Often, the MOSFET or driver IC powering the LEDs fails.
Repair reports for this board typically highlight several recurring failure points: No Standby Lights:
对于正在为此类故障寻找解决方案的读者，建议参考本文的诊断步骤，并务必获取与你的板卡修订版本完全匹配的原理图，这样将大大提高维修的成功率。 17ips72 schematic work
The PWM controller IC for the standby circuit often fails. B. TV Stays in Standby or Fails to Start (Power Cycle)
If your TV shows no signs of life, the problem is almost always on the or the standby circuit : Often, the MOSFET or driver IC powering the LEDs fails
When you press the power button, a signal named (Pull-up to +3VLP ) drops to 0V. The EC (IT8226VG) sees this. If the EC is healthy, it asserts SUSP# (Suspend signal).
is your TV showing—does it have a standby light, or is it completely dead? AI responses may include mistakes. Learn more 17IPS72 Repair TV Stays in Standby or Fails to Start
Due to aggressive cost-engineering and thermal challenges inside thin TV chassis, the 17IPS72 suffers from repeating failure points.
If you can tell me the your TV is showing (e.g., blinking light, no sound, no picture) or the exact revision printed on the board, I can provide more specific troubleshooting steps.
Architecturally, it relies on a primary-side pulse-width modulation (PWM) controller to regulate power delivery and a secondary-side feedback loop to maintain stable output voltages. The board typically provides a single main DC voltage rail (usually 12V) to power the TV's main mainboard, alongside a stepped-up current-regulated supply for the LED backlight strips. 2. Primary Side: Mains Rectification and Filtering