Macbook Pro Retina 2012 Screen Flickering


my screen flickering in predictable cycle. during flicker, there horizontal , vertical grey lines , display seems freeze. however, computer not freeze during time... if keep typing see when flickering dissipates.

tried replacing lvds connector , cable.

has seen or have ideas causing or how fix it?

here video of what's going on.

https://www.youtube.com/watch?v=kbcx08vn...

please let me know if guys have seen before , think is. thanks.


update: oct 17, 2017

there key things issue. firstly, tried turn off automatic graphics switching , did nothing.

i able video on hdmi , perfect no issues @ all. however, screen keep flickering during time.

after being on while... either using through hdmi or trying use flickering lcd screen seems go normal , long leave computer on stays normal!

it's if it's "warming" or something.

i've noticed tingling on casing when have laptop plugged... i may have short... investigate.

1 - right i'm wondering if there short somewhere cold causing this
don't think it.... after researching tingling seems more related fact moved europe , dump excess of 240v case.

2 - know if smc related issue didn't have working battery when presented (now there new battery in) , heard smc draws off main battery instead of having regular coin style battery.
 

have turned off automatic graphics see if helps? looks graphics card
 


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