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Repair and disassembly information for Samsung's flagship S20+ Android smartphone, released in March of 2020.

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No network after screen replacement

Replaced the screen/frame on an AT&T S20 Plus, transferred over all parts including front camera, charging daughterboard, 5G antennas, etc. After sealing it back up, it’s not detecting the cellular network. Fearing a bad part, I put it back in the original screen/frame and same thing. All connectors look fine, pressure pins on the charging port are in good condition, too. Anyone have any ideas? Thanks in advance!

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I have the same problem with my s20plus after replacing the screen no network signal. And I do not see any network cable on the main board or on the screen to transfer how to resolve it please???

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Why this issue happened

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I know on a S21 Ultra, I did a screen assembly swap and the part was identical but once I powered it up I had the same issue. Not a single answer made sense. Finally someone mentioned replacing the screen assembly fixed there’s. I dug deep into the screen assembly and learned there is a small antenna flex on the corner and it’s held down by tri-wing screws. It turns out they aren’t universal. The “international” assembly uses a different band antenna. So I swapped my original flex and instantly had a signal again but this time it actually worked on the AT&T network. What an ordeal! Maybe the S20 is similar? As it turned out, the SM-G998U uses a different version of this LTE/4G antenna than the screen used on the “B” variant (SM-G998B)

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We found the same thing and it seems swapping the flex works sometimes. It'd be easier if suppliers were a little more open about their "U" model service packs actually being "F" models.

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Yep same thing! Took me hours to narrow it down

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Can you tell me where this Flex antenna is located? I just swapped all the internals of my Canadian s20 plus to a replacement screen frame and I'm having the same issue. Thank you

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Looking into the old frame, should be upper right side, runs against the inside. There are about 4-5 torx screws and some adhesive holding the connector down. The new frame may will have a very similar part except it will have a slightly different “type” printed on the connector. Like NA or int. It may not even have one. Just carefully transfer the one from old frame to new one.

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I think I know where you're talking about. I think that's where the 5g antenna is. My Canadian s20plus doesnt have that antenna on the mid frame. It's just a empty slot on the old frame

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It’s not the 5g slot with 2-Philips screws… it’s pushed up into the frame. I used to have a picture. “Flex” it’s a ribbon with 4-5 attached hold down screw slots it’s L shaped to fit in upper top and right side.

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Be careful of the replacement screen assembly. Example: if you have a US Model on Verizon, the replacement will not be compatible if it’s an “international” model. And vice versa. The LTE/4G antenna boards are also different bands.

SM-G985F Would be incompatible with SM-G985U similar with 986’s. This may sound confusing and frustrating.

I hope this bit of feedback helps you.

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First of all I need to check your network flex it can be issue or something if u you not getting network or issue because some thing with screen damage it can be damage so I need to check it

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