Re: Samsung Syncmaster 245BW
Ugh, sorry! Once I put in the CM802 replacement and saw that the monitor suddenly began working, I tossed the old one out. Not that this is a good indicator, but on visual inspection, the old capacitor looked fine - no bulges or burn marks or other unusual marks. It was also solidly connected (I noted earlier in the thread that someone had a CM802 that was partly broken off their board).
Earlier, I did change the RM resistors as well, as one of them was definitely out of spec (I measured that one, earlier in this thread)....
nordhaus
Member
Last Activity: 11-08-2015, 01:46 AM
Joined: 04-04-2012
Location: Los Angeles, California
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Re: Samsung Syncmaster 245BW
All great tips from retiredcaps!
Yes, I tend to be a tool junkie, but I try to make purchases with other purposes in mind as well. My pry tools will also work well for some of my other hobbies/tasks. And I've been wanting a step up soldering iron for over a decade now (I don't even know the wattage setting of my old Radio Shack model, and I never liked using it). The Hakko was a pleasant surprise to use!
I also have 3 Samsung monitors of similar vintage, so I fully expect that at some point I'll be tearing into those too at...Leave a comment:
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Re: Samsung Syncmaster 245BW
Hi,
I was able to successfully able to repair my Samsung 245BW monitor recently. I replaced nearly all of the capacitors, replaced the problematic RM805, RM806, and RM807 resistors, and finally replaced the CM802 capacitor - all on the monitor's power board.
I've only had limited experience soldering, and even less so on any kind of circuit board. I made some mistakes along the way, and learned a few things, especially about the tools to use.
Here are some of the tool lessons I learned:
1) Taking...Leave a comment:
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Re: Samsung Syncmaster 245BW
Hi Guys,
Just wanted to give you a big thank you to all - I swapped out the CM802 capacitor, and BAM, got 24 volt readings on all 5 24-volt pins near the plug. Checked the monitor screen and got an image!
The monitor is working great now, and the image even seems a bit better! I was having some streaking near the top of the screen (it matched the corners of my windows and browser tabs, so I assumed it was an early burn-in), but now, all the streak marks are gone too!
Special thanks to jetadm123 and selldoor...Leave a comment:
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Re: Samsung Syncmaster 245BW
Hi,
Ok, so I got the CM802 Replacement from Digikey (a part referenced by PlainBill in another part of the thread) here:
[url]http://search.digikey.com/us/en/products/ECQ-E6183JF/P14550-ND/2567798[/url]
It is a Panasonic part, but looks quite a bit smaller than the blue chiclet cap it is replacing. The other issue is that there appear to be no polarity markings on this new one, nor on the blue original (both pictured), nor on the board itself.
The photo of my new cap (reddish brown) only has...Leave a comment:
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Re: Samsung Syncmaster 245BW
Thanks for that.
One more question.......two of the new capacitors are touching each other (they have a brand new coating). One of the caps is a bit larger than the one it replaced, and thus, in a crowded area, it is unavoidable that they are touching. Is this a really bad thing?
Thanks!
N~Leave a comment:
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Re: Samsung Syncmaster 245BW
Update:
Just ordered the CM802 and also the large 450V large capacitor (just in case) from Digikey.
Will update again when I get the goods and install them.
But I still have questions
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1) For these two capacitors, I looked at the backside of the board. Unlike the other smaller capacitors, the solder point looks different. The Capacitor wire seems to be ringed by 5 tiny prongs in the solder - is there some different sort of mounting/soldering system going on for these "heavier duty" capacitors?...Leave a comment:
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Re: Samsung Syncmaster 245BW
Here is a photo of the CM802 I could find (the blue chiclet). It looks to be marked 630V.
Is this the one? Doesn't look like a regular capacitor.........and where would I get this one?
Thanks!
N...Leave a comment:
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Re: Samsung Syncmaster 245BW
- Glue removed. Nasty stuff, that red glue.
- I saw a red rectangular block there (photo attached). Didn't look like a fuse, but I turned the board over and tested with the multimeter.....got a 0.2 ohm reading, which should be ok, right?
Thanks for your help!
N~...Leave a comment:
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Re: Samsung Syncmaster 245BW
Hi,
Ok, here are the photos of the Inverter board, per RetiredCaps request.
I don't see any 3-pin mosfets on this, but there were 4 mosfet-like items that had 4 pins. I tried testing them on the multimeter in various pin configurations, but got no readings.
Regarding fuses, I did see a small item that could be a micro fuse (very tiny, copper looking ends, small white body), near the connector pin.
Tested it on the multimeter and got a 0.2 ohm reading, indicating that the fuse is ok, right?...Leave a comment:
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Re: Samsung Syncmaster 245BW
Note: I did replace all 14 of my capacitors (not the big 850V one). Also replaced all of the three troublesome RB resistors.
Thanks for the tips jetadm123!
I reconnected logic board, power board and inverter. Reading 0 on all 24V pins. No joy.
Wow........what next? 850V capacitor?
N~...Leave a comment:
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Re: Samsung Syncmaster 245BW
Ok, stupid question time again......How and where do you measure for 24V?
I've done a search and theres plenty of references to 24V output (or lack thereof), but can't find any pointers or how-to style posts.
I do have a multimeter, so I can do it, if there is a how-to I am missing somewhere.
Thanks!
N~
P.S. CM802 looks like a square blue chiclet, and not like a traditional capacitor. Is that the one? The rating I read on it is also 18nf 630V, not 650....Leave a comment:
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Re: Samsung Syncmaster 245BW
Update: Ok, I replaced the 3 "usual suspect" resistors on my 245BW Power board (RB805, RB806, RB807), but no joy. Monitor still doesn't light up (blue light on power button remains lit, as before).
So I've moved on to replacing the 14 capacitors on my power board (except for the big 850V capacitor).
Will take a photo of the Inverter board when I get up in the morning.
Thanks!
N~Leave a comment:
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Re: Samsung Syncmaster 245BW
As a side note, I ran the multimeter on the 3 resistors I removed. 2 of them measured .068 and one of them measured .076.
I'm assuming that the variance might indicate an issue since all 3 resistors are the same.
(I'm a novice at reading and using the multimeter, so be gentle).
N~Leave a comment:
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Re: Samsung Syncmaster 245BW
Hi,
Ok, per retiredcaps request, here is a photo (again, done by "manage attachments") of the bottom of the power board.
[B]Please note that I've already removed the 3 resistors so don't mind the empty holes.[/B]
And while I have the sunlight, I took another photo of the top of the board, and tried to max out the photo in Photoshop, so here it is again (note again, the resistors are missing, as I just removed them).
Thank you!
N~Re: Samsung Syncmaster 245BW
...Leave a comment:
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Re: Samsung Syncmaster 245BW
Hi,
I DID use the "Manage Attachments" function and uploaded the photos to the board (hosted). The photos are hosted on the forum.
Secondly, my photos were each 4mb large in origin, so I had to cut them down a bit to meet the guidelines (which I DID READ).
Perhaps, you could give advice on what guidelines I DID miss? And I'd be happy to correct.
Thanks,
N~
P.S. If you click on the thumbnails I posted above, they will show the full size photo I...Last edited by nordhaus; 04-07-2012, 04:59 PM.Leave a comment:
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Re: Samsung Syncmaster 245BW
Hi,
I notice that the 3 resistors on my board have some kind of brown paste or adhesive on them that "holds" them together. (photo attached).
[ATTACH]38381[/ATTACH]
Three questions for you all:
1) Is this important to replicate (the adhesive) when I put the new resistors in? If yes, what do I use?
2) And, just for grins, I've also attached a photo of the power board - the capacitors look remarkably clean to my eye, anyway. Anyone disagree?
[ATTACH]38382[/ATTACH]...Leave a comment:
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Re: Samsung Syncmaster 245BW
Thank you!...Leave a comment:
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Re: Samsung Syncmaster 245BW
Stupid question time - I know about the polarity for Capacitors, but is there such a thing for the resistors?
Do the resistors have to be installed in a certain direction/orientation, or does it not matter?
And if yes, how do I tell which side is which (for the resistors)?
Thanks!
N~...Leave a comment:
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Re: Samsung Syncmaster 245BW
Thanks for the iron recommendations! Hakko on order (was always wanting a new soldering iron, and this is my excuse!).
So, would 60/40 (tin/lead) .032 diameter rosin core solder suffice for this job?
N~Leave a comment:
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