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I have a model HLM507W that will not turn on. No blinking lights--nothing. I have replaced the batteries in the remote but still nothing. I am guessing there is a fuse somewhere but the trouble shooting guide in the owner's manual is useless.

Hello rockyroad.
It sound like the tv is dead. So if you are not getting any signs of life (the minimum are the leds on the front of the tv) that means that you have a power supply board issue. Since those leds require a minimum 5 volts that are send from the power supply board. I suggest you’ll look online for a new one; you’ll need the part number printed on the board inside of the tv. That & the tv model number is strongly recommended when searching for a tv part online.
Good luck.