Question about Samsung LA40A450 40 in. LCD TV
It sounds that the main digital board to your TV is damaged. It will be best to get this set repaired by the authorised service center for Samsung, because, the work is a skilled one, need so many service adjustments after the board replacement.
Posted on Jul 12, 2012
Just to be a little more detailed, since I just fixed this problem. It is 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.
Posted on Sep 25, 2009
with tv in standby press INFO / MENU / MUTE / STANDBY on remote tv will come on with service menu DO NOT CHANGE ANY SETTINGS
look at list you will see reset
ONLY USE DOWN NAVAGATION KEY until RESET is highlighted
then PRESS RIGHT NAVAGATION KEY the tv will reset
PRESS STANDBY TO EXIT
the tv will need retuneing after
hope this helps
Posted on Dec 19, 2009
If you do not hear the color wheel start to spin inside of light engine this may have failed also check to make sure fans are working and safety switch is making contact
Posted on Mar 05, 2010
I disagree with "saidneurot"
This is a comon problem with the Samsung LCD HDTV on the Power Board.
You can repair or replace -
Faulty parts on PS board , bad press for Samsung.
When checking the capacitors, If they are slightly rounded on the top where the X is, the cap is defective.
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
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. If you are not comfortable
replacing components which means using a soldering iron, you
can replace the power circuit board, available from
Some UTube showing the problem and fix -
Posted on May 27, 2010
Tips for a great answer:
Dec 20, 2013 | Cell Phones
Nov 09, 2010 | Samsung LN32A540 32 in. LCD HDTV
Aug 24, 2009 | Televison & Video
Jul 15, 2008 | Samsung Televison & Video
Jul 02, 2008 | Sony KP-51WS510 51" Rear Projection...
100 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: