ILPI-354 V.A is a critical power supply and LED driver board (often called an inverter board) used primarily in several budget-friendly Dell monitor models. This board manages high-voltage AC-to-DC conversion to power the monitor's logic board and the LED backlighting. Technical Overview
The board is commonly found under part numbers such as 491A011H1400H03 and 790JX1400603R00 . It is factory-installed in the following entry-level Dell monitor lines: : E1916HV, E2016HL, E2216H, and E2316HF Dell SE-Series : SE2216H, SE2218HV, and SE2218HN Core Circuit Blocks in the Schematic
The large filter capacitor on the primary side can hold a charge of over 300V DC long after the board is unplugged. Use a high-wattage resistor to safely discharge it before touching the board. Ilpi-354 V.a Schematic
: The primary switching system uses a highly integrated offline switcher IC (often from the LinkSwitch or Power Integrations family, matching layouts like the LNK354 series). This chip controls an onboard MOSFET that pulses the raw high-voltage DC through the primary winding of the main step-down isolation transformer at high frequencies (usually between 65 kHz and 132 kHz). 3. Secondary Rectification and Feedback Loop (Cold Side)
The lifeblood of the Ilpi-354 V.a lies in its power regulation. The schematic reveals a robust linear power supply design, typical of the era in which this unit was conceived. ILPI-354 V
: Typically provides a regulated 5V DC supply to the main control logic board and a higher voltage (around 17.5V–18V ) for the LED driver circuit.
Thermal stress fractures on solder pads, degraded primary switching MOSFET It is factory-installed in the following entry-level Dell
When diagnosing a faulty ILPI-354 V.A board without a physical printed schematic, technicians rely on standard circuit tracking. The most common component failures manifest through explicit symptoms: Symptom 1: Monitor is Completely Dead (No Power LED)
Here is a systematic repair approach:
By systematically using the schematic to trace voltages and checking the components known to experience high thermal stress, you can successfully repair the ILPI-354 V.A board and extend the life of your LCD monitor.
Understanding the core blocks of the schematic—the , the main MOSFET (Q850) , the secondary Schottky diode (D854) , and the backlight driver —is key to a successful fix. For DIYers, this board represents an excellent learning opportunity. With the right approach and a multimeter, what may seem like a dead monitor can often be brought back to life for a fraction of the cost of a new one.