I had the aforementioned laptop come in. It had a minor amount of water damage, primarily around UP800.
After ultrasonic cleaning the Machine booted to external monitor and I was able to recover the owners data.
I was reading a dead short to pin 32 on UP800 so I ordered a replacement. I probably made a mistake in not checking the rest of the diode drops after replacing. So far it no longer fully boots.
It goes from drawing .27A -.7A at 20V never boots or chimes and appears to power cycle.
Anybody have any idea why it would boot fine with the bad UP800 and...
abajor
Senior Member
Last Activity: Today, 08:43 AM
Joined: 02-08-2024
Location: Santa Rosa, CA
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Minor Liquid Damage on 820-02098 A2442. Bad UP800 Booted external monitor before UP800 swap. Not after.
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Not sure how this contributes meaningfully to this post I made over a year ago.... -
A2141 Repair Wiki Error
Not sure if anybody here is a repair wiki editor but
https://repair.wiki/w/MacBook_Pro_A2...w_at_5V_repair
It makes the erroneous claim that "LEFT SIDE TOP PORT IS CONTROLLED BY U3100"
It is not. Just looking at the USB jumper connections on a board View will confirm this, or just remove U3100 and see that the top jack still powers at 5V and the bottom jack is now dead.
Also what does top and bottom even mean when they're both in the same plane. Forward and Rear make more sense. -
I've gotten a little further on this machine.
I discovered that the diode drop for PP5V_S4_X_USBC is around .498V instead of .188V.
That would leave me to believe that several of the pins on U3100 may be open or internally something may be open on that chip?
After re-flowing around the U3100 and the area the soda had corroded I was seeing that the diode drop changed to around .336V.
I got the laptop to boot on the U3100 USBC port and got to the log in screen and thought great and left it to charge overnight.
The next day I came in to look at it and it...Leave a comment:
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A2141 minor liquid damage, U3100 TOP port dead. Periodically boots to 20V ~1A on other USBC ports
Just wondering if anybody has seen this issue. I'm assuming that all of the CD3217's are semi functional for the chips to request 20V from the PSU.
This unit had some soda spattered up into the side vent. I ultrasonic cleaned the board, now getting this weird sometimes requesting 20V behavior, then it goes back to 5.2V ~ 25mA The U3200 jack cycles.
I'm hoping this is just an issue with some components between the TOP Jack and U3100 and not U3100 itself.
Not seeing anything unusual on thermals just some of the power supply inductors getting warm when it's requesting... -
I ended up buying a liquid damaged A2289. After ultrasonic cleaning and replacing and reflowing some passive components I could see that both USBC connectors would request 20V from my Power supply, stabilize for a few seconds then reboot.
Instead of searching that problem I chose to harvest the U3200 CD3217 and put it on the customer machine.
I saw that both ports were requesting 20V after the swap so I put it back together.
The laptop boots right up; however, only the U3100 USBC jack powers up and charges the laptop. The U3200 USBC causes my inline power...Leave a comment:
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Do you think the unit will DFU when the jack corresponding to U3200 (The forward most one) power cycles?
To answer that question it's not detecting in apple configurator.
The only other thing I see on thermal is the U6903 buck converter is active and warmish under thermal. Output voltage at the inductors is 3.3V...Last edited by abajor; 05-20-2025, 12:58 PM.Leave a comment:
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mon2
I just picked up a CD3217 from Amazon which claims to be compatible with my unit. I've improved in that U3200 is no longer shorted on the LDO regs, it's not heating up. The jack that feeds U3200 power cycles. The Jack that powers U3100 stays at 5.2V .4A. My power up sequence stops at P5VG3S_EN staying low.
I have one more CD3217 which I can try from an identical board from the U3100 position. I may try swapping it if there aren't other things I need to check for P5VG3S_EN staying low....Leave a comment:
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Hmmm interesting, from what I've read one of the issues is many of the bigger mac pro's like the A2141 they flash an I2C address into a one time flashable rom, I'm sure there's other things flashed into the room too. I will give a try and report back. I might have a doner if location truly doesn't matter....Leave a comment:
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The CD3217 is conspicuously absent from their site....Leave a comment:
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The search thus far is not great. Plenty of stuff on AliExpress which claim compatible with my model, but no indication of which U3XXX position. If I find A vendor I'll update, might just need to buy donors in hopes of finding a good one....Leave a comment:
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U3200 definitely the culprit reading 1Mohm without it.
Now I'm assuming I must source a CD3217 which is flashed for an a2289 in the U3200 position?...Leave a comment:
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Sorry running around trying to do too much stuff
about 37 Ohms...Leave a comment:
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Both directions read the same! Measuring from c3208....Leave a comment:
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MBP A2289 board 820-01987 Bad U3200?
Just looking for a second opinions before I try to source a CD3217
Rear USBC sits at 5.1V 0.01A
Forward USBC power cycles.
PPBUS_G3H 7.5-8.3V cycles with rear USB, Cycles 0-12.5V on forward USBC
PP3v3_G3H_RTC ~3.9V with rear USBC, cycles 0-5.1 on forward USBC.
PP3v3_UPC_XB_LDO diode drop reads about 0.074V
I'm almost positive it's U3200 (its also the only thing getting warm on thermal camera) second opinions always helpful.
Thanks! -
Its not the only thing that gets "hot" but it's the hottest thing on the board as can be seen in attached thermal image.
U1200 is "System Power Management"....Leave a comment:
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A1990 820-01814A U1200 very hot when powered up, USB drawing > 4A
I have this machine. It powers up and gets fan spin, will even shut down when I hold the power button.
U1200 gets very hot under thermal camera, the next hottest region is UB000 and L7030. I'm assuming L7030 is warm due to charging.
Do I have a potential dead CPU? or just a dead U1200? Not sure what to check since everything is powered up. -
Thanks, I had to pass on doing anything further with this one....Leave a comment:
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