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I have a samsung hlt5075sx/xaa when you turn it own the sounds is not very clear and you hear humming, after a bit of warming up the humming sounds diminishes and the soun get clearer, however the faint humming sound is at all times in the background. Please advice.
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The lamp should get very hot---make sure fans are running.
If you happen to remove the lamp---look at the color wheel that faces it to see if missing any pieces--it will before failure make a high pitched or even fan like sound.
You may have a problem in the light engine or the board often called the DMD which is part of the engine.
Manual says you need to replace the lamp:
When do I need to replace it?
• It should be replaced when the screen becomes darker, less clear or when all three LEDs on the front (STAND BY/TEMP, LAMP, and
TIMER) are flashing
imgadgetman
You can purchase color wheel of Samsung HLT5075SX from Part Store and I would recommend to have qualified TV tech for installation. it is not advised to novice to get involve in such kind of repair that can damage TV.
Still you want to repair it by yourself then download service manual copy of same TV from HERE for small fee that has proper info.
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.
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