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check the remote by looking at it through a digital camera while pressing a button on the remote if the light is visible in the camera then the remote is working and the IR sensor board will need replacement you can get replacement IR boards and the remote from www.tvrepairworld.com
IR sensors are tough devices firts make sure that your remote control is working view its ir led light using your phone camera you should see it flashing..another test is puting it near an AM radio ,you will hear an interference when you push any key. then the crystal is all right.Replacing the IR sensor means you really have to unsolder it from the circuit board and fing a replacement..I hope its just one of those cold solder ang not the IR sensor..Good luck.
You may find this is impossible to do---the receiver if the set has buttons on front will be located there--if on same tiny circuit board as buttons you will have to TRY to find a replacement board--Good luck as this brand often NO parts are available.
While all IR receivers are similar they have different values and mountings.
I will presume you had the remote itself TESTED which will rule it in or out.
Ir receivers sometimes show no function unless remote is right up very close are bad---they also of course can fail where there is not any responses shown.
I had the same problem. The front plate is tabbed into place and removes with a flat tip screwdriver and prying in various spots to pop out the tabs. Once the front stainless plate comes off, you need to get behind the black buttons. There is a circuit board behind the buttons, which they make contact with. The problem with mine was the circuit board pushed beyond two metal tabs that keep it in place, so that the buttons were unable to make contact. I used a curved tool to pull the circuit board back forward in front of the tabs and into place. I put the front plate back on and it works like a champ.
As far as I know, this set DOES NOT have the required tuner capability. Please note that the changeover only effects those using rabbit ears or a rooftop antenna. If you have cable or satelite, no change will be seen. The change over is from an analog broadcast signal to a digital one. Your set has a digital tuner that expects an analog input signal.
Most electronic control boards have undersized circuit wires that can't handle a catastrophic lamp failure. The circuit trace will open like a fuse. If you or someone knows how to use a soldering iron, this can be repaired. 1. Remove the top grille. (Two screws on top) 2. Remove screw above button panel. Push up on panel to remove. 3. Remove circuit board from panel. Look on reverse side for open circuit trace. 4. Repair circuit trace...lights work again....
If you need further assistance, let me know Regards, reg501