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Re: Set turns off
The first thing that springs to mind is the "Sleep Timer" is active.. ON, it needs to be set to OFF, have a look in ya manual regarding ya Sleep Timer setting.. That may indeed be ya problem.
If that ain't it.. then ya got some sort of "Protection" circuitry coming into play it sounds like...& OR a Component starting to fail when it heats up. With these latter ones, it is gonna be a job for the "Shop". If it is, ensure ya get a firm "Quote" and an explanation of what was done etc.
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HI. If you are 100% sure that no timer is active, then I guess it is a thermal problem in the TV. There can be bad solderings, mostly in the horiz., or vertical powerstages, causing the TV to shut down after 5 hours. At least, this time should be different if the ambient t° from the set is higher or lower. If the "turn off" time is always exactly 300 minutes, no second more or less, then there might still be a processor problem in the TV. Not easy to find. Also, these replacement micro-processors contain a
pre-programmed booting section where all characteristics and alignment data from your set are stored as a factory setting....
Huge problem, which can only be solved by an Audiosonic service center. Good luck.
There is some shorted component/s on the main power supply regulator baord to your TV. Work with main power board circuit is fatal to any inexperienced person, as 80% of the components at this stage will be Hot [electrically], when the set is switched ON. Without switch it ON, you cant check the voltages at this section. S, if you are not experienced to do this work, contact any experienced service technician to get this set repaired.
I had the same problem with the same model. On my set the channel up switch on the front of the set was faulty. I suspect the same symptoms would occur should any of the front of set control switches fail in the same way. I measured the switch with a digital multimeter and found the switch would not open circuit and would roam around 2 to 10 Ohms due to a build up within the switch itself. If you simply disconnect the switch and use the remote control you should be back in business. I repaired my switch by opening it and cleaning and re-assembling. Not sure of the availability of replacements.
Our set turns itself off by itself. Prior to this happening, it goes to a green screen. It usually happens after the set has been on for a couple of hours. We bought the set in April, 2004 and the warrantly has now expired. The longer we keep the set on, the more it turns itself off. Is this a tuner, on/off problem or the tube? Any estimates for repair?
If you mean that it happened once, then someone hit the INPUT button by mistake, either on the set itself or on the remote. Pressing the INPUT button will cycle through the tuner (A and B) and through all video inputs. Simply keep hitting the INPUT button until the set is back where it was before.