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I have a LG plasma Md# 42PC3D-ud, my screen is getting darker at times. Also loosing color. any sugestions

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The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. ..

Posted on Dec 30, 2016

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Posted on Jan 02, 2017

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Why is the picture on my LG TV so dim?


Sounds like the back light panel is going bad.

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LG 42PC3D-UD plasma tv takes 22 minutes to turn on


the more i think about it, replace your power supply first. they have been known to cause this problem you are having

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