This is a common problem with lcd panel tv's. There is a problem with your power supply. Here are the steps you need to take.
1. Lay the tv face down on a cushioned table. Make sure the table is large enough to support the entire tv, You don't want to damage the panel.
2. Remove all the screws securing the back of the tv to the front.
3. Remove the back
4. Check the power supply pcb for puffed capacitors. If they are puffed, they need to be replaced.
5. Remove all connectors and screws from power supply pcb. This is the board where the power cord attaches.
6. Replace capacitors with equal or slightly greater valued capacitors. The values are marked on the capacitors in mfd and voltage.
7. You wil need a soldering iron to remove and replace them
8. Install the power supply pcb back into the tv and replace the connectors
9. Connect the power cord into the back of the tv and turn on.
10. Check to see if backlight comes on.
11. If it does, press menu button and lift tv up to see if you have an onscreen display. If you do the repair is complete.
If you don't you need to take a digital multimeter and check the voltage ouput from the connectors of the power supply pcb. Connect black lead of your meter to chassis ground and use the red lead and touch each individual pin to see if you have the correct voltage. The voltage levels are printed on the power supply pcb. If they are non existent, then you need to replace the power supply.
You said that you have no power light indicator led on the front panel at all. This tells me you have no standby voltage. Good luck and let me know how you make out
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