Chromebook CP311-3H-K3WL won't charge with new charger, only works with specific 5V 5.7A charger?

So I am working on my grandson's chromebook which he says is broken. Upon receipt from him it would not power on, or seemingly charge. As a long time IT guy, I found a 5V 5.7a usb C charger in my collection, and upon using this charger the device charged and powered on. Ok great, charger must be bad. Ordered a new charger, specifically compatible with the CP311. It appears to be similar to the original, and the output listed is the same. 5v/3A 9V/3A 12V/3A 15V/3a and 20v/2.5A 45W charger. The new, compatible charger does not work. It would appear that the device is needing the 5V5.7A that my old motorola charger provides. As the label is obscured I can not tell what the actual power spec for the device is, so can anyone tell me? Has anyone had a similar experience, or have any thoughts on what is going on here?

[Edited the thread to add model name to the title]

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StevenGen

https://community.acer.com/en/discussion/717445/help-with-weird-charging-problem-cp311

You haven't told us the exact Chromebook model that you have, as the Chromebook 311-xx is just the first three digits but the adapters below are for the whole CP311-xx range, which should be compatible to your laptop and work 100%. Good luck.

These adapters are oem adapters that Acer has for all the Chromebook models CP311-3H/9H/11H laptops and they all are a 45W 5V/3A_9V/3A_12V/3A Type C 1450-50AD chargers, get the new GaN type USB-C chargers as for a 45W or a 60W GaN USB-C charger they are very cheap.

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Fractal815

Thank you for your response Steven. The correct model is CP311-3H-K3WL. I have looked at both the charger I received from my grandson with the device, KP04501023, and the one I purchased from Amazon, and both are specified for the CP311-3H-K3WL.

StevenGen

https://community.acer.com/en/discussion/comment/1313639#Comment_1313639

All the above adapters should work 100% if they don't and only your old 5V 5.7a USB-C charger works then the other adapters are faulty. Good luck.

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

billsey

Note that the specs on the chargers as listed provide different wattages for the different voltages. USB-C doesn't allow for higher than 3A output at any voltage, and 5V@3A is only 15W, or one third of the needed charge rate. With a 5V 15W charger you pretty much have to have the laptop turned off in order for it to charge, since it draws more than the charger puts out. Is there a chance the new chargers will work if twisted just a bit to put some side force on the connection? Sometimes the sockets get bent enough to not make good contact.

Fractal815

Hello Billsey, I have not been able to get the "correct" chargers to work at all. Interestingly just plugging in the 5v5.7a motorola charger I had lying around and it always starts charging. No wiggling or twisting. So that brings a question to mind. Do the various voltages of the "correct" chargers use different pins in the usb "C" plug? Perhaps the jack needs to be replaced or re-soldered.

billsey

Nope, the USB-C port uses the same pins for charging no matter the voltage. There is a handshake done when the charger is first connected, giving the modes available, then the current is allowed through those pins. I'm wondering if maybe your USB-C controller chip isn't handling that handshake right, which would mean the motherboard is bad, though I would expect in that case the charging would still happen, but at the default 5V. It's possible your old charger doesn't implement that handshake correctly, so the port decides to only allow charging at 5V…

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