Capacitor help

AyashiKaibutsu

Diamond Member
Jan 24, 2004
9,306
4
81
So my dad was ready to throw away a decent LCD TV, and I figured for something to do I'd try to repair it. It gets fuzy along a patch of veritical space and the fuziness gets worse until it's a solid line; It seems pretty random when it happens. From reading online, it seems that vertical line problems are from the capacitors so I took it apart and found the board that controls power (has all the capacitors on it). I found some guides on replacing capacitors that I'll try to follow, but I don't know where are good places to order the parts. Google found some sites of course, but I'd like some opinions on good places.

Also one of the capacitors is glued to the board. I figure I could take the soldering iron or maybe a hot glue gun and melt the glue off. The way it's positioned I can't read what voltage/capacitance is on it only the part number and was wondering if there was a way to find what it is from that (number is T0421 and it's a rubycon YXG series). Googling didn't help with this. I'm borrowing the tools for it so I kind of want to know what it is before I start messing with removing the capacitors.
 

Modelworks

Lifer
Feb 22, 2007
16,240
7
76
The capacitor glued to the board could use either a plasticized glue or hot glue.
The latest electronics mainly use hot glue as the former stuff is very hard to remove.

The T0421 number is probably a lot number.

You need to make sure all the capacitors are discharged before you start soldering on them. Use a meter set for DC to check that they still don't hold a charge.
When replacing them make sure that you put them in correctly.
Reverse the polarity on a polarized capacitor and it WILL explode or at the very least leak all over the board.

Get some desoldering braid/wick to help with part removal.

Vertical problems in crt are usually capacitor related, not so sure about it being the cause of the problem in a lcd tv.

The problem is random so I doubt its capacitor related.
I think I would check the set for cold solder joints and cracks .
Use a strong light and magnifying glass to see joints that might have problems from the constant heating/cooling cycles a set goes through.