Asus Laptop New Fault - What is causing it ?
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- Опубліковано 21 вер 2022
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Puting a wire instead of the two MOSFETs will not fix the problem because AC_OK will not be present. So to solve the problem just replace the two MOSFETs . All Asus laptops have this problem
Bro, why are you exposing the board to a lot of heat, My phone is getting hotter
Hi Alex, I am a electronic hobbyist, often watch your videos, with your knowledge and skills I learnt a lot and today I fixed a hard drive one of teachers and very glad that it worked out well. Just thanking you will be less to appreciate your sharing skills, knowledge and talent. I am glad that I bumped on to your videos and yes I used lots of flux 😊
Most of the time, first two mosfets are controlled by the charging IC. Try replacing the IC.
This is one of those cases where the short existed, BUT...as it can no longer be seen on the thermal camera, the short was so large that it already blew/opened/destroyed the component internally. This is one of the toughest faults to detect, as you would have to make sure the components are getting the correct voltage. I would pass on this one, not worth the time to diagnose, even with the schematics.
What about a dead bios battery? Sometimes the tiny little battery that maintains bios settings and the RTC (realtime clock) module being dead would prevent the laptop from turning on, I actually experienced this a few times in the past.
So..where is the solved video?
Alex, whats the model number of the laptop?
What is the name of this motherboard?
It could be the Super I/O
At
I started at 20yr old to to have an AS Degree in electronics and not I'm 74 and still learning to ID the SMD components by watching you name them as you test them. I still have a steady hand to do the micro solder with your help of showing the componants and how you test them. Thank you.
The charging chip is the likely culprit... even if you jump the two MOSFETs, the charging chip needs to send an AC_OK signal to the Embedded Controller indicating that a charger has been connected to the laptop. That prompts the EC to instruct the 5v and 3v chip to start working
On
I think we need to check the capacitors of the smps lines ( for leakage ) or the lines that control the gate of the mosfets ( for level of voltage ) or completely change the charging ic and see .
You could replace the charger IC at
Alex, at
I would check the charge controller on the rear of the board, just left of the power connector.
Oh! I can't wait to viewers ideas!
The only thing I can think of that will be stopping the proper flow of electricity to the main board will be a shorted capacitor somewhere. Usually when microcapacitors short out they can either act like resistors or just no powerflow at all.