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Try checking the fuses in the back next to the plug. If they look burned or blown replace them. If the problem persists after the fact, the entire Plug Holder and Fuse Block may need to be replaced. Sometimes when the fuses blow they leave a black discharge on the contacts inside the fuse block rendering the fuse block useless and powerless.
All telivisions has fuses inside. Some of them has one, and some has two. If your tv doesn't power on, and power chord and outlet is ok, surely the fuse inside may blown out. There may be some reason for the blowing of fuse. Fuses are used inside tvs are for protection purposes. f any overvoltage or over current taken by the system, the fuse will blow out. you must fist find out the resom for the bowing of fuse. New fuse must be put in only after that check. Otherwise you will spoil the whole circut board inside the tv irrepairable. Concat a service personnal, and let him do that. Ok.
Remember, different tvs have different power ratings. Must select proper fuse according to the ratings.
If it sparks when plugged in that means the main fuse in the tv is not blown. If there was sorting wrong with the tv and you saw sparks the fuse should blow. If the fuse blew you will not see sparks anymore and the set will not come on. But if the fuse did not blow one of the following can be the cause. 1. A short in the line cord, check you plug and wire to make sure there are no breaks in the wire. 2. Sparking can be from a bad outlet, a plug that is not making good connection can cause sparking, try plugging in to another outlet if it still sparks check the prongs and make sure they are not blackened.
if you plugged a 125 volt tv in to a 220 volt outlet you more than likely fried alof of the componets in the tv. Putting a bigger fuse in there is only going to increase the risk of it catching on fire so i would not recomend that. you might replace the power supply and cross your fingers and hope that nothing else cooked when the 220 volts hit it
next to the fuse that blows is 4 large black diodes.one of those is common to short out. the bad one would give you areading of zero ohms when checked with a meter. or just replace all 4.most likely its location D603. hope this helps
Have you tried another outlet in the house? If it still blows a fuse there could be an internal issue in the TV regarding grounding. Can you temporarily connect a microwave oven or similar device to that outlet to see if the fuse still blows? If it continues to blow, you can at least rule out the TV being the cause. Is the TV new? Has any recent electrical upgrades been done? Are you using an extension cord or plugging the TV's power cable into the Cable/Satellite box instead?
One important step to do regardless for all sensitive electronics is to perform a power drain by unplugging the device or removing batteries followed by holding in the products power button for 1 minute. This flushes out the capacitors and circuit board of any electricity that can prevent normal functionality.