My Panasonic TV keeps going into standby mode?

when i try to put my Panasonic 28 inch widescreen TV model TX-W28R4DP on it just goes into standby with the red light on ....when i try to put it back on again with my remote control it powers back up again and it sounds like its coming back on again but just as the picture is about to come up it drops back into standby mode again can anyone help?????

I have general electrial knoledge and some soldering experience i feel this problem may be caused by dry solders but i need some advise!!!!

Ive been having problems with the picture on it for a couple of weeks now where the picture drops to the bottom half of the screen sometimes lower but when it mess wih the scart leads at the back of the TV (weather using AV channels of normal channels) it used to come back on this was a intermitent problem and may be on for days then other daysit would happen a couple of times