Asus Laptop New Fault - What is causing it ?
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Published 2022-09-22
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All Comments (21)
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At 12:11 it seemed like the IC next to the inductor had a small crack. Could also have been some dirt
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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 😊
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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.
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On 12:11 I think the surface of the IC is carcked.
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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 .
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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
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Nice video!! I always use my fume extractor when you are soldering just in case
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Oh! I can't wait to viewers ideas! I am not a smd soldering person. Just an amateur who likes to watch how Alex fix electronicks :-) So I am excited how far this repair will go.
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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
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Most of the time, first two mosfets are controlled by the charging IC. Try replacing the IC.
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This is the most interesting video you posted so far. Why? Because I have encountered this issue and never figured it out. Is there a part 2 to this?
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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.
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Alex, at 11:30 you can see the liquid metal has flowed down the GPU. Maybe it seeped under the kapton film and shorted the SMD capacitors. Please check it. Use isopropyl alcohol to wipe off the liquid metal residue from the kapton foil.
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Hi if there’s no voltage in the gate of 1st mosfet, check the acdrv signal from charging ic, if there’s no schematic available try to look the manually the data sheet of the charging ic and use continuity mode of tester from ACDRV signal if connected to the gate of mosfet. The ACDRV signal is generated of 22v or 24v from charing ic, NOTE: N-channel mosfet is always higher than the source in gate signal
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You could replace the charger IC at 4:33. It is dead and you could check it on REGN pin when plug in adapter. If it is alive, it will generate around 6V on it.
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Maybe you could check the Diode next to the 2 Mosfets you removed.
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Check 3.3v on the switch if not available verify if the 3.3v and 5.5v circuit is ok, the Start-up ic also needs checking.
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I would check the charge controller on the rear of the board, just left of the power connector. It controls the PWM signals to the MOSFETS. I couldn't read the numbers to look up the power, reset pins. Second, I would replace the low side MOSFET you removed. It shows signs of heat damage.
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I have learned a lot from your videos 😊 thanks alot .
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i realy love channel and your content! thanks and keep going on!!
