Question about Samsung LN40A550 LCD TV

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While watching tv throught a cable box screen went green with black lines then the tv shut down by itself and restarts this has happened more then 6 times i called a service tech but he could not find anything wrong

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Check all the cable connections from the wall to the tv and other thing check to make sure the power cord is plugged in tight to the rear of TV.

Posted on Jan 03, 2011

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While I was watching my Emerson TV I heard a loud click and the screen went black and audio went off. When I press tv button on cable remote the tv button glows red, and nothing happens on the tv.


Hi the power supply might have shut down through overheating turn the power of at the wall socket & wait for a short time before trying again the TV might reset itself if this doesn't work its probably shut down from a faulty component. good luck

Oct 23, 2016 | Emerson Televison & Video

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It sometimes makes a static nose and the picture is dark i have tried messing with the color and back light settings and it doesn't do much


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Hi, I have a Samsung LN40A550 LCD TV which I have had for just over a year. ... I was watching TV yesterday and all of a sudden the picture went all. ... started makinga very high pitched buzzing sound with no picuture coming on. We did have a bunch of green vertical lines, but now just a black screen.

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Feb 03, 2016 | Samsung Ln40e550 40 1080p Lcd Tv ln40e550

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My tv won't work after I shut it off using the remote throught the cable box


You need to turn on the cable box again. Make sure to select the right source again for your tv.

Jan 11, 2014 | Seiki 32" LED HDTV SE322FS - CAM CONSUMER...

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Screen went black with a couple vertical colored lines


Check the tcons connections ( both flex cables and also the LVDS cable) if that doesnt solve it would suspect the Tcon as being defective. For further assistance please respond to this same post.

Jan 01, 2013 | Westinghouse 32" Flat Panel LCD HDTV

1 Answer

Screen black


If its a Plasma or LCD set it is very likely the panel was damaged/destroyed inside...happens a lot.

Mar 26, 2012 | Televison & Video

1 Answer

I have a 6 year old(nov 04) Sony KV-30HS420 that turns off all by itself. The screen goes to green and the picture fades to black. The sound will keep playing for a few seconds then the TV will turn itself...


If the screen goes rather bright green it is one of two things:

1. It is possible it is a shorted green gun in the picture tube, there are three of them, red, green and blue guns in neck of the tube.

2. The other possible reason is there is a problem on the small circuit board at the end of the picture tube, this model should use three IC chips, one for each red, green and blue.

Being intermittent makes it hard to tell but ask the shop if they tried the self check this set should have. With the set turned off use the original Sony remote and hit Display, 5, vol down, and power.

If the set has a self check (it should) a box will appear on the screen with up to five items with a zero to the right of each, items will be like AKB, OVP, etc, and if any have something other than a zero to the right it pinpoints what happened.

Sets with this feature record each event where something goes wrong, ANYTHING other than a 0 indicates what failure was detected.

If I was to make a guess there will be a number next to AKB, which is Anti-Kine Bias, this means the picture tube or something on the board at the end of it drew too much current and the set's shut down circuit turned the set off.

I actually fixed one of these where both the blue and red IC chips on that board were bad, needless to say, I replaced all three of them.

Any good shop would know about the self check and even if the set did not shut down in the shop the self check would point to the area where the problem is.

Let me know if you need more help or find a error code.


REGARDS, SD TECH

Dec 01, 2010 | Sony FD Trinitron WEGA KV-30HS420 30" TV

1 Answer

TV turns on with a green screen with curved horizontal lines.


It seems you may have a serious problem with your video board. That's why you are getting those symptoms. It's better if you replace it asap!

Aug 04, 2009 | Mitsubishi WS-48315 48" Rear Projection...

1 Answer

Sony Trinitron 20" TV (KV-2093R) Suddenly Shut Off


2 things that will cause that vertical IC or Yoke! Listen to this one went on service call 2wks ago Customer had a 50 INCH1988 pioneer big screen replaced 3 capacitors resolder poor connections TV is now working like New ?

Jun 23, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Our tv turns green and shuts off every 5 min. or so


try plugging the cable line directly into the tv skipping the cable box,then let me know what happens

May 20, 2009 | Samsung LT-P1745 17 in. EDTV-Ready LCD...

1 Answer

Problems with green arching lines


yes there is a small black box with 6 controls on it, take off the bottom front of the tv, behind that you should find a black piece of plastic you can remove by taking out 2 more screws. the black box should be in the upper rhs.now i don't remember if the top 3 are the screen controls or the focus controls. the rows should be labled, you are looking for the screen control row. the green control is the middle one. you can try turning down the control till you no longer see the green lines. try adjusting in a dark room, it will be easier to see the lines & when they are gone. if you problem is not solved by trying this, then i agree with your tech & the green tube is bad. good luck.

Oct 23, 2006 | Sony KP-65WV700 65" Rear Projection HDTV

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