Can you please elaborate on what this flicker looks like and when it happens?
Does it look like the brightness is flickering? Or are artifacts randomly appearing on the screen?
Is it constantly happening even when you're not touching the device? Or does it happen only when you do a specific action?
Have you tried the recovery techniques yet? [guide|111572]
My thoughts is the display ribbon cable needs to be reseated but I'll need more information before I can confirm this.