If voltages are pulsing (hunting), it often indicates a failure in the feedback loop or the oscillator driving the MOSFET not maintaining continuous oscillation. optocoupler feedback components. Reference Resources
across the large primary filter capacitor (if the PFC is running). If it stays at ~310V (in 230V regions), the PFC is not active. Primary Check : Test the primary MOSFETs and the main fuse. Secondary Check 17ips72 schematic work
The backlight circuit usually features a dedicated step-up (boost) converter IC (such as the MP3394S or AP3608EM-G1). It takes the basic secondary +12V or +24V rail and boosts it up to the 30V–70V DC required by the specific LED strip array inside the panel. If voltages are pulsing (hunting), it often indicates
Each phase pair (U+/U-, V+/V-, W+/W-) goes through a series of protection diodes and then directly to the spindle motor connector. Use a multimeter in continuity mode to map which pin corresponds to which motor winding. If it stays at ~310V (in 230V regions),