Samsung syncmaster 245BW no power at all

[moneyfairy]

My Samsung monitor died the other day, made a kind of cracking noise then shut off in the middle of a game. The power LED doesn't light up at all, and the screen doesn't come on at all either. Tried all the basic stuff, different cord outlets all that. I saw some youtube videos and replaced some of the capacitors that looked like they were bulging a little. Still nothing though, so thought i would come here and see if anyone had any ideas. I can post pictures just let me know what parts you need pictures of. Thanks a ton

[Pentium4]

Re: Samsung syncmaster 245BW no power at all

Were they CapXon? Replace ALL the capacitors. A lot of the little caps with no vents tend to dry out and stop working, also check the big cap for electrolyte leaking out the bottom.

Pictures help

[moneyfairy]

Re: Samsung syncmaster 245BW no power at all

The capacitors were all Samwha capacitors.

[Pentium4]

Re: Samsung syncmaster 245BW no power at all

First off, check the fuses. Or maybe the startup cap is bad, usually 47uF 50V.

[ben7]

Re: Samsung syncmaster 245BW no power at all

The crack sound means something went pop for sure. Look at the transistors on the heatsinks for signs of failure - cracks in the plastic, a white spot, or burn/soot marks. Also check resistors. Take a look at any ICs on the bottom of the board, and see if they are burnt/cracked. Hope this helps!

[moneyfairy]

Re: Samsung syncmaster 245BW no power at all

i have visually inspected the boards really thoroughly but haven't been able to find anything unusual. I ordered all new resistors and some new fuses. I also attached some pictures.

[budm]

Re: Samsung syncmaster 245BW no power at all

Make sure to remove those yellow/brownish color glues.

[ben7]

Re: Samsung syncmaster 245BW no power at all

Before you possibly waste new fuses, test the resistance across the big 450v filter capacitor.

[moneyfairy]

Re: Samsung syncmaster 245BW no power at all

Alright i will try getting all the glue stuff off, and pick up a multimeter to test the big cap and some of the resistors.

[euromatlox]

Re: Samsung syncmaster 245BW no power at all

Google using the board code, BN44-00173A. You will find lots of help. Typical failure is that one of the three 68 ohm resistors is burned. Usually replacing all three resistors and some capacitors will do. Check also the other similar type resistors, I remember once replacing also 100k or 150k resistor (don't remember) too. There is a nice video on youtube about how to fix (I have some comments there also).

http://www.youtube.com/watch?v=PCn_aG36Jt0

[budm]

Re: Samsung syncmaster 245BW no power at all

Lots of that here:
https://www.badcaps.net/forum/showth...syncmaster+245

[moneyfairy]

Re: Samsung syncmaster 245BW no power at all

I got a little cheap (non digital) multimeter from a friend. Tested all the capacitors with the resistance setting. They all show open except 2 of them, they show that they have quite a bit of resistance. Could this be whats causing the problem?

[budm]

Re: Samsung syncmaster 245BW no power at all

I read the thread, did the two fuses also blow?

[moneyfairy]

Re: Samsung syncmaster 245BW no power at all

The fuses dont look like they blew but when i use the multimeter it says there's no current going through them. Which i did order new fuses (hopefully the right ones).
This is the link to the fuses i ordered..
http://www.mouser.com/ProductDetail/...MgJi7OAr9W0%3d

[budm]

Re: Samsung syncmaster 245BW no power at all

What resistance do you get when you measure the fuses using the lowest Ohm mode setting on your meter? No power applied to the board while testing the resistance.

[moneyfairy]

Re: Samsung syncmaster 245BW no power at all

Nothing, it doesnt show anything is going through them.

[budm]

Re: Samsung syncmaster 245BW no power at all

Here is the diagram for the board.