Re: Samsung Syncmaster 931BW - No Power
Hi Mike,
I got an automatic email saying someone had replied to this thread. Just so you know I still have the monitor in pieces under my bed, I couldn't resolve the problem despite getting the power board up and working.
Not sure what similarities the 931C and 931BW have but possibly we could possibly be looking at an identical problem.
Glennjamin
Member
Last Activity: 11-30-2011, 07:21 AM
Joined: 10-01-2010
Location: London, UK
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Re: Samsung Syncmaster 931BW - No Power
Hi again, I've been away for a week and unable to test. Update.
The output connector on the logic board does indeed have 4 pins and they test the following values:
Pin 1: 0 V
Pin 2: 1.8 V
Pin 3: 1.8 V
Pin 4: 2.1 V
I also own a Samsung 226BW which I pulled apart and borrowed the switch and connecting cable (which are the same). No surprises, no change...so the switch and cable are fine.
The two 1.8 readings shouldn't be that low should they?...Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
OK doing that is still giving me a very consistent 3.8V with absolutely no fluctuation. Do you know what the output voltage should be for the connector to the front power button? I'm not sure if that is important in this case though.Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Thanks for clarifying, I've attached a picture illustrating the values of the two regulators and their part numbers above each....Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
How would do that with my DMM, I'm still quite the novice 25 posts later this thread sorry! On 20VDC and the black & red probe on which points exactly? Thanks.Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Logic board pictures -
1. Full front
2. Full back
3 & 4. Close halves of front
5 & 6. Close halves of back...Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Thanks, it feels like some progress at least! I will do so in the morning when I have good natural light, I did already post one image which isn't too clear back on post #14 - [url]https://www.badcaps.net/forum/showpost.php?p=173789&postcount=14[/url]
Probably not too much you can gain from that but it does seem a fairly unexciting logic board.Re: Samsung Syncmaster 931BW - No Po...ready post oneLeave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Hello again!
I return having received my FPS and successfully replaced it on my powerboard. In doing so I rebuilt the monitor and turned it on...nothing again, no LED light around the power button.
I took it apart once again and did the test you recommended before on the output connector - originally showing no values. I now get values of about 13-14V on the 15V connector and about 5V on the 5.1V connector. So the powerboard seems to be back to life but the monitor isn't. Any ideas?...Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Searching DM0465R seems to have been more fruitful, I'll order one of these and post back to update the thread in the near future. Your help has been much appreciated!Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Right ok, thank you for the explanation. Before I started down this route I listened for ticking and never heard any which makes sense. I measured pin 2 and 3 over time (couple of minutes) and it was hugely consistent, only fluctuating 0.01V here and there. This leads me down the road to replace the IC. Searching "Fairchild Power Switch" on ebay yields varieties with only 4 or 5 legs (mine has 6), am I searching the correct term?
RE: caps, as I said in the first post I have now replaced all the caps on the board with...Last edited by Glennjamin; 07-07-2011, 05:21 AM.Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
10.70V between those two pins (GND and Vcc). Not sure what this means for the FPS.Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Pictures attached, did my best with artificial light as it's quite late here now. I hope you can make them out otherwise I will do them again in the morning.
RE: IC101, the writing on the side of it is as follows -...Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
OK the results for the large cap, tests at about 332V. So I assume that seems fine.
I can't get a reading whatsoever on the output connector. Black on GND, red on 1.5V pin or 5.1V pins (2 of them), nothing whatsoever.Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Heh, thank you for the quick run down, I do apologise for missing the word 'cap', I thought I had grasped the concept of capacitors. I guess not quite yet.
OK fine, I shall do that. To check I'm not being ignorant, I do this with the power board unplugged? I'm taking that default action for safety sakes, but I believe I may be wrong.
Understood. Yes near enough, 5.1V and 15V it says. I'll report back shortly, thanks again....Leave a comment:
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Re: Samsung Syncmaster 931BW - No Power
Thanks for the replies, pictures attached below (overall image of power board, then two closer pictures).
I live in London in the United Kingdom, PlainBill. Wikipedia says it's 230V here. Is that right?
1. This this the brown cylindrical component next to the mains adapter?
2. I see the mounting screw, but there seems to only be one power output (the white plug, top right corner of pic), is this OK?
Much of this is new to me but I'm enjoying learning, please bare with me!...Leave a comment:
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Samsung Syncmaster 931BW - No Power
Hi there,
I'm a little of a novice with this kind of thing but I've been doing a lot of reading here and other sites to get up to speed.
Got this monitor from a friend, no power at all when plugged in, no flashing power button light. Nothing! Opened up the monitor, the power board had 3 bulging caps. Replaced them, tested - no change. Replaced all the other caps (not bulging, with exception of the big 100uf 450v one), retested - no change.
Need some advice on what to check next? I'm not even certain if the power button works? What else should I look...
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