SAMSUNG 55" LCD SMART TV SERIES 7 FROM 2011 MODEL UN55D7000LFXZA POWER SUPPLY/LED BOARD ARE TOGETHER BN44-00428A
Inmost of the case,the problem is the LED strips.
To check it, the best way is use a LED tester, if you do not have one, you have to disassembly the LCD panel, unplug the cable between the power supply & the main board, apply the AC power to the TV, you will see the defective strips do not light up.
leds are good but screen is still dark at bottom. why isn't the leds shinning through the screen? thanks...thomas
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Go to the menu and see if that has normal brightness, if its dark as well I would look towards power supply that feeds the LED lamps,
SOURCE: I have a samsung hl-r5667w model, when power is
Most likely the powe supply is bad you can get a new power supply from www.tvrepairworld.com call or leave them a email if you dont see it listed.
SOURCE: how do I replace SMART TV SCREEN MODEL NO : LG 55LM7600 55'' 3D 1080p Full HD LED LCD Smart TV
You cannot replace a screen that big. The manufacturers wont ship it to you. IT has to be done by an authorized service center.
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. Surf the site with patience. 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.
SOURCE: When testin a power supply or led board on tv do i test dc or ac with multimeter?
Your power supply board is working if you get audio and imgaes.
You test AC only the AC side of the transformer before the Rectifier Diodes. Everything after the Diodes will be in DC.
did you get to see any spec of backlight as shown in
LCD LED TV Repair No Image Blank Black Screen Flashlight Test How to Fix...
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