Sharp Aquos - Recent Questions, Troubleshooting & Support - Page 9

Checked Power Board is it any solder is not proper. Resolder all main point.

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

First try changing the batteries.
Next make sure when you press function on the remote control the red light on the remote displays under tv

Next try a remote reset:

You have to unplug the television after turning it off. Take the batteries out of the remote control. Point the remote toward the remote sensor (bottom right hand corner of the television set). Press the power button on the remote control and hold it down for 30 full seconds. Next press and release every button on the remote control. Next plug the tv back in and power it on from the power button on the television itself. Replace the batteries. Adjust the volume using the remote control. If that works the problem is solved. If it doesn't work you may need a software update, a new remote control, or repair to the sensor on your television.

To see if your remote control is working look at it through the viewscreen of a digital camera. The digital camera must be turned on and ready to take a picture. Next press a channel button on the remote control. Do you see a bluish white light? If so the remote control is ok.

You have a shorted printed circuit board.

You may want to make sure it's a Yamaha by seeing how the TV displays when connected directly to a cable box or DVD. Also try different HDMI or component inputs to see if it's something in the input connection you're using.