and 300K to GND) to limit the maximum duty cycle during the "strike" (lamp ignition) mode.
You can, but it is unsafe. It should only be done as a temporary test or on a device you are willing to risk destroying. For a permanent fix, replace the faulty component causing the trigger.
Before modifying the IC, check for common hardware failures: Transformers: Test input and output coils for continuity. lx1692 protection pin
When the protection circuitry triggers, it usually manifests in one specific, well-known symptom: The "Two Seconds to Black" Phenomenon The user turns on the monitor or television. The screen lights up briefly (for roughly 1 to 2 seconds).
The IC monitors voltage levels on specific sensing pins (like for over-voltage and ISNS for current). If these values exceed preset thresholds, the internal logic triggers the protection pin to stop the gate drivers. Common Shutdown Causes: and 300K to GND) to limit the maximum
Are you attempting to (like the "2-second to black" issue) or looking for a permanent hardware modification ? lx1692 PDF | PDF | Electronic Circuits | Capacitor - Scribd
Note: Pin numbers above are referenced from the standard SOIC-20 package versions of the LX1692 (such as LX1692E). Always confirm the pinout against the specific datasheet for your chip version. For a permanent fix, replace the faulty component
This pin uses an external resistor and capacitor to monitor the bridge power supply. It provides rapid response to line voltage transients and prevents transformer saturation by adjusting the timing ramp for open-lamp voltage regulation.
| Fault Condition | Trigger Source | Result | |---|---|---| | Open Lamp (OL) | Current feedback < threshold | PROT low → IC latches off | | Over-Voltage (OVP) | Output voltage > OVP threshold | PROT low → IC latches off | | Over-Current (OC) | Secondary current > OC threshold | PROT low → IC latches off | | Thermal Shutdown (TSD) | Junction temp > ~150°C | PROT low → IC latches off |