Samsung 2233sw Power on then off

[Sniper82]

Been looking over the forums and have found some with similar issues. My 2233sw powers on fine for 2 secs then off, light stays on but if I leave the monitor it remains the same. I get image with a flash light on the screen. This guy has similar issues and changing the inverter worked for him. But his was going off/on ever 20 or so secs where mine doesn't. Should that be the first thing to change? He has the exact power supply I have.

https://www.badcaps.net/forum/showthread.php?t=12121

EDIT:
Just found this link and changing a couple caps fixed his. Gonna try this first since its cheaper:
https://www.badcaps.net/forum/showth...Samsung+2233sw

[PlainBill]

Re: Samsung 2233sw Power on then off

Been looking over the forums and have found some with similar issues. My 2233sw powers on fine for 2 secs then off, light stays on but if I leave the monitor it remains the same. I get image with a flash light on the screen. This guy has similar issues and changing the inverter worked for him. But his was going off/on ever 20 or so secs where mine doesn't. Should that be the first thing to change? He has the exact power supply I have.

https://www.badcaps.net/forum/showthread.php?t=12121

EDIT:
Just found this link and changing a couple caps fixed his. Gonna try this first since its cheaper:
https://www.badcaps.net/forum/showth...Samsung+2233sw

The problem described is 'two seconds to black'. Bad caps are one possible cause. I suggest performing a few simple tests before recapping unless there are obviously bad caps.

If there are bad caps, the usual recommendation is to replace all caps (with the exception of the large (100 uF, 450 volt one) with low ESR name brand caps. My preference is Panasonic FM, FR, or FC series. Nichicon, Rubycon and United Chemicon have equally good caps for this purpose.

PlainBill

[Sniper82]

Re: Samsung 2233sw Power on then off

Caps look good but like you said in another thread, doesn't mean they are. In the process of changing some of the caps.

[Sniper82]

Re: Samsung 2233sw Power on then off

replaced caps with no luck. I had a PSU from a different LCD that I was able to hookup to test the ccfl's. They came on and stayed on with it. So I guess that rules those two. I am reading some threads about testing the inverter and have tried with a multimeter but not sure I am doing it right. This is what I am getting:

P301 to P302 = OL
P301 to P303 = OL
P301 to P304 = OL
P302 to P303 = jumps around from .2 to .4
P302 to P304 = fluctuates 8k+
P303 to P304 = fluctuates 8k+

S301 to S302 = 1.161k
S301 to S303 = .192
S301 to S304 = .192
S302 to S303 = .192
S302 to S304 = .192
S303 to S304 = .898

I might not be testing it right but went in the order showing in post #18 in this thread.

https://www.badcaps.net/forum/showthread.php?t=12121

[PlainBill]

Re: Samsung 2233sw Power on then off

replaced caps with no luck. I had a PSU from a different LCD that I was able to hookup to test the ccfl's. They came on and stayed on with it. So I guess that rules those two. I am reading some threads about testing the inverter and have tried with a multimeter but not sure I am doing it right. This is what I am getting:

P301 to P302 = OL
P301 to P303 = OL
P301 to P304 = OL
P302 to P303 = jumps around from .2 to .4
P302 to P304 = fluctuates 8k+
P303 to P304 = fluctuates 8k+

S301 to S302 = 1.161k
S301 to S303 = .192
S301 to S304 = .192
S302 to S303 = .192
S302 to S304 = .192
S303 to S304 = .898

I might not be testing it right but went in the order showing in post #18 in this thread.

https://www.badcaps.net/forum/showthread.php?t=12121

You do remember I suggested making some tests BEFORE changing any caps, don't you? Perhaps now you will listen to some advice.

Note the picture attached to this post. Measure the resistance from S1 to S2. Write it down. Measure the resistance from S3 to S4. Write it down. Compare the two. If they differ by more than 3%, the transformer is bad.

Next, what what brand and series of capacitors did you use as replacements?

PlainBill

[flyingengineer]

Re: Samsung 2233sw Power on then off

You do remember I suggested making some tests BEFORE changing any caps, don't you? Perhaps now you will listen to some advice.

Note the picture attached to this post. Measure the resistance from S1 to S2. Write it down. Measure the resistance from S3 to S4. Write it down. Compare the two. If they differ by more than 3%, the transformer is bad.

Next, what what brand and series of capacitors did you use as replacements?

PlainBill

Hello!

This is my first post to the forum so I hope I'm following the rules. I have the exact monitor (Samsung 2233SW) with the exact problem (any time there is a signal change, the display flashes for about 2-3 seconds then remains off). I have replaced the 1000uF (x2), 330uF and 820uF (x3) caps with no change. I also found a cheep controller board on Ebay thinking that was the other option (before I found this excellent forum)...installed it...no change.

Just tonight I followed your advice and measured the resistance as you indicated in the picture linked above. It looks like there is a significant variation between the two measurements (~19%), so I suspect the inverter is bad.

So, on to my question...I've not replaced an inverter before and I'm hoping you have some suggestions on how to select one for purchase and a few tips for the install. I will try to post a close up pic of the model information. In case I'm not allowed to do so yet (too noob) the text is: (line 1) TM-0815 (line 2) TNE 0848 D T

First off, are there other tests I should do before I buy a new part? If I end up needing to get a new one, do I need to find the exact match or is there another similar option? It will probably be obvious with a new part but which of the pins do I need to de-solder?

Thanks in advance!

[Rtech]

Re: Samsung 2233sw Power on then off

based on your Resistance readings,you need to replace the Transformer.You need the exact one by Part number which you have noted.You need not do any other tests.AS you indicate you can see which pns to unsolder when you get a new one.Ebay is a source for the part sometimes,as is http://www.lcdparts.net/T.aspx

[Lumberjack777]

Re: Samsung 2233sw Power on then off

Like Rtech said....Ebay is a good source. I posted a link. The first 2 are from China and would take a few weeks for delivery. The 3rd one down is from the USA and is 2 dollars more; but you'll probably have it within a week.
http://www.ebay.com/sch/i.html?_saca...M-0815&_sop=15

[flyingengineer]

Re: Samsung 2233sw Power on then off

Excellent stuff guys, thanks! I've got one on the way. I'll post with the results once I've tested it.

Thanks again.

[flyingengineer]

Re: Samsung 2233sw Power on then off

Received the transformer yesterday...installed today, and voila'! All FIXED!! I'm using the monitor as I type this. Thank you for all the great advice!! I'll be sure to come back here for my next project!

[Lumberjack777]

Re: Samsung 2233sw Power on then off

Received the transformer yesterday...installed today, and voila'! All FIXED!! I'm using the monitor as I type this. Thank you for all the great advice!! I'll be sure to come back here for my next project!

Excellent news! Thanks for the feedback!