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Face ID parts are complicated and difficult to repair. To fully understand Face ID, you can check below. 修理後にFace IDが動作しない理由 And for a detailed repair process, you need to pinpoint the faulty component first. Whether the flex cable has been ripped-off or relevant component has missing. Hope the following repair guide can help you somehow. Face ID Not Available because of a missing component on the motherboard: iPhone 11 Pro MaxのFace IDが利用できない場合の対処法 - マザーボードリペア

Judging by what we have learned during the teardown of Face ID, main circuits of the Face ID are exposed. Once water damaged or exposed to a relatively humid environment, there might be electricity leakage or short-circuit problem that can result in Face ID failure. 修理後にFace IDが動作しない理由

(1) There are 8 components packed into the front of the phone. Infrared Camera; Flood Illuminator; Proximity Sensor; Ambient Light Sensor; Speaker; Microphone; Front Camera; Dot Projector; (2) The infrared camera, the dot projector and the front camera are located on the back glass assembly. The flood illuminator, the proximity sensor, the ambient light sensor, the speaker and the microphone are located on the display assembly. Please be careful when disassembling or repairing the phone. Damage of any of these components might cause Face ID failure. (3) The three parts ( infrared camera, flood illuminator and dot projector) are paired to the phone. To keep Face ID working, the three parts should always be the genuine parts. (4) Please be noted that there is a slot on the display assembly. When assembling the phone, the fold of the speaker flex cable should be placed correspondingly in the slot to prevent the cable from getting broken. Which will also result in the failure of Face ID. (5) 修理後にFace IDが動作しない理由

Check the dot projector iPhone XのFace IDが使えない時のトラブルシューティング「iPhoneを少し下/上に動かす

Sounds like something is wrong with the dot projector. iPhone XのFace IDが使えない時のトラブルシューティング「iPhoneを少し下/上に動かす

Face ID parts are complicated and difficult to repair. To fully understand Face ID, you can check below. 修理後にFace IDが動作しない理由 Face ID Not Working After Screen Replacement - also flex cable broken: ディスプレイ交換後にiPhoneXのFaceIDが機能しない問題を修正する方法

Face ID parts are complicated and difficult to repair. To fully understand Face ID, you can check below. 修理後にFace IDが動作しない理由 And for a detailed repair process, you need to pinpoint the faulty component first. Whether the flex cable has been ripped-off or relevant component has missing. Hope the following repair guide can help you somehow. (1) Face ID not working caused by a broken infrared camera module flex cable: How to Fix iPhone X Face ID Not Available (2) Face ID Not Available because of a missing component: iPhone 11 Pro MaxのFace IDが利用できない場合の対処法 - マザーボードリペア (3) Face ID Not Working After Screen Replacement - also flex cable broken: ディスプレイ交換後にiPhoneXのFaceIDが機能しない問題を修正する方法

Face ID is much more complicated than you think. 修理後にFace IDが動作しない理由

Maybe the repair guide below can give you a hint. How to Fix iPhone 7 Hey Siri Not Working

Actually you can transplant these sensors onto a new flex cable. As described in the repair guide. ‘Prepare a new flex cable. Apply some Paste Flux to the bonding pad and solder the detached Flood illuminator module. ‘ ディスプレイ交換後にiPhoneXのFaceIDが機能しない問題を修正する方法