JVC AV-28WFT1EP Turns itself off (standby)

Hello, I've got a JVC AV-28WFT1EP tv. When I turn it on, the display lightens up, i see picture and OSD and then after a few secons it automatically turns itself off (standby) Is this a known problem, and is there a capacitor or something responsible for this? I hope you can help me. Kind regards Klaas

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