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Suggested measurements: AC at inlet, DC across bulk cap, standby rail voltage, switching node waveform (oscilloscope), diode/short checks on secondary rails.
The most frustrating part of repairing this board is that the manufacturer (usually a generic Chinese ODM) does not release official schematics to the public. However, the repair community has reverse-engineered and shared accurate versions. t.vst59.031 schematic diagram
Consists of DC-to-DC buck converters that step down the 12V input to 5V, 3.3V, 1.2V (Core voltage), and 1.8V (DDR voltage). Audio Power Amplifier: Suggested measurements: AC at inlet, DC across bulk