20 Most Recent Mitsubishi WD-73733 73" HDTV Questions & Answers

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Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
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most definately
it is used to get a secure connection and eliminate all air pockets between the chip and the heat sink and with out it the chip will over heat and fail

Sounds like a misalignment problem. the lens has a specific optical plane the DLP chip must be positioned at in order to provide the proper focus on the screen. Try repositioning the board or adjusting the lens to clear up the fuzzy picture. Regards.

It sounds like either the controller is bad or the color wheel or scanning sync encoder is dirty or defective. One thing to try is to reset the controller program by unplugging the TV, wait two minutes, then power it ON. The micro-controller will reload it's program from flash memory (which takes several minutes). When the lights are all OFF, turn the set ON and see if the picture is correct. If you select the menu and the picture of the menu is stable, then the problem may be in the signal coming into the TV. Regards.

mirror tunnel has faded the mirrors need replacement then replace the lamp u need a new one

If I'm not mistaking I believe Mitsubishi shows the yellow light to indicate new bulbs needed and or overheating. Most common is overheat, but may actually be a bulb replacement required.

http://www.mitsubishi-tv.com/pdf/ownersguides/WD-73733.pdf

That is the manual for your TV

liquid is never good on those screens-
there are 3 layers to the screen, from inside out, a fresnel screen (etched circle pattern), a lenticular screen (ridge lines top to bottom), and a protective screen ( "Diamond Shield" tinted plexiglass).

the fluid will wick up btween these layers, turn black, then very very slowly recede leaving a waterline mark. It can take months for it to become un-noticeable.

cleaning is possible, but beware, any type of cleaning fluid or spray is going to simulate the exact same problem but to a larger area.
also introducing dust, lint or hair into the layers when separated is almost impossible to avoid.

these pieces, especially the lenticular screen are extremely fragile nylon plastic and is apt to split under its own weight when handling, so beware the project you are about to get involved in...considering the large size.

but it can be done.
Remove all screws around the screen frame from the back of TV and the lower sides. There will be a wiring harness that goes to front buttons- disconnect it. The whole assembly will come off the front of the TV.
Lay it on the floor face down. Remove the screws in around the inside of the screen. The screens are now ready to lift out, one at a time.
IT IS IMPORTANT to not attempt this by yourself. The screen are fragile and large and scratch so easily which appear as a white opaque area when reassembled. Have a helper. Wear cotton gloves while handling as finger prints will be noticeable after you reassemble.
ALSO IMPORTANT- these screen are oriented front and back...in other words they go together in a certain direction...on each screen layer there is a small sticker on its outer edge. Make note of its orientation and reassemble accordingly.
Clean with a cotton cloth and very very little "plastic glass gleaner" (if needed only!).
WIPE EXTREMELY GENTLY in the direction of the grooves on each screen layer- much like cleaning an old vinyl record.
The lenticular screen is the biggest worry as rubbing on the grooved side is so likely to cause damage. Perhaps rubbing should be avoided if possible.
Let them lay out and dry before reassembling. A bottle of compressed air is good to remove debris when layering them back together...a dust free environment is recommended.
Reassembly and installation is just the reverse of dis assembly- remember the wiring harness connector!

On your original TV remote look for button that says Picture size, Format or Ratio and press it till you see the normal size.

It is most likely that your light engine has gone out. When this happened to mine that was the part the service technician changed.
http://www.tvserviceparts.com/WD73733.html

Check the lamp

I have had a similar problem and it has always been the bulb. If that doesn't fix it, then the ballast. Most likely your bulb is on the way out.

Even though the Lamp looks good it does not mean that it is. The only way to know is to relace it. If you have already replaced it with a Mitsubishi Lamp Assy. then the Ballast board would probably be the cause.
Hope this helps,
Skyassoc

Could be bad conections, I gues. I have downloaded the service manual of: http://www.audiolabga.com/pdf/V36-V37-V38_Service_Manual.pdf In manual you can find more information about the problem. Luck! http://www.audiolabga.com/pdf/V36-V37-V38_Service_Manual.pdf