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How can i tell if the remote contol is defective or whether it is the television set

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Some electronic suppliers, maybe radio shack, sell little cards that light up when the remote or any infra-red light hits it. If you have another same brand remote or TV you can see if it works that set (maybe a family member or friend as the same brand of TV). Other then those choices the IR pulses can be seen with an oscilloscope.

Posted on Sep 07, 2009


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My television no longer accepts commands from the remote. I have verified that the remote control is working properly. Please advise.

If your TV doesn't accept remote control signals, the infrared remote sensor inside your TV may fauty, or it doesn't gets proper voltage to work. I don't know the way you have tested your remote contol for infrared emission. Any way do this check once more. You must have a cellphone with camera option. Put it in camera mode, place your remote control in front of the its lens a little apart from it, and press all buttons on your remote to see there is any infrared signal comes from it and all buttons are working or not. Most cellphone cameras can detect infrared rays, and will show its indication of its screen.
If this test is Ok, then proceed. Take all precautions we take while working with an electrical equipment. Since as high as 27KVDC [27,000 volt DC] points are there inside your tv, you must be very carefull. Open the back cover of your TV, pull out the main board, usually slipped in, towards front. You can locate the infrared sensor there in the board, diretly solderleld to it. Usually it have 3 legs, with one leg is a little apart from the other two. Check whether there is some voltge on its leg points. One of them is earthed [connected directly to negative], and usually the center one is its supply point. That point must get about 5vDC. In some Sony sets the supply point will be at the end pin. If there is voltage mentioned above, surely it is damaged. if there is no voltage find out the reason for that. It may be due to some loose soldering, or resistor failure. If there is votage, sensor may be defective. Resolder it and take it out from the mainboard and go for the same type and number. Its number will be printed on it [usually laser printed]. Insist on the same number and type. Never use other numbers, since Sony has special circuts and charcteristics for their components.
Ok Wish you success.

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1 Answer

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Without knowing what specific make and model you have, all I can do is offer generic advice. Have you tried unplugging the set for a few minutes to reset it? This may clear the control panel lockout. I'd also try a universal remote contol that can access necessary features. They're pretty cheap these days.
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