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Samsung LNT4042HX/XAC the set refuses to switch on, wheter you use remote or set button. It you are lucky it may start clicking and does it for 30 min and it is getting longer. I need expert help!

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What has happened: a big part of the tv has failed - usually in this model is the T-Con board - and that part has started to act like a short, drawing huge amounts of current and preventing the rest of the tv's components to function correctly. This in turn has triggered the protection system of the power source which has forced it to shut down. If, despite the obvious bad state of the tv, you have attempted to start it the protection system gets reseted and disabled - this allows the power source to start functioning; that in turn causes the T-Con board to get powered and it absorbs so much current that the voltage drops so low that the power source can't operate no more so it just shuts down; that cuts the power to the T-Con board and the current to it drops = the voltage starts to raise = the power source starts to work again and the cycle begins again - this is the clicking you hear. Eventually the protection system kicks in and the power source is shut down for good.
This abnormal functioning massively overstressed the still functioning parts of the tv - every time you have tried to start it the damage got bigger and the protection system had a harder job to activate and protect the tv. Stop doing that, in fact unplug the tv from the wall immediately.
To identify the faulty board with certainty the tv must be opened and the voltages on the power source checked - the one that is close to 0 will point to it. This is a very skilled job that should be left to someone with experience. Call a repairman and be prepared to pay around $600.

Posted on Nov 02, 2010

  • Jason Chapman Oct 29, 2012

    The above post isn't true.On the power board you have small capacitors, about 4 in total need to be changed, I took my power board off and went to a local repair guy who soldered new capacitors on for 20 bucks, I did purchase them from radio shack though for 2 bucks each :D



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I own a Samsung LN40C630K1FXZA TV with no picture but has audio and backlights. I need help determining what boards to replace. I tried to watch some tutorials posted on YouTube and have the following information. check picture settings or input or source The TV was starting to have an issue that while watching it the picture was seeming to get a little jerky like it wasn't refreshing fast enough. It wasn't always noticeable and I initially though it may have been a signal issue with our cable. Eventually we turned on the TV one morning, the picture came on and then disappeared after 2 or 3 seconds but we still had audio. I tried to pull up the menu screen and that was not visible. I performed the flashlight test and there are images visible with the light. I removed the back cover and took pictures of the attached boards and also saw that the backlights seemed to be working but did seem like they were not quite a constant consistantly light. They never completely extinguish but do seem to fluctuate in brightness slightly. I did not see any visible issues with any if the capacitors being swollen or blown and did not see any apparent burnt components or boards. Below are the readings I got from one board but I was not sure where to get the readings on the TCON board. Main PBA readings CN201 1. 18v. Actual 13.1v 2. Sw. Power Actual 13.1v 3. 18v. Actual 13.1v 4. 5v. Actual. Falling to -1.6mv 5. 5v actual. Falling to -1.7mv 6. 5v actual 5.15v 7. 5v. Actual 5.15v 8. ground actual 13.1v 9. Ground actual 13.1v Any help would be greatly appreciated so I can buy the right parts from you. Thanks, Chris

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