Limits the transformer's secondary voltage to avoid arcing.
Desolder the small capacitor (usually labeled C_PRO or similar) connected to Pin 11. Measure its resistance. A healthy capacitor should show open circuit (infinite ohms) after an initial spike. If you see a steady resistance under 100k ohms, replace the capacitor. lx1692 protection pin
If you bypass protection and see one part of the screen is darker, or hear a "hissing" sound, you have found the faulty lamp or arcing transformer. 💡 Key Technical Specs Operating Topology: Resonant Full Bridge. Package Type: 20-Pin TSSOP or SOIC. Dimming: Supports both Analog and Digital (PWM) dimming. Limits the transformer's secondary voltage to avoid arcing
In many community repair guides, Pin 1 or Pin 14 (depending on the package/version) is often cited as the target for disabling protection, though this varies by the specific board implementation. A healthy capacitor should show open circuit (infinite
Only bypass the protection pin to confirm that no other major faults exist (like a shorted MOSFET). If the backlight stays on after bypassing but looks normal, you likely have a false trigger from a leaky capacitor, not a real fault.
Detects if a lamp is disconnected or broken.
