Pioneer SDM1407 Rear Projection Monitor System (TV) 42"

Hi,

You have to get in the Audio Menu and tell the TV "What You Want". Things are now set-up to operate with an external sound system. You have to set things back to Normal or Default.

It can be a couple things. Something bad on the power board. Or the vertical output circuit. How long ago did you purchase the television. Your best course of action is to have it serviced.
If you need any information or other assistance let me know.
Thanks,
Lee

Sounds like the bulb popped up... does it smells like there something that burned? any error light?

Have someone remove the power supply board and resolder it; almost all of these sets had problems with soldering.

The high pitched sound is shutdown or a voltage missing will give the same symptom.

I have seen over 80 of these sets where soldering the power board restored the set to normal operation.

Let me know by commenting here and I will assist you.

If this told you something you did not know, rate this solution as very helpful as I do this here for free.

REGARDS, SD TECH

It is most likely the power supply. Do not try to fix this yourself. There are LETHAL voltages inside such a TV, which can persist for WEEKS after it has been turned off.

Sounds like a bad capacitor or two in the power section. Do you hear a hissing sound also?

I had the same problem, try running the TV on Mute, if it is a bad solder joint the sound can vibrate the solder point and trip the relay, if the TV doesn't trip off with the sound on mute then it is probably the big power transformer's solder connection needs resoldered. sound vibration from those big pioneer speakers may loosen the solder joint over a period of time because the transformer is heavier and bulky and vibrates a lot.

Rear projection hdtv, most likely damaged tubes. Don't repair this by your self get a tv repair man to do it before you injure your self.

as far as it turning off on its own I would get a fan on it and see if that make a difference make sure that the fan is able to flow around the tv especially through the back of it, if this stops it from turning off then it is an overheating problem

need mor info the tv when turn on after 15 or 30 minuts works fine ?