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Re: Dead ASUS ROG G14 (GA401)
I appreciate your honesty and good to know, you sorted the question about the charging IC already. It is just, I'm pretty afraid of we're missing something important although we already stare at it.
You have replaced the charging controller a second time, correct?Last edited by Sephir0th; 03-09-2023, 12:23 PM.Comment
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Re: Dead ASUS ROG G14 (GA401)
I don't know. A few pics of alle the jobs you have done on this board so far would be nice.Comment
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Re: Dead ASUS ROG G14 (GA401)
Alright,
First I found a couple shorted caps around the BIOS chip (2 Ohm), removed it, but the short was still present. I resoldered it and injected 1V1A at one of the shorted caps, and saw the EC IC get hot. Removed the EC and found the short was gone. Ordered a new EC IC and soldered it, short was still gone.
Installed the board again, but still no sign of life.
I then replaced the BQ IC, still no life. I replaced the second DC-In mosfet, still no life.
That is pretty much what I have done.Attached FilesLast edited by jacobtc; 03-10-2023, 09:58 AM.Comment
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Re: Dead ASUS ROG G14 (GA401)
My suggestion would be to check both mosfets again a) for internal short and b) for unexpected short to GND at either Source, Drain or Gate. Without power of course.
Then a updated voltage measurement of the charging controller would be nice, Pin 4, 5, 6, 24, 28. Then remove power and switch to beep mode. Check any of the 28 pins for unexpected short to GND.
Then report back hereComment
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Re: Dead ASUS ROG G14 (GA401)
Found this mosfet (source) shorting to ground now, pretty sure it didn't before though
Should I remove and measure it?
It sits under the GPU.
EDIT: Removed mosfet, short is still present on Source pad.Attached FilesLast edited by jacobtc; 03-11-2023, 12:25 PM.Comment
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Re: Dead ASUS ROG G14 (GA401)
Injected 1V2A on the Source pad, nothing got hot on the thermal image.Comment
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Re: Dead ASUS ROG G14 (GA401)
Please Stop immediately with this headless troubleshooting.
You're injecting into the low-side mosfet of GPU_Core, where one side is indeed GND and the load side "appears" as GND, because it is the GPU_CORE rail, so very low Ohms reading expected. This is absolutely normal and you're trying to kill the GPU right now.
So please just stop with what you're doing. You're on the best way to destroy the board. I didn't had time to check your measurements. I'll do it later, asap.Last edited by Sephir0th; 03-11-2023, 12:51 PM.Comment
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Re: Dead ASUS ROG G14 (GA401)
Everything looks normal, except ACDRV not coming up. Since this component connects to ACDRV line i strongly suspect it to be the culprit here.
Are you able to trace where else it connects to?Attached FilesLast edited by Sephir0th; 03-11-2023, 01:22 PM.Comment
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Re: Dead ASUS ROG G14 (GA401)
Look, what i've found in the schematics of a ASUS GX531GS. Same charging IC and this extended ACDRV circuit. Maybe i'm wrong, but if this is a faulty diode, you should get ACDRV back as soon as you have removed it.
Check, try and report please.Attached FilesLast edited by Sephir0th; 03-11-2023, 01:43 PM.Comment
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Re: Dead ASUS ROG G14 (GA401)
This is the one, should I remote it and connect power?
It's a transistor.
I also uploaded a screenshot of the ACDRV path...Attached FilesLast edited by jacobtc; 03-11-2023, 03:23 PM.Comment
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Re: Dead ASUS ROG G14 (GA401)
Alright, ACDRV is now 1.2V!
DC-in mosfets are still low, 1.2V output from the first and 4V from the second.Comment
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Re: Dead ASUS ROG G14 (GA401)
This is so weird. Check the Mosfets again for internal short, for sanity
And then place the component back and check voltage at all three pins pls.Comment
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Hello i need help to fix this laptop,at least a discrete to UMA conversion if it's possible.
i took a photo of what i found,NVIDIA gpu side is 100% shorted as i desoldered power line coils and mosfet side is ok.
Even without coils laptop still not power on.Main power rails,bios,1v,3,3v and 5v are present... -
Hello.
Have this Asus UX433FAC that came with shorted mosfet on main power rail. After replace laptop works ok, but battery is dead. Laptop show charging but voltage on battery is 0.2V. when remove battery voltage on battery connector goes to 8.5V, but when connect battery again it goes down to 0.2V.
can that short shorted battery? batmon show that battery is full at 80% -
(If anyone has a functional boardview file of FX505DV/DU that would be helpful)
(Had 3 problems, now just 1)
I have no experience or knowledge and usage of tools to repair devices besides the entire past 12-10 days of researching, watching YouTube repair videos and troubleshooting this laptop motherboard. ChatGPT was used as a guide to ask questions.
I used boardviews of mostly FX505GD-M, and some FX505DU, FX505DD. Used schematics of FX505DU.
I had originally intended to replace the BQ24780s first (due to previous battery removal while benchmarking) but I... -
I'm trying to see if someone could help me with my Asus Zenbook 13 UX 333F with given symptoms that I've experience during a recent external short.
During last laptop charge, as I was moving the DC power supply, I caused the two leads (+ -) to touch. After that event the laptop stopped charging and pulling amps form the power supply. The only way the laptop will come on is with the power supply connected and the battery having some charge to it, battery drains immediately after short operation (it gets to Windows log in screen before it shuts off). The laptop would power on, show... -
Hi guys!
I searched for the term "dead short" in the forum but no specific thread came up however if I'm just blind and couldn't see the thread talking about this please forward me to that direction.
So my problem is I don't know how to find the source of a dead shorted voltage rail. Dead short = ~0 ohm resistance.
I have two VGAs (HD 4850 and HD 4870), both dead shorted to ground on the memory rail. I have the boardview file for the 4870 and the memory rail consists around ~7892346 capacitors...
I have a bench PSU and if I try to inject voltage the voltage...
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