Question about Samsung LN40A550 LCD TV

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Where can I ourchase a power supply board for a samsung LN40A550 LCD TV

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I don't know if they have the part in stock at the moment but I purchased one from ModusLinkPTS can go to their website where you can purchase one online ...I live in Trinidad in the West Indies and I got one delivered to me last November ... hope that helps you

Ian Jack

Posted on Feb 01, 2011

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Does not turn on either with the clicker or by pressing the ON/OFF button on the right edge.

The power supply board is failing. There are repair kits available or entire boards if you're not comfortable using a soldering iron. You can get all your parts here:
TV Parts Universal TV Stands DLP Chips ShopJimmy .com

Dec 16, 2015 | Samsung LN40A550 LCD TV

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Samsung LN40A550P3FXZA lcd TV (purchased 2/08) started turning off and on, neither the remote or side buttons will work, how do I fix this problem?

check for power supply board malfunction, replaced first bulged electrolytic capacitor. just let me know if it works.

Aug 03, 2012 | Samsung LN40A550 LCD TV

1 Answer

I have a samsung 40in LCD Model No. LN40A550. I turned it on and it made an audible pop. The television now cycles on and off and eventually powers on. The only problem is it's taking anywhere from 20...

From what I have experienced, I'm guessing the pop you heard was capaciter blowing out. If you take the back off and look at the power supply board, located in the lower center, you will probably see at least one capacitor (maybe more) where the top is swollen or poped out. You can find replacement capacitors at radio shack. If you know how to use a soldering iron, it is a simple replacement. If not, find a friend who does. This can be a very inexpensive fix. You can also find videos that show how it's done on youtube.

May 01, 2011 | Samsung LN40A550 LCD TV

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I have a samsung ln40a550 LCD and had a problem with it , the TV wouldn't turn on. So i did some research and found out that samsung had some crappy capacitors, so i called them and they came and replaced...

I would think if SAMSUNG came out to replace the bad caps and the TV is still not working right, I would think they should fix it correctly, may be the person did not do the good quality jobs and left. What does SAMSUNG say about this? The bad power supply could have unstable DC and could have damaged the other boards inside the set. You will need to inspect the power supply yourself, look to see the soldering works are good and everythings are put back together correctly with correct polarity.
Then you need to verify all the DC output voltages before going any further, it will not be an easy job.
Learn more here;

Basic LCD monitor and TV troubleshooting guide:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.
Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Replacement boards:

Dec 11, 2010 | Samsung LN40A550 LCD TV

1 Answer

Samsung TV doesn't turn on

There is problem with your power supply.First you check power cable replaced with another cable. After check cable is ok then there is problem in side your tv.It can check by opening your set back cover.After that check on power board there is fuse,capacitor or fet fautly. Note:Which part is faulty replaced with same number which is menstion on the part.

Nov 04, 2010 | Samsung LN40A550 LCD TV

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When trying to start the TV, blue light comes on, you can hear it try to come on, and it goes off and tries to start up again - over and over again!

Power supply board is dead.That the board where the a/c power cord plug into it.Replaced the power supply board,u tv will get stable power again and will work.Tries websites like, to buy a refurbish power supply board for the replacement.

May 19, 2010 | Samsung LN40A550 LCD TV

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Can somebody pls. help...our tv Samsung LN40A550 LCD would not turn on...the red light (power) keeps blinking & the blue bar is turned on too as soon as you plug in the tv but the screen won't turn...

This is a very common problem. The power supply board has failed and needs to be replaced. You can call 1-800-samsung to find out if this problem will be covered under a warranty and the nearest service center. I replaced at least 150 power supplies last year.

Mar 05, 2010 | Samsung LN40A550 LCD TV

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Samsung LN40A550 40-INCH 1080P LCD HDTV power off/on quickly

you need to be vigilante in your efforts to have the problem repaired under warranty this is an intermittent fault and they are obligated to address the problem in a timely manner, contact management, contact the manufacturer. put the wore in to warranty it works good luck

Jan 31, 2010 | Samsung LN40A550 LCD TV

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Samsung lcd is after turning on clicking for about 10 min

TV has bad caps on power supply they need to be replace.

Sep 30, 2009 | Samsung LN40A550 LCD TV

1 Answer


I do not have one of this LCDs to open it but you can check this website for a list of parts that should be inside it.
It should have the following parts:
Power supply, main board, LCD controller, backlight inverter board and key controller board.
Hope this helps you.

Jan 26, 2009 | Samsung LN40A550 LCD TV

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