Why does my Huawei P10 not charge with more power than it consumes?

[Android Central Question]

Device: Huawei P10 (VTR-l09)

Symptoms:

When plugged in, the phone recognizes the charger but the battery state of charge does not increase but rather decreases. The charger and cable are fine (about 1A of charging current measured with other device) and the phones power consumption is not unusually high (no streaming, no games, the phone does not really get hot). When turned off the phone does not even recognize the charger.

The problem occured after i replaced the display with the help of an iFixit tutotial (no offence). After i had checked the corrected installation multiple times and it still did not work I reinstalled the old original display and replaced the old battery with a new one. Didn´t help. I also replaced the charging board. Sadly the problem did not disappear. A factory reset also did not help.
What could be the cause of the Problem?

I appreciate any of your thoughts on this, thanks a lot in advance!

 

[VidJunky]

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If you are sure the issue did not begin until the screen repair that would point to the issue obviously being caused by the disassembly and assembly of the device. I say obvious because I didn't want to be labeled captain Obvious. Anyway, I've seen issues with devices, not the Huawei brand specifically, where it was recommended that the charging port be changed with the screen. I don't know why it works or how it makes a difference but it did. You say you've changed the port however and the battery now. So let me ask what combinations did you try?

New screen-old port-old battery = obviously

new screen-new port-old battery?

old screen-new port-new battery?

new-new-new?

new-old-new?

You also say the charging port is on a board, does this board have contacts that rest on another board to complete the connection or is there a cable that connects to it? If it is contacts, during any of the disassembly work did you check the contacts or clean them to ensure good contact?

This is a USB-C device and while USB-C does not go bad as often or in the same ways that micro USB did these cables still have issues. I have one right now that if I plug it in so that you can see the brand name it barely or won't charge my device if you flip it over it charges just fine. I haven't looked into it because it works and frankly IDC that much.

In the meantime have you tried other cables?

Have you tried flipping the plug over?

Have you examined the plug and the port to see if anything is inside of either? That is one thing about both the port and the plug for USB-C they both have openings big enough for something to get stuck in them and you might not even notice.

While the brick rarely goes bad they do fail, have you tried another charging brick?

Moving away form hardware for a moment, have you checked your processor use? I know you mentioned factory resetting the device, which if you didn't automatically reinstall all of your apps may have meant something, because often if it is a bad app when auto reinstall is used the bad app just gets reinstalled along with the problem. I also realize it's easier.

If you aren't finding an app or two with high processor/ram use then the issue is likely hardware but the easy way to test if it is an app is to run the device in Safe Mode. Safe Mode will prevent apps from running in the background and can point to hardware or system software depending on the results.

Fill in a few answers and we'll go from there...