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Panasonic TH-L42E30M repairing backlight board

hello everyone,
i hope someone can help with a backlight board repair.

i have a TH-L42E30M that is getting BL_SOS triggered .
i'm getting this even if the LD2 is disconnected (power out for the LEDs).
24V is coming into the board properly and if i disconnect the backlight board (LD4 and LD2) and short out BL_SOS to ground the TV boots up correctly (though without backlight ofcourse) i think it is the over voltage protection of the LED drivers that trips the BL_SOS signal.
now what can cause the OVP to trip  ?

which components should i check next ?

thank you.