Mitsubishi WD-73840 73" 3D Home Cinema HDTV 1080p rear-projection Logo
Marty Rafay Posted on Dec 07, 2015

After about 30-60 minutes TV starts to hum and picture gets distorted, could this be the color wheel...???

The bulb blew up, yes... Changed bulb and TV comes on for about 30-60 minutes then starts to hum and picture gets distorted... Sound like the Color wheel...??? or could it be something else...??? first bulb i tried the distortion started after about 5 minutes...

  • Marty Rafay
    Marty Rafay Jan 12, 2016

    thanks, actually replaced color wheel and that fixed it... Did a lot of cleaning while I was inside which i'm sure helps also... now I need to go back in and adjust the vertical picture... that's going to be fun... any hints to make it easier...???

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Ron Hoffman

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  • Posted on Jan 05, 2016
Ron Hoffman
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Sounds like a sync problem due to color wheel speed. clean and lubricate color wheel motor with tiny amount of Z-Max lubricant (liquid Buckey balls, available at Wal-Mart), on each bearing. make sure wheel is free-wheeling and turns easily. Should cure problem. If the color wheel is in good shape, there is a power supply problem, which may be due to dried out electrolytic capacitors or a regulator that's failing. Troubleshooting or controller board replacement may be needed. Regards.

5 Related Answers

Anonymous

  • 2 Answers
  • Posted on Dec 20, 2007

SOURCE: Distorted picture and multi-color words

You need to resolder the convergence chips. This is a very common issue with this line of TVs.

Hometheaterspot.com's Mitsubishi forum has detailed posts on how to fix this. Just serach for "55809 convergence" and you should find the info you need.

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Anonymous

  • 4402 Answers
  • Posted on Jan 28, 2008

SOURCE: Picture distorted and blurry with color

bad convergence amp ic
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
Sony Convergence
http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/
http://www.techlore.com/article/19631/Sony-Convergence-Procedure/

Anonymous

  • 4402 Answers
  • Posted on Jan 29, 2008

SOURCE: Mitsubishi WD52525 DLP Projection TV

Mitsubishi TV troubleshooting
Here's something that might also be useful. After you turn on the set, and get the regular red blinky lights, hold down the Device and Menu buttons together for about 5 seconds.
The Power light will start to flash in a two digit sequence.
For example, 3 flashes, then 7 flashes = 37.

Here are the error codes, and the corresponding problem:
12 = No error detected, check power supply.
32 = Lamp Cover is open.
33 = Air filter cover is open.
34 = Lamp abnormality
36 = Light Engine (DMD or Lamp Fan stopped)
37 = Exhaust or Lamp Ballast Fan stopped
38 = Lamp Temperature High
39 = DMD Temperature High
41 = Short is detected
44 = DVI cable between FMT and Engine disconnected

Anonymous

  • 10594 Answers
  • Posted on Jul 20, 2008

SOURCE: Mitsubishi tv model WS-55809

wdweber,
Its usualy convergence problem and needs to look dry solder joints in convergence board.

Anonymous

  • 171 Answers
  • Posted on Jul 29, 2010

SOURCE: I have a 46" rear

your problem is most probably in convergence circuit.  very common for this model to have convergence output i.c.'s go bad  also possible that a fused resistor or two has failed.

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