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If the old lamp still works, I would try it and check results... it may be dim, but if the dark bar is gone then the new lamp (or the lamp housing) is either defective or misaligned. On the Mitsu WD65736 there are two options for lamp replacement, either (1) you can just replace the lamp itself or (2) for just a few dollars more you can obtain a complete lamp cartridge (module) with the lamp already installed. I recommend the latter method because you must not *ever* touch the lamp bulb with your bare fingers, as to do so will significantly shorten the life of the new lamp.
Also try pulling out the lamp module and inspect it as well as where it plugs in on the back of the TV.
Why did you change the chip? If you got the replacement chip the legal way (direct from Mitsubishi parts) I would get on the phone with them. Mitsu generally won't send out a replacement flash chip unless you open a repair ticket with them for a known/documented problem for which they have a patch. Note well that they will otherwise *NOT* give you the latest firmware without a reason. Simply wanting to have the latest & greatest is not considered a valid reason. On the other hand, if someone shared their flash ram with you and you burned your own chip, then you are on your own. Just the act of inserting the new chip will cause it to download the new image from the chip and then automatically erase the chip Hopefully you backed up your original flash chip and can go back to the original firmware. FWIW, the **only** Mitsu firmware patch I'm aware of for this particular model had something to do with being unable to pair it with a cable card.
If all else fails, there is a very extensive (thousands of posts) on AVSFORUM dot com for the Mitsubishi WD series. Search for your model. One of the posters there even did a full documentation along with pictures showing how to disassemble & clean the lense assy. Don't bother asking for firmware there as it is a violation of avs forum board ethics for any member to post links to or share copyrighted firmware. Good luck!!!
First of all, check the lamp to make sure it is properly installed or replaced if it is getting old or needing replaced according to the lamp indicators on the front panel.
There are two possible causes of the blue dots; 1) a normal condition of the projection system and the display panel. Please see page 6 of the owners manual for an explanation of this phenomenon. If you have not retained the manual you can download it freely from the Internet. 2) the second possible cause is a defective projection engine or apparatus that drives the projection lamp. This is very serious and expensive and requires the replacement of the engine. If you google around and read some of the forums on this models blob problem you will find that some owners were able to convince Sony to replace the defective parts free of charge; however, I think the age of this model is well past the free repair time period and I don't think the Sony offer is still valid. In the worst case the repair is very expensive and it means the repair is not a viable investment and a new replacement set is the best alternative. Sorry for the potentially bad news. Hope this helps.
Check is the lamp is properlyinstalled or not. If the tv was at working condition before replacing the lamp then then the new lamp is not properly installed. Check one more time. If you can then just remove the new lamp and insert it again. Make sure that the lamp is properly attached. And then check.
Chances are the lamp is not bad. Is the lamp door reseated properly? The is an interlock on that door that must be activated in order for the set to turn on. If the unit was woking before the lamp went out this may be the problem