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Have you got a video camera? Here is the trick to find out if the remote doesn't really work, or it's the TV that is not picking up the remote signal. Most remote use an infrared led to beam signals to the TV's. And this trick will show you whether that remote's LED is actually working. You and a friend or member of the family is all you need to begin testing your remote. Ask your friend or family member to hold the remote and you hold the camera on without recording. Point the remote about 5-6 feet from the camera. You watch the camera monitor screen while your friend or family member presses the On button or presses the buttons that you think are not operating the TV. With a dim room light, you should be able to see a flickering light coming from the remote in the camera screen. If it's hard to see, which I doubt, since remote infrared LED are pretty bright, you can turn your room lights off and try again. If the flickering LED from the remote is seen and is bright, then try all the buttons on the remote, or at least try the ones that you say are not working with the TV. If all is well, then there is nothing whatsoever wrong with the remote, but chances are that though the remote may beam out infrared light, it doesn't mean it is the right frequency for the TV. It could have lost the frequency and no longer sends the correct signals for the TV. However, the problem can also be with the TV remote's LED receiver. This falls into the hands of a technician's inspection on whether the receiving end of the remote is effective or needs replacement. In this part, you need to have the TV checked.
Check the remote control for its infra-red emission. Check it with fresh batteries. Check by pressing all the buttons on it; and see whether all of it generates infrared signal while pressing. If it is found OK, check and replace the infrared sensor inside the TV. If you wish to get some details; check the site linked here. It has details about how to check a remote control; by one among the post. Pull up older posts. If the remote control is found OK; check and replace the infra-red sensor inside the TV. Contact any service technician. http://electronicshelponline.blogspot.com/ http://schematicscom.blogspot.com/ http://homenol.blogspot.com/
Search the site by type in this key phrase "how to test a remote control "in the "search box at the top right of the display window of the Homepage" to get the related post quickly.
Or Google 'SANYO GXDB remote" Testing remote control: The remote control puts out IR (InfraRed) signal that human eyes cannot see, to find out if the remote is sending out the signal or not you just point the remote at the digital camera's Lens (Digital Camera can detect IR), you should see flashing light on the camera's screen when any one of the remote button is pushed. If you do see the flashing on the camera, then the problem is in the TV IR receiver or the main logic board; more troubleshooting with scope will be needed to look at the signals. Parts: www.shopjimmy.com