After conducting a thorough search, I found that the "Vestel 17IPS12" appears to be a model of a monitor or display device from Vestel, a Turkish electronics company.
Follow the gate drive signal from the standby PWM IC (IC901) to the standby MOSFET. Use an oscilloscope to check for a square wave. No wave → Check VCC pin of IC901 via startup resistors. vestel 17ips12 schematic
Armed with a multimeter and the schematic, the technician dives into the "no backlight" mystery. After conducting a thorough search, I found that