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Samsung PN50A550 / PN58A550 Owners Thread - Page 187

post #5581 of 5660
only took 3 yrs but it looks like my panel is screwed.. i get some IR on anything that appears on the screen and the left side kind of flickers.. yeesh.. 3yrs old and she's junk.. it just hit the magic time of two yrs on it as well when the warranty expired.. joy...
post #5582 of 5660
Mine will be 3 years old in mid-may 2011, always had that pink and green
hue on white background, but other than that...WOW, the picture is as
beautiful as for the first day I took some numbers in the forum to adjust it and
since then I did not change anything, yet.
post #5583 of 5660
Quote:
Originally Posted by xraytube View Post

So, Samsung replaced my defective 5064 with an A550 back in October. Good deal on the surface going from 720p to 1080p. Well, my new A550 now has the same problem mentioned above after approximately 5 wks of use. The set cycles on and off when we first turn it on. Takes about the same number of cycles, 6ish. It really looks like the TV is rebooting itself. Each cycle results in more "stuff" being displayed. It starts totally black, goes to a noisy green screen, then screeching noise from the speakers and noisy green screen, and lastly a good picture and sound. Samsung has been called and they will be out to service the TV later this week or the following week.

The TV did not start this way and initially I was quite happy with it. The TV appeared better in every aspect than the 5064. I am not so happy now. If they want to take the TV back to the shop I will be really angry........

Quote:
Originally Posted by jjeeffff View Post

Have them come out and replace the power supply and main board. That's what they did to fix my set and it works perfect now. Give them a call, it only took them about 15 minutes to fix it.

For anyone with the green screen, screeching, power cycling issue that has a PN50A550 out of warranty (like me), I replaced the main board myself with one purchased off ebay and the problem is fixed. It cost me around $90.
post #5584 of 5660
Has anybody seen the following? This is a new problem I'm having where, when watching TV it will occasionally go blank for about 1 second and then come back on. When it comes on the HDMI1 (or whatever is the current input) flashes up in the left corner. It seems like it may be trying to automatically switch inputs but then comes back to the only one that is plugged in.

I recently had my HDMI PCB in my receiver replaced and this started happening a day or so after I got the receiver back. The cable runs through the receiver and then to the TV.

Thanks!
post #5585 of 5660
It probaly has something to do with your reciever. I had that problem with my c7000 and my onkyo sr308. I thought it was my tv until I plugged strait to my htpc and I didn't have problems so I got another reciever
post #5586 of 5660
I agree, by pass the receiver and see what you get...
post #5587 of 5660
Thanks guys -- I'll try that.
post #5588 of 5660
Quote:
Originally Posted by blueblazer22x View Post

For anyone with the green screen, screeching, power cycling issue that has a PN50A550 out of warranty (like me), I replaced the main board myself with one purchased off ebay and the problem is fixed. It cost me around $90.

Well sad to say I'm having this issue now too as I'm afraid a lot of people are having or will have. My A550 was bought in Jan. 2009. After I started researching this issue I found that many people who own Samsung LCD's and some Plasma's are having the same power cycle problem. It stems from bad power supply units and/or underpowered capacitors. So many LCD's have this problem that Samsung is now agreeing to fix them even out of warranty. Unfortunately they aren't covering our Plasma's yet. So many are having this problem and aren't getting Samsung to cover it and it's not looking good as there is a class action law suit against Samsung for this very problem. The law firm, abingtonlaw (I can't post there URL yet) is the firm who is starting this law suit. And you can join it too if you were "burned" by this problem.

Anyway I'm going to try and fix this on my own and could use some advice from Doug or anybody else who has tried this.

Here is what I have done so far. I unplugged my TV and removed the back and checked for visible and obvious signs of a blown capacitor or fuse. I also tested the fuses for continuity, they were fine. I do know that just because a capacitor isn't blown or look bad it can still be defective. So I unplugged my power supply board and took down all the numbers for the capacitors. My power board is a BN44-00222A, Rev.1.1. I thought I would try and replace all or most of the capacitors. That being said I believe if I replace all of them there are at least 25 different ones with many different sizes and volts. So I don't think I will replace all of them but just the smaller ones that I have seen blown on so many different TVs.

Here is the list of my capacitors I'm thinking of replacing.

3 - 2200 uf 10v
1 - 2200 uf 25v
2 - 1500 uf 35v
3 - 1000 uf 25v

I will replace with higher voltage caps. It won't be all the caps but it's a start, If anyone has any suggestions for which caps are most likely the culprits please let me know.

After I replace the caps and it still doesn't work are they any other suggestions?

I'm almost positive it's the power supply board so if the new caps don't fix it I will have to buy a new board. That brings up another question. Nobody seems to have any in stock expect in China for $126.00 USD or I can get them from Ebay used for $131.00 USD or lastly direct from Samsung but for $168.00 USD. Other companies have them for much cheaper ( I saw $84.00 USD) but like I said they seem to be out of stock. Does anyone here have any recommendations for where I should buy the power supply board?

The last option will be a tech to come out but I really don't want to do that for the money they will charge me.

Any advise will be helpful...
post #5589 of 5660
I bought my PN50A550 in October 2008-- so it's currently about 3 years old. Tried to turn it on Tuesday morning and it began to cycle on and off without my assistance. A couple of times I was able to get the "Source" menu up-- no longer. Unplugged HDMI and other source cables and checked connections including power plug; unplugged for a long period and plugged back in; tried an extension cord from another outlet in the house. None of these attempts were successful. Tried holding down the "Exit" button to reset (I know I read that somewhere). Sometimes I get some bizarre color banding to appear across the top of screen from left to right.

So now I am planning to order a replacement power board BN44-00222A in the hope that will solve the problem. I have yet to contact Samsung. Based on a Google search, I am planning to order from samsungparts dot com. Having called their customer support, I know the part "may be refurbished".

1. I could not find a source for guaranteed new parts (including on the Samsung website). Do these exist?

2. Has anyone done this repair who can offer comments on the level of difficulty? I do everything DIY, but have minimal experience with electronics. I do own a soldering gun. But I would not be comfortable trying to replace all the capacitors (per previous post).

3. Am I a fool for not calling out a tech?

Thanks in advance for any opinions or advice.
post #5590 of 5660
Quote:
Originally Posted by GeoffHouston View Post

I bought my PN50A550 in October 2008-- so it's currently about 3 years old. Tried to turn it on Tuesday morning and it began to cycle on and off without my assistance. A couple of times I was able to get the "Source" menu up-- no longer. Unplugged HDMI and other source cables and checked connections including power plug; unplugged for a long period and plugged back in; tried an extension cord from another outlet in the house. None of these attempts were successful. Tried holding down the "Exit" button to reset (I know I read that somewhere). Sometimes I get some bizarre color banding to appear across the top of screen from left to right.

So now I am planning to order a replacement power board BN44-00222A in the hope that will solve the problem. I have yet to contact Samsung. Based on a Google search, I am planning to order from samsungparts dot com. Having called their customer support, I know the part "may be refurbished".

1. I could not find a source for guaranteed new parts (including on the Samsung website). Do these exist?

2. Has anyone done this repair who can offer comments on the level of difficulty? I do everything DIY, but have minimal experience with electronics. I do own a soldering gun. But I would not be comfortable trying to replace all the capacitors (per previous post).

3. Am I a fool for not calling out a tech?

Thanks in advance for any opinions or advice.

Geoff, i ended up buying a new board from china and then after that my panel died and so I was left with two perfect power boards... So now I'm ebaying both of them, right now actually. So if you want you can buy mine from eBay, a lot cheaper than what I paid for it. My user name is SeattleRichardson on eBay.

Anyway good luck!
post #5591 of 5660
SeattleRichardson,
given that the power board replacement did not help you, I plan to do a little more troubleshooting using a Service Manual I found in order to try to eliminate some of the variables. Thanks for letting me know about your auctions. Once I feel like I know what I'll need, I will PM you to see if you still have the part(s). Good luck with your auctions and your new display!

In the meantime, any other thoughts or input would be appreciated.

Geoff
post #5592 of 5660
How did you get the manual?

Thanks.....
post #5593 of 5660
Quote:
Originally Posted by GeoffHouston View Post

I bought my PN50A550 in October 2008-- so it's currently about 3 years old. Tried to turn it on Tuesday morning and it began to cycle on and off without my assistance. A couple of times I was able to get the "Source" menu up-- no longer. Unplugged HDMI and other source cables and checked connections including power plug; unplugged for a long period and plugged back in; tried an extension cord from another outlet in the house. None of these attempts were successful. Tried holding down the "Exit" button to reset (I know I read that somewhere). Sometimes I get some bizarre color banding to appear across the top of screen from left to right.

At least I am not the only one with this problem. My PN50A550 is 3 years old and when I turned it on several days ago it just started cycling in the same manner. Samsung was zero help and I finally decided to have a service tech come out and check the TV. Let me save you some money. He went through and ran a few checks and disconnected most of the boards to try and isolate the problem. With a tech manual I could have done the same. He finally narrowed it down to two possible problems. The main board ( the one with all the component connections) and the Logic board (the one with the two flashing LEDS). I am not an electronics guy so that is as detailed as I can get. The replacement price for the Main board was $200 and the return service fee was another $100 so the total bill for the fix would be $400. With a new set around the 800 to 1000 mark it has been a hard decision to make on what to do. I have searched for a cheaper Main board on the internet, but have not found any that I would trust for the price they want.

If anyone has a spare Main laying around let me know. The tech could not confirm it was the main and said it was his best guess. If it turned out to be the Logic board they would not charge me for the return visit or the replacement part for the cheaper Logic board.

If anyone else has this problem, to better describe it, the tv does the following as well. It will not turned completely off so you have to unplug it to get it to stop cycling. The LED light in the front will not go out and you hear the tv click on and then after a short period of time it clicks off and back on with no screen change. Several times the screen will have a patch of color on the left side or along the top (it only did this at the first). Once it actually powered completely on for about 10 seconds before cycling (again at the very beginning.) Once it also turned the speakers on with static for about 15 seconds. All of the remotes have had the batteries removed, all of the HDMI cables connected, removed, and connnected to other ports, power cords were swaped out, and it was plugged into different outlets with no change. The buttons will chirp when pressed on the tv with no results.
post #5594 of 5660
Quote:
Originally Posted by BKMDNO View Post

At least I am not the only one with this problem. My PN50A550 is 3 years old and when I turned it on several days ago it just started cycling in the same manner.

Wow, BKMDNO-- thank you very much for taking the time to share your experiences with your technician visit. I took the back off my TV early this week and visually inspected the capacitors-- all of which seem to be in good shape. Tested the continuity of the fuses-- no problem there. I have been working up the nerve to do some voltage testing on the power supply board this weekend, and will let you know whether the voltages are within the proper range. Since your symptoms are exactly the same as mine, however, I am worried it may be one of the other boards-- apparently more difficult to isolate, if your tech is correct.

IF you do decide to try to repair your existing Samsung panel, please come back and let me know which board it turned out to be-- might help me avoid 'flipping a coin' on my own replacement sequence. Thanks again for your input.
post #5595 of 5660
Still also amazed at how good my PN50A550 picture is after 3 years as well. I go to my father's house who has a newer, more expensive Toshiba LED and it looks like crap compared to my picture.

No burn-in issues, despite playing video games, etc.

Only thing I still am a little sore over is the fact that they originally advertised the TV as 3D ready (even had it on the specs on the Samsung site for months after it was released). I realize it was a mistake, but wouldn't have minded the 3D capabilities. That said, there's no way I'm getting a new TV just for 3D.
post #5596 of 5660
My experience was almost Identical to BKMDNOs. Constant rebooting of the TV, with no display, which could only be stopped by disconnecting the source power plug. Flashes of color along the top or crushed to the right hand side, with static noise or a loud squeal occasionally. I ended up paying $350 for the replacement of the boards. The TV is now working fine & hasn't exhibited any of the symptoms since it was fixed, almost a month ago.....
post #5597 of 5660
Well I bit the bullet and paid to have my TV fixed. I found the part I needed but just in case it was another board causing the problem, I decided to have the local Samsung repair shop do it for me. I was charged $100 for them to come to my house and put the part in. So if any of you with the same problem want to fix it yourself, here is the part number. BN94-01658B. I think I found it at andrewselectronics.com for $150 + core return. If anyone has questions send me a message and I will try and get back to you.
post #5598 of 5660
Does anyone know where I can get a service manual for the PN50A550? I'd like to do some troubleshooting to see if I can identify my problem. Thanks!
post #5599 of 5660
Hmm ... recently installed an HTPC into my system via HDMI into my Marantz AV7005 and out to my A550. Resolution on the card is set to 1280x1024. For some reason I can't select "Just Scan"? I thought Just scan was available with that resolution, but all I can select is 16:9 and 4:3. I have a blue line on the left of the screen I'd like to get rid of. Amy idea's what I'm doing wrong to have lost the Just Scan option?
post #5600 of 5660
Oh wow was I glad to find this thread. Same issue for me, I watched Thor last night, went this morning to turn on the news and endless power cycling with the flashing red LED (and of course Samsung is useless in tech support). I have not yet pulled the back off yet, but is the consensus that the power supply board is what is causing the issue, is so does anyone on here have one they would like to sell?

Thanks anyone for any additional tips than what I have read!
post #5601 of 5660
Quote:
Originally Posted by erikill View Post

Oh wow was I glad to find this thread. Same issue for me, I watched Thor last night, went this morning to turn on the news and endless power cycling with the flashing red LED (and of course Samsung is useless in tech support). I have not yet pulled the back off yet, but is the consensus that the power supply board is what is causing the issue, is so does anyone on here have one they would like to sell?

Thanks anyone for any additional tips than what I have read!

I went on google and searched and found a new board for mine when it went bad and the replacement was a breeze. Literally I just had to remove the back cover, unhook the connectors, unscrew, re-screw, rehook, replace the back and BAM. Coincidentally, the new power board came with much larger CAPs so I expect this one to be better over the long haul.
post #5602 of 5660
Quote:
Originally Posted by nicholc2 View Post

I went on google and searched and found a new board for mine when it went bad and the replacement was a breeze. Literally I just had to remove the back cover, unhook the connectors, unscrew, re-screw, rehook, replace the back and BAM. Coincidentally, the new power board came with much larger CAPs so I expect this one to be better over the long haul.

Thanks - I did pull the back off and the board looks ok, some of the main power caps do look like they might start to be failing, so I went ahead and ordered a replacement board off ebay for 90 bucks shipped and 6 month warranty FWIW (with 2 day s/h). I'm crossing my fingers since I wasn't ready to upgrade to a 65" plasma quite yet... :-)
post #5603 of 5660
Well I just swapped the PS out, no dice same issue. So I guess I'm now stuck paying the 150 for the technician visit to fix the tv, unless any other tips to troubleshoot?
post #5604 of 5660
Quote:
Originally Posted by erikill View Post

Well I just swapped the PS out, no dice same issue. So I guess I'm now stuck paying the 150 for the technician visit to fix the tv, unless any other tips to troubleshoot?

Could be a cold/weakened solder joint, reality is, you'll keep guessing and spending money on various fixes without knowing for sure whether they'll work.

$150 for them to check it isn't bad, given it was unfortunately already $90 to replace the PS board.
post #5605 of 5660
Quote:
Originally Posted by pbc View Post

Could be a cold/weakened solder joint, reality is, you'll keep guessing and spending money on various fixes without knowing for sure whether they'll work.

$150 for them to check it isn't bad, given it was unfortunately already $90 to replace the PS board.

That's what I'm thinking too, I've been using my VOM to check a lot of the connections. Luckily I did have a return option on the PS board, just have to pay to ship it back. I can eat the 5 bucks there, now trying to find this main board too (like the two members above).

My 27" Panny from probably early 2000 still works great, what happened to this old build quality?

EDIT: I just went and picked up the main board from a local place and to my delight it works. Thanks guys!
post #5606 of 5660
My 4 yr old 58A550 just started acting up. The 'cold start' turn on is becoming a real nuisance. It goes through a bunch of on/off cycles while the display is showing a bunch of screens ranging from a green w/ vertical stripes, to a blue w/ vertical stripes to a couple of what I would call noisy pixelation. After approx 1 to 2 minutes it finally locks to the input signal and displays a 'correct' image. It's solid from that point on. If I turn it off and than on (after it's 'warmed up') its just fine. I don't use the 58A550 audio at all so I don't know what its doing during this 'start up' time.

I suspect it's either the power supply board or main board. I've searched this forum as well as other places on the web and really haven't found a definitive solution. I don't want to pay Samsung's service shop for a service call ($65), diagnostic evaluation ($50), fixed fee service labor ($225) and of course the part ($150 to $300). It's not worth sinking $500+ into this heavy heat emitting beast although the image to date has been outstanding.

I don't mind buying off ebay a board to replace the culprit if only I knew which one it was.

Anybody out there have an idea or a method I can use to determine which board I should replace?

Much thanks in advance . . . . .
post #5607 of 5660
Hi everybody,

I own a PS50A550. I have recently bought calibrationsoftware and equipment, and was doing pretty good calibrating. However, I decided to go into the service menu en calibrate greyscale from withing the service menu. So far so good, got exellent results. But being the stupid dumn n00b that I am I did not make notes on the orignal settings frown.gif Now I cannot get close to the best setting I had anymore, and would like to start from scratch again. Does someone have the settings voor sub bright and sub contrast in the service menu? I know for sure that the colors should all be 128, I just dont know these settings anymore. Below a photo of the list in the menu where these settings are;

448
Edited by Wouter73 - 6/24/12 at 9:21am
post #5608 of 5660
Quote:
Originally Posted by blueblazer22x View Post


For anyone with the green screen, screeching, power cycling issue that has a PN50A550 out of warranty (like me), I replaced the main board myself with one purchased off ebay and the problem is fixed. It cost me around $90.


thank you jjeeffff and blueblazer - i also replaced the main board, but didn't find it as cheap as you. for 140 bucks the screaching, power recyling has been eliminated by replacing the main board. I appreciate both of you taking the time to post here and share your knowledge.
post #5609 of 5660
I have an issue with my LN40A550 and there is a class action suit on some models - check this link to see if it is on yours. Blown Caps on the power supply boards: http://www.samsung.com/us/capacitorsettlement/
post #5610 of 5660
I finally sprung for a refurbished part from samsung parts dot com-- the only place I could find a main board (BN94-01658D) anymore. Everyone else is "backordered" or out of stock. Nothing showing up on EBay. See my previous posts for the symptoms, but like nearly everyone else with problems on this model, my problem was the Main Board-- the one with all of the input and output ports (HDMI, RCA, etc). I appreciate everyone posting their follow up stories here in order to help convince me to spring for this board rather than the power board. The replacement board is working, for now. Good luck to the rest of you.

Geoff
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