I have a Samsung 214T monitor.
And it started suffering from what is a well known problem for these monitors.
The screen would flash and then go dark when you tried to power it up.
Like I said...fairly well known and the fix is to replace the cylinder capacitors on the power supply.

I swapped the 5 capacitors with new capacitors.
I made sure that the specs of the new matched the old.
There were 2 820u 25v and 3 330u 25v.
The solder points were clean and the polarity was correct.

Last night, after the fix, it worked perfect for hours before going to bed.
Today, when I got home from work, it would not even power up.
I took it back apart. The old capacitors had a slight bulge. The new ones I put in last night all looked fine.
I re-soldered the new ones to rule out a cold solder. I double checked and everything looks good.
Now however, when I plug it in, the little green power light dimly flashes and it will not do anything else.

I am at a loss.and although I can change a capacitor, I am not any type of expert on these things.
Anybody got any ideas as to what might be going on?

Thanks

2/23/2010 10:18:09 PM

Probably about time to buy a new (or new to you) one

2/23/2010 10:34:45 PM

Yeah..that might be.....but I would still love to find out what went wrong.
Was it what I did?..or did something else die in this thing?

2/23/2010 10:36:26 PM

Not to sound like a complete tard but have you checked to make sure that the outlet/surge protector/power strip is not complete poop and blowing up your capacitors?

2/24/2010 12:36:31 AM

take a photo of the bare pcb. can you run the monitor with the board exposed to check the temperature of some of the components? if you can snap a photo i can tell you what gets hot.

edit :
sorry. it sounds like you cant get it to power up period now. ripple current rating and temperature are going to be critical when selecting the input cap to a dc/dc converter.

[Edited on February 24, 2010 at 12:55 AM. Reason : .]

2/24/2010 12:46:46 AM

I am going to open the monitor up again tonight.
If there are any pics in particular that you need, I can take them then.

2/24/2010 7:05:08 AM