Model HLT5055WX/XAA. What is causing humming?

There are so many possibilities... If you are SURE that the lamp is good (did you take it out & look at it?) Easiest: When you turn on the tv, do you hear a 'whirring' sound coming from the back? If you do, is it a 'smooth' sound or is it rough, scratch, & noisy?. If it is smooth, or if there is no sound, next place to check is the power supply. If it is rough & noisy, it is a bad color wheel. Unless you REALLY know what you are doing, anything other than a lamp replacement should be left to a professional repair person.

Samuel Morris

Camtek Of NY Inc

I’m happy to help further over the phone at https://www.6ya.com/expert/samuel_de7f55954e381a6f

Sometimes you have to gamble, lamp most likely--at least look at the lamp and make sure the glass pillar in it is not at a angle etc.

Sounds like you have taken all the easy steps, hate to buy a lamp you may or may not need but since wheel is ok the lamp or ballast are most likely.

Yes,the tv have a colors wheel and it is the cause of these problems.Humming noises,motor noises,picture flashes black&white or colors pictures within the pictures.The colors wheel,is dying or already dead.Hire a tv tech. replaced the colors wheel,will solved ur tv problems.

This is a known issue with Samsung DLP sets. Here's a link to the solution:

http://forums.cnet.com/5208-13973_102-0.html?messageID=3162774&tag=emfrnd#3162774

Check this link it might help:
http://www.jangro.com/electronics/samsung-dlp-replace-color-wheel/

If these dots are only seen when the picture is on I would look for the Optical Block to be causing it. Are the dots in the same place each time you turn it on?

Samsung DLP Projection Tv white dots may caused by DLP Chip. Change a new DMD Chip 19106143W. The post show you how to replace it step by step.

Your chip should look like this:

You will have to pull out the light engine. That will consist of 4 or more screws and disconnecting some plugs. The the whole unit slides out where you can get to the fan housing.

Unless you're mechanically inclined, you should not try it as you could damage the assembly.

I don't know the part number off hand and some of those have newer part numbers as replacement for the original. Just do a google search to come up with a part number.

Yes a humming noise on that model is usually related to the color wheel It will get progressively louder

You need a new color wheel. Go to www.samsung.com and do some searches. I had to have someone come out and replace mine.