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REPLY tv is a little over a year. just out of warranty of course! how do you change backlight ?

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The backlight isn't user-serviceable. The inverter might be, but I can't find any parts based on your model number. Are you sure you entered it correctly here? "ln3238d"?

Posted on Jun 03, 2008

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Samsung LED tv horizontal lines


Your lcd screen itself or the led-backlight matrix of your lcd screen have this problem ( if there was not worked insite the house or room with wallpaper chipping or new wallpaper?), the answer is to get warranty if it is within the warranty-time in most cases its happens by over 4 a 5 years old SAMSUNG (led backlight matrix) lcd tv's ?? or younger have no heard of this problems by the older lcd ccfl lamp backlight devices.
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Check its main supply regulator board [SMPS], and measure the voltage that comes to the back-light inverter board is present or not. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Circuit diagrams of SMPS section of many popular brand devices are given. 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.

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I have a 42 in magnavox 43mf439b/f7 tv. It is about 2 years old. i have no picture but i have sound. if i change channels the sound changes. I did a little research and i believe that i have...


You were smart to test the image for burned out backlights! :)
Typically, on a screen this size, the backlight inverter is the first place to look.
I found the part number...
27-D026774 Funai TV Module, backlight inverter, PNF10092, I420H1-16A0, 42MF439BF7

You can by it here...

http://www.tristatemodule.com/p-13231-27-d026774-funai-tv-module-backlight-inverter-pnf10092-i420h1-16a0-42mf439bf7.aspx

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1 Answer

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Had this problem as well. Ran through a laundry list of possible solutions. Finally found that the key is to increase the backlight (Access via [Menu] [Picture] ) to 100% and the noise goes away. If this is bad for the life of the backlight, just pray the backlight burns out inside year 1 while the warranty is still valid!

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Your not alone with this problem.
I had to fix mine. The warranty is less than impressive.
The trouble is going to be the Power Supply/Backlight Inverter board.
This is the picture of yours:
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Fixing the board like I did seem to be the only option. If you need info on fixing it, let me know.

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1 Answer

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Jerry G.

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