The power button does not turn the machine on. But when the adapter is plugged in, it will boot properly (without pusshing the power button). When in the OS, the power button responds. Can anyone shed some light on this or provide a schematic or boardview?
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Re: Asus Zenbook UX330UA odd power issue
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Re: Asus Zenbook UX330UA odd power issue
I don't see a cmos, and there are a few IC's that look like they can be the BIOS. Should I just hit pin 1 on anything that looks like a BIOS chip? Also, there is no CMOS on the IO boardComment
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Re: Asus Zenbook UX330UA odd power issue
On boards with no CMOS battery the board will power the RTC from the main laptop battery.What condition is your battery in,have you tried another batteryLast edited by SMDFlea; 05-24-2019, 03:52 PM.Comment
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Re: Asus Zenbook UX330UA odd power issue
Battery is fine. It holds a charge and charges properly when I boot into an OS. But the weird thing is that it boots automatically when the chrager is plugged in (similar to a MB Mobo externally with an 85w adapter), and once in the OS the power button functions. But if you leave the adapter out (with a fully charged battery) and try to turn it on with the power button, it does nothingComment
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Re: Asus Zenbook UX330UA odd power issue
A question on the battery ElJap0.. When you say it is fine, how have you determined this? Have you taken a multimeter and tested the voltage of the pack? If so, have you tried testing it under load?
There are many reason why a laptop battery can show that it has charged/is charged when it is still damaged. This could also point to a charge controller issue. If you are comfortable opening up the unit and taking the battery out, maybe stick a little 20-watt 12v bulb on across the leads of your multimeter with some crock clips and then probe the battery to see what the voltage reads. That would give a 1.7a test load and should give you an idea of what the batteries voltage is under load. (Something this maybe.)
It is always important to understand that batteries can read the correct voltage when they have no load, but dip down below operating voltage when under load. Since this is a Lithium battery it is going to have a mosfet/under voltage protection.Last edited by Retro-Hipster; 05-24-2019, 05:09 PM.
“Men always seem to think about their
past before they die, as though they were
frantically searching for proof that they
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Re: Asus Zenbook UX330UA odd power issue
Could you clarify how this would help to troubleshoot (no sarcasm intended). The power button not triggering the P.O.S.T. with a charged battery would lead me to think something is wrong with an S5 rail. That maybe the keyboard (or something else) is not being supplied power. Your input is appreciated, but could you clarify your thoughts on why a bad battery would be the culprit (again, no sarcasm intended)Comment
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Re: Asus Zenbook UX330UA odd power issue
Oh, no problem. This was me going off of what SMD flea was mentioning about laptops that do not have CMOS batteries. The idea behind this would be that the battery that is showing as fully charged main fact just be reaching its Target voltage quickly due to damage but then quickly dropping below its cutoff voltage. At that point the mosfets would not be providing any power to the laptop and you would not be getting any power. I guess the real take away from what I was saying was just that people often test batteries just by checking the voltage without a load only to find later that the battery cuts off immediately when a load is applied.
“Men always seem to think about their
past before they die, as though they were
frantically searching for proof that they
truly lived.”
– Jet (Cowboy Bebop) -Comment
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Re: Asus Zenbook UX330UA odd power issue
How do I test a laptop battery? And could the battery still be the culprit if the laptop stays on without the adapter, after being powered on by connecting it (without hitting the power button)?Last edited by ElJap0; 05-25-2019, 03:47 PM. Reason: wanted to adendum without creating another "reply"Comment
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Re: Asus Zenbook UX330UA odd power issue
Also, you're saying it might be a mosfet that is looking for a signal from the battery before letting the signal from the power button come through (or something of the sort (a "p" or "n" mosfet that relies on the battery signal))?Comment
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Re: Asus Zenbook UX330UA odd power issue
I'm having the same exact odd power symptoms. Was there any resolution to the issue? I checked and my battery seems ok - it is fully charged (12V) and maintains that voltage when plugged into the mother board. I'm checking to see if there is an updated BIOS to download.Comment
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Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
Hello everyone,
Mark and model: ASUS X571
Symptoms: not turning on. There is only the LED battery indicator working. The owner of the laptop told me this problem arrived one week after having changed the battery. He then managed to power on the laptop only once, and then it never powered on again.
Tests already made:
- Battery is charging when laptop is plugged in. The LED battery indicator turns white after a couple of hours of charge, indicating that battery is fully charged. However, laptop won't turn on anyway, with or without AC plug.
- I have removed... -
Hi everyone,
I'm having a serious issue with my ASUS Zephyrus GA401I (4 years old, worked perfectly until recently). The system is lagging heavily, even in the BIOS, and is charging extremely slowly (a few percent in hours), making it nearly unusable. I suspect a motherboard or power delivery issue.
Symptoms:- Severe lag across the system, including BIOS navigation.
- Slow boot times and unresponsive performance in Windows.
- Battery charges very slowly (e.g., ~5% in 2–3 hours).
- No error messages or BSODs, just extreme sluggishness.
What I've Tried:- Replaced
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Hello
The PC starts and shuts down correctly when the battery is removed. However, if I hot-plug the battery, it starts charging as if everything is normal. However, when I turn off the computer and then restart it, there is no display on the screen. The battery indicator blinks slowly, the fan runs, and the power consumption is approximately 520 mA, as if the computer is in standby mode. At this point, even if I disconnect the power supply, the computer doesn't start up normally anymore. Pressing the power button to force a shutdown works, but as soon as I release the button, the... -
This specification for the ASUS ZenBook UX330UA-0361A7200U Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the UX330UA-0361A7200U boardview and UX330UA-0361A7200U schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet,...09-06-2024, 11:30 AM
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