I have a 5 years old Panasonic PT-47WX49E. It turns itself off immediately within 2-3 seconds of turning it on then it will not turn on unless you unplug the power cord and then try it again. It will do the same thing again. It seems like the TV's circuity is detecting something wrong and turns itself off. Does anyone know what the problem is or where the problem could be? I have a electronic background but never fixed any tv.
Also, if anyone have the schematic for this TV I would appreciated if someone could send it to me.
I was given a 42 in panasonic because it had this problem. I took it home and plugged it in and pushed the power on button. before it could come completely on I pushed the power off button. I did this 3 times and then turned it on and TV worked fine. This made my friend sick since he just bought a new one. I offered it back but he said keep it. :)
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This is for sure a safety shutdown circuit that is shutting down this TV set. It is a hard call to pinpoint a problem such as this without first doing some troubleshooting on the TV set. You could have a short in the sweep power supply, the horizontal output transistor could be bad, therefore then the flyback is probably bad, or the vertical IC could be bad, there could be a regulator problem in the main power supply that could be bad, and also the convergence IC's can cause this problem. Almost any circuit inside this TV set can be detected and staop the set from starting up. Good Luck
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The repair tech is wanting to take alot of your money, you can get the entire deflection baord which has the flyback on it remanufactured for about half of what he wanys to change the flyback. Heres alink leave them a email with your model number they will send you a quote to have your deflection D board rebuilt which carrys a full warranty. heres the link. http://servicemanuals.vstore.ca/
Thats a power supply module going bad. Dont use it until a person with knowledge on TV see that. Or if you feel you can DIY open the back panel to see if there is a toasted or foreign object near the power supply area. Its located when you follow the main plug going into the back panel of your TV. Look for a dying Fuse too. And watch out for Capacitor that has still current, you may electicuted with that component. That parts its only for qualified servicemen area only.