While the pb753 schematic is a ghost, you can get 95% of the way there with these alternatives:
Ensure the external power adapter provides the correct voltage (usually 19V or 24V). tp.ms6486t.pb753 schematic
(Refer to Sheet 6)
While a full standalone PDF of the PB753 schematic is often restricted to authorized service centers, partial diagrams and layouts are included in the Hisense MSD6486T (CVTE) Manual Key areas to check during repair: No Power/Standby: While the pb753 schematic is a ghost, you