Samsung 2233BW - 2 seconds to black

[kanucks25]

Hi,

So all of a sudden my screen starts turning off with the power light still on. I did some research and found that it usually has to do with bad caps or a bad inverter. Turning down the brightness to minimum worked for a few days but now it randomly turns the brightness up by itself and immediately turns off.

I was going to open it up and take pictures of the inside for you guys but I couldn't get the case open. I was able to loosen the sides but couldn't get through the top or bottom. I'm kind of hesitant because I don't know how much force I can use and where exactly I can pry without damaging something inside.

Does anybody have experience with this specific model? I tried googling and youtubing it but didn't have any luck. Once I get it open I can upload pictures.

Thanks.

[budm]

Re: Samsung 2233BW - 2 seconds to black

http://s807.photobucket.com/user/bud...?sort=3&page=1

http://s807.photobucket.com/user/bud...tml?sort=3&o=4

If you do not have steady hand, use flat plastic or wood (I use screw driver) to lift up the bezel enough to get your fingers to pull up the bezel and then work around to get 3 sides loose then put it face down and then lift up the cover.

[kanucks25]

Re: Samsung 2233BW - 2 seconds to black

Here are the pics. Hopefully I covered everything and someone can pinpoint the problem

http://imgur.com/a/jmNJl

Thanks!

[kanucks25]

Re: Samsung 2233BW - 2 seconds to black

Bump?

[kanucks25]

Re: Samsung 2233BW - 2 seconds to black

Bump!

[kanucks25]

Re: Samsung 2233BW - 2 seconds to black

Bump

[budm]

Re: Samsung 2233BW - 2 seconds to black

I cannot read the P/N of the 8-pin SMD Power MOSFETs U202, U203 on the power supply-inverter board.
We need to check the resistance between the Drain pin and the Source pin to see if they show <100 Ohms resistance.

[momaka]

Re: Samsung 2233BW - 2 seconds to black

The power supply board looks like it has the main and standby supply all in one. But I can't tell for sure from the pictures you posted.

Can you take some shots of the whole power board in the picture? (both front and back sides).

As for the logic/video board - there doesn't seem much that can go wrong there. Only see some heat-discoloration around two regulators (1.8V in the TO-252 package and 3.3V in the SOT-223 package), which may not necessarily indicate any trouble.

Also, please attach pictures with the forum's built in feature.