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Sylvania lc420ss8 No Audio On Channels

We've had this TV for a while as it was given to us, there is no remote controller. What happened was the tv was moved and when turned on, only 1 channel had audio while the rest has no audio at all. Nothing was changed to it prior and it was working perfectly fine last night till it was moved sideways for cleaning. We have tried all the methods people suggested online: turn on and off, press and hold the power, press and hold Menu (Setup on the side of the tv), unplug it for X time, unplug HDMI, unplug cable, etc. We CAN'T do the remote controller suggestions due to the fact we don't have one. Does anyone know how to fix this without a controller involved? We checked all settings and sound, reset everything by hitting the Reset Settings in Sound (I believe). There is sound when the HDMI is plugged into the computer, but nothing on all 9 out of 10 channels.

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The Knight

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You need its remote control to fix this problem. If you wish to buy its original remote control, contact the authorized service centre, or authorized dealer to your device brand. They can either give you a genuine remote control to your device, or can direct you, from where can you purchase a suitable one.
To select a proper universal remote control, you should know about the number of digits to its set-up codes. There are 3 digit, 4 digit, 5 digit, 2 digit and even single digit codes, to some brand devices. After confirming this, check the sites linked here. Both the sites have set-up code list and set-up procedure to many popular brand remote controls. Check which brand remote control has set-up code/s to your device brand, and buy that one according to availability? Brand name of the remote control isn't a matter, but it should have set-up codes in its code list, to the device brand you have.
Please note: Every new universal remote control will have set-up code list, and set-up procedure along with its pack. Never accept a remote control, that hasn't both of this. For more details about the set-up codes, visit the site http://electrohelponline.blogspot.com/ Check this site too. http://remotesearch.blogspot.com/ Universal remote controls are available at most of the electronic spare part selling shops; and by Online shopping.

Posted on Jun 27, 2021

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SEARCHING FOR YOUR CODE
If your home entertainment device does not respond to the remote control after trying all of the codes listed for your brand, or if your brand is not listed at all, try searching for your code.
For example, after trying all of the codes for your TV, you still cannot get the remote control to operate your TV, then:
Turn on your TV.
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