My JVC TV keeps going into standby mode?

when i try to put my JVC 28 inch TV model AV-29sx4ek 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 comes up for about 5 seconds it drops back into standby mode again can anyone help?????

Could this be a dry solder joint?

The problem progressed rapidy within one evening. The first couple of times after it went into standby and then put back on it would usually be ok for about 1 hour each time, the next couple of times it would stay powered up for about 30 minutes.