If your Switch OLED is dead, the schematic tells you to probe these points in order:

If you're new to console repair, try fixing a common issue (like a faulty M92T36 chip) using a guide first. As you gain experience, the schematic will start to make much more sense.

The internal storage is doubled to 64 GB eMMC , but unlike earlier versions where the storage was a separate module, it is now integrated into the main circuitry. Cooling and Power Distribution