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X1 Yoga Gen 3 fingerprint reader dead

Discuss the ThinkPad-branded Yoga
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Joined: Mon Sep 03, 2018 7:44 am
Location: Concord, CA, USA

X1 Yoga Gen 3 fingerprint reader dead

#1 Post by pure3d2 » Sat Aug 07, 2021 9:59 pm

My X1 Yoga Gen 3 fingerprint reader doesn't work at all. BIOS says "not fingerprint device is attached." So I thought maybe the sensor board is dead. I buy a fully tested one from eBay and install it. It still doesn't work. So now I decide to test the cable. The cable has some broken traces; so I buy a new fully tested cable and it still doesn't work. I then test the pins on the connector that's on the motherboard side--6 out of 8 of the pins are shorted to ground.

I'm wondering if someone can give me some points on which ICs to test and replace.

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