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My iPhone x water damage overall work find front camera it work But i have problem with face id ‘A Problem was detected with TrueDepth camera. Face id has been disabled. The warranty expired. How do I fix it?

Are you certain the warranty expired? Perhaps Apple has different legal obligations in your country but here in Canada/USA, they offer a one year warranty. That said, if the device is water damaged, it will not be covered under warranty regardless. I have seen other iPhone X with water damage and the water seems to seep in by the earpiece speaker and or SIM card. That would definitely tend to attack the Front Cameras. But the issue may also be with the Illuminator/Sensor flex embedded in the display. The problem with the X is that the FaceID is matched to the logic board so it is impossible to replace components and make the FaceID work again. If TrueDepth is the only thing missing, it may be something you’ll have to live with unless you want to spend a lot of money on an out-of-warranty replacement.

you just done for okay i looked and looked no way u can fix it without bringing it to the apple store

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. Why Face ID Not Working After Repair So my suggestion is that you take apart the phone and check Face ID parts and the motherboard carefully. Face ID problems are usually complicated and solutions flexible. Good luck! How To Fix iPhone 11 Pro Max Face ID Not Available - Motherboard Repair