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Hello, it seems like you need to replace the power board on this unit, you can find the part by sending a request to email@example.com, please make sure to include the model#, serial#, and TW#, all located on the back of the unit. You can also ask to have a technician give you a call so he can assist you a bit more on how to go about changing the power board.
Hi, I sent an email regarding the issue to OnCorpus (the company who makes ProScan)
This is what I got back:
--------------------------- Thomas, Follow these steps to correct humming issue: 1. Turn tv on 2. Input mode should be tv 3. Turn volume to zero 4. With remote enter 9 8 7 6 5. A menu will appear on left side 6. Arrow down to backlight and with right arrow key move number from 81 to 83, press menu button twice, 7. Turn up volume and listen if hum is gone.
John firstname.lastname@example.org ---------------------------
I can't confirm if this works at this moment since I don't have access to my TV.
I found that with my Westinghouse SK26H240S lcd tv. that when you turn down the blacklight feature you get a hum thru the audio. so I just turned the blacklight feature to the max and the problem went away, no more audio hum.
I would return the tv for a replacement
it sound as if one of the transformers is arking internally. or you can replace the "Control module" but it is in very short supply