820-2850 vertical red lines when it uses intregrated GPU

MacBook Pro 15 820-2850 vertical red lines when it uses intregrated GPU, dedicated gpu works perfectly. What could be the cause? is more probably mux or failing intel gpu?
 

dukefawks

Administrator
Reflow the MUX, make sure to 1000% remove the bonding glue around and under the chip or you will be pulling and reballing it.
 
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