: On some LG or Samsung panels, you may need to physically move a resistor (e.g., from R20 to R23) on the T-Con board to change the mirroring state.
If the service menu doesn't work, you will need the specific firmware matching your (e.g., 1366x768 or 1920x1080) and Frequency (100Hz). Download VST59S P89 Panel 100HZ Mirror USB rar
What is the of the LCD panel you are using with this board? Knowing the resolution will help identify the exact firmware version needed. How to fix Mirror problem after install new panel in led tv : On some LG or Samsung panels, you