Hi Dave,
If it's fitted with a Chi-Mei panel type V260B1-L01 White screen for the first hour or so the screen is faulty. The cure is to take the screen apart, and apply a bit of preasure to the first data driver. Ie when the screen is apart first chip on film top left.
I have done well over 30 this year alone, and none have bounced yet. (Fingers crossed).
Regards,
UGM.