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Chances are you have a stuck button on the button cluster, what I'd do is remove the connector going to it and use the remote control, with a stuck button the remote won't function properly.
If you do not have the remote control for your Sanyo DP50747 TV, you can try using the buttons on the TV itself to set it up. Here are the steps to follow:
Locate the power button on the TV. This is usually a round button with the power symbol (a circle with a line through it) or a triangle with a line through it. Press the power button to turn on the TV.
Locate the input button on the TV. This is usually a square button with the input symbol (a rectangle with an arrow pointing into it) or a button labeled "Input" or "Source". Press the input button to cycle through the available input options (e.g. HDMI, AV, etc.).
Once you have selected the appropriate input, you should see the setup screen for your TV. Use the arrow buttons on the TV to navigate through the menus and select the options you want to change (e.g. language, time zone, etc.).
To save your changes, look for a button labeled "Menu" or "Options" on the TV and press it. This will bring up the main menu, where you can select the "Save" or "OK" option to save your changes.
Note: If you are unable to navigate through the menus using the buttons on the TV, you may need to use a universal remote control or purchase a replacement remote for your TV.
I don't know but it probably isn't much different to most other tv/remote combinations where commands are given by the remote and carried out by the brain in the tv.
Start by pressing the Menu button and the main menu should appear onscreen and from there use the up, down, left and right buttons to navigate the main menu and the select button to select sub-menus and items from the menu(s) until you reach the section on channel search, installation, etc.
Press the helpful button and check link below for various models
First power off your TV using the remote, then press following buttons quickly on your TV remote: Display (or i+) + 5 + Volume Up + Power
It'll show the hidden service menu on your TV screen.
Once you enter into service menu, you can press Menu (or Options) button again on your remote to switch between various service modes such as Digital, Chassis and VPC.
To navigate between available options press 1 or 4 buttons. To change or modify their values press 3 or 6 buttons.
To save your changes, just press Mute + 0 (or Enter) buttons on the remote.
To restore settings to factory defaults, press 8 + 0 (or Enter) buttons. PS: For some new models the above mentioned method might not work. You can try following key sequence to access service menu in those new models:
While TV is on, press Left + Right + Mute + Center button + Mute + Menu buttons.
check to make sure you have power to unit. If you do you may have a internal power problem. Have you gone thru a recent lighting storm? If so see your home insurance co. For coverage to repair or replace unit.
keep searching for another code as some tv's share the freq code of others just because the tv responds to off/on vol chann up/down its not to say its the correct code keep serching through the codes untill all buttons work and try all the buttons some times although the button could be for somthing like teletext it will bring up the menu
First, change the batteries on the remote with e new set of batteries. Check to see if you can bring up the menu using the buttons on the TV itself. Let me know what happens
on some models the menu button is on the front disguised as the volume up/down or channel up/down buttons. you have to push both up/down buttons on either one of these to bring up the menu.
alot of universal remotes dont let you program your tv with them due to how much more mem they would need. you have to use your actual tv remote or do it manually with the tv. sorry
press play and stop together and that acts as the "action" button and brings you into the menu screen. you have to press those 2 buttons again to select what function to preform. volume +/- and channel +/- act as a cursor for moving around in the menus
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