How to open Vivicine K6 projector and replace power board?

official web: vivicine.com
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● Real Native Resolution 1920*1080 pixels
● Built-in android 9.0 smart OS, 1G RAM,8GB ROM
● Rich interface with HD-In, USB , compatible with multiple devices,
● Built in HIFI 5Wx2 speakers,Shocking sound quality
● 4 Points Electric Keystone Correction by Remote control
● Max 200inch Large Image , much larger than 60inch TV
● High quality copper heat-sink system,Low noises level
● LED lamp life 50000Hours , If use 10hours per day , it can use 5,000days
● Digital Focus,Digital zoom by remote control