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I have bought a Samsung TV model LE40A756R1MXXH about two years ago and today I experienced the following problem: After playing for an hour or so the picture starts having these lines and then the TV gets blank. I can still hear the sound and I can change channels but I don't see any picture. What should i do? thanks

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 579 Answers

SOURCE: ESA 42 Plasma picture problem

The power supply is having difficulty. The typical cause is underated electrolytic capacitors. I would examine all the caps (round cylindrical cans) in the power supply and see if any of them are bulged. Not a bad idea to just replace all of them with better rated parts.
These type of caps have all kinds of specs. Not just voltage and capacity, but also temperature, case size, and obtuse stuff like dissipation factor. Most all power supplies use switching type designs that run at serious frequencies (not the old 60 hz - more like 50khz) that stress out these electrolytic caps and many circuit designers (or their cheap bosses) don't specify the better parts. Replace them with the same capacitance, but higher voltage, and higher temp parts (hopefully they will not be too big physically).
Ya, I know you paid $$$ for this TV and they scrimped on cheap parts. Yup, the more expensive a product is, the more pressure the bean counters put on keeping the price down.
Hope Ya Fix It.

Posted on Feb 12, 2008

scott201201
  • 170 Answers

SOURCE: Zenith P42W46X 42 inch EDTV

common problems with these, usually customers here a loud pop. then the screen goes blank. I would try...
Some of these have a 4 pin test on the control board that you can jump with solder to get test pattern. If you get it to do that then these boards maybe good and would replace the control board. if nothing happens, then
the upper & lower drive also the Ysus and Zsus boards all at the same time.
last could be a defective panel.
hope this helps. p/n are on all the boards.

Posted on Jul 22, 2008

  • 1 Answer

SOURCE: plasma TV with vertical lines

Help! My Plasma by Magnavox is putting black verticle lines on the right side of the screen - comes and goes - and I replaced the entire Direct TV-HD unit - wires, everything - and had TV company repair - and it still came back. The TV repair refuses to take TV back because it does not show up when they come. Although I videotaped it and showed them which has the date and time - they still refused to take it - and tried to get me to sign a paper saying it was working while they were there - which of course I refused to sign - so they left and nastily said they will not be back-find someone else. I still have the lines - and do not know what to do! Can anyone help?

Posted on Aug 21, 2008

  • 1121 Answers

SOURCE: Westinghouse SK26H240S - Sound works but no picture?

this is a HV internal circuit broken, need to be repaired.
Please send to repair shop

Posted on Nov 27, 2009

Testimonial: " will do, thank you"

freetek
  • 5568 Answers

SOURCE: horizontal lines on tv

The pixels are scanned and organized in an X-Y matix. One of the control ICs has gone 'thermal' and unfortunately on many (not all) sets these circuits are placed by assembly robots as an integral part of the display panel making it very expensive to replace since the pin spacing is too close for anyone to manually replace them. If you have peered inside anyhow, get a couple cans of 'freeze spray' and try look for ICs attached to the back of the display panel and shoot them individually for a second or two, allow some time for the internal temperature to change before continuing while checking the screen for changes. If you can correct (less likely will it worsen) with the spray, you have the right one or two chips.

Posted on Dec 17, 2009

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