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Discussion Starter · #1 ·
i have the ln40a550 and i have a weird hum bar issue. It's a hum bar that presents itself over hdmi (that's all I have to test with).


It appears with my dvd player and with my dvi -> hdmi cable from my computer. When I use the dvi cable and hook it into my tv the hum bar is there, when i plug it into my dell monitor it isn't there.


I moved the tv into another room where there is a second hdtv. This second hdtv doesn't have any problems with the hum bar. When I plug my tv into the exact same plugin and use the same cables and place it in the same spot as the other tv, I get the hum bar.


This is my second lv40a550, I returned my other one, and both of them so far have had hum bars. Both made in Oct 08.


Do you think a power conditioner would help here?
 

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Discussion Starter · #2 ·
i hooked up component cable (the one with red green and blue, I think it's component) and it was pretty much gone. I had to turn the backlight to 100%, gamma to 100% and brightness to 75% before it was visible.


what could cause the difference between component and hdmi?


edit: nvm, the tv broken or i have some weird magnetic field. I get the hum bar with no devices connected and I even used a 3 prong to 2 prong adapter to get rid of any grounding issues yet it still was present in the picture menu with no devices connected at all
 

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As you have tried different plugs and devices and you see it even with nothing attached, it may be a problem with that particular run of tvs. You could try a power conditioner, I use the APC LE1200 with good results, but it may that batch of tvs is defective. I wouldn't keep a tv that has issues out of the box.
 
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