The is a widely used power supply board found in LED TVs from brands like JVC, Hitachi, and Toshiba. This schematic guide covers the primary functional blocks, common failure points, and key components based on the 17IPS72 R4 and 17IPS72R3 revisions. 1. Power Factor Correction (PFC) Stage
Disclaimer: Repairing power supplies involves working with high voltages that can cause serious injury or death. Always follow proper safety procedures, such as discharging capacitors before touching the board and using an isolation transformer if possible. If you are not comfortable working with live AC/DC circuits, please consult a professional.
Controlled via the PWM_DIM signal on pins 7 and 8 of the interface connector. 17ips72 schematic
), Metal Oxide Varistor (MOV) for surge protection, and X/Y safety capacitors paired with common-mode chokes. 2. Bridge Rectifier and Main Filter Capacitor Converts AC voltage into raw DC voltage.
The rectified AC feeds into the active PFC circuit. Controlled by a multi-pin PFC driver IC, this stage uses a and a boost inductor to step the crude rectified voltage up to a stabilized 400V DC bus line . This high-voltage bus line acts as the main reservoir for the primary switching transformer and backlight rail. 3. Main Switching & Secondary Rectification The is a widely used power supply board
standby, along with high-voltage DC for the LED backlight driver.
High-value resistors in the PWM IC start-up circuit can go high-resistance. 4. Key Components on the 17IPS72 Board PFC Controller & MOSFETs: Controls the Secondary Diodes: Rectify the output to low-voltage DC ( Electrolytic Capacitors: Common failure point (typically 5. Tips for 17IPS72 Repair Controlled via the PWM_DIM signal on pins 7
The schematic is essential for troubleshooting this board, as it is prone to several well-documented failures: