The 17IPS72 is a Switch-Mode Power Supply (SMPS). It converts high-voltage Alternating Current (AC) from your wall outlet into regulated, low-voltage Direct Current (DC) to power the TV's mainboard and LED backlights. The board operates through four main stages:
：断电并放电后，使用万用表DC电压档测量主电容C101/C102两端。正常值应为~325V（230V AC输入）。如果读数为0V，问题出在保险丝、NTC热敏电阻、桥式整流器或线路断路；如果~325V正常，说明AC输入级和整流部分完好。 17ips72 schematic work
Upon receiving AC, the board first generates a low-power standby voltage to run the TV's infrared receiver and main processor. The 17IPS72 is a Switch-Mode Power Supply (SMPS)
：如果待机控制器正常工作但无+5V_STBY输出，可能次级侧存在短路——常见于+5V_STBY输出端的肖特基二极管（如SS34、SB560）击穿短路，或5V线路上的滤波电容短路。 17ips72 schematic work