17ips72 Schematic Work 2021 -
Regulates the high-voltage DC, boosting it to ≈ 400V for efficiency. This circuit frequently includes components like a MOSFET and a PFC controller IC.
Power supply repair carries inherent risks. The large primary capacitor can hold a even after the TV is unplugged from the wall. Always manually discharge this capacitor using a dedicated discharge tool or a high-wattage resistor before touching any component on the underside of the board.
| Pin Group | Pin Numbers (Typical) | Function | Signal Type | |-----------|----------------------|----------|--------------| | Power Input | 1, 2, 35, 36 | Vcc (5V logic) & Vm (12V motor supply) | Power | | Charge Pump | 5, 6 | CP1, CP2 – external capacitor connections | Analog | | Phase U Out | 14, 15 | U+ (high-side), U- (low-side return) | Output | | Phase V Out | 17, 18 | V+ / V- | Output | | Phase W Out | 20, 21 | W+ / W- | Output | | Current Sense | 23, 24 | ISENSE – external resistor to GND | Analog | | Hall Emulation | 26, 27, 28 | H1, H2, H3 – synthesized Hall signals | Output | | FG (Speed) | 30 | Frequency Generator – tachometer pulse | Open drain | | RD (Lock) | 31 | Rotation Detect – high when motor at target speed | Open drain | | PWM/Reference | 32 | VREF – speed control voltage input | Analog | | Brake/Enable | 33 | BRK – active high brake | Digital |
The board generates several regulated low-voltage outputs, typically +3.3V (standby), +5V , and +12V . 17ips72 schematic work
High-voltage DC from the bulk capacitor feeds into the startup pin of the PWM controller chip.
The primary side of the schematic handles the dangerous AC mains input and converts it into a raw high-voltage DC bus. AC Input and EMI Filtering
Typical tasks with the schematic:
Measure the voltage at the backlight output connector during power-on. If it spikes high and drops, an LED strip inside the panel is likely burnt out.
Shorted secondary rectifier diodes or dried-out electrolytic capacitors.
The entry point for AC mains, using capacitors and inductors to filter out electromagnetic interference. Regulates the high-voltage DC, boosting it to ≈
Always verify pins 12, 25, and 34 as GND. Many failed repairs are due to assuming a different ground pin.
If your model is (Ryzen 5000 + RTX 3060):