A1708 820-00875 Powers on but bank screen

[Aboynamednasar]

Hey guys. New here
So I fix MacBooks as a hobby and this is probably my 30th one and I’m stumped

A1708 MacBook 13 inch powers on. You can verify by the caps lock which is green.
Plug her on charge and you hear a charge sound, but that’s where the good ends by

• the screen stays blank. No low brightness issues (I’ve shined a light and nothing shows on screen)
• Opening up the unit which shows signs of corrosion but nothing detrimental

not sure where to go from here

maybe some of the pros can assist?

 

[Aboynamednasar]

 

[2informaticos]

First of all, welcome to the forum!

Do you get external video?
Test disconnecting internal LCD.
Also check for USB activity.

 

[Aboynamednasar]

Ok so testing this morning - external screen seems to be working fine (GREAT) - flashing folder with question mark has appeared (not too worried about that)

but the question is, what could be causing the internal screen to not emit any video ?

 

[2informaticos]

Do you get 3V3/5V_S0SW_LCD?
DP_INT_HPD goes high?

 

[Aboynamednasar]

ok so ofcourse we found the problem - the tcon board connector for the lcd is burnt from Flexgate issues - sigh - we gotta replace the female connector on the tcon and replace the backlight cable