Mitsubishi WD60735. Had white spots. Later lamp went. Replaced DLP Chip and lamp. Screen lights up very slightly. No sound. Green LED light is steady. Projection lamp is on. What is my problem.

Sounds like it's time for a new lamp.

Have you checked DLP termistor?

There are some adjustments should be done after the DLP chip replacement. If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/

You will need the DLP chip replaced. I do not recommend trying this on your own on a Mitsubishi. You need a technician who has extensive Mitsubishi experience to replace that chip(if it is available for your particular model) If the chip is not available for your particular model, it means replacing the light engine.For that cost I would update to a LCD or LED TV & come out ahead.
If you want an idea what it costs to replace the DLP chip (if avail for your unit) contact a local servicer & see what they can quote you over the phone. Be sure you are sitting down.
Considering the age of your unit I would be looking at an LCD or LED flat screen.

it is your dlp chip i just changed mine make sure it is in tight ther is a video on you tube that is very helpful mine did the same thing with the lines untill i got the dlp chip in tight

Thats a very coomon problem which is caused by a failed DLP chip. The mirrors get stuck and thats what causes the white spots they will keep multiplying untill the entire screen is filled. You will need to replace the DLP chip. You can get the replacement DLP chip and illustrated instructions on how to do the repair from www.tvrepairworld.com

Mitsubishi is replacing these DMD IC chips nationwide under an unannounced kind of recall for model #'s WD60C9, WD73733, WD57734, WDY657, WD73734, WD65735, WD60735, WD65C9, WD73840, WD65833, WD65733, WD73735, WD73833, WD57733, WD65734 and others. Call them @ 800-332-2119 and give them your model, serial # and date of purchase, tell them you have the white spots, they will set up a workorder with a local Mitsubishi servicer to come to your home and replace the DMD chip. Mitsubishi will supply the part (part # 276P595010) for free, but you must pay $200 in labor. BUT...if you ask for Shantell Hebert when you call Mitsubishi, and really push the issue, she will also pay half of the $200 labor fee, so you go from $400 to repair to only $100. Once that chip is replaced, the unit works great again!!

This tv have a design problems with it Light Projection Engine Block.This Light Engine Block have a design flaw with the IC chip the tvs corporations they're putting it in the tvs.This problems happen to many to other tvs compannies too like Samsung,Toshiba,Sony Big Screen DLP tvs too.The whole Light Projection Engine block have to be replaced or change the IC chip.This is a very expensive fix,because the tv Light Projection Engine Block is the brain for the tv.Call them up and talk to them make a deal with them to help u with repair cost.This problems with dots apearing on the DLP tv big screen is not a new problems,have been NEW on the Youtube video site for a few years now.

This unit uses a DLP (digital light processor) chip and if this starts to fail then you will get spots appearing on the screen. The DLP chip will need to be replaced.

Check your lamp; it may have blown. Sound, no picture and a red light are classis signs a lamp has failed.