An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert who has written 20 answers of more than 400 characters.
An expert who has answered 20 questions.
Re: TV shuts off on it's on after about 20 - 30 minutes...
Freeze like the picture is in pause?
picture freezing is desired function on the remote and handled mainly by the "picture and picture" circuits. but the video that is involved and processed there is handled by many circuits and microprocessors. what you describe is an intermittent heat related problem if you almost can set a watch to the the shut-off time. you can feel, if your a tech, what part is running hot with a finger or start freezing a suspect part with freeze spray and see if stays on long past overdue. make sure your vent holes in the back are not covered and keep the back at least 1/2 foot from the wall.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Vertical 'flipping' is almost unheard of with modern digital video. Are you receiving your signal via the coax antenna or cable input? You might try using a different input method and possibly a different source (DVD player etc.) to see if the problem is consistent. You might also check the refresh rate of the TV and try changing it. If the problem only happens after the TV warms up, you may have a heat related electronic problem with the TV. Try blowing a fan on the TV too see if this delays the problem for 5 minutes or so.... If it's heat related, it will likely be an expensive repair unless it's under warranty.
Please check if the video inputs are working as what is observed by you is that none are working. If so this means there is no signal processing specially Video and the fault seems related in the AV section. You need to use a signal test to confirm from the tuner section, to the IF section and the AV section. Possible the fault seems related to a failure in the AV processor/ logic switch.
If the problem happens using different input and devices, then it is either the terminal circuit (input/output connectors) or the processing unit in main board. The terminals are unlikely the culprit if problem concerns different inputs.
I imagine that the picture is not properly B&W (gray-shades) but some kind of reddish, bluish or greenish picture as the LCD will process picture using RGB (red green blue) channels instead of CYMK (cyan yellow magenta black) like CRT TVs.
Test the TV using an external aerial. You will notice if the channels have the wrong color even from static.
Use different inputs, different cables and different devices. beware of SCART cables, the SCART contacts are very easy to break. A defective cable will loose picture. Better testing using AV cables and component cables. AV cables are red/white for sound and yellow for video. If the two-wired yellow cable does not work, then the TV is faulty. Other test can be done using component cables. Component cables send the three red-green-blue signals on different cables, hence testing is simple. Test swapping cables and see if TV tone stays the same if color tone changes the problem were the cables. Test also using at least two different devices (e.g. one DVD player and one TV receiver or a playstation).
If you find that the TV is defective call the manufacturer at the number listed on manual. If the problem is that one or more RGB channels do not work the TV main controller board must be replaced.
If this happening when TV is viewed then it is possible that the auto shut off is active as no signal is detected by the processor and so is instructing to shut down.
However this fault is related to a problem in the signal detection circuit, if this happens with the auxially circuit- play station- then some logic gate is faulty which needs to process and detect the signal.
Remove power for few hours and see if the fault resets, if not the circuit needs a technical review.
If this is only happening on one input like your cable input and the dvd player is working great on a different input, then the issue can possibly be signal related and not a problem with the tv, if this haapens on any input you are watching, check to see if it affects the menu if it does then your looking at a Logic board issue, if it doesn't affect the menu but happens on multiple inputs then you have to replace the signal board
The TV is in the demo mode. This has nothing to do with the cable signal. If it is a Magnavox set, which is what you have it listed under, then press the volume up and the volume down buttons at the same time.