Samsung Syncmaster 245BW

[hycojoe]

Re: Samsung Syncmaster 245BW

Hello to All, I am a new user, so please excuse me as i get acquainted with the Blog. I am a general contractor, so usually when something breaks around me i use a hammer to fix it, and if that doesn't work, i get a bigger hammer! so, now you know what you are facing.
I have the same problem that i found in this blog with the same monitor. i performed all the steps that were prescribed here, but when i got to the 3 capacitors, they checked the correct ohms on the meter. i am sure it is probably another one, but i am not an electronics guy, but i can follow orders and pictures and would like to find some help with this monitor. i just can't bear to throw it away when it might just be something so small.
Can anyone advise me further?

Thank you,

Hycojoe

[budm]

Re: Samsung Syncmaster 245BW

First thing will be posting good clear pictures of YOUR power supply board both top and bottom side. What is your monitor not doing? No standby voltage or any other voltages on the power supply board, no LED lights, etc?

[hycojoe]

Re: Samsung Syncmaster 245BW

The monitor presents just as the one from the 2011 thread. The power button blinks when the computer is off, as it should, and glows solid when the computer is on. I run 3 monitors on my desk and this is my center, main one. When booted up, the mouse will roll from my left monitor to the far right monitor, through the center (blacked out) monitor just like it is there, but screen is black. The flashlight test produced nothing.
Can you instruct the proper way for me to post pictures to the blog? I have excellent Nikon photos of the three boards, both sides.

[budm]

Re: Samsung Syncmaster 245BW

How to post pictures: https://www.badcaps.net/forum/showthread.php?t=1868

[hycojoe]

Re: Samsung Syncmaster 245BW

Pictures of the 3 boards.

[budm]

Re: Samsung Syncmaster 245BW

Please see pictures

[hycojoe]

Re: Samsung Syncmaster 245BW

budm,
I will check the fuse. I have already checked the ohms on the 3 marked and each was in the 68 range. I will clean the glues and repost photos. Would closeups of those areas serve you better?
Thanks.
hycojoe

[hycojoe]

Re: Samsung Syncmaster 245BW

budm, ohm reading on that fuse is .000.
hycojoe

[budm]

Re: Samsung Syncmaster 245BW

OK, put the boards back in place, then set the meter to DC mode black probe on the metal chassis, red probe on the fuse of the Invreter board, it should have 24VDC on either ends of those fuse, you will have to have the monitor turn on and connected to a running PC.
I have a feeling that it has SMPS IC ICM801S (Black rectangular flat pack with multiple legs F9222L) sitting to the right of the transformer) for the 24v power supply section, it is very common failure part.
Also check the value of the cap CM802 as shown in this thread:
https://www.badcaps.net/forum/showth...22L#post172921

[hycojoe]

Re: Samsung Syncmaster 245BW

Photos of the caps requested without the glue.

[budm]

Re: Samsung Syncmaster 245BW

This is the CAP CM 802 that needs to check its value. So by the way, do you get the 24VDC?

[hycojoe]

Re: Samsung Syncmaster 245BW

Hey budm,
I have not put it back together yet. I am by no means an electronics technician, just a general contractor who usually uses big hammers to fix things. I know enough to probably be dangerous! Dad was an electrician after WWII and i learned basic electricity from him and i had an Aunt who worked for Bendix making submarine radios in the 50 and 60's and left me her toolbox, but at best i am a researcher who knows how to tinker. i will have to put the display back together to a point i can check the 24v. i read the link about checking the 802 but i am not sure how to proceed with that test. i may have to do more research on the net to understand exactly the terminology and directions from that post.
I do appreciate you helping me along. i just cant bear to throw this thing in a dumpster when it may be something so simple!
hycojoe

[hycojoe]

Re: Samsung Syncmaster 245BW

Got it back together and fired it up and checked the fuse. i am getting .000.

[budm]

Re: Samsung Syncmaster 245BW

I will be working on the board this Saturday, it has the same problem, no 24V. I will let you know what I find on this one.

[sh10453]

Re: Samsung Syncmaster 245BW

Greetings to all.
Such a wonderful site I found by chance, or by Google!!

My Samsung SyncMaster 245BW started to behave differently from what is being described in this thread.

It suddenly changed its display while I was viewing some of my photo albums as if a switch was pressed or flipped, where shady or darker color objects suddenly became black, and it has continued to be this way despite attempts to adjust monitor settings.

I can only see bright color objects / images, such as white, orange, pink, yellow, ..., etc..
I don't see most of the greens (as green). Most dark colors appear as black or very dark navy blue.

I am wondering if someone experienced would recommend where to start.
I have read the entire thread, but since my case is different, I am not sure if the issue here is the three resistors (or some of them).

I have not started opening the monitor (I have never opened it actually, and it might be a challenge by itself!).

I love the monitor and its picture (before this issue, obviously).
Any input that would lead me to resolve this issue would be greatly appreciated.

Thanks.

P.S. I have sufficient test instruments, soldering station, solder pump, etc., so no issues there.
_________________

[budm]

Re: Samsung Syncmaster 245BW

Follow-up, it was bad 18nF 630V cap CM 802.

[re-atari]

Re: Samsung Syncmaster 245BW

Yesterday I managed to save a 245B from the landfill. This one suffered, as many others, only from a defective 68R resistor. I replaced all three 68R resistors, just to be sure. They are so cheap (20c each), that there's simply no reason to cut corners. I did use types rated for 1W instead of the original 0.5W ones, however. CM 802 was OK, as were the electrolytic caps.

After fixing I tested the monitor the entire evening, and it ran without a hitch.

re-atari

[budm]

Re: Samsung Syncmaster 245BW

Just make sure to remove all the glue also.

[re-atari]

Re: Samsung Syncmaster 245BW

Just make sure to remove all the glue also.

Hi Budm,

Thanx for reminding me, had already thought of it and got rid of all that wretched stuff while I had the board on my workbench. As a rule of thumb I thoroughly clean any board that has this brown stuff on it. Thankfully Samsung used only moderate amounts.

By contrast I have seen other examples where components were (so to speak) bathed in this brown glue. As in a defective Aopen 300W ATX PSU I had intended to fix, the glue in that thing now looks like charred brown sugar. Probably beyond repair and not worth any more hassle.

re-atari

[Behemot]

Re: Samsung Syncmaster 245BW

Just for future generations, just resurected one with a new resistor. One of those three 68ohm was fully opened, since the glue was also on it's top, probably the electrode totaly coroded of under the glue.