This is the most common hardware failure on the x28 TCON (depending on severity, can kill the main power supply IC).
Odd, because the reference design for the supply was used :/
For anyone under warranty, contact directly and I'll fix for free, including shipping on TCON, or if you want to do the full display, you cover shipping.
For anyone out of warranty, contact directly and I'll fix for free, except you pay return shipping, on TCON or full display, your choice.
Thanks,
zis