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Hi Marjule , I`m JackPerhaps I can help you with this problem , a few questions coming up and please note that it may take a few minutes between replies;
When this happens , is the screen just blank with some background light or completely dark like when the tv is off ?
Can you see the tv`s own menu for example ?
Also ,Can you please give me the tv`s model number written on the back cover ?
Sorry but I tried to accept that phone offer which was sent by the website by the way , not me and it said payment failure , probably that your CC company declined the charges but in any case this chat will do as well .
I have a pretty good idea of the problem but all I would need is for you to answer my question about the background being dark or blank with some background light .
Then if you want exact details I would need the model number otherwise I will give you an educated estimate that will be pretty close