Samsung forum: Samsung UN55B8500 - turns off by itself!

Mine just went bad 2 weeks ago but it has been doing it for months. It would turn change channels and also turn itself off and sometimes would go back on buy itself. Mine is still covered under warranty so just waiting for the insurance co. to get back with me.

I have been dealing with this for four months now and she finally kicked the bucket. I bought this thing the first week it came out and very irritated that Samsung isn't standing behind their products. Back to Toshiba I go. I have a nice LCD that has been a ok for 5 yrs ... No issues.

Hey guys i've been having the same issue with me Samsung UN55C6500 for about 1 year now. Just like in all cases it started doing it once in a while and now is nonstop and wont even start back on by itself anymore. The clicking sound is constant and i have to disconnected for at least 5 minutes for it to start back on. One thing that i have notice is that it will only shut down during tv commercials. I could watch 5 blue ray movies straight and it wont shut down but as soon as I put a normal channel and commercials begin it turns off. How weird is that huh? thats why I'm not sure its a capacitor problem because otherwise it would turn off no matter what i was watching. Has anyone had this particular problem? Can these tv's connected to the network get a virus? Wanna know a little more befofe calling Samsung to have a solid argument. Please reply. Thank you.

Hey dsuarez0127,

Generally, I'd recommend setting up service with an authorized service center, but could you do me a favor? Please send all this info in an email to this address qasupport@sea.samsung.com along with the complete model code, serial number, and firmware.

Thanks,
HD Tech

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I posted to this thread quite some time ago, ended up getting Samsung to come to the house and replace some boards. Seemed to help for a while but recently again it has come back quite frequently, happening 3-5 times just today. Going to get back in touch with Samsung to see what else can be done.....

Here in the USA I head to samsung.com and when I register my set I get 3 more months warranty. This would have pulled your set back into warranty.

I see they may have auto-extended it for you but in case you want to try again, get all your TRANSACTION NUMBERS along with dates together and try the post at the top of this forum.

Here's the link -> http://forums.cnet.com/7723-13973_102-542437/service-issues-click-here-for-help/?tag=contentBody;threadListing

I managed to fix my 4500 dollar TV Set. After I removed all the screws from the back of the set I disconnected all the cables leaving the power supply board. Then I pluged it in and the power supply relay picked up solid. I then checked all the output voltages 390 volts DC 5 volts DC and at least 2 or 3 more voltages I just cant remember the voltages might have been 12 volts 16 volts and 24 volts. But in any case there where 4 or 5 DC voltages present. Then I pluged in all the boards and the relay started clicking on and off. There are 2 relays on the power supply board. Then I started pulling off one plug at a time leaving the Main Board the one with all the inputs for last. Well to say the least the last board was the one causing the power supply to click on and off. The voltages where not steady voltages any more they where changing up and down. A indication there was an excessive load on the power supply. Any way you look at it it was looking like a 50 50 chance which board was bad the POWER SUPPLY or the MAIN BOARD. Well at 225 dollars per board I decided to start with changing the CAPACITORS on the Power Supply Board. Well I changed 6 or 7 capacitors on the POWER SUPPLY Card. These caps are near the Plug Connector that feeds the Main Board. They where all 1000 microfarad capacitors. And I changed one that was a 680 microfarad cap and replaced it with a 1000 microfarad cap could not find a 680 at RADIO SHACK so I bough all 1000 microfarad caps with a 35 volt rating. Replaced all those caps and solved my trouble now the second relay works also. That relay picks up when you turn the tv on if anyone has any more questions just email me. Samsung should own up to the fact they have a power supply problem. Inverter power supplys fail more often then a normal bridge retifier power supply. Because they are controlled by switching transistors and capacitors charging and discharging circuits to create different voltages. Frank mypenneys@hotmail.com

Help! It happened to mine a few weeks ago. Screen suddenly blanked out, cannot turn off, and with clicking sound. Only after unplugged for few hours, then it can be turned on. But same problem came back a few minutes later. Please give me advice. (Purchased from Amazon Dec. '09 for about $4K)