When we turn the tv on through our cable source, you can hear the tv try to turn on but immediately switches off. I tried holding in the on/off button and although you can hear it trying to turn on, it won't stay on
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try switching to a different video source and play a DVD or a game system. If the issue is still there try unplugging the TV for 5 min. and then plug it back in.If the problem works fine on all other devices except the video source that has the issue try hooking up the same device your having the issue with to a video source you know works if that works then you have a bad video source on the back of the TV, if it does not work it's either the cable going to the TV or the device itself.
If the tv has a built in discoder, it is the decoder at faulty, bypass the decoder using a dvd player, and if that plays then it will prove the decoder fault, the dvd signal is stronger than an external source, oh, by the way, unplug any source of dish/arial etc to the decoder, giving the dvd master control of the tv
check settings on your source...make sure you are not plugging into a DVI/HDMI port on your TV unless you are in fact converting from DVI to HDMI (there a connector to buy) if thats not it replace the cable with a different one. There are several varities of HDMI cable and the signal is faster as you increase in price normally. I have Monster cables that work Perfectly....I would also check TV settings on the port you are plugging into and try a different one to see if the result is the same. If the result is the same you may have a bad source. Always rule out the cable too.
mine has done this as well, all you need to do is turn off the tv, unplug your cable going into the tv, turn the tv back on and switch the source to analog instead of digital. then you can plug the cable back in and BAM! hope this helps someone.