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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)
[image|2468217]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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[image|2468217]
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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)
[image|2468218]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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[image|2468218]
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[image|2468217]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)
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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[image|2468218]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)
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)