820-01700 Not charging, works with battery

[nebula]

Hi all, I'm new (posting) to the forums so please be gentle.

This 16" Macbook came in not charging, was running on battery but all but one USB-C port were registering voltage of 20V 0A. UB300 was getting warm and showing 5V/0V on each side of its USB-C connector. I replaced the CD3217B and now I get 20V 0A on all but the corresponding port for UB300 which shows 20V 0.004A. I have also replaced charging IC U7000 with the same results. The board shows 5V when battery not connected and won't boot. I am using a 96W non OEM charger.

 

[2informaticos]

First of all, welcome to the forum!

I recommend to get all ORIGINAL APPLE set of chargers.
So you get 0.004A one port only?
Compare diode mode to ground readings between all USB-C ports.
Do you get correct LDOs on all them?

 

[nebula]

Hi again, sorry for the crappy formatting...

​	UB300​	UB400​	UB3100​	UB3200​
​	​	​	​	​
PP1V5_UPC_TA_LDO_CORE​	1.577V​	1.570V​	1.576V​	1.570V​
​	​	​	​	​
PP3V3_UPC_VA_LDO​	3.435V​	3.334V​	3.360V​	3.360V​
​	​	​	​	​
PP3V3_G3H_RTC_X​	3.338V​	3.338V​	3.366V​	3.335V​
​	​	​	​	​
PP1V5_UPC_TA_LDO_CORE​	0.485​	0.485​	0.481​	0.488​
​	​	​	​	​
PP3V3_UPC_VA_LDO​	0.475​	0.475​	0.467​	0.454​
​	​	​	​	​
PP3V3_G3H_RTC_X​	0.38​	0.38​	0.358​	0.378​

Sorry if I haven't fully understood required readings.
I've now tested with original Apple 96W charger and lead, 20V 0.004A on top right USB-C connector only.

Un saludo.

 

[2informaticos]

Please, use schematic refferences, instead of left/right, top/bottom, etc.

Check and compare diode mode readings between pages 32 & 112.
You may have 1 or more CD3217 bad.
All USB-C ports must have the same behavior.
Remove their connecors from the shell and inspect the terminals.

Actually, with charged battery, machine turns on?

 

[nebula]

OK I'll try another CD3217 as I have just received another batch.

The Macbook works with the battery.

 

[2informaticos]

Then your problem is located on USB-C areas.
Be sure U2890 and UB090 have good solders and traces.
Just in case, you can try to reflash them; make backup first!

 

[nebula]

Changed CB300 with same outcome. I have ordered some USON-8 templates from PCBWay, do you have a dump for U2890/UB090 or know of firmware dump source?

 

[2informaticos]

A2141 820-01700-A U2890.bin

drive.google.com

A2141 820-01700-A UB090.bin

drive.google.com

 

[nebula]

Hi, I reflashed UB090 and U2890 and now I am getting 20V 0.065A on all ports with and without battery connected. The Macbook will not boot at all now.

 

[2informaticos]

Is the battery charging now?
Not booting with battery at all?

Try DFU restore, if no data need to save.

 

[nebula]

Not charging, not booting with battery... I'll speak to the owner with regards to data.

 

[nebula]

OK, I attempted DFU restore with original apple charger and Thunderbolt 3 cable, all I get every attempt is:

'Gave up waiting for device to transition from DFU to DFU state [com.apple.MobileDevice.MobileRestore - 0FCA (4042)] . Target Macbook is at 20V 0.066A most of the time.

Should I reflash UB090 and U2890 back to original firmware? It would at least boot on battery before the reflash.

 

[2informaticos]

Yes, put back TBT ROMs.
Then try DFU again.

 

[nebula]

I reflashed the 2 TBT ROMs, I get the same error message when attempting DFU restore although 5V 0.270A is now showing.

 

[2informaticos]

Probably not good ROM files, if got 20V before reflashing.

Still not working with battery?

 

[nebula]

No, wont work with battery now, I had 20V before and after reflashing with the dumps you provided, with the original I now get 5V

 

[2informaticos]

If you didn't move anything on the board, then something reacted to the heat.
Maybe need to resolder/reball CD3217 chips.

 

[nebula]

I've reflowed everything on that side, still no joy. I'm awaiting new CD3217 but I feel I'm wasting my time on this board now.

Would it be worth replacing ALL the CD3217s? I only originally replaced the two on the side where one was faulty/getting hot.