Originally Posted by blueblazer22x
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...