Question about ViewSonic N3250W Television
Replacing caps is not hard unless you don't know how to solder. Then it becomes rather easy to cook the new caps or the board.
First you need screwdrivers etc to get inside the case and get everything apart. Bad caps used in power sections will either bulge or leak. The top will budge out/up slightly. Normally they will be flat or slightly indented. They are cheap so the usual practice is to replace all of the power section caps in one go. If the power fluctuated enough it can have damaged the rest so if you just replace the bad caps you may get it all running and have one of the 'good' ones fail a little while down the road.
So the first thing you do is mark the cap out and make a shopping list of what you need. Caps are rated in farads and volts. You can;t change the farads or micofarads for these and you can only use the same or greater volt rating never down. So if they are the same physical size then the solder pads will line up and thats the last thing to match up.
To remove them you need a soldering iron and solder wick (aka solder braid) and sometimes solder. You place fresh solder wick on the solder pad of the part, place the hot iron on it and as it heats both wick and solder the solder moves into the braid.You move the the other side and repeat. At this point it should move or be loose. Sometimes when they are stubborn you have to apply solder then desolder. This helps flow the solder out. Eventually it will come off. And repeat as required for the rest of the caps. If you do a video search for desoldering (google, bing, youtube) you should find one that shows this technique in a bit of detail. Surface mount stuff is not hard just different to do.
To solder them is quite easy. Clean the pads free of solder using more braid. The solder one pad. Place the cap on top (making sure its polarity is the right way) heat the solder, make sure the cap is in the right spot so it touches both pads and remove the heat. When the solder cools you just apply solder the the other pad and that should be it.
The soldering iron should be no more than a 15w with a grounded tip. The tip shape can either be a fine/small chisel or a needle point. Solder has to be electronic solder and fairly fine.
A pair of tweezers or forceps is handy. And you want lots of light.
As far as a schematic I can't help you with that. Not sure one is even available for this unit. I won;t say that you shouldn;t attempt this as it is a fairly simple job but if you can get some piece of junk board and practice pulling the parts off and putting them on. Then you won;t be getting up to speed on the good stuff.
Posted on Sep 10, 2010
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Posted on Jan 02, 2017
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