Surface pro 4 screen only works for a few seconds

so i bought a used faulty Surface pro 4 to repair, i identified the usual blown 0 ohm resistor and replaced it,

the surface now boots but the LCD screen only shows the “surface” logo then the lock screen then the screen goes black, and it only does this sometimes, its usually black, but backlit

i also have a monitor hooked up to the surface and that works fine via the mini display port, its a locked account thats on the surface and i dont know the password and the seller is not the original owner, anyway, the miniport output does not show the bios when i boot into it and as the lcd is not working im at a loss..cant format ( restore ) it.

i got the screen off intact and when it works for 2 seconds it looks ok, the i get coloured bars and it goes off.. i have ordered another ribbon cable in case its faulty, but it looks ok. any thoughts appreciated

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