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Check and replace its tuner. It is faulty. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Sometimes, TVs will switch to a new input when they sense a new signal on the new input. So if you're watching TV and someone turns on the AV device (or makes a change that alters or starts a video signal), the TV may switch over to that signal. This is a function of the TV. Some TVs allow you to disable this function, others do not. I looked in the manual and didn't notice where this could be enabled or disabled. If you want to only watch one source, make sure the other sources are turned off.
You need to find out what the native resolution of the TV is when it is used for PC monitor, then set the screen resolution on the laptop to that resolution BEFORE hooking it up to the TV, turn off the PC attach the TV to the VGA port on your PC, turn on the TV and set it to PC, it will display no signal and then go into standby, turn on the PC and now you should see the computer signal on the screen, you can use HOTKEY function to toggle the displays between the PC and TV.
You need to set the TV to input from the source that the computer is connected to.
You also need to make sure the computer is set to output a signal to it's S-video or video out port (usually Fn F5 or something like that, or there may be an software switch in your desk tray where it is to be tripped.)
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