MacBook Pro 15" 2017 A1707 Touchbar No power

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

Good on the diode reading. From my google-fu experience, the diode readings should be ~0.55 on a good CCx pin.

Earlier, the CC2 reading was much higher so it was a suspect.

Remove all power / no battery.

Meter in DIODE mode.

Red meter probe (yes RED) to GROUND.

Black meter probe on each LDO pin on the CD3215. Measure & post the readings for each CD3215 on the logic board.

On other comments - yes, this is a very frustrating and expensive hobby. In the end, there may be no solution for a fix. It is a man vs. machine challenge. Just the same, the experience is priceless, once it is working. The next round will be much easier to tackle.

Thanks for the help and the peptalk !
I have to say I love the learning anyway and to interact with the community like this, so I will try to keep it going .

The readings for LDOs are:
u3100 :
pp1v8_upc_xa_ldod : 0.466
pp3v3_upc_xa_ldo : 0.482
pp1v1_upc_xa_ldo_bmc : 0.498
pp1v8_upc_xa_ldoa : 0.503

u3200
pp1v8_upc_xb_ldod : 0.460
pp3v3_upc_xb_ldo : 0.483
pp1v1_upc_xb_ldo_bmc : 0.477
pp1v8_upc_xb_ldoa : 0.496

ub300:
pp1v8_upc_ta_ldod : 0.453
pp3v3_upc_ta_ldo : 0.450
pp1v1_upc_ta_ldo_bmc : 0.475
pp1v8_upc_ta_ldoa : 0.000

ub400:
pp1v8_upc_tb_ldod : 0L ( so nothing? ) groundpin is 0.000
pp3v3_upc_tb_ldo : 0L again
pp1v1_upc_tb_ldo_bmc : 0.478
pp1v8_upc_tb_ldoa : 0L again

I got a funny feeling about UB400 .
What do you think is up?
Thanks again!

[fr.iglesias]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

Sorry I mean A1708 motherboard Macbook Pro 13 2016 year

[fr.iglesias]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

Hi friends, does anyone have the TBT ROM firmware for A1798 820-00875A motherboard?,
I´ll be really gratefull if someone could help me with this.

Thanks in advance!!

[mon2]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

Good on the diode reading. From my google-fu experience, the diode readings should be ~0.55 on a good CCx pin.

Earlier, the CC2 reading was much higher so it was a suspect.

Remove all power / no battery.

Meter in DIODE mode.

Red meter probe (yes RED) to GROUND.

Black meter probe on each LDO pin on the CD3215. Measure & post the readings for each CD3215 on the logic board.

On other comments - yes, this is a very frustrating and expensive hobby. In the end, there may be no solution for a fix. It is a man vs. machine challenge. Just the same, the experience is priceless, once it is working. The next round will be much easier to tackle.

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

U3200 readings are off. Have you replaced this controller? It should be replaced with the same part #.

Hi,

Thank you, what should the readings be? can´t find it in openboardview.
I replaced it with a new one ( replaced it before but it looked bad )and now it reads 0.53 at both cc points.
Also, it boots with the plug both sides in now - but again to 5.2 V and no rebooting.

More interestingly, UB300 and UB400 side do not go on on any plug orientation now. They used to work both, where one only on one side of USB-c orientation.
The USB power meter I use inline does not go on now on either UB300 or UB400, the diode measurments are the same.

Ideas are welcome, I spend a $100 on CD3215s now, not even sure if supplier chips were good. This is getting very difficult...
I'm kind of done switching CD3215 chips on this board, I get the feeling something may be wrong with it that destroys them, or is that not possible ( or should not)?
Thanks for all the help, hope there is a solution.

[mon2]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

u3200
cc1: 0.58
cc2: 0.74

U3200 readings are off. Have you replaced this controller? It should be replaced with the same part #.

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

A1707 is about power delivery.

Power delivery (PD) lines are the CCx lines on the USB Type C connectors.

Check the diode readings for the:

CCx lines
D+ / D- lines

(Meter in diode mode. Red meter (yes, RED) to ground. Black to point to test).

Most of the boardview files offer DIODE reading values of a known good board. Compare your values against the reference values.

hi, sorry I somehow missed this @mon2 .
here they are :
u3100:
cc1 : 0.59
cc2 : 0.59

u3200
cc1: 0.58
cc2: 0.74

ub300:
cc1: 0.56
cc2: 0.57

ub400:
cc1: 0.56
cc2: 0.57


@powerblackout I have 3.3V on UB2890.
Have an oscilloscope to borrow but never used so would need more instructions.
About missing R41*, those are fine, the do not match the schematics as i saw in the video from Paul Daniels.
CB214 I pit back it should be fine.

Do te diod readings say anything?
Feel free to post that ROM file anyway, can be useful because hard to find.
Can you explain what do to with the oscilloscope?

The ROM chip had some liquid spill so it might actually be that in my case.
Thank you again for the help and support.
For convenience, please find the schematics attached that I am using.
I ordered some chips, they were cheap, I hope they are the rights ones.
I'll try to take this all the way, since I have kind of given up on being able to fix it, so it would be absolutely awesome if we can pull it off anyway

[powerblackout]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

I just found a donor board that was able to get 20V, swapped the TBT ROM but still had the same issue, so your ROM might be fine.

Do you have an oscilloscope? Push it up against the MISO line going into the CD3215 and plug the board in, if you see a short burst of traffic your ROM is probably fine and your problem elsewhere.

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

I found : https://www.aliexpress.com/item/1005003614452960.html
My U2890 shows :

*-8029B ( star is unclear, B might be 8 or 9)
300 (or 800 )
MX25
U3235F

If only the last two lines are important I can order that one and try to program.

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

Do you have a programmer? I can send you a ROM file off of a working TBT chip and you could try flashing it onto yours.

If you purchase a new chip it's not going to have the firmware the CD3215 chips required to get 20v, you'll need to program it unless you get a used one off of a board.

Hi, yes I do, just not sure if I have the proper connector, but can order that.
Do you mean programming the current chip or a new one?
Do you have a good link for a replacement chip on ebay?

BIOS image is appreciated, found them on Rossman forums but behind paywal.
My board is 820-00281-A.
Thank you!

[powerblackout]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

Do you have a programmer? I can send you a ROM file off of a working TBT chip and you could try flashing it onto yours.

If you purchase a new chip it's not going to have the firmware the CD3215 chips required to get 20v, you'll need to program it unless you get a used one off of a board.

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

I watched https://www.youtube.com/watch?v=alhLFikA3g8 after watching the wiki again. Then I understood the ROM is the TB ROM, U2895 not the EFI ROM (SPI?).
That actually looks like it could be my problem.

I do not have a donor board so I will check chip price and post if news. Glad to still be going and learning, even with no reward of a working board, it is rewarding to learn from all of you guys sharing knowledge.
Thanks a lot!

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

hi, thanks that is a great find! I have no voltage on both pins.
Also no short. I found the chip here:
https://www.ebay.com/itm/312661170913
but I am not sure if I want to invest that.
The chip looks good and no power so perhaps problem is power?
Also interestingly I saw no R4106 is on my board, but it does not look like fallen off.
Chip looks clean too but I have cleaned it before so may indeed be dead.
Then I saw R4104 is missing which should power the SPI rom U3906!

Unfortunately no 1.8V on the incoming track there but I think I should try to fix that first . Some light in the darkness, thanks a lot!
[update] R4104 contacts do not look like something was there either. may be it should not be there?
SOC_ROM_SPI_MISO_R read about 0.09V on pin 2 of R4450.
again no short around there.

How likely is it to be the chip?

[powerblackout]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

I understand from the repair wiki that if LDO 1.1 is not short and no voltage, it is the CD3215.

The one I read said lack of 1.1 LDO means it's a ROM issue, try replacing the ROM chip? Can you measure the voltage on your MISO and MOSI lines to the chip?

Here's another thread I found: https://boards.rossmanngroup.com/thr...ldo_bmc.58788/

If we could get a few dumps of good ROMs It would be interesting if this would fix the 1.1v issue..

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

adding:
u3100 - no PP1V1 ( but 1.8 and 3.3 LDO ok ) no short on the rail, but 1.8 on PP3V3_G3H - no short measured on either 1.1 or G3H
U3200 - no 3.3 ( PP3V3_G3H - no short ) but has PP1V1 and 1.8
UB400 now 2.6 on 3.3V LDO and most others nothing. no shorts on any caps.
So now I have PP3V3_G3H issues but no apparent short...

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

if only it would deliver power.
I read : https://repair.wiki/w/Charger_stuck_...nstead_of_20_V a few times and also noticed that my UB400 does not have 1.1V on the LDO.
There is no short either.

I am sick and tired of changing CD3215s by now, did it like 6 times.
This is a hobby and it can cost, but it is no fun.

I found something else that hopefully rings a bell for someone: 2 of my 4 ports work ( usb voltage meter 5.2 V ) when the USB-c cable of the charger is plugged in either way, the other 2 only work if the cable is turned one way and not the other.
I changed the cable and the power board looks good, so I wonder if this is something that can be explained?
The ones that work both ways draw 270 mA, the ones that work one way about 0.015.

At this moment I am losing the motivation a bit to be honest.
I understand from the repair wiki that if LDO 1.1 is not short and no voltage, it is the CD3215. I have tried to replace them all by now, some more than once, so either they are DOA, or I frie them or whatever else I do not understand.
So I'm stuck.

[mon2]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

A1707 is about power delivery.

Power delivery (PD) lines are the CCx lines on the USB Type C connectors.

Check the diode readings for the:

CCx lines
D+ / D- lines

(Meter in diode mode. Red meter (yes, RED) to ground. Black to point to test).

Most of the boardview files offer DIODE reading values of a known good board. Compare your values against the reference values.

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

another update. replaced last cd3215 and then all cd3215s are showing 5.2v and about 20 mA.
Also none loop ( boot ).
Also found:

https://repair.wiki/w/Charger_stuck_...nstead_of_20_V

Very useful!
Started to measure and found one cd3215 (ub400) does not have the LDO 1.1v . There it says it might be the cause of no booting either.
No short on the LDO ( CB404 ).

It says main CD3215 may be problem that is connected to SPI.
Can't imagine one is still dead, but which is the one connected to SPI rom?

[update]
well I'll be. SPI rom seems to be U3906.
Closest on that side is U3100.
I thought to measure that but it seems dead now.
Bloody board ! no more CD3215 spares, end of project until I get new ones.


Anyone had this before, am I missing something else?
Thanks

[openminded]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

I reballed my chips. Just know there is 4 of these. Pain in the ass

absolutely horrible indeed. I replaced all CD3215 s and sill only have 5V. 3 ports show about 300 mA, one about 160 mA.
I have no idea what to do.
Feels like these manufacturers should just be sued for making it hard to take them off with 480 degrees Celcius.

The soldering is a nightmare for a beginner, some parts came of and I think I still miss a capacitor.
kind of impossible to find it and to put it back although trying.

Does anyone know how one could proceed? The direction of a cap matters right? This is a hobby but I am getting so tired of it I might just buy another board and sell this one. It just takes too much time.

Still happy to hear any advice... thank you

[Stephen]

Re: MacBook Pro 15" 2017 A1707 Touchbar No power

I reballed my chips. Just know there is 4 of these. Pain in the ass