Samsung ln52a750r1fxza power supply

Bad capacitors in the power supply are causing this, they warm up some and start filtering.

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buy new tv may be cheaper in long run

Replace the motherboard. It's more problematic trying to fix the motherboard than replacing it.

Had a similar issue with my set LNT 4061FX/XAA. After doing some research on line I found that Samsung company had an issue with some capacitors. There is a group action law suit. I found that my set was included. Called Samsung and they were extremely nice and helpful. They called a local repair shop, gave them a invoice charge #, and the repair shop ordered parts needed for me. I took TV to them (althought I was offered home repair), and my TV was fixed for "FREE"!!! Got it back and working better than it had in years!!!!! Thank you Samsung!!!!

I would suspect faulty power supply capacitors, check for any with bulging tops.

If it's all colors (Red, Blue, Green) doing the same thing at the same time, there are (unfortunately) multiple possibilities:

1) the AC to DC power supplies
2) the LED Driver Board
3) DLP driver, or DLP itself

The most likely problem is the DC-DC power supplies, which are known to have capacitors that go bad after several years of operation.

Due to this, there are many sources for either re-capacitor kits (DIY), or rebuilt power supplies with upgraded capacitors.

WARNING - Dangerous, and even lethal voltages are present inside your TV set. Do not attempt this unless you are trained in these kinds of repairs. Leave the TV unplugged for several hours (or preferably a full day) before attempting such.

DIAGNOSIS for bad capacitors: If you inspect the large capacitors on the power supply boards, and they are not totally FLAT across the top surface (if bulged at all), then you need a new power supply or new cap's. Likewise, if there is any leakage from the capacitors (usually a light-yellowish crusty appearing substance), they are BAD.

Sub-power supply:
BP96-01726B ASSY PCB P-SMPS Aquamarin,LED DLP TV,DC2

Main power supply:
BP44-01001A SMPS-DLP TV PN082DPS-VF(A),AC/DC,90V-132

A quick Google search for these part number (BP96-01726B & BP44-01001A) will reveal many sources, and pictures to verify it's what your set has.

Sounds like a bad main board, but you will need to have the set diagnosed to make sure.

U have all the tools and understanding basic electronic and also can do basic soldering?Yes.The tv power supply board,that the board,where the power a/c cord plug into it.Check the whole tv power supply board carefully for dying capacitors components parts.It is usally have bulges or puffing up capacitors parts indication of components capacitors parts are dying and needed replacement.Replacement for those new capacitors component parts with the same Micro ferit and the voltages of those new components capacitors parts in a higher voltages like 5 or 10 voltages higher than the old components capacitors parts u are replacing for a better heat resistance for the tv operation of the tv power supply board for later on tv use.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.