Why would lamp go bad after replacing chip?

Have you checked DLP termistor?

Your repair tech hinted correct. Although the bad connection will likely be in the power supply, it actualy can sit everywhere the power goes. Can be anordinary plug / connector with a little oxidatin, or a dab soldering point. Or perhaps a electrolitic cap, slowely dying.
Let the tech do his job. He has the tools, education and skills to keep your beloved TV alive.

If you put in a generic lamp--this WILL happen. Toshiba sets do NOT like generic lamps. And vapor lamps often do not show physical signs of going bad.

Kelly,

The yellow blinking light generally means that the lamp cover is open. You may have accidentally jarred the lamp while changing the DMD chip, and the lamp safety switch is not engaging. The first thing I would try would be to re-install the lamp and make sure the cover is on correctly. Let us know if that solves the problems. Thanks.

White dot for DLP Projector TV is not because of the light buy. It is caused by aging DLP chip ( DMD Chip.) Your TV DLP Part should be the following image:

Check the post how to place it diy

Hello!
HDMI blocked could mean, that one or more HDMI inputs are turned off. In WD- series DLP TVs it's possible to disable one or more inputs, which are not to be in use, to speed up signal source switching. Most of modern sets are constantly monitoring inputs and automatically recognizing "plug"n"play" signals. blocking any input would not cause TV to shut down.
Yellow(amber) light means: lamp door interlock switch is off or malfunction. green blinking: set is initializing, about to begin normal operation. So: quite possible that lamp has been replaced incorrectly or door is not tight intermittently. Last possible issue: door's interlock switch is bad. Take lamp door off and you will find the switch with blue lever on the left side of the door inside plastic compartment. Push it with your "pinky" or pencil carefully, then ask someone to turn set on. Make sure, yellow light is off, before do so. If set starts normally, observe lamp's activity: it should stay on and getting brighter, while you holding switch. If lamp stops working, while there is no "amber" light, then TV shuts off, red blinks, lamp is bad. I just had to replace lamp twice, due to defective batch of lamps with housing. 3rd time I replaced bare bulb and it solved the problem. But there was no "amber" issue!
good luck,
Alex.

It is the Optical lamp board

Mitsubishi that the one,who u should contact.Talk to them make some kind of deal with them to help u to do a repairing or replace the tv Light Engine Projection Block.That the tv problems,this problems a design flaw on the tv Light Projection Egine Block the IC they put in that causes of this white spots are showing up will continue showing up more and more white dots.It will not stops.

Hi,do you mean tv is showing an amber picture? If you do,it could be an issue with the color wheel or dmd board.The color wheel is a rotating disc that has a gamma of colors it spins at high rpms.The light of the lamp goes through it to create the colors on your tv.When it starts to go bad you will get color distortion ,black and white picture and sometimes you will hear humming noises.This is how the DMD works: http://electronics.howstuffworks.com/dlp1.htm Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens. Here's a video that will help you find where the DMd chip is located : http://www.youtube.com/watch?v=0jr_9A5Xd2Q Have a blessed one!

Make sure you have firmly seated the new Lamp. The next step is to go to the rear of the set and put your ear next to the Lamp Door while turning "ON" the tv with your tv remote.
You should hear a short buzzing sound. That is the Ballast "Exciter" firing up to light the Lamp. If you do not hear this buzzing then you probably have a bad Ballast. Ballast part# is BP47-00037A