When dealing with older LCD screens, individual LEDs inside the backlight panel slowly degrade, shifting their forward voltage drop. This minor imbalance can trip the MP3378E's highly precise 2.5% current matching logic, triggering a complete shutdown even if the panel is safely usable. Modifying the protection behavior allows technicians to isolate whether the root issue lies within a faulty IC controller, an open boost diode, or a failing LED string array. Diagnostic Procedures for the Protection Circuit
OCP, OTP, UVP, OVP, LED Short/Open Protection, Inductor/Diode Short Protection Buck Converter Over-Current Protection (OCP), Thermal Shutdown Fault Handling & Updates LED Open/Short mp3378e protection pin upd
Before modifying any pin configurations, engineers should check the following variables: When dealing with older LCD screens, individual LEDs
: Monitors the boosted output voltage using a resistor divider network. If an LED string opens, the boost converter pumps up the voltage trying to maintain current; once the OVP pin exceeds its reference threshold (typically 1.2V to 1.25V internally), protection triggers. Diagnostic Procedures for the Protection Circuit OCP, OTP,