OV_SNS通过一个外部分压网络（典型分压比约为1000:1）监视冷阴极灯管两端的电压。芯片不仅用它来实现开路灯管电压的精准稳压调节，还用它在启辉（Strike）和正常点亮（Run）阶段中监控灯管开路故障。

The Protection Pin is the physical manifestation of the chip’s

At its core, the LX1692 is a sophisticated PWM controller. It drives the MOSFETs that generate high voltage. However, high voltage comes with high risk. If a transformer arcs, a capacitor shorts, or a lamp disconnects, the results can be catastrophic—not just for the light, but for the PCB traces and the silicon driver itself.

To bypass the protection circuit for testing:

What do you get on the supply and enable pins? Are you working with a TV or a monitor board ?

Unplug the CCFL lamps from the inverter. Use a known-good test lamp or a high-voltage probe. If the protection pin stays low without lamps, the lamps themselves are the problem.

When an LCD panel shuts off just seconds after turning on, use this systematic approach to isolate the root cause:

When an LCD display cuts out after 1–2 seconds, the LX1692 protection loop is actively performing its job. Technicians must isolate whether the controller is accurately spotting a real high-voltage failure or shutting down due to component drift. Step 1: Physical Component Inspection

from the protection-related pin (often Pin 4 or Pin 14, depending on the specific board layout) to Ground (GND) can "trick" the chip into staying on. Alternative : In some variations, technicians use a