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What is soldered on the motherboard next to WIFI?

I followed a guide from here, what doesn't say anything about this, so this happened:

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Is it a WIFI antenna/booster? Where can I get a new one if that's possible?

Is it important for the perfect working order, can I use something else for (wire etc.)? I asked straight from Lenovo, they don't let me know. I also asked the Lenovo forum with no any luck. Thanks for any help guys.

I couldn't test it yet, I'm waiting for a new battery.

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It is strange and interest as well...the tablet just works fine without that part.

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Can you check where the cable comes from/goes to ?

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The 'tape' was soldered to the motherboard in one point, so there is no voltage if I'm right. The other thing, it is very close to the WIFI connection (the full back cover is antenna) so it looks like a booster or just a 'security tape' to see if somebody open the tablet. I dunno either way, but it works well for now.

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