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Black screen issue

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patmnr1:
Dear guys, I need some advices , when i switch on my led toshiba(47vl863) , for 30 seconds the image is ok then the screen goes black for one second, then image back to normal, it repeats for 3 to 4 times like that , then gets completely black with sound on, no backlight. I thought it was the inverter, so had it changed but the problem was not solved. My tv was on dynamic mode i.e. baclight at 100%, i noticed that when bringing the backlight to 40% (standard mode) the issue was over. It's quite frustrating to watch on standard mode. Any idea what could be wrong, which board has to be replaced?
Thanks for your help

jordan:
If you do something to help

sparky:
 Hi it sounds like one or tubes faulty can you hear any arcing or smell anything burning when going faulty

patmnr1:
Thanks for the schematic,
no arcing sound, nor smell when it happens, when I first removed the back panel , noticed that the inverter changed color l(brownish)ike if it was overheatered.
I was also surprised to find that not only the screen was of make Lg but also the power supply and the inverter.
Only the main board was made by Toshiba.

sparky:
Hi try and check connectors to tubes lg have a poor reliability with screens

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