42LG5010 sound no picture.

[pan]

Hi
I’ve Located the fault on the master inverter panel (VIT71053.50 Rev3).
F1 is o/c (no 24 volts) it’s a SMD with 20 written on the top.
When I bridge the device the backlight / picture comes on and all seems fine.
Not sure what the value is (I’ve not got a diagram).
Any help much appreciated.

Thanks
Pan