You should use its remote control to adjust this. With panel controls, you can't. 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.
SOURCE: The front panel on my SRT2232S Sylvania TV has
This can be due to moisture build up or dirt accumulating with a static charge to induce voltage and so change the customer control panel switchings.
You can try with a good cleaning of the board and panels. Make sure to dry if moisture is seen. Also check for static conducion of high voltage to the control panel that can induce the inputs to work erratic.
if not check the processor section- processor damage- and the board for a possible weakness.
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