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First check that the fuse in your fusebox has not tripped. If that is okay check the fuse in the power plug. If that is ok you may need to check for internal fuse. If that is ok and power is getting to the tv you will have to test the power control card and then the mainboard
I've got to ask this first....sorry....... Is it switched on ? And has the plug got a good fuse ?......OK... Next. Its probable that you have the TV set to HDMI or some other interface within the TV. On the remote, look for a button named 'source'...press it and a drop down menu appears on TV with a list. Scroll down with arrow buttons to selected TV. That should get you your picture or select scart if that is how your TV is supplied. Good luck...
Many electronics devices have fuses inside. Also power supply circuit devices can, of course, fail. If you want to open it to look for a fuse, there is usually a warning on the back about that. . . I have seen a set that went out as you describe, opened it, found a bad fuse. Replaced the fuse and the set has worked for years since.
Is your TV plugged into the Mains. Is the Mains fuse on the set ok. Your on/of switch could be faulty, or the Mains wire inside the TV is adrift and a Hell opf a lot of other situations could be your problem
1. Make sure the AC power source is ok.
2. Make sure the AC power cord is good with no damage.
3. Look to see if there is a reset button on the rear of the set. If not, then look for a blown AC fuse inside the set.
Since the set works fine on +12VDC, the majority of the TV set is ok. You have a problem in the AC power supply. It could be a blown fuse, bad rectifier / regulator, bad step-down transformer.
The TV typically runs from +12VDC. The AC supply steps-down the 120VAC and rectifies it into +12VDC to power the TV. At some point in the TV, there is junction point where the +12VDC from the sets internal AC supply meets the external +12VDC power source. Usually they are electrically isolated from each other with a switch or with diodes.
Please let me know if I can be of further assistance to you.
Oh come on man the sets tired!!!LOL no really you got plenty of use out of this bugger. Your problem sounds like something opened in the power supply and since the sets all solid state theres no user serviceable parts inside them. If you really wanted to put cash into a 10 year old set for an estimate/? i would not . But if you like the set go for it. Good luck