Re: Asus UX330UA won't power on
Does this seem like it's an issue with one of the ICs? If so, that's probably beyond my ability to fix. I would probably just have to replace the board in that case (or if we can't track down what the cause is).
If it's something like a cap/mosfet/res then I can probably handle it (depending on the size of the component)
z0civic
Member
Last Activity: 08-10-2022, 08:53 AM
Joined: 08-06-2022
Location: Colorado
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Re: Asus UX330UA won't power on
Oooooh, I understand now. Thank you for explaining
I'm learning a lot....
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Re: Asus UX330UA won't power on
So you think the IC @ U5206 is what is causing the problem? (Since the fuse was never there?)...Leave a comment:
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Re: Asus UX330UA won't power on
The component was never present....Leave a comment:
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Re: Asus UX330UA won't power on
So I did some more probing with power connected. Before and after hitting the power button, this MOSFET had 19.5V on the supply side, and 0V on the gate and drain side.
Not sure if that really tells us anything we need to know or not?
The MOSFET next to it was always 0V on everything...Leave a comment:
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Re: Asus UX330UA won't power on
But those rails should have at least some voltage on them after hitting the power button, correct? Does that mean the problem is before them but after the main power rail?...Leave a comment:
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Re: Asus UX330UA won't power on
Forgive me, but is that different than what I posted in this picture? (The three coils with <15 Ohm resistance)...Last edited by z0civic; 08-07-2022, 07:44 PM.Leave a comment:
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Re: Asus UX330UA won't power on
Also, out of curiosity, after disconnected the power I put my multimeter in Diode/Resistance to ground mode (where it beeps at a closed circuit) and tested those coils that were at 0V
These three all sounded and read <20 Ohms on the meter
Interestingly, that fourth one further down to the right did not....Leave a comment:
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Re: Asus UX330UA won't power on
Hopefully I correctly identified the coils? I did the resistance for both sides of the coil just in case (as indicated by XX/YY) if the numbers differed.
Hitting the power button seemed to make no difference on the voltage for any of the coils. They all either had power or not when the AC adapter was plugged in. (I even had the probe on the coil as I pressed the power button just to see)...Leave a comment:
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Re: Asus UX330UA won't power on
Hopefully I understood correctly.
Picture attached - all resistance readings from 0V leg of green part to casings, ground, etc. were all "open line"...Leave a comment:
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Re: Asus UX330UA won't power on
Also, I did a bit more reading and watched some videos.
Am I understanding from the board schematic correctly that the green component is a fuse? I checked to see if there was flow through it (without power) and got nothing.
I then added power and checked the voltage on either side as indicated by the attached picture.
Does this mean the fuse is bad? (If it even is a fuse - it's on the other side of the board so I can't tell)...Leave a comment:
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Re: Asus UX330UA won't power on
Thank you very much for your quick and clear reply! I really appreciate it!
Here are the measurements:
Resistances:
Source (1-2-3) & drain (5-6-7-8): 2.7 MOhm
Source (1-2-3) & gate (4): 3.15 MOhm
Gate (4) & drain (5-6-7-8): 0.928 MOhm
Source (1-2-3) & drain (5-6-7-8): 2.64 MOhm
Source (1-2-3) & gate (4): 3.12 MOhm
Gate (4) & drain (5-6-7-8): 0.6 MOhm -> 1.000+ MOhm (kept climbing)
Voltages:
Source (1-2-3) & ground: 19.5V...Leave a comment:
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Asus UX330UA won't power on
[b]Machine:[/b] Asus ZenBook UX330UA-AH54 13.3"
[b]Specifications:[/b]
[b]-CPU:[/b] Intel Core i5 7200U
[b]-GPU:[/b] Intel HD Graphics 620
[b]-RAM:[/b] 8 GB DDR3
[b]-Storage:[/b] Samsung 860 EVO M.2 SATA (500GB)
[b]Motherboard Model Number:[/b] 60NB0CW0-MB5020
[b]Background:[/b]
I bought this laptop for my wife in 2016. The original M.2 drive failed and so we got my wife a new laptop (figured it was time for an upgrade anyway). I wanted to keep the ZenBook as it's a really great little portable thing that weighs nothing and is great... -
Re: New Members - please post your introductions here
Hello! I'm new to laptop repair but not new to tinkering with computers. I went to school for computer science and worked at the university's IT shop for several years.
I've fiddled around with some electronics work (build my very own lightsaber!) and would consider myself okay at soldering, but certainly not good.
My main reason for coming here is I'm sick and tired of a world where we have planned obsolescence by companies trying to generate more profit at the expensive of...well, everything and everyone...Leave a comment:
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