You should read approximately 320V–340V DC across the main filter capacitor (bulk electrolytic capacitor) in 220V–240V regions. Standby and Main SMPS Controller

The 17IPS12 has several known failure points that can be diagnosed with a multimeter, soldering iron, and schematic.

The 17IPS12 schematic details a designed to convert high-voltage AC mains into the stable DC voltages required by a TV’s mainboard and backlight system. Key sections of the schematic typically include: