Check continuity across F1. Check for a short between the Drain and Source on the primary transistor.
Recap the entire low-voltage rail section using high-quality, low-ESR capacitors (e.g., Nichicon, Panasonic) rated for 105°C. (Backlight drops after turning on)
Integrated Switch-Mode Power Supply (SMPS) + LED Backlight Driver.
| Pin | Name | Function Description | |------|---------------|----------------------------------------------------------------------------------| | 1 | COMP | Compensation pin – connects to an RC network for loop stability. | | 2 | VFB | Voltage feedback input – from optocoupler (TL431). Inverts output voltage sense. | | 3 | ISENSE | Current sense input – monitors MOSFET source current via a resistor (0.22–0.47Ω).| | 4 | RT/CT | Oscillator timing – resistor to GND, capacitor to Vref sets switching frequency. | | 5 | GND | Ground – return for both power and control signals. | | 6 | OUT | Gate driver output – connects to MOSFET gate (series resistor ~10–22Ω). | | 7 | VCC | Power supply – filtered DC voltage (typically 12–18V). | | 8 | VREF | 5V reference output – for external circuits (max 20mA). |
It is possible that refers to a specific Power Supply Board or Inverter Board used in certain LCD monitors (often associated with brands like Acer, Dell, or LG). If you are looking for a review or update on this circuit: ilpi354 va schematic upd
The board coordinates its functions with a secondary logic or "driver" board (frequently the or ILIF-460 V.A ), which handles incoming video signals (VGA/HDMI) and dictates when the power board should sleep or wake up. Schematic Topology Overview
Blown Fuse (F1), Shorted Primary MOSFET, or shorted Bridge Rectifier.
Converts high-voltage Alternating Current (AC) from your wall outlet into regulated low-voltage Direct Current (DC).
If you need to replace the board completely, you can search for the ILPI-354 V.A Go to product viewer dialog for this item. on sites like 365powersupply.com or AliExpress. Check continuity across F1
While proprietary factory schematics are tightly guarded by OEMs, the layout of the ILPI-354 V.A relies on highly standardized, generic architectures. Below is the component mapping for the most common failure points. Primary (Hot Side) Section
on Pin 9 of the DP860EGN; if burnt, it will cut power to the driver chip. Capacitor Failure:
Dual-diode packages in TO-220 or surface-mount formats that smooth the high-frequency switching AC output from the transformer into clean DC rails.
Disclaimer: Repairing electronics, especially power supplies, involves high voltages. Ensure the unit is unplugged and capacitors are discharged before working on it. Inverts output voltage sense
Completely isolated from the AC line via the main chopper transformer and optocouplers. It steps down power into low-voltage DC rails (typically 5V for the monitor's main logic board and 12V–14V for the backlight inversion circuitry). 2. Unofficial Schematic Breakdown & Key Components
Measure the DC voltage across the leads of the main 400V/450V electrolytic filter capacitor. If reading roughly 1.4 times your local AC grid voltage (e.g., ~160V DC in North America or ~320V DC in parts of Europe), your input bridge rectifier is functioning. If this capacitor reads 0V, verify continuity through the ceramic main line fuse.
Drives the boost coil inductor. Check for Source-Drain shorts. LED Driver IC DP860EGN Controls backlighting boost cycles and dimming logic. F801 Input Fuse T2.5A / 250V (Slow-Blow) Radial or cartridge format near AC receptacle. Safety Advisory