i went and bought philips ambi-light lcd tv today

i seem to have a problem with it tho

when i turn it on it will only stay for 5 mins then it
turns itself off and it wont come back on unless i turn the main
plug on and off

then when it does actually stay on for more than 5 mins if i try to
change the channel with the remote control it just automatically turns itself off

i have checked all the plugs and leads and they are in the correct places

has anyone else had a similar problem

and help will be much appreciated

cheeRS