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...
abajor
Senior Member
Last Activity: 06-01-2025, 06:11 AM
Joined: 02-08-2024
Location: Santa Rosa, CA
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mon2[USER="295753"]mon2[/USER]
I just picked...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
[B]PP3v3_G3H_RTC ~3.9V with rear USBC, cycles 0-5.1 on forward USBC.[/B]
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!Just looking for a second opinions before I try to source a CD3217
Rear USBC -
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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Anybody here have any suggestions on what to check for PP3v3_G3H_RTC_X diode drop issue? I've tried to dig through the schematic there are many devices on this rail I don't want to blindly start removing components until I find what is messing up the diode drop. Reverse voltage injection isn't helpful as I described in my initial post.Leave a comment:
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Just for an update I sent it to a place with an ultrasonic cleaner and the machine works.Leave a comment:
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Asus G634j Rog Strix SCAR Power rail shorted nothing hot on thermal camera.
I haven't been able to find a schematic or board view for one of these out in the wild. I had one come in with a no charge/no boot issue.
It Uses two pairs of Source to Source Mosfets after the power jack to prevent back flow from battery or PSU after the power jack.
The drain on the board feed side of the Mosfets measures a near dead short to ground. I attempted a voltage injection there it draws about 1.4A at 1V absolutely nothing heats up on the thermal camera.
It draws 1.86A injecting directly to ground.
Is this just the way it is when these ultra... -
So learning the hard way I removed all of the VRAM chips, not sure if they use some special formulation of solder for the BGA but they were very difficult to desolder, ripped a few pads I need to now fix with micron wire.
The really odd thing is after removing all six of the VRAM chips I found that the circuit still has a resistance of around 56ohm. Very odd for a power rail with no load devices and no buck converter mosfets installed.
I didn't realize I needed 6 VRAM for this board so I'll have to wait to go any further with it. Wondering about this 56ohm resistance I'm measuring...Leave a comment:
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A2141 PP3v3_G3H_RTC_X Diode Reading .104V Voltage 3.39V
Have an A2141 which is reading about 5.2V 0.07A on all USB jacks, started doing the measurements.
PPBUS_3GH diode: measures good .45V
PPBUS_3GH Voltage: maybe not so good 12.25V maybe bad T2? Unit did not come up in DFU on configurator.
The weird so far is
PP3v3_G3H_RTC_X diode: .104V (WTF?)
PP3v3_G3H_RTC_X voltage: 3.39V (Normal)
Stopped there attempted reverse voltage injection at PP3v3_G3H_RTC_X with 1V. Instead of the circuit sinking any current, My PSU suddenly reads 3.4V with no current draw.
Not sure what any of this means... -
Unfortunately no.
Wasn't able to identify where the other issue was coming from....Leave a comment:
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I'm about to order some mosfets for the VRAM power stage, I'm wondering what a typical DCR of the VRAM "+FBVDDQ" voltage rail should be to ground? I do have concerns that the VRAM is damaged since the buck converter mostfet was shorted, and the thermally varying DCR is coming from the VRAM itself....Leave a comment:
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