Panasonic TX-L39E6B error code one,back lights flicker on/off then shut down

[bonesy]

Hi folks got the above symptoms going on which I think is failed back lights.The screen is a Chinese
Innolux(might be spelt wrong) which by looks of it is edge lit fitted to a large metal plate.Has anyone changed these LEDs & how do they come apart?Do you have to strip screen down same as standard
LED strips or does the light bar pull out.
The screen type is V390 HJ1-LE6 REV.C5