Ilpi354 Va Schematic Updated ((free))

Working with the involves high-voltage DC rails (often 380V+ after the PFC stage).

| Ref Des | Function | Value | Notes | |---------|----------|-------|-------| | F101 | Primary fuse | 3.15A / 250V | Slow-blow | | IC901 | PWM controller | LD7535 (or compatible) | Pin 5 now correct | | QB801 | Backlight boost MOSFET | 60V / 3A | AO4404A | | R321, R322 | LED current sense | 2.2Ω, 1% (each) | Parallel | | R715 | ISET for LED driver | 100kΩ | Critical for brightness |

: Boost inductor, switching transistor, current-sense resistors, and a multi-channel LED driver control IC.

To help find specific component values or section breakdowns for your repair, tell me: The of the monitor you are working on. ilpi354 va schematic updated

: ILPI-354 V.A (often localized by specific manufacturing tags like 491A011H1400H03 or TC26227C ).

: Regulates and distributes +14.5V , +5V , and -5V to the monitor's main logic board and backlight inverter .

If you are looking at your circuit board right now, tell me what (e.g., completely dead, blinking light, clicking noises) so we can figure out which specific component to test first . Working with the involves high-voltage DC rails (often

Carefully measure the DC voltage across the main filter capacitor (C105). You should read ~320V DC. If 0V, check the AC cord, line filter, and rectifier diodes.

Standard 90V–264V AC enters the board. The EMI filter suppresses high-frequency noise from feeding back into the mains grid. The varistor protects downstream components from sudden voltage spikes.

The electrolytic capacitors on the 5V and 12V lines are prone to high ESR (Equivalent Series Resistance) or physical bulging. Replace any degraded capacitors with high-quality, low-ESR equivalents rated for 105°C. : ILPI-354 V

In summary, the PI354x series is a highly integrated and efficient solution for converting 48V down to useful low voltages. By understanding its core schematic, the role of its key external components, and the options for constant current mode, you can effectively design it into a wide range of applications. Always refer to the latest datasheet for the most current specifications and application guidance.

Blown startup resistor networks. The PWM control IC requires small start voltages through high-value resistors. If these burn out open, the power supply will never power on. Symptom: Power LED Blinks or Fails Under Load