iphone 7P black screen

jack 03/22/2019

my phone suddenly goes black when I am playing a game. there comes these colorful lines and then the screen flickers and goes black. What could be the problem. I can not turn it on now.
Answers

REWA

03/29/2019

Try to replace a NAND flash with a new one. It is caused by CPU pseudo soldered or damaged if it still won't turn on when you change the NAND.
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