Dried or bulging secondary filter capacitors; Faulty feedback optocoupler loop.
Blown Fuse (F1), Shorted Primary MOSFET, or shorted Bridge Rectifier.
The mains voltage enters through a standard IEC C14 chassis plug. ilpi354 va schematic upd
The following components and circuit behaviors are critical for troubleshooting the power board:
Here is a logical step-by-step guide to repair the most common ILPI‑354 failures: The following components and circuit behaviors are critical
For those tracing signals, here is a quick mapping correction found in the latest revisions of the ILPI-354:
Before measuring live current, verify the board under high magnification. Check for thermal stress fractures around the MOSFET, discolored circuit board trace varnish, or leaky capacitors with domed tops. These are outlined in the schematic update table
While it is always best to replace a component with an exact original part, the repair logs show that several successful substitutions have been made. These are outlined in the schematic update table above and include: