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Did you buy the parts from Banggood.com? I just bought the parts that the website with the info took me to and that was Banggood.
All together it cost about $15 and that included free shipping.
It all just worked for me, sorry to hear about some folks having so much trouble with it.
The only thing I modded on it was I increased all the leads to about 1 metre long so I could mount the LCD above the printer but that was it. I kinda got fooled when I powered it up and the screen was blank, but I soon figured out that it was just the contrast that needed adjusting on the LCD board.
My advice to anyone would be buy the Banggood parts that the guy suggests.