I had the issue that my audio jack didn't work and so I replaced the part, by doing that I noticed the real issue: a little cable broke (not during my repairs).
It's the little plug connecting the charging and audiojack with the main board.
(https://youtu.be/oWLBeKcft5g?t=165 In this timestamp he removes it, the little one left to the big black strip)
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That would be a coaxial cable for the cellular antenna to feed the signal to the motherboard. In one repair guide I found it's called an interconnect cable, but hard to say if that's an artifact of the translation from French or not.
At any rate, here's a guide that shows how to replace that particular part.
Interconnection cable Huawei P20 Lite repair - Free guide - SOSav
As mentioned in that guide, that cable is typically replaced for these reasons.
- Torn cable
- Loss of 3G / 4G network
- Bad network reception
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