Question about Mitsubishi WD-57731 57" Projection HDTV

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Lamp replaced I just replaced the lamp and I don't hear the fan runnung to cool off the lamp. Is it quiter on the new lamp or is there another fan that should be running but isn't?

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Possible side effects of lamp going bad are a deformed lamp exhaust duct. Lamp part # 915P049010, Lamp Exhaust Duct part # 642B155010, and/or Lamp Exhaust Duct Cover part # 642B156010.

Posted on Nov 30, 2007


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Power don't continue

Something is not right, cooling, voltage, Mother board, peripheral. There is an overload or overtemp. Make sure fans and heatsink was properly installed, and PW Supply is putting out correct voltage.

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Replace the lamp-mine just went out also and sony told that I just need to replace the lamp---after a while the lamp indicator light will turn on red if and blink if this is your problem....also note to make sure it is your lamp unplug your tv from the wall or surge protector for atleast a minute or 2 and then replug it back in and see if the lamp light blinks red? If it doesn't then you got something else wrong. I hope this helps...if you need further assistance contact sony online via chat at and they'll help you fix the problem in no time. Take care

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If my lamp is out, would sound be present?

Check lamp cooling fan for dust blockage. It is located inside the back cover (10 screws) and is in a horizontal position above the lamp from the rear side. This is an air intake fan. The cooling fan you can see on the back panel is the exhaust fan that sucks out the hot air. A clue is hot or melt marks around the lamp housing.

If the lamp cooling fan is blocked you'll get red flashing diagnostics light flashing. It's trying to say clean me so I can keep the new lamp cool. Sony is silent on this in it's manuals. I'm guessing they don't care because is causes lot's of parts business!

I learned all this after replacement lamp burnt out after 1 week. My lamp cooling intake fan was found blocked and wasn't spinning. I saw the exhaust fan working and thought all was ok, not even knowing there were more fans. Some models even have another fan inside the optics blocker. I didn't take mine apart that far.

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Projector makes lots of noise

Yes, that can solve the problem because there's also a possibility that the lamp is the one that is causing the noise..

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Panasonic large screen Model # PT-61LCX65

Here is the proceedure to replace the lamp and reset the lamp hours.
Lamp Replacement Procedure:
1. Press the POWER button to turn off the power.
2. Wait for about 1 minute until the cooling fan stops.
The lamp cooling fan will continue to operate for about 1
minute after the power is turned off. Do not unplug the AC
Cord from the outlet until the fan has stopped. Avoid
interrupting the power by using circuit breakers or switchable
power strips.
3. After the cooling fan has stopped, unplug the AC Cord from
the outlet.
Please wait more than one hour before replacing the lamp.
[ Forced cooling function ]
If you need to replace the lamp more urgently:
- The Projection display has a forced cooling feature.
After the POWER button is turned OFF, and during the
first minute of the normal cooling fan operation, press
the VOLUME UP button on the unit and CH UP key on
the remote at the same time for more than 5 seconds.
The cooling fan operates for about 10 minutes. (LAMP
LED will flash 5 times every 5 second and POWER LED
will flash red for 10 minutes.)
4. Remove the Front Cover Unit from the latches.
5. Turn the Knob to the left.
6. Pull the Lamp Cover out.
7. Loosen the Screw on the Lamp. Then, pull the Lamp.
Because the Lamp may still be hot, use caution when
8. Install the new Lamp, and tighten the Screw.
9. Install the Lamp Cover, and turn the Knob to the right.
10. Install the Front Cover Unit.
Lamp Time Reset Procedure:
Be sure to reset the Lamp time to "0" after replacing the new
1. Plug in the AC Cord, and turn on the power by pressing the
POWER button.
2. Press and hold the VOLUME DOWN button on the unit and
the SPLIT key on the remote together for over 5 seconds
in power on condition.
When the reset is finished, the display will indicate that the lamp hrs have been reset to 0 and the LAMP LED goes out.

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3 Answers

Samsung DLP will not turn on

If your having the "3 light" problem it could be an indication of a bad lamp however if there is a buzzing or a grinding sound it could be one of two moving parts. The color wheel or the cooling fan. I would go the cheaper route and replace the color wheel first. The thing is the lamp will not turn on if there is a problem with one of the other two parts. TRUST me ... I've replaced all three parts just to find out it was only the cooling fan. (at least I have another lamp handy when the new one goes out). The motor on the cooling fan is too small for such a big fan so I would definately try it first. It's a big problem with the DLP tvs. Hope this helps.

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