When ever i turn on the tv it turns on but goes off after about 5 minutes.when i try to turn it on again it repeats thesame process.pls can you tell me what to check to effect the repair?i am a technician. i checked the board and seem not to see anythign wrong.i have done some repairs on some projection tvs through a service like this and it has worked.i believe your information could also be of help.
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Re: tv turns off after about 5 minutes
I looked for that model but it isent in my data banks?? You should try to get a service schematic on the set first. Next look in the power supply and find the power supply main regulator IC. Hook up a meter to the output pin and turn the set on. If the voltage is slightly exceding the value of the IC wait and see what happens . Now right before the set shuts down, does the voltage swing high?? If it does its the IC. It should be a 125 to a 135 volt regulator and if it goes higher then 130 to 140 its bad as I said. If this voltage dosent change then the problem is in the High voltage section. Find the sweep Ic and locate the x-ray protection pin. Monitor the voltage on that and see if the voltage swings high when the set shuts down. I it does your gonna need to check out parts in the horizontal sweep circuit and if you got a scope use it. But remeber always use an isolation transformer when trouble shooting these sets or the meter or scope could blow out the power supply . Good Luck and Be carefull
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When the power light comes on and then goes out, on the front of the set press both the MENU and INPUT buttons at the same time and hold them both in for at least 5 seconds and then release both buttons.
The power light will blink a 2 digit error code and repeat it at least 5 times.
The most common error will be 2 blinks, 2 blinks- a pause and then it will repeat it for a total of at least 5 times.
To get it to repeat this--you have to unplug the set, try to turn it on again and repeat the process.
The error codes are to try to narrow down where the problem is.
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