Question about Samsung SPN4235 42 in. Plasma HDTV
Smoke coming out of the plasma tv and burning smell and the tv won't come on.
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Posted on Jan 02, 2017
Unfortunately, your problem is familiar; the odor you smelled was signaling the death of an electrolytic capacitor.
The electrolyte gassed off after the part grew hot and finally burst.
You will not likely be able to do the repair yourself since the cap could have first been destroyed by the failure of a diode rectifier so replacing the cap may not cure the problem.
If you are adventurous, you might pull the plug on the set, allow the set to sit overnight, gain access to the innards, and with good light, inspect any boards inside.
If you see one that has few ICs but many more larger discrete parts, this will be the power supply.
Again, before touching anything inside, especially on that board, allow at least several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.
You are looking for components called electrolytic capacitors that are almost always cylindrical and mostly installed upright at 90 degrees to the board with leads passing through to the solder side.
This same type of component in smaller dimensions is still used in a horizontal package with leads bent down and passing though holes to the solder side.
The latter are becoming more rare since they don't lend themselves well to robot assembly.
Many failed caps (not all) will show signs of pregnancy when they fail, bulging unnaturally at the top when compared with others. Now and then, there may be traces of a crystalline deposit around the end where the seal failed from internal pressure.
These will have values listed on them in uFd & VDC and sometimes, a plus/minus number lying about the precision.
Some also have a date code (rarer) that will be four digits:
2403 = 24th week of 2003
Most electronics suppliers have a stock of the various values but if they have a date code at all, try to get only those made before 2002 or after 2006. This is due to the use of a defective chemical made in China and used in millions of parts made by other companies, never suspecting that they were building time-bombs doomed to fail.
The larger caps may be OK since the failure is likely related to functions other than brute-force filtering. A pretty good 'rule of thumb' is to replace any caps you see bulging of any value but especially those that are 100 uFd or less.
If you see signs of overheating such as discoloration of the board material, it may not be repairable but if you can find a part number on the board, you might be able to buy the power supply and install it yourself.
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
If you choose to replace it or have it done, the power supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload.
If you choose to replace failed caps yourself, you will need a quality soldering iron with a small, preferably iron-plated tip, rosin core solder and a sponge which when wetted is used to frequently wipe oxidized solder from the tip. This should be kept bright and clean and fresh tinning will keep it that way.
You should also buy some solder 'wick' with the iron; this is used to place on the solder you wish to remove and then heated with the iron. Properly used, the wick will absorb nearly all of the solder from the lands from which you wish to remove a component.
Avoid lingering too long on the soldered area since this can cause the trace's bond with the board to yield, lifting the trace.
Posted on Nov 26, 2008
Some Capacitor of your plasma is defective pl change as soon as possible If you can do it than do it or call engineer for this.
Posted on Jan 25, 2010
The tv power supply board is dead.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Posted on Jan 10, 2011
Do not turn this television on! Any electronic that smokes is NOT GOOD! The smoke and accompanying smell is from plastic and solder that is being melted by a short on one of the TVs logic boards. Call a local TV repair man this is not an issue you could fix yourself and will most likely be better off buying a new television. Stay away from off brands like these, spend the few extra bucks on a name brand like Sony, Toshiba, LG, or Samsung and you won't encounter these types of issues.
Posted on Feb 15, 2011
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May 27, 2015 | Cars & Trucks
Hi friend, thank you for your post!
I understand that your Frigidaire dishwasher is giving off an electric burning smell and you are seeing smoke coming out of the door vent. It could possibly be an issue with your control panel or door vent, both have electrical components inside of them. Since it could be either one of these underlying issues I would recommend having a technician come out to your home and diagnose and repair the dishwasher. Hope this helps. -Matt
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