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You have tried all the usual resets?
Turn the NOOK off completely.
Hold the Power button and Home (n) buttons. The device will turn on. Continue to hold both buttons until the device shuts off once again (~15-20 seconds).
Turn the device on normally. It will prompt for a factory reset. Press the Home button twice to confirm.
However that said, it sounds like you have a hardware fault, maybe screen connector or screen itself. Not really economically repairable in my opinion
If there is a mechanism fault on the VCR then the VCR will shut itself down. It sounds like the mechanism might be jammed, it's trying to move to the right position, when power is applied but can't so it stops. One thing that might be wrong is the mode switch might be faulty. This will cause all sorts of thing to happen, including putting on the timer record light even when none has been set.
It seems that your unit has some sort of Thermal PSU fault, or a problem that is shutting down the Power Supply Unit, PSU. This happens so that no further damage, and possible fire will occur. After it shuts down and the faulty component(s) cool down, it restarts again until it once again goes critical and shuts down again only to repeat the cyle.
You need to take the unit to a reputable service centre/man and ask for a firm "Quote" for the work to be done.
This is an option for the TomTom. If you enter the Options, there should be something about Power Save features. In there, you will see options to shut off the screen, and you can have it do so after a certain time, once a certain speed is reached etc. Just change the time in which it turns itself off to never and you're fixed.
Hi This is due to Strip Problem...If the Strip life expires it will create issues like Display goes White and it turns Off itself...It may show Lines on the screen..Keys may not work proper. Its completely Hardware issue. you have to change Strip of the Cellphone.
Check your CRT boards on the end of the tubes for burn spots, and burnt components, check the resistors to make sure they are not shorted, burnt, and they read the correct resistance. Check the diodes to make sure they conduct in one direction only and are not shorted or open.
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