Common fault Xiaomi UST Projector 4k and Fengmi 4k , vertical lines solution We are from singapore, We are doing projector repairs since 2009 , It so nice to see people sharing knowledge on repair here , After reading your wemax 4k vertical lines solution , we manage to make the stainless steel plate with few try , the diamension is critical and flatness is critical , installing it needs to very very careful not to damage the dnd chip , We try over 5 times with the laser Cnc machines, finally after the 5th finished stainless steel plate, We manage to be suscessfull and we hv installed the stainless steel plate , and been using the Wexma 4k for the pass 9 months daily , and some of my customers using it also for 6-9 months after installed the stainless plate . And 1 musem use it daily 8 hours daily about 5 months ago , till now , no complains . Wonderful All happy and finally we resolve this flaws that Xiaomi made . Thanks for you . We make over a hundred pcs due to Cnc machine to make 1 is very expensive Thanks a million Thank Jazz cheong Singapore Projector Doctor PTE ltd -- Jazz Cheong hp +65 94559492 Email : jazz@projectordoctor.sg Projector Doctor Pte Ltd www.projectordoctor.sg Facebook : Projector Doctor Pte ltd