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I have a 52" RCA DLP TV. Model # HD50LPW42YZX. I have a high pitched sound like a table saw running. The picture comes on with the sound. I just replaced the bulb and the color wheel. Now I cannot get the bulb to come on. Any ideas????

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  • bwelder Jan 09, 2009

    This is not a tube TV it is a DLP TV.

  • bwelder Jan 09, 2009

    This is the third bulb that I have changed over four years. I think it is installed correctly.

  • bwelder Jan 09, 2009

    The bulb is installed correctly. The actual sound is coming from the center of the TV.

  • bwelder Jan 09, 2009

    The sound is not coming from the TV speakers it is coming from the dead center, back of the TV. I do not use the TV sound system. I have a surrond sound system.

  • bwelder Jan 09, 2009

    Yes, The fans seem to be doing fine. This sound is loud enough to druve you out of the room. It sounds like a skill saw or table saw running!

  • bwelder Jan 09, 2009

    The sound is related to the light source. It comes on when the bulb turns on and goes off when the light is turned off. It is not speaker related.

  • bwelder Jan 09, 2009

    I reinstalled the old color wheel to be sure it was installed correctly. It is not rubbing anything.

    Now thatI know where the color wheel is located I do not think that it is the problem. The sound is coming from THE CENTER OF THE TV. Not the color wheel area.

  • bwelder Jan 09, 2009

    Does anyone have an answer to this problem?

  • bwelder Jan 09, 2009

    I checked the old bulb and my new bulb. I do not show any continuity between the two bulb connections. Should I?

  • bwelder Jan 09, 2009

    More info on the bulb continunity please!

  • bwelder Jan 09, 2009

    What is the dmd printed circuit board?

  • bwelder Jan 10, 2009

    I have double checked all of the connections and they seem to be right. The bulb still does not start up. Without a picture I do not have the screaching sound. I don't think the problem is actually with the bulb or the color wheel. Whatever was screaching is now finally broken ..... and this does not let the bulb and color wheel start up. Any ideas????

  • bwelder Jan 10, 2009

    The fans don't even start up.

  • bwelder Jan 10, 2009

    ...again, the fans do not start up.

  • bwelder Jan 10, 2009

    The cover is in place and the lamp door is closed. No start-up.

  • bwelder Jan 10, 2009

    the interlock is engaged.

  • bwelder Jan 10, 2009

    Yes, the green light on the front of the TV comes on.

  • bwelder Jan 10, 2009

    I will check the connections again. Did the light engine cause the "skill saw" sound?

  • bwelder Jan 10, 2009

    I just took out what must be the entire light engine including the bulb, lens etc .... in one piece. All cnnections look okay. I reinstalled the unit, connected the large white power supply cable, the small ballast connector, and the two large red wires to the side of the bulb. I installed the TV cover with two screws to hold down the interlock and started things up.



    The TV green light comes on but nothing else. ????? Would you like some spare parts cheep?

  • bwelder Jan 10, 2009

    Yes, I replaced the color wheel and the lamp. From what I see on the internet this particular RCA set is a piece of junk. I think I will go to Costco and get a new set. Do you have any recommendations on a 52" LCD? Are you near Northern California by any chance. You have been helpful. I will "accept" after your next response. Contact me at bwelder@raymndhandling.com if you would like some RCA parts.



    Thanks,





    Bill Welder

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Color wheel is not the only part making high pitched noise on the TV.

If the noise is from the color wheel, lamp may not start up, in that case your original lamp may still be good.

Give the tv to a local technician, with all the parts already purchased and available this may be an easy repair.


Posted on Jan 10, 2009

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The DLP TV (Digital Light Processing) technology, which Texas Instruments developed, to project images. These projectors contain a DLP board that contains a memory chip, a microprocessor, and a specialized optical semiconductor called a DMD (Digital Micromirror Device). The screen on a computer monitor is composed of thousands of pixels, or picture elements; each pixel has red, green, and blue subpixels that, when illuminated, form an image. Something similar occurs in a digital projector. The DMD is only about 1/2-inch wide and contains close to 1 million microscopic mirrors. Each mirror represents a pixel. As the DMD receives data that tells it how bright each pixel should be, it switches the angle of each mirror. The DMD switches its mirrors thousands of times per second, directing each mirror to display the appropriate color and brightness. This would create a monochrome (black and white) image if it weren't for a color filter. The color filter lies between the projector's bulb and the DLP board and directs the correct combination of red, green, and blue light toward the DMD's mirrors, adding color.

Hope it may help;

Regards;
VOTIT

Posted on Jan 10, 2009

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You can listen to solve your problem. Turn on the tv.. you will hear the hum of the fans.. then the colorwheel will spin up (high pitched, you hear it get faster and stabalize) and then the DMD board (engine board) will tell the lamp driver (ballast) to fire up the lamp. If the lamp does not light, you will get a 1 second buzz noise (this is the spark gap firing instead of the lamp). If you hear the spark gap, the lamp is where the problem is. If you don't hear the spark gap, but you hear the colorwheel, then you ballast is the problem. The DMD board controls all this and can be causing the issue, or one of the cables plugged into it may be loose or backward (colorwheel).. The only other cable is a big high power one from the power board to the ballast, this powers the ballast, and in turn the lamp. Tell me what you hear and we can solve together. These RCAs are known for getting defective lamps.. sometimes the connections can be loose causing problems, tighten very carefully! The lamp is very fragile and you can break the lamp or connector very easily. Let me know and we can solve.

Posted on Jan 10, 2009

  • thielectronick
    thielectronick Jan 10, 2009

    You said the fans were fine, now they aren't going. Something must be happening.. The lamp door needs to be closed or this TV will not turn on. If you don't get fans, check power to the tv, check power supply to start, then follow the listen-type troubleshooting. good luck

  • thielectronick
    thielectronick Jan 10, 2009

    If they did start, something happened since then, wire came loose, etc. double check

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Make sure the color wheel was installed correctly because if it was not and it is not spinning at the right rpms then the set will not not fire up. also make sure you have the connector on the dmd pcb connected.

Posted on Jan 09, 2009

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  • Chuck Jan 10, 2009

    it is thick cable that looks like a DVI cable on both ends. If it is not connected then the set will not fire. In fact, checkk all of your connection. They should be pretty straight forward. It has two little silver screws on both ends of it.

  • Chuck Jan 10, 2009

    also make sure the rear cabinet is installed and the lamp door. There is a interlock switch that must be engaged or the set will not fire.

  • Chuck Jan 10, 2009

    nothing will fire up at al if the rear cover is not on the tv or the lamp door is not installed. make sure they are in place. because of the safety interlock switches that they engage

  • Chuck Jan 10, 2009

    does the power light come on??

  • Chuck Jan 10, 2009

    something must be in the wrong with your connections then, it should fire if all is back together, interlock swithces and all. triple check yourself. I just changed an engine on one of those sets today.

  • Chuck Jan 10, 2009

    it is acually the bearing in the color wheel that does it. A new engine has the color wheel in it already.

  • Chuck Jan 10, 2009

    lol. That just doen't make sense? Did you replace the actual color wheel??

  • Chuck Jan 10, 2009

    I like samsung, they are great sets and very easy to repair. I am in Georgia but always wanted to make it to california

  • Chuck Jan 10, 2009

    thanks

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Check the continuity of the bulb ( can do with a multimeter or ohm meter). Also check for any blown fuses around it in the board.

Posted on Jan 09, 2009

  • Karthik P Jan 09, 2009

    Sound may be due to some loose contact.
    How long has this been happening?
    Any burning capacitors you see ?

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I would suggest checking your color wheel to make sure that nothing is contacting and making a friction created noise...

Posted on Jan 09, 2009

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It could be a leakage problem that is getting into the audio amplifier and the sound is coming out from the speakers. Or, it could be the high voltage generator that was disturbed during the move that caused it to create an acoustical output when expanding and contracting during the high voltage generation cycles.

Does the sound go up and down with the volume control or does it remain constant. If it goes up and down, put your ear up to the speakers and verify the sound is coming from the speakers.

If you don't think the sound is coming from the speakers, turn the sound level control to zero and listen to the set and try to determine form whence the sound is coming. If from inside the set, near the back, then it may be the high voltage.

If it is coming from the speakers, here is one idea: If the set has external audio outputs you can use an external amp and speakers and with the tone control turn down the high frequencies to reduce the high pitch sound.

If it is internal, sometimes you can remove the back cover and find the source of the sound and by changing the mounting or even adding some isolation to the source, slow down the transmission of sound. Sometimes a part maybe has worked loose and tightening up the mounting hardware improves the sound.

Good Luck

Posted on Jan 09, 2009

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The Table Saw Sound Could Easily Be Sound interruption Try Turning Everything Off In The House And See If It Still Does It.

Posted on Jan 09, 2009

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How to change the bulb in a   television
http://www.flickr.com/photos/fixyourdlpcom/ just click the link below.

Posted on Jan 09, 2009

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Its quite possible that you have not fitted the bulb properly.

Posted on Jan 09, 2009

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Tube televisions have a flyback transformer and that is usually where the high-pitch sound comes from.

Posted on Jan 09, 2009

  • machadojr_fe Jan 09, 2009

    I apologize i missed that the first time I read the question on DLP tv's the color wheel if not sitted properly can make a high pitched whining noise.

  • machadojr_fe Jan 09, 2009

    It sounds like a bad filter capacitor in the power supply or in the audio
    amplifier. The audio capacitor would cause buzzing even when the tuner is muted.

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There is a cooling fan motor for the bulb, have u checked to see if the noise may be caused by a motor problem like a noisy bearing?

Posted on Jan 09, 2009

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