Question about Samsung LE40R74BDX 40 in. LCD Television
LE40R88BD LCD TV screen flickering, started out with power off/on and clicking
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Posted on Jan 02, 2017
SOURCE: screen problem
call samsung...had the same problem with my HP-R5072...and they cant seem to fix it !!!! ... If your lucky you should get a replacement TV within 2 to 4 weeks ... :(
Posted on Jan 30, 2008
SOURCE: Gateway Flat Screen FPD1830
My Samsung 215TW started flickering like a strobe light when I would turn it on... then after a while, the speed of the flashing would change, and eventually, it would go out. After turning the unit on/off several times, I could get it to stay on, but after a while, it would start to get odd video noise (strange colors appearing on the screen), and then it finally quit.
Once the monitor went dead, I noticed that I could still see the image on the screen, albeit very dark, so I took my desk lamp, and placed it next to the screen, and I could see that the monitor was still active, meaning that there was an actual image on the screen, it was just that the fluorescent lamp that lights the screen was not staying lit.
I got tired of waiting for Samsung's customer service (thats a story all within itself), so I took the monitor apart in search for the problem (I am an electrical engineer and electronics specialist). I saw that there were two circuit boards, one being the power supply board, and the other being the video signal board. Knowing that there was still a video signal present, I focused on the power supply board, as it contains the transformers to ramp the voltage up to the necessary voltage to light the lamps.
I instantly noticed that several of the radial electrolytic capacitors on the board were bulging and looked like they had swollen and then blown. There are 5 caps on my monitor that needed to be replaced: (1x) 47uF/50V, (2x) 820uF/25V, (2x) 330uF/25V.
The 47uF and 820uF caps are on the power supply side of the lamp power circuit, and the 330uF caps feed the control signal into the IC chips that control the ballast of the lamps themselves, one for the upper lamp, the other for the lower lamp.
Once I replaced these units, my monitor started functioning correctly, and I dont have to give Samsung my absolute most favorite monitor ever for a refurb unit that most likely will have 15 dead pixels on it (mine has ZERO).
Posted on Dec 08, 2008
SOURCE: The tv will not turn on.
hi right now samsung is the best tv maker out right these problem dont happen with samsung what would be good to do is call them and let them know your problem cause you have a year protection on it thats if it less than a year
Posted on Jan 10, 2009
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