Samsung model LNS4051DX/XAA won't turn on, just clicks
My LCD turned itself off for mo apparent reason and will not turn back on; all it does is make a click sound and the power light blinks four times then repeats the cycle again. I have spoke to a tv technician and he thought the problem was the signal board. Would you agree? Several other people have had the same problem that I can tell, is the solution the same for everyone?
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Re: samsung model LNS4051DX/XAA won't turn on, just...
THE PROBLEM IS Faulty parts on PS board, bad press for Samsung Because the Samsung LNS4051D would not turn on and the power LED would blink 4 times and the relay would click and this would repeat again and again.I replaced power supply board parts CM806, 811, 812 & 817, all 1000 uf 10v capacitors, three had their tops bulged up slightly that I missed on initial visual inspection.After seeing the reports of problems with these caps on http://www.fixya.com/support/t1336881-will_not_turn_or_off , I replaced them with Radio Shack part 272-1032, 1000 uf, 35v.They are slightly bigger, but fit OK.TV is working fine now.Cost was 4 x $1.59 = $6.36 plus the time. I saved between $100 to 300 in the process of either replacing the board or getting the unit serviced.
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It can be T-CON board, 24vdc power supply, backlight inverter board, main board. First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board. if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having. If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Please see my basic troubleshooting guide here: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums http://en.wikipedia.org/wiki/Capacitor_plague Parts: www.shopjimmy.com Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps. Please post back what you find.
I just fixed this very same problem. The capacitors are
the problem. However, I think that if you have some minimal skills with
soldering, you can fix this yourself. You just need to take out the
system board, then the power supply parts are on the top right. The bad
capacitor(s) will be bulging at the top and possibly have some brown
stuff coming out. The ones that go bad are 1000microfarad, 10V, however
you can replace them with higher voltage. I got 35V caps from radio
shack for 1.59 each. You just need to solder out the bad ones and then
put the new ones in and solder. Remember that the negative end goes on
the side with the bold black part of the circle on the system board.
Then just cut off the extra ends of the capacitors. If you are capable
of doing this yourself, you will spend at most 6 dollars instead of
however much a technician costs.