Section 1 (Input)

To help you with the specific problem you are facing with your ILPI-354 V.A board, could you tell me:

The driver chip expects around on Pin 9 to turn on the backlight converter.

The is a power supply and LED driver board primarily used in various Dell LED monitors . While a complete high-resolution schematic is rarely available as a single public document, technical teardowns and service logs provide a clear picture of its architecture and common failure points. Technical Overview

The ILPI-354 V.a is most frequently discussed in technical forums regarding the repair of budget-friendly Dell displays: Component Failures

: Uses ENA (Enable, ~3V) and DIM (Dimming, ~2.5V) signals from the main logic board to control backlight brightness and power states. Common Troubleshooting Points

The board is a combined Power Supply Unit (PSU) and LED Driver. It typically features: Primary Section:

The defining feature of the ILPI-354 V.A schematic is its current monitoring capability.

[ AC Input ] ──> [ 1. Primary EMI / Rectifier ] ──> [ 2. Flyback Switching (PWM/MOSFET) ] │ ▼ [ LED Backlight ] <── [ 3. Secondary DC Output Rails & Driver ] <──┘ 1. The Primary AC Input & EMI Filter Stage

The heart of the converter stage handles the active step-down conversion:

| Source | What worked | |--------|--------------| | | Searched “Ilpi 354” – zero hits, but “Ilpi power supply” gave a similar 24V/15A model schematic. | | German DIY forums (Mikrocontroller.net, Radio-Bastler) | Found a thread from 2009: “Hat jemand Schaltplan für Ilpi-354 V.a?” – reply had a hand-drawn partial diagram. | | Archive.org | Wayback machine on a defunct electronics repair site – cached image of the PCB layout. | | eBay Kleinanzeigen | A seller in Munich had a “defective Ilpi-354” – I messaged them and got a photo of the interior wiring. |

This specific power board version is widely compatible with entry-level and professional Dell monitor models from roughly 2015–2016: Dell E-Series: , E2016HL, E2216HV, E2316H, Dell SE-Series: SE2216H, SE2218HV. Cross-Compatibility:

After replacing all blown components, initial power-on showed normal 4.975V and 18.81V outputs. However, after installing the board and plugging in a VGA cable, the power supply would shut down completely. The VDD pin of U850 dropped to ~1V (normal is ~14.99V). The solution? Remove the U850 IC, clean the pads, and reinstall it with a small piece of paper (a "shim") placed under the chip before soldering. This lifted the IC slightly, resolving an intermittent short or poor contact.