Our 4 year old tvs black has turned blue and occasionally shuts off. if you unplug and turn it back in it will work again, but always blue. Sometimes it will play for hours and sometimes only minutes before needing to be unplugged. also the red power indicator flashes. Help!!!
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Re: Black has turned blue and shutting off
That usually means the x-ray protect circuit was triggered. The set is going into protect shutdown for some reason. It may be a
valid trigger to a lame problem or a fault in the detection circuit itself.
I would hang a scope on there and just watch to see if there is a strange movement in voltage values, and if so, troubleshoot it from there.
The blue picture is a result of a convergence problem.
If you don't know much abou TV repair, I would suggest taking it to a Toshiba authorized servicer for proper diagnosis.
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To test magneto leave properly mounted and gapped to the motor. unplug black wire from magneto. Crank motor and test for spark. If you get spark with the wire unplugged then the magneto is fine and your problem is in the wiring system, likely a safety switch. If you have no spark with the wire unplugged then the magneto is bad and needs to be replaced. BTW, the black wire is a ground. That is what shuts the motor off when you turn the key to off or when you get out of the seat, etc. So the motor will not shut off with that wire unplugged. Also, putting any voltage on that wire will immediately damage the coil.
If you leave the tv unplugged for 2 days (atleast) then plug it back in and try to turn it on and if it comes on its the power supply board. If it comes back on it will probably shut off between 30min to 4hrs and you would have to unplug it for 2 days again. All the power needs to drain out of the tv. If thats the case take the back pannel off and check the part number out on the internet. Not hard to do becarefull touching things the power supply does store a little bit or shock in it. Good Luck.
Its either blue tube or bad componet on blue CRT board hertes how to know disconnect Blue CRT board connect to neck of blue tube turn set on see what happens if set come on and plays then this lets you know if it is a problem with tube/video ic on crt board. If set shuts back off different problem.