I have a 46'' Samsung LE46C530 purchased in January 2011. The strobing only stopped when the back-light was set to zero. Following the various online guides I removed the back panel, cut jumper 852, reassembled the TV, and had it working like new in 15 minutes!
Samsung would not discuss the problem, told me that cutting the jumper would not work, and gave me a service center number that quoted £150 minimum to repair it!
Simply removed the back panel, locate the pwr suppply bd(pwr cord plugs in to it), now locate the JP854 jumper near upper left hand corner and snip with wire cutter. Put back panel back on and watch TV!
Note: If it still doesn't work, its probably a bad power supply bd.
Please help, cant afford to buy a new tv,
I have an LN55C630 with the flickering problem. I found the real cause and repaired mine (I'm a tv repair guy).
The tv is flickering because the power supply is failing. By cutting that jumper you are just masking the failure.
The problem was the PFC voltage was way too low. It should be 390v, but was only 350v. This will cause other parts of the power supply to run on a lower voltage, forcing them to use more current than designed. Not a good idea.
The failure is due to 390v being divided down by four small surface mount resistors. They are each 1.5 meg ohms and are used in the PFC feedback circuit. As they deteriorate and loose value, they give a false feedback and the voltage drops.
You can remove one or all four and replace them with a 6.0 meg ohm, 1% 1/2 watt resistor and your tv will be back to new.
Hope that helps someone.
If these pics load, they show where the resistors were, but now have a heatshrinked 6.0 meg ohm resistor there instead (actually 2 3.0 megs).
The 390v can be measured where the left end of the resistor is soldered. I only had 348v before the transplant.
Last edited by kdh05; 10-21-2014 at 04:46 PM. Reason: additional info:
There is one seller in the US with a new one on eBay. You can take your chances on a used one but for the price, I'd get the new one. ShopJimmy advertises it but I have never seen them in stock. Ever. You might have luck elsewhere though.
As the flickering is not that bad yet I'll wait with buying a new board and see if someone else knows about the jumper on my board.
If I do need to buy a new board I'll look around in Europe as I live in Netherlands.
If anyone else knows which jumper to cut on a LxxB750 (BN44-00284A) board, please shout!
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