Lx1692 Protection — Pin ((exclusive))

LX1692 Protection Pin — Overview and Guidance

The LX1692 uses several pins to monitor for fault conditions like open lamps, broken lamps, or short circuits:

If one of the backlight tubes is cracked or its solder joints have failed, the transformer sees an infinite impedance. The voltage skyrockets, the over-voltage protection (OVP) circuit triggers, and the protection pin is pulled high. Fix: Replace the CCFL tube. lx1692 protection pin

To bypass the protection circuit for testing: LX1692 Protection Pin — Overview and Guidance The

• The Slow Blow: The pin is often tied to an RC (Resistor-Capacitor) network or a current sense circuit. This creates a "filtering" effect. A momentary voltage spike (noise) will not kill the screen. The capacitor on the protection line absorbs the transient, preventing "nuisance tripping."
• The Hard Fault: If a sustained over-current or open-lamp condition occurs, the external monitoring circuit (usually a transistor network sensing voltage from the transformers) pulls the Protection Pin voltage down below the fault threshold.

OVNS (Open Voltage Sense):

This pin is critical for Open-Lamp Voltage Protection . It monitors the transformer's secondary voltage through a resistor divider to prevent it from exceeding safe limits during striking or if a lamp fails. The Slow Blow: The pin is often tied