Some designs allow the host controller to read the PROT pin via an ADC. If UPD is persistent but the backlight is functional at reduced brightness, implement:
Drives the external MOSFET for the boost circuit. MP3378E - Mouser Electronics mp3378e protection pin upd
While specific to other ICs like the ACM20005, common technician tricks involve using a diode or resistor to ground a protection pin to see if the backlight stays on. Warning: Bypassing protection on the MP3378E can lead to permanent damage to the IC or the LED panel if the underlying fault (like a short circuit) is not fixed. Pinout Summary (TSSOP-28 EP Package) Some designs allow the host controller to read