Samsung TV UE46B6050, turns itself on and off - Page 1
Forum section: electronics / general

author: neslekkim
author_rank: Super Contributor
timestamp: February 27, 2014, 07:54:04 pm
content: My tv starts to have some strange behaviour, I turn on the tv, and soon it starts to turn itself off and on, typically three times.After that, it stays on, I wonder if there is something that when it heats up, it keeps on, but while it's cold, it have this behaviour. (I think.. )Can it be that I need to change some capacitors? (Watched Dave's video about that)What else can I look for?, I bought it 8. january 2010, so I guess it's out of warranty now, and I don't see any need for buying an new now.

author: tom66
author_rank: Super Contributor
timestamp: February 27, 2014, 08:03:47 pm
content: It's a Samsung D series. These are probably the worst Samsung TVs ever made.Main board fault. They don't make the board any more so you need to source a used part which is currently very hard to get hold of.It might be possible to fix the main board, the principle suspect would be the main processor soldering (reflow required), followed by bad tantalum capacitor around CPU (common issue with older Samsungs), or bad voltage regulator/CPU. However, AFAIK, no one has detailed how to fix these boards, if it's at all possible/practical.

author: tautech
author_rank: Super Contributor
timestamp: February 27, 2014, 08:09:22 pm
content: Sounds like a thermal fault caused by a poor solder joint in the PSU.The 4 years of power cycles thermally stress PCB's and sometimes crack solder joints.Might be easy to find, listen for clicking/crackling/fizzing that could be in the mains (AC supply) area.I have seen cracked joints on the leads of the power devices for the SMPS.I see tom66 has posted a reply and his explanation will be based on experience.Wouldn't hurt to check my scenario as well.

author: jabramo
author_rank: Regular Contributor
timestamp: February 27, 2014, 08:17:02 pm
content: Had the same problem with my Samsung tv. For me it was bad caps on the power supply.

author: neslekkim
author_rank: Super Contributor
timestamp: February 27, 2014, 08:31:19 pm
content: damn..I was trying to find something at this sitehttp://www.tgohome.com/ServiceManuals/but not so easy to search for it there.I would guess finding mainboard for this would not be that easy, are they similar for 40-55" versions?Interrestingly I found somehting that looks like an mainboad for the 37"http://www.ebay.com/itm/321240598705Have to find out how to open it up, and hope it's the powersupply..

author: tom66
author_rank: Super Contributor
timestamp: February 27, 2014, 08:51:38 pm
content: Hmm, my error. Thought it was D series; it's actually B series. This is a little better. They do have some PSU issues but also main board issues. The main boards are definitely Samsung's biggest weakness.I run that site, unfortunately, no manuals available yet for this model aside from FAST TRACK.You can also try: Ciklon manuals (google it -- good resource), elektrotanya (max 2 download per day), e-serviceinfo, elektromaniacs,... It's also possible to buy the manual from Samsung on a CD, I recall it's around $15.00.B series is mid 2010 to early 2011 model, outside of Samsung's bad caps era; never hurts to check PSU voltages, though.

author: neslekkim
author_rank: Super Contributor
timestamp: February 27, 2014, 09:57:17 pm
content: Cool, found some docs here:http://elektrotanya.com/samsung_ue-32-40-46b6000vw-n74a.zip/download.htmlNo schematics, but exploded view, disasembly info, and the partslist/bom is there.