Powers on but no internal display

Hi all, hope someone can help, I've got a MacBook Pro 13" Retina Display Mid 2014 a1502 / 820-3476 which is powering on but has no internal display. I've connected it to an external display and I get the initial login screen then as it continues to boot the screen seems to switch back to the internal display and I get no video.

SMC reset done

PRAM reset done

disconnected everything and disconnected battery and reconnected

I have tried to reseat the display connection to no avail, if I leave the internal display disconnected and power on it boots and displays to the external machine and works perfectly, but as soon as I reconnect the display it will not boot to the external screen.

I've tried another screen / new display connector / checked to make sure it's not the backlight.

Not sure what else it can be - it's not had water damage I've checked the board over using the microscope no obvious signs of blown caps or anything and no signs of corrosion.

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