Strange issue with Macbook Pro 15" mid 2015

[roxboy1984]

Please could someone assist. Im having a very strange issue. So i have a Macbook pro that was having screen issues where the screen would glitch and show artifacts etc so i initially thought the screen needed to be replaced so i got a replacement and installed the new screen which was just completely black. i can get a display on an external monitor but i get no display on original glitchy screen anymore and ive tried multiple working screens and they are all blank and ive tried the orignaly glitchy screen on a different macbook and that is also now black. But again it works perfectly on an external display. can anyone shed some light on what else could possibly be the cause of this? thanks

[roxboy1984]

bump!

[reformatt]

Integrated or discrete graphics? 2015 MBP use EDP, 2013/14 are LVDS and not compatible. Check LCD connector for corrosion/damage. Motherboard part number?

[roxboy1984]

Thanks so much for the reply. It's a discreet graphics. I haven't actually checked the connector for corrosion. I just found it strange that if it were the connector then surely the current screen would work on a different machine which it didn't. I will open it up and have a look under a scope and get the motherboard part number.

[piernov]

2015 MBP use EDP, 2013/14 are LVDS and not compatible.

All Retina are eDP, it's the backlight control that's different between these two.