Ilpi354 — Va Schematic Updated
Understanding the ILPI-354 VA Power Board: Updated Schematic and Repair Guide
Blown Fuse: If the monitor is completely dead, check the ceramic fuse near the AC input. ilpi354 va schematic updated
Please ensure you're working from the current revision. Questions or feedback? Drop a comment below. Understanding the ILPI-354 VA Power Board: Updated Schematic
Common Q&A for the ILPI354 VA
Q: Can I use the updated schematic to repair a "VA" board if I have a "VB" revision? A: No. The "VB" revision uses a different transformer and MOSFET configuration. The ilpi354 va schematic updated only applies to boards with the white silkscreen "VA" in the corner. Input stage: Added soft-start RC network on the
Key changes
- Input stage: Added soft-start RC network on the VIN path to reduce inrush current and improve hot-plug robustness.
- Switching MOSFETs: Replaced dual MOSFET pair with a single higher-Rds(on) device plus improved gate resistor placement to reduce ringing and PCB area.
- Feedback loop: Re-tuned compensation network (R-C values) for faster transient response while maintaining stability across typical LED string variations.
- Current sense: Moved from low-side to high-side sense resistor option with jumper selection to support both accuracy and safety use-cases.
- Protection: Added thermal shutdown pad footprint and an optional TVS diode location for surge protection.
- Connectors & test points: Added clearly labeled test points for VIN, VOUT, ISENSE, and FB; consolidated connector footprints for two common pin headers to ease assembly.
- Layout guidance: Notes added for copper pour around VIN/VOUT, short/high-current traces, and dedicated analog ground island for the control IC to reduce noise coupling.
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The "Hot Side" of the ILPI-354 VA contains a large filter capacitor that can hold 300V-400V DC even after the unit is unplugged. Always discharge this capacitor safely before touching the underside of the PCB. 5. Repair Tips for Modern Technicians
Integrated Functions: The board combines the Power Supply Unit (PSU) and the LED Driver for the backlight. Compatible Models: Dell E-Series: E1916HV, E2016, E2216HV, E2316H. Dell SE-Series: SE2216H, SE2218HV, SE2219H. Common Technical Issues
- Missing component labels (e.g., PR301, PC151).
- Incorrect resistor values in the feedback loop (causing false “no backlight” diagnoses).
- Blurry MOSFET pinouts (leading to short circuits during replacement).