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There is a "reliability kit" sold for these which consists of 8 electrolytic capacitors for the power supply that may cure the problem. Other times more extensive damage to the switch mode power supply needs additional parts You can try replacing the 4 470Uf/ 35v and the 4 470Uf/ 25v caps.
Press both the volume buttons at the same time and it should exit demo mode. I do not have the tellie but found it on the internet so please if it works leave feedback if it doesnot please let me know and i will keep searching for you
If you can find the model number (probably located on the back of the TV) you can go to the magnavox website at www.support.magnavox.com and search for your model number. They have troubleshooting tips and tricks for a lot of common problems. You may need to speak with a representative directly to help solve your specific problem. After you find your model on the website, you can download the user manual from the left panel, which may help as well.
Wondering if this is what your asking about, I cant find reference to Cable only mode...
- Line 7 : “CHANNEL BLOCKED”
Indicates that all channels are locked except the selected channel.
The following complaints may be generated due to locked channels:
- TV cannot be switched on from standby with the local keyboard buttons.
- “CH+” and “CH-“ buttons on local keyboard do not function.
To disable the LOCK feature:
Select ”FEATURE” menu (with the Remote Control).
Select “LOCK” (with the Remote Control).
Set to “OFF”