The switching transistor ( Q1 ) attached to the primary heatsink is a high-stress point. If shorted, always check the source resistor and the PWM chip for collateral damage. 4. Safety Warning
If the backlight flashes and goes out, the ILPI-354 VA protection circuit is likely tripping due to a bad lamp or a faulty inverter transformer.
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.
Look for components labeled CX1 and LF1 . Blown fuses ( F1 ) in this area usually indicate a catastrophic failure in the Bridge Rectifier.
The switching transistor ( Q1 ) attached to the primary heatsink is a high-stress point. If shorted, always check the source resistor and the PWM chip for collateral damage. 4. Safety Warning
If the backlight flashes and goes out, the ILPI-354 VA protection circuit is likely tripping due to a bad lamp or a faulty inverter transformer. ilpi354 va schematic updated
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. The switching transistor ( Q1 ) attached to
Look for components labeled CX1 and LF1 . Blown fuses ( F1 ) in this area usually indicate a catastrophic failure in the Bridge Rectifier. ilpi354 va schematic updated