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Galaxy S8 - No cellular signal

I replaced the cracked display on my S8 and re-assembled it. Everything works great except that I can't get a cell signal. I just the “no” symbol (circle with a slash through it) where I should get the signal strength bars. I’ve tried adjusting the various cellular network settings without success, but even without that, I’m pretty sure it’s a hardware problem.


Any ideas on how to fix it?

Answer this question I have this problem too

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I also have this issue. The repair went as smoothly as a repair could yet, when I put the SIM card in I receive the no signal symbol, as well. This is the second one I've had do this but the first one was simply a bad connection. Has anyone ever determined if maybe a microsolder breaks on or near the connector on the motherboard that may just not be a visible issue?After all, it does take some pressure to connect those wires.

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Perhaps you may have forgotten to plug the antenna cables back in from the charging port to the logic board?

Also if some antenna contacts are broken on the logic board that connect to the plastic antennas that go over the logic board and are usually held down by screws that can be your issue too.

Refer to step 21 of this guide:

Samsung Galaxy S8 I/O Daughterboard Replacement

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I've checked and rechecked the antenna leads so it's not that.

Can you elaborate on the second point? Are you referring to the board held down by the screws in step 14 (above)? Because removing that was about as far as I got in the tear down. I didn't need to go further to replace the display.

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Yes, step 14 the black plastic cover shroud that covers the charging port and has the loudspeaker integrated on it has the antennas for 3G / 4G (Cellular Signal)

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Where are they exactly? There is a ribbon cable on the shorter segment but I thought that was for the speaker. I'm not trying to be obtuse but I want to ensure that I replace the correct part and not inadvertently break it again.

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I have provided an edited image of the antenna contact locations on the charging port dock assembly:

http://prntscr.com/kqec64

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Here is another one for the loudspeaker assembly which integrates the antenna with it:

http://prntscr.com/kqedlg

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defective charge port if the cables are fully connection try a new charge port also reconnect the antenna connections just in case

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Didn't work any better with new cables and a new charge port.

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I got a similar problem I swapped everything including the connection cable, speaker and the USB c port and I still can only get edge connection after a screen swap

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Did you mean you had to swap the screen to get a connection?

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Basically I swapped the motherboard from the broken screen to a new one only to notice I only get 2G edge connection now i cant get down to the issue already replaced daughter board the antenna cable an the speaker still only getting edge it wont find 3G or 4G networks n my wifi signal is weak too now

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I have tried all the solutions did not work for me

Then I took the phone apart and looked In side

on further investigation I found a loose flex cable on the mother board where the main antenna connects by the charging port on the left

This Straight away fixed my gps location problem.

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Do you have any more info what that cable was to or where it is? Do you have a picture?

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Gary Dale will be eternally grateful.
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