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Dec 16, 2020
Q) Why is my Kenwood remote not working? I JUST BOUGHT IT.
Credit to Tom Moertel for writing this article, the original can be found HERE.

The Kenwood audio-video receiver that forms the core of my home theater system stopped responding to its remote control. As I discovered shortly thereafter, having to leave the couch to fiddle with knobs degrades the “home theater experience.” Clearly, something had to be done.

I knew the receiver was the culprit because the remote control worked fine with other components of my system. I figured the IR sensor had gone bad and did a little Googling for “Kenwood” and “IR sensor” and “problem”. The results revealed that many other Kenwood customers had the same problem.

The cause of the problem, I learned, was that the solder joints which connect the IR sensor’s leads to the display board eventually fail because of thermal expansion. That explanation seemed to account for what I was observing, so I cracked the case in search of visual confirmation.

First, I found the joints where the IR sensor was connected to the circuit board. The vertical red line shows where I found them:

The insides of my Kenwood receiver

Then I examined the joints closely. Sure enough, at least one had completely failed:
Failing solder joints

The problem confirmed, I moved to the solution phase of the project. With my soldering iron, I touched-up the joints:
The repair: re-solder the joints

It wasn’t my best work, but it did the job. Now my receiver is back on speaking terms with its remote control, and I have returned to the modern world. Life is good

Feb 18, 2019
Q) Magnavox 20MS2331/17-How to get the CC or Menu off the screen.
A) The owner's manual says to use the Status/Exit button to remove the CC or Menu from the screen when you are through making your changes.
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Jan 24, 2019
Q) Remote for Sony Stereo System SSRG444
A) Sony SS-RG444 is the model of the Speakers. The Receiver is HCD-GX450. The remote is NLA (No Longer Available), but there is a replacement remote that has all the features of the OEM remote. It is $29.90 + shipping and can be found https://www.remotes.com/SearchResults.asp?Search=hcdgx450
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Jan 15, 2019
Q) ITV ILT-M4205FHD needs a new remote control.
A) ITV no longer has replacement remotes for this model. I recommend getting a universal remote control that has AUTO SCAN or SEARCH mode. The remote systematically sends each code it contains, one at a time, until the TV responds. Here’s a universal remote control with Auto Scan on Amazon.com
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Jan 7, 2019
Q) V-Zon TV2200
A) V-Zon is part of Coby. Matilyn needs a remote for a Coby V-Zon (VZon) TV2200 television. We have no OEM remotes and no replacement remotes for this model.
https://cobyusa.com/products/universal-remoteb shows a universal remote control model CRC-02 that may work. They don’t sell it on that site, but I did find a link to Walmart that sells it.
If you have a V-Zon TV and need a remote control, try using the Coby codes listed on many universals.
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Jan 7, 2019
Q) Sharp RRMCG1231CESA
A) The Sharp remote for these models, RRMCG1231CESA, G1231CESA, 13HM60, 19HM60, 19TH30, 20HM60S, 25HM60, RRMCG1124CESA, G1124CESA, 13GM60, 13TG30, 19GM60, 19GM120, 20GM60, 25GM60, now substitute to the Redi Remote RTRRMCG1231CESA. It does not need any programming and will work right out of the package. Here is a link to the product page.
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Jan 7, 2019
Q) Remote for Cambridge Audio Azur 840E
A) We do not have any OEM or replacement remote controls for this model, but we do have many replacement remotes for Cambridge Audio.
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What is the range of a remote control?

Remotes are convenient tools that make our lives a lot simpler, but they have their limitations. The limits often come down to the type of signal a remote sends. We’ll go over the differences and the limits in this article. After reading this, you can be confident of the range and limitations of the remotes you use every day, which can help you use your electronics to their potential and help with troubleshooting remote issues.

The vast majority of remotes for consumer electronics used today (2018) are infrared remotes. Invented in 1980 by ViewStar, infrared became the dominant kind of remote because it has a much larger range of functions that can be programmed in the remote than previous technologies. Many manufacturers use distinct frequencies of infrared light and unique patterns of light for each of the functions a remote can do. <a href=”https://science.nasa.gov/ems/07_infraredwaves:>Infrared</a> signals are light waves that are past the visible spectrum we can see. So, you won’t be able to see the signal the remote is sending with your naked eyes, but they can be detected by most digital cameras.
The limitation of infrared signals is the dispersion or blocking of the light. Most infrared remote signals will be too weak to reach past about 30 feet, or 30 degrees to the right or the left of the sensor in the unit the remote controls, but an object placed in front of the sensor will keep a remote from working at all. Since infrared is limited by line-of-site and dispersion beyond a very short distance, it only makes sense that they are now starting to lose ground in popularity to the latest type of remote which is the next category.

Second in the number of remotes in use today for consumer electronics, Bluetooth is quickly being integrated in all sorts of electronics because of its versatility. The Dutch company Ericcson invented Bluetooth in 1994 to wirelessly transfer data over short distances. Since then the standard has been used for all sorts of electronics including, wireless speakers, phones, stereo receivers, car entertainment systems, and many others. Bluetooth uses radio to establish two-way communication between the remote and the device it controls through an exclusive connection between the two called pairing. In the case of a TV that has a Bluetooth remote, this kind of connection allows for much more complex data transfer between the remote and the TV than with a traditional infrared remote. If you’ve seen commercials where people are talking into the remote to find TV shows or movies they want to see, they are using a Bluetooth connection.

Like all electronics that send energy signals, there is a limitation to the range because the signal attenuates or dissipates over distance. The first version of Bluetooth used a very low voltage transmitter which only reached 30 feet. However, Bluetooth 2.0 has improved the performance drastically both in the quality of data transfer and the distance the signal will reach. With 2.0, a signal is strong enough to transmit up to 100 feet away. One advantage of a radio signals is that it will go through wood walls and bounce around corners. Many Bluetooth devices do not need to have line of sight to the other Bluetooth device they are connected to. With Bluetooth, some manufacturers are even creating Apps for smartphones to use the technology and allow people to use their phone as a remote control.

Tiny hammers? Zenith invented a miniature piano that fits in the palm of your hand and used aluminum rods and small hammers to strike the rods which produces a soundwave that is too high for our ears to pick up. That is basically, what an ultrasonic remote is. Usually consisting of 4-6 rods early on, the ultrasonic remote was limited in what functions it could control, but it was a consistent performer and was the standard in Television remotes for about 20 years. The effective range of an ultrasonic remote depends on the sophistication and sensitivity of the sensor. Current sensors can detect an ultrasonic signal from about 20 meters or 70 feet away. However, attenuation of the signal (reduction of the strength of the signal over distance) varies. The higher the frequency, the shorter the distance the signal will travel because the signal doesn’t have enough strength to travel very far.

Ultrasonic remote controls for TVs only worked within about 20 feet of the television because of the technology of the time, and the amplitude of the signal was not boosted electronically.


Below is a chart that shows the type of signals used by each type of remote covered in this article and also the limitations of each technology.









20 feet, not limited by direction.

Number of commands




30 feet, limited to line of site.

One-way communication




100 feet, not limited by direction or line of site.


For more information on the history of remote controls in consumer electronics, please see our article on the History of Remotes. (Internal link to first article)
For more information on the technology of signals used for communications I recommend this as a good article: https://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum

For more information on Bluetooth signal technology, I recommend Bluetooth’s website: https://www.bluetooth.com/bluetooth-technology