Question about Pioneer Projection Televisions

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I have a Pioneer Elite PRO-940 - problem exists when the tv is powered off - a component (might be a power supply or transformer) kicks on within a second or two after being turned off - emits a low humming sound - doesn't seem to affect any operation...any advice?

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  • dagreen Jul 16, 2008

    I have no audio or video components attached to this TV other than HD cable box; the only cables useed are a cable coax and a HDMI cable; the TV is hung from a std wall mount; it appears that the hum is coming from the TV speaker, again, immediatley after the TV is powered OFF???

  • dagreen Jul 16, 2008

    I tried turning the TV off with the remote and the ON/Off button - no change, as I still hear the humming noise. BTW, the power cord from the TV is plugged into a 900 joule surge protector...fyi...I've even tried plugging direct into outlet (bypassing the surge protector)...no change...

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When you shut off the set, most of the set is off, there is a portion that runs continuously. This is what allows you to use a remote to turn it on. Normally, the only active circuit is the CPU and the InfraRed receiver. Once the IR receives a power on from the remote, the CPU turns on the remainder of the set. It sounds like the audio amp section is not completely shutting down quickly enough. I am assuming that the hum stops after a period of time. This can be because of a defective bleeder resistor that normally drains the power supply voltage once the set is turned off. This is not harmful, just annoying. If the hum remains on without stopping, then that is another issue. I'll try to get the service lit on this to get you the probable part.

Keep me posted.

Dan

Posted on Jul 16, 2008

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It could be picking up AC noise from the ground on the electric socket, caused by your air conditioner, fridgerator, etc.. Try plugging in the TV to a different electric plug, or buy a special surge strip that eliminates dirty AC power. Like this one made by APC. Monster also makes one but is a lot more expensive.

Posted on Jul 16, 2008

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Try to turn it off first using the remote, then press the power button on the TV... it is better to use a surge protector or an outlet with a transformer, thatg can regulate the power that connect to the tv..

let me know

Posted on Jul 16, 2008

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Hi-
Do you have a receiver attached to your devices? make sure that components are as well of since its creating a background noise on some devices, check the cables as well.

Thanks for using fixya, keep us posted for any progress.

Posted on Jul 16, 2008

  • Edgar Allan Pagayona
    Edgar Allan Pagayona Jul 16, 2008

    Hi-

    any other devices that are near the television? have you tried unplugging power cable and replugging it on a different power surge? try that as well and keep away other devices that interferes or that may cause humming sound. thanks!



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