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Released 2021, October 05 204g, 8.8mm thickness Android 11, up to Android 13, MIUI 14 128GB/256GB storage, no card slot

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wifi and bluethooth problem

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my phone got submerged in seawater, and when i had the time to quickly disassembled it, there's a residue of the sewater, and tried to remove the residue of salt to prevent corrosion, after a few days, i managed to but thermal paste, kapton and copper tape and and b-7000, i used an electronic grade 99% isoprophyl alcohol to submerge the motherboard and clean the top part since it has the makrs of saltwater residue and brushed it gently, and clean the middle frame (top part) where a few residue of seawater can be seen, after reassembling the phone, i managed to power up the phone, all works, aside from the bluetooth and wi-fi connection, at the wifi, only a few times, it can detect the wifi but only at 1 signal and 2.4ghz only, it cannot detect the 5ghz and im not event 5meters away from the router,then disaapear right away, i assume the issue/problem has to do with the hardware, which part should i pay special attention to trigger the signal receiver or which part should i replace, is it the plastic back cover?, the middle frame ?

EDIT* i've added the close up image of the said antennas

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Well checkout the following video it might help you in fixing the issue: https://www.youtube.com/watch?v=5FAKw097...

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Ah, I saw this the video a while ago and it was one of my options to do but I'll need to search for a professional to do it and because I lacked the budget for it, my phone will sit still for the time being, thanks very much for the advice

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Hi @shysamurai

Try using the phone <15cm from your network router and check if the WiFi detects, connects and maintains a stable connection.

If it does then most likely it is a faulty antenna or antenna connection (either end, main systemboard, sub board and speaker assembly). Maybe also check the antenna connections on the boards again for any corrosion i.e. disconnect the antennas and check

Here's a composite image taken from this video showing the cables and where they're connected.

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(click on image)

If everything looks OK it could then be a faulty antenna module. Search online for 5600020K3S00 to find suppliers that suit you best.

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i tested and was able to connect to the wifi and maintain a connection, but my phone and the router needs to stick together first, it's like having the router basically glued to my phone lol, oh and thanks your insight, it was helpful

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@shysamurai

Did you disconnect the antennas and check the coax connectors?

Also did you inspect the white antenna cable connection as I think that you have to lift the module to see it

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@jayeff yes i did, but should I disconnect the coaxial cables while the phone is on or i must turn it off first, i don't know if its safe to do that, let me know if i'm doing it wrong, also i uploaded a picture of the motherbaord and marked the part (which is the top part) that had a residue of dried seawater when I disassembled it first, that's the part the I cleaned using 99% alcohol, I don't have most of the right materials and don't have the budget to get it to a professional to fix it

after much thought, i was thinking if the cables are the problem or the antenna module, because afaik it wasn't touch by the seawater when it got inside the phone

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@shysamurai

You should never work on a phone when it is on or when the battery is connected.

There's always power on the boards somewhere even if the phone it turned off. The Power button is not a power isolating switch.

Just because there's no corrosion evident near a component doesn't mean that it hasn't been affected by liquid entering the phone more so if the phone was turned on at the time.

Liquids can cause unwanted circuit paths to be created which can damage components even if it isn't evident to the eye.

You've isolated it to the antennas or the antenna module as it works OK when very near to the the signal source.

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@jayeff yes i did not try to disconnect anything connected when it is powered on, or try to directly disconnect the battery when it is powered on, i always turn it off the phone via the power button,

"You've isolated it to the antennas or the antenna module as it works OK when very near to the the signal source.

" but the signal is very poor after the 2nd, 3rd, 4th tries to reconnect it,

it looks like i'll have to let this phone of myself sit for a while(it may take a few months or years, guess i'll have to save up for a new phone), i'll have to back up everything I can and let a professional see it if it can still be fix/restored, still thank you very much for a lot help and advices

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ShySamurai will be eternally grateful.
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