Xiaomi posted an official teardown video of the Xiaomi Mi 9T (aka Redmi K20) showing what makes it tick. The pop-up selfie camera is driven up and down by a stepper motor, a design that should be familiar enough by now.
The rear camera has two modules – the 48MP main cam and the telephoto cam come as a unit, the ultra wide-angle camera is on a separate module. The complicated-looking motherboard wraps around all that. It houses the Snapdragon 730 chipset and memory, plus the heat spreader.
The loudspeaker is on the bottom – it features a large 0.9cc cavity for better sound. Towards the end of the video you can see the in-display fingerprint reader too, which kind of looks like another camera.
Here's another look at the positioning of the three rear cameras:
I like the fact that the sim card trays were not hardwired to the motherboard, easy replacement if broken.
Jerry Rig can better than this................................................
Well that's a crappy teardown. Jerry come in please.