Channel number display won't turn off

It sounds that the main filter capacitor has bursted out due to over line voltage. Check and replace the main power regulator board. If you wish to get more details, check this site linked below. Pull up older posts there. Check the site with patience, as it has over 2350 posts now. All are related to electronic equipment repair help. If you search the site in Timeslide option, which can be selected from the drop down list at the top left of the display window, it will be easy to locate the related post. You can also do a search by type in the brand name and model number to your device into its search box at the top right of display window.
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Most cable TV systems that use a set top box or converter output on channel 3 or channel 4.

If you have HD cable service however, you probably watch on one of the A/V or HDMI inputs (Video 1, Video 2, etc.). Simply press the Video or A/V input selector, slowly & repeatedly until a picture & sound is seen and heard.

Thanks for working with me to solve your problem. The reason you cannot watch those channels on this TV is because you are using an incorrect connection between the set-top box and the TV. A co-axial cable cannot carry an HD signal.

You will need to connect your set-top box to your TV with one of the following cable types.

1. HDMI
2. Component A/V
3. S-Video with separate audio cables.

You will need to check which sockets you have available on both the set-top box and the TV to determine which cable you should use.

Following this, you may also need to run the channel scan again. They should already be tuned, but currently you are not able to watch them. The correct channel numbers for these stations will depend on your region.

If you have any questions or need any further assistance, please let me know.

Regards,
BElectric

Some hd channels can only be viewed by watching thru a cable box. If you are using a cable box check with your cable provider to see what the issue is.

Press Info " i " or may be Display button on Tv remote, on-screen display will disappear.

Most remote controls have a "display" button. Pressing that is what gets that channel number on the screen. Try pressing it again and the display should turn off. On some brands the display may cycle through various combinations (channel number only, channell and time, etc.) before it goes away, so it may take more than one press of the button.

check the source button, choose PC mode

If the LCD only has coax, it will never display a HD picture quality. However, the Comcast HD Box will still display a picture using the coax connection. So, you could watch any HD channel, but the picture quality will not be high definition.

Any TV hooked up to a cable or satellite box can only "see" one channel...the set-top box (STB) converts the channel you are watching to (usually) Ch. 3 or 4. With cable you can split the input if your TV has 2 RF inputs, with a dish that won't work.

That's why the TV stays on Ch 3 and the STB changes to whatever you want to watch.

Sounds like the PIP feature is causing the problem with the TV if you are connected directly to cable TV without a box inline and getting these issues.