Samsung LCD TV - LNS4051 power on problem

[SpotTheCat]

Yes, change them all, no don't use a $x,000 television as a science project. In other words, don't use this as your first soldering project.

[zazik]

Those are electrolytic capacitors, and they do have a polarity, which is very important. On the 4th picture you can see circles drawn on the PCB for the capacitor place. Inside there are two holes with the icon inside, the hole with the T shaped line is '+' the other one (Y shaped) is '-'. Capacitor cover has a mark on the '-' side' a white strip with big minuses. Original capacitor also have those marks on the surface, just follow original orientation.

[andyhock2009]

Yes, change them all, no don't use a $x,000 television as a science project. In other words, don't use this as your first soldering project.

silly question whats the worst outcome????? very strapped for cash.....CREDIT CRUNCH LOL also i found a nearby supplyer that sells 1000uF 16v radial electrolic capactitors do they get a thumbs up? cheers.

[SpotTheCat]

Yes, change them all, no don't use a $x,000 television as a science project. In other words, don't use this as your first soldering project.

silly question whats the worst outcome????? very strapped for cash.....CREDIT CRUNCH LOL also i found a nearby supplyer that sells 1000uF 16v radial electrolic capactitors do they get a thumbs up? cheers.

The worst outcome? You hurt yourself and paperweight your TV. At least get an experienced friend to help you.

[AlexClapton]

Thanks to this board I have found my problem. I have 3 bulging capacitors and 2 of them are also leaking. Samsung LN-S5296 less than a year old.

My question is, given my limited soldering experience and 1 year warrenty in effect, should I call Samsung customer service and let take care of it. Or head to the electronic store and buy some capacitors?

Any help would be appreciated. Thanks.

[SpotTheCat]

My question is, given my limited soldering experience and 1 year warrenty in effect, should I call Samsung customer service and let take care of it. Or head to the electronic store and buy some capacitors?

Yes! Of course see what they're willing to do.

[gphin]

so, if you haven't already picked up a phone and contacted samsung about this issue on the LNS4051 please do so now. just off the phone and seems that viewing online forums of said problem doesn't qualify as "significant" or "verified" common problem with this piece of electronic equipment! in other words, not enough verbal complaints to make it a certified issue with this set. mine was purchased 12/06. had to dole out almost 25%ofpurchase price to resolve my problem. am going to assume that many , if had theirs repaired, had to purchase , and i quote, IP BOARD;P40,LE40R71B. whatever those cylinder shaped dohickeys are....they were venting when they shouldn't have been. so, i made it a point of venting with "excutive consumer dept" at samsung and yes, all they did was listen , say so sorry and that's why we offer the extended warranty. they need to know when their product is not up to snuff so they can fix the problems with less expense to us the consumer. please,please contact samsung if you already havent so we can make it "their" problem. times are tuff already. the repair wasn't really affordable to me but i did it because in the scheme of things TV viewing is relatively cheap entertainment.
thanks for listening and again contact samsung with your problems.

[Sittingduck2nd]

Dear all other Samsung users with TVs not turning on.

I wish to share my experience with you all, to show that success can be achieved.

I had a 2 year old Samsung LCD 32" TV ( LE32R72BX ), suddenly one day it just would not turn on. The LED just blinks and nothing happens. After going through all the motions as switching off for hours, restarting, checking all connections, and of course hitting it!!

I contacted Samsung support, but since it was out of guarantee they were useless. The just advised me to contact a tv repair shop.
I spent the better part of two weeks researching the internet for help and found this forum and thread which helped me the most.

What the problem was with my TV was that the power supply board was produced in the two year period where Samsung produced these board with too low capacity resistors, capacitors etc. (not sure which parts though). The stats pointed to the power board being the culprit. I opened up the tv and found the serial code and power supply board ref nr. I found a Samsung spare parts shop online (link further below) and sent them an email asking if they had a spare board. Not only did they have a spare part, but they had even matched it with a newer board which is compatible with my tv and previous board. My old ref, nr was BN96-03775A or BN-9603775A (Because searching online can be spelling sensitive 8-/ ) they had the following board "Samsung PCB power supply assy PFCLE32R71B". It was £94.97 inc. VAT.
I had it 2 days later and after 5 minutes exchanging it and turned it on. It worked!

So instead of buying a new TV or even spending in the excess of £200 at the repair shop I fixed for £94.97. Brilliant!!!
Note, it was a calculated gamble, because it could easily have been another problem, but n my case it paid off.

So keep the faith and do your homework and you might fix it.

All the best to you. Regards Sittingduck2nd

Shop: http://www.4mysamsung.co.uk/cgi-bin/home.pl

[zazik]

Hi people,
I wasn't posting those pictures to heat you guys up and saying go do that. And I'm sorry that it led you to such conclusions. I just shared my experience in fixing the problem. Yes, I have some hobby experience in building circuits, and I can say that this task is not for everyone, especially not for those who never held soldering tool before. I did it because I knew that I could do it.

Basically, I just showed what most probably repair technician will do in case you call for one if your TV is out of warranty. You will be lucky getting TV fixed like that in-home paying $200-250 for call plus $70-100 for one hour labor plus $20 for parts plus tax, total around $400. In the worst case you will let him take your TV to the lab and get a call that you need new PS/LCD/Inverter/Core board paying much more extra. I'm not going to judge either side, still I prefer to be on a side that gets money

Speaking about warranty, it is recommended to use it. Most probably entire PS board will be changed to shorten service time and there is a chance that new one will have correct capacitors and the it'll last much longer than just a year or two unlike original one. If not, so you will be facing a dilemma fixing it again by your expense or buy a new TV. In this case (in case of new Samsung ) very likely you will consider an extended warranty. Statistics shows that very few percent of people that bought it actually used it.

Now, if TV is out of warranty and you feel that you can fix it DIY way for $6, you are still taking a risk of damaging your TV (to total loss condition), hurting yourself, burn your home etc. So, if I scared you enough, the second best solution is to go to ebay and buy complete new PS board, then the only tool you will need is a screwdriver.

If you want to blame whole Samsung for bad capacitors that actually weren't bad, it is your right, but the fact that they (their nominal) just chosen inappropriately or some other parts (inductors for example) that caused capacitors to inflate. I'd rather blame people factor. Those who set the price limit for parts needed to make that PS board, people that asked: "can we use 10V ones and save a buck per TV?", and those who said: "yes, but they won't last more than 2 years", and those who decided to save it. And the most, those who give the power to unqualified people. Such people always exist and it doesn't matter what product and manufacturer we are talking about.

Those where my ȼ2 for those $6 I already spent
Happy fixing (whatever way you choose to do it).

[andyhock2009]

re zazic!!!!! if i were to do this fix myself i am confused as to how i would mess it up and completely break my tv! surley if worst comes to worst i would only need to go buy a new board???????????????

[zazik]

If you solder capacitors wrong way (I'm talking about polarity) OR rework is done roughly (drops of solder may shorcut traces on the printed side), capacitors or other parts may blow up damaging more parts physically (less likely) or/and electrically (more likely) on other boards (core/LCD/inverter). Total cost of that damage may be not worth another repair.

[andyhock2009]

gonna try it any way! been watchin how to vids on youtube..........should be gettin capacitors 2moz!!!!!!!!!!!!!!!!!!..........................watch this space lol

[msb0491]

We experienced the on/off problem in late February (LNS4051 2 years old). I have spoken to Samsung several times and they could care less. I mentioned it appeared others have experienced the same problem with this particular model and their stance is that they've never heard of another customer having the problem. If anyone knows of a possible class action, please post on forum.

[andyhock2009]

just want to say a big thanks to all that helped me on this forum!!! cost me £2.97 for the capacitors 10mins soldering and tv came on straight away! was very nervous about switchin it on lol was waiting for a bang lol again big thanks and something needs to be done about samsung there must be hundreds of people with this issue forking out x amount of money!!!!!!!!!!! im so happy lol and football is on tonight GET IN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[SpotTheCat]

just want to say a big thanks to all that helped me on this forum!!! cost me £2.97 for the capacitors 10mins soldering and tv came on straight away! was very nervous about switchin it on lol was waiting for a bang lol again big thanks and something needs to be done about samsung there must be hundreds of people with this issue forking out x amount of money!!!!!!!!!!! im so happy lol and football is on tonight GET IN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

hah, I believe you that you got it working, but I doubt you got it done in 10 minutes on a first-time solder job. Nice work though, do you have any pictures? Were there any clearance issues?

[lebyrd]

I also had the same problem with my 22 month old LNS405D1 taking longer and longer to start and eventually not start at all. So I was very happy to find this site, I figured that because I had the exact problem that was being discussed I had found the solution! Well I purchased the parts from my local RadioShack and set out fix my HDTV myself! Now I am a computer tech and repair notebooks and desktops everyday so I figure no problem, I'll just check out some websites and teach myself how to solder and save myself a bunch of money! Well after several hours de- soldering and soldering, the TV was worse off than before!
I found a site (http://www.encompassparts.com/shop_guest.asp) that had a board (BN44-00134A IP
BOARD) for $103 dollars so I ordered it. So, I thought that while I waited to get it shipped next week there was no harm in trying to de-solder and re-solder the board a second time (after reading this information at ( http://www.epemag.wimborne.co.uk/solderfaq.htm) the TV works GREAT!! I had just done a terrible job of soldering the first time around. I just wanted to share my experience and THANK YOU ALL for sharing yours with me!!

[larry121]

Thanks to all contributors to this forum. My LNS4051 had the obviously bad caps and I replaced them with the radio shack parts. Now my wife thinks I can fix anything.

Larry

[kbseattle]

The help on this page has been great. I have a two year old Samsung LCD that began taking extra time to turn on. Three days ago it was taking 4 hours to come on and then finally refused to come on at all. Based on what I read on this site, i removed the back panel and found the exact four capacitors slightly bulging and leaking a black colored substance. I've never soldered or even touched a circuit board before. But I unscrewed the circuit board and then went to Radio Shack and got four new capacitors (the same ones described above). I bought a cheap soldering iron ($8), some copper desoldering braid and some silver PC soldering metal. It took me a little while to figure it out, but I placed the copper braid on the existing solder joint and then the heated soldering iron on the braid, once the braid started smoking i removed both at the same time and the old solder was gone. I was then able to pull the old capacitor out. I placed the new capacitors in - make sure that they match up with the positive/negative pictures on the board. Then I used the silver soldering metal to place a new connection around the newly placed capacitor. Once i got the hang of it, it took about 15 minutes to remove all four and place the four new ones. I put everything back together and the TV came on instantly. I spent a total of $30 for the new capacitors and the soldering equipment. Can't beat that! What an accomplishment! Thanks for the help, everyone!!!

[laff_aloud]

My gratitude to all the helpful posters. Especially the visuals they really helped me. I live on a small island and it was a real pain to take the TV to town not to mention the expense. Mail ordered the parts and took a whack at it and it worked great! Not the cleanest soldering job, but it was effective. Thank all!

[Kjeil]

Hello,

I am so glad I found this thread, it looks like it is going to save me hundreds.

I do have one question though. I've always heard that you have to be really carefull changing capacitors in any television becuase they can hold really high voltage for a long time. I haven't seen any mention of that in this or any other thread so I'm thinking that maybe it is just a factor in tube televisions. The two huge capacitors in the middle of the board are the ones that are making me want to re-confirm. Any input would be appriceaited.

BTW - does somebody know a link to somewhere that explains how to check them and do a proper discharge? Thanks.

[ontheuptick]

Can someone point me to a good description on soldering?

I have a friend who does some electrical work and could probably help me out, but I wanted to know how tough it was, what's involved, etc.

Thanks for all the help in this thread!

[SpotTheCat]

Can someone point me to a good description on soldering?

I have a friend who does some electrical work and could probably help me out, but I wanted to know how tough it was, what's involved, etc.

Thanks for all the help in this thread!

http://en.wikipedia.org/wiki/Soldering

It's easy enough for a 9th grader to handle. On your first solder job, I would suggest getting a cheap kit like an FM modulator or a strobe light or something.

Basically you heat up two pieces you want fused with an iron and apply solder to the joint, which melts on contact. When doing through the back soldering, you simply fill up the well with solder, remove both the solder and the iron, and move on to the next one. One of the most important things is to secure everything so nothing moves while you're working.

[tivoROCKSme]

Very grateful for the information posted on this site. My LNS4051 is having the exact problems described here. I purchased it a little over 2 years ago. Very disappointing. I plan to take it apart tonight and examine the caps. I've soldered a few things in my day, so I'm fairly comfortable with replacing the caps if necessary. I am curious about discharging them tho. Any concerns about high voltage being stored anywhere inside the TV?
I'll report back with any success or failure.

[SpotTheCat]

Any concerns about high voltage being stored anywhere inside the TV?

Yes, somewhere in the power circuitry there will be some high voltage capacitors possibly storing enough energy to kill you. Leave it unplugged for a week.

[tivoROCKSme]

Well, I bought the 4 caps at Radio Shack but no luck. I think I melted the circuit board in one spot. Word to the wise, get the small 15 watt soldering iron. I picked up the 25 watt and think it got too hot which melted the circuit board.
I'll now be shopping for a replacement board, still much cheaper than buying a new TV but also a pain for only owning the TV a little over 2 years. If and when I do buy a new TV, it won't be a Samsung.

[SpotTheCat]

Well, I bought the 4 caps at Radio Shack but no luck. I think I melted the circuit board in one spot. Word to the wise, get the small 15 watt soldering iron. I picked up the 25 watt and think it got too hot which melted the circuit board.
I'll now be shopping for a replacement board, still much cheaper than buying a new TV but also a pain for only owning the TV a little over 2 years. If and when I do buy a new TV, it won't be a Samsung.

Pics?

[DROJAS73]

I also have the 40 inch Samsung LNS4051DX/XAA. My wife and i purchased this TV around Feb of 2007. So if you are doing the math we ALSO only had it for 2ys. I was surprised how quickly this problem progressed. Started having issues on Thursday (April 2nd 2009) and It was a done deal on Friday evening (April 3rd 2009). After doing some research I found this blog. Did everything that Zazik did and POW.....Problem solved!!!! I was one of the lucky ones that didn't have something else that was causing the power issues. The best advise that I can offer is....TAKE YOUR TIME! Don't rush through this. It can be done! I did it while my wife and son were out of the house so that I had no distractions. Took about 2 hours but it was totally worth it. Thanks Zazik....I owe you a beer!!

[jimbevs]

Thanks zazik (Mar 2 post). The pictures really helped. I opened up my S0451D and the capacitors were exactly as they looked in your picture, bloated and bulging. My biggest problem was finding the new capacitors. I had to visit three Radio Shacks to get the four 35V 1000uF capacitors. Guess they don't keep many on hand. I borrowed a soldering iron from work and after 15 minutes had the bad capacitors out and after another 10 minutes had the new capacitors in. Someone noted that the new capacitors they put in were rated for 85 degrees (as are mine) whereas the bad ones were rated for 105 degrees. But the degrees are in celsius, and 85 degrees celsius is like 185 degrees fahrenheit, so there should be little to worry about. Thanks again zazik and everyone on this board. Once again the internet proves very useful!

[jimbevs]

I've soldered a few things in my day, so I'm fairly comfortable with replacing the caps if necessary. I am curious about discharging them tho. Any concerns about high voltage being stored anywhere inside the TV?
I'll report back with any success or failure.

I left mine unplugged for about 2 days. I had no problems and I pretty much touched everything on the board. You should be okay with it unplugged for a day or maybe even less, but capacitors can store a big punch, so let it sit, unplugged, for at least a day or two before you start touching the insides.

Also, as you unplug the wires that are plugged into the board in order to take the board out note how the wires are plugged in. Maybe take a picture so you know what plugs in where and in what orientation. Its pretty obvious but its good to know you're putting it back together the right way.

[powela1]

I have a LNS4041 and had the same problem....The red light would blink 4 times and go off and then like 10 mins later it would repeat. You can hear the relay click inside. What I did first is check for voltage drops at the ribbon cable that goes from the Power supply board to the interface board. IF you are not getting the right voltages there you can assume the problem is with the PS board. PRinted right on the board is the voltages you should get at each pin. If you don't have a voltmeter, you can get one relatively cheap at radio shack or walmart. Next the that ribbon cable connection is a set of capacitors (black and white cylinder looking things) check to see if any of them have black stuff on top and look like they are swelling up on top. These are marked as CM811, CM817, CM818 and CS806 as stated in an early forum. ANd this info saved my life. I went to radio shack and got some new caps and soldered them on and everything is working fine. Note: if you don't know how to solder, it may be a good idea to find someone that does. But all together it was like a$20 repair, thanks to this forum...