Measure at the output connector. If 0V, check the startup resistor (usually high-value resistor near PWM IC) and the PWM IC itself. 2. Flickering Power Light or No Image
Using the schematic, locate F101 (T5A 250V fuse). If blown, do not replace it yet. Follow the schematic to BD101. Check for shorted diodes. The updated schematic highlights that (NTC Thermistor, 5D-15) often cracks.
The ILPI-354 is a combined power supply and LED driver board. It converts AC main power to the necessary DC voltages required by the logic board (usually 5V and 12V) and drives the LED backlight of the panel. Input: 100-240V AC Outputs: +5V Standby/Main, +12V Main, LED Backlight Drive Common Applications: Dell SE2216H, E2216HV, E1916HV. ilpi354 va schematic updated
If you are repairing an LG 32LF5100 or similar and the TV has sound but no picture, or is completely dead, this updated schematic is vital. It shifts the blame from the capacitors (which are usually fine on this board) to the SMD shunt resistors and solder joints on the LED driver coils , which are the actual failure points.
Most versions utilize the LD7575 or a similar Green-Mode PWM controller. The updated schematic confirms the startup resistor values (typically high-resistance, e.g., 1MΩ) which often fail open. Measure at the output connector
| Pin | Name | What you should see (Updated notes) | Common Failure | | :--- | :--- | :--- | :--- | | 1 | EN0 | (from VIN divider) | 0V = Bad resistors (R319/R320) | | 3 | VREG3 | 3.3V linear out | Short to GND (replace IC) | | 4 | VREG5 | 5V linear out | 2V-4V = Blown cap on 5V rail | | 6 | VO1_ON | 3.3V enable for 5V PWM | Check R326 pull-up | | 17 | VIN | 19V (via 2-ohm resistor) | Open resistor (look for burnt) | | 18 | EN1 | 3.3V (S5 enable) | 0V = S5 state stuck | | 23 | TRIP1 | OCL (Overcurrent latch) | 0V = Replace IC |
The PI354x series is versatile, serving multiple markets including telecom, data centers, industrial automation, automotive accessories, and consumer electronics like laptops. Specifically, the PI3541 variant is used as a main power management IC in some gaming laptops where stability under high current draw is critical. Flickering Power Light or No Image Using the
The is a significant improvement over initial service manuals.
: 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
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Whether you are a long-time follower of the project or just tuning in, this update brings the design one step closer to finalization.