: Over-Voltage Protection input. It samples output boost voltage via a resistor divider.
Inside the MP3378E, the UPD pin has:
If you are running fewer than 4 LED strings, or if one string is permanently dead and you want the panel to run on the remaining operational lines: mp3378e protection pin upd
Bypassing protection permanently is highly dangerous and strongly discouraged for consumer use. Doing so removes critical safeguards against thermal runaway, component degradation, and potential electrical fires. It must only be used as a short-term diagnostic step on a controlled isolation workbench. How Technicians Analyze the OVP Pin : Over-Voltage Protection input
at the pin), the IC stops switching to prevent damage to the external MOSFET or output capacitor. which can damage components
Bypassing protection mechanisms is an advanced diagnostics-only procedure. Disabling safety features permanently removes short-circuit and over-voltage safeguards, which can damage components, melt diffuser sheets, or cause a fire hazard. Use this procedure only to locate faulty components.
The is a dual-function integrated circuit commonly found in monitors, combining a 4-channel LED backlight driver with a high-efficiency buck converter . When repairing backlight issues, technicians often look for ways to "bypass" or "update" the protection behavior to diagnose whether the fault lies in the LEDs or the driver itself. Key Protection Features