If you are trying to bypass the backlight protection or troubleshoot a "no power" issue, check the voltage regulators
If the exact is unavailable for your exact revision (e.g., v1.2 vs v1.5), you can still use a generic TSUMV56 reference design. The pinouts are 90% identical. The main differences usually are: Tp.v56.pb801 Schematic Diagram Pdf