I verified hdmi and av cables one more time, with HDMI cable it seems that it is the cable issue itself, after changing the source to the appropriate hdmi source the tv screen goes strange.. next week hopefully I will verify it with different hdmi cables as they are not so cheap..
after checking the hdmi-hdmi mini cable I must admit this is an issue related to my TV, as the cable works fine with other TV. The other cable - AV - I don't have other device to check it..
one more thing I wanted to ask you, there's a light just above the REC/OK button, on the left of the screen, usually it shines when the power is connected and starts blinking when disconnected, but in my case sometimes it's blinking during the drive while the power is connected..