) and on actual board i've scraped it with soldering iron, cleaned pads and then with hot air it was much faster to solder it back to place