Samsung 2493 HM issue

[zulururu]

Re: Samsung 2493 HM issue

Thank you Plainbill, I will measure that, also my DMM doesn't have capacitance function, I discovered I have one at work I can use which has capacitance function, should I use that one instead ? If yes, to measure capacitance, should I desolder CM812 or there is no need for it ??

[PlainBill]

Re: Samsung 2493 HM issue

After more than a month, I've finally received my SMPS controller ... but after installation, unfortunately, my monitor is still not working .... I still don't have 5.3v or 24v ....
Do you have anymore suggestion ?

Darn!!! I had temporary access to another BN44-00195A and made some measurements with the supply operating. Here is the comparison. As you can see, they are very similar. Unfortunately, I did not make measurements on other points on the board, and no longer have access to that supply.

Pin Yours Other one
1: 5.05v / 5.08V
2: 5.05v / 5.08V
3: 2.54v / 2.55V
4: 0.00v / 0.00V
5: 5.08v / 5.11V
6: 0.07v / 0.07V
7: 0.07v / 0.07V
8: 5.04v / 5.08V
9: 14.60v / 11.90V
10: 0.00v / 0.00V
11: 0.19v / 0.19V
12: 14.06v / 11.30V
13: 0.00v / 0.00V
14: 0.27v / 0.25V
15: 15.06v /12.2V
16: 5.04v / 5.07V

The next thing to test is CM812. I know your DMM does not have a capacitance function, so pull CM812, set your DMM to the 20 Megohm range, and touch the probes to the cap. You should get a reading that increases, eventually going open.

PlainBill

[zulururu]

Re: Samsung 2493 HM issue

After more than a month, I've finally received my SMPS controller ... but after installation, unfortunately, my monitor is still not working .... I still don't have 5.3v or 24v ....
Do you have anymore suggestion ?

[zulururu]

Re: Samsung 2493 HM issue

Ah ok Thanks Alexanna !
I ordered an SMPS controller on August 19th apparently, it's coming from Australia and I still did not receive it, so as soon as I install it, I will let you know if that worked, if not, I will try to check that capacitor !
Thanks for the heads up though !
Cheers,

[alexanna]

Re: Samsung 2493 HM issue

Is it a question for me ?? if yes, my DMM doesn't have a capacitor range .....sorry !

Not exactly, I got the threads mixed up.
I am not really sure where you are on you monitor, I guess the point I was trying to make was there have been several failures of that capacitor. It sure wouldn't hurt to check the capacitance of it, and if the equipment on hand is unable to test it, I tried to give several suggestions on how to get it tested without spending a lot of money.

[zulururu]

Re: Samsung 2493 HM issue

Is it a question for me ?? if yes, my DMM doesn't have a capacitor range .....sorry !

[alexanna]

Re: Samsung 2493 HM issue

The monitor I had where that capacitor failed was the BN44-0173 Board, there was no obvious bloating or burning on the outside of the cap. After removal from the board there was some very slight discoloration of one of the pins where it went into the plastic, it was very hard to see.
If your meter does not have a capacitance reading ability, and buying a new meter is out of the question.
There would be nothing wrong with having someone checking it for you, any heating air condition technician, or if you have small local hardware store ask them to help you out, I would suspect the cost to be minimal if any.

[PlainBill]

Re: Samsung 2493 HM issue

On mine it's written on the top:
12 NJ 630v
some kind of a reversed "C" 4 MMKP
On the side of it I can read:
PILKOR
WK0747

I hope this help !

Yes, it does. Thank you. Pilkor is the manufacturer, it's a 12nF, 630V, 5% cap.

Now, the $64 question: Does your DMM have a capacitance range? This cap has an equivalent in the BN44-0173A power supply, and is known to fail.

PlainBill

[zulururu]

Re: Samsung 2493 HM issue

On mine it's written on the top:
12 NJ 630v
some kind of a reversed "C" 4 MMKP
On the side of it I can read:
PILKOR
WK0747

I hope this help !

[PlainBill]

Re: Samsung 2493 HM issue

Hello all,

Just to let you know that I still didn't receive my SMPS controller, so taht's why I didn't update that post yet ! It should arrive soon hopefully !

Thanks for the information. We're waiting to find out if that will fix it.

On a related subject, what is printed on the cap labeled 'Long Blue Cap' in the attached picture?

PlainBill

[zulururu]

Re: Samsung 2493 HM issue

Hello all,

Just to let you know that I still didn't receive my SMPS controller, so taht's why I didn't update that post yet ! It should arrive soon hopefully !

[PlainBill]

Re: Samsung 2493 HM issue

Analogy with common power supply failure like 245BW. (when you don't figure it out, excalate the problem, search document findings, etc.

You were referring to the BN44-0173A power supply. This is a BN44-00195A supply. The standby SMPS controller in the BN44-0173A derives startup power through a series of resistors. The standby SMPS controller in the BN44-00195A is an integrated design, and is connected directly to the rectified mains voltage; it derives startup power internally. What is more, it is working, and the main SMPS controller is receiving power.

PlainBill

[pamr4]

Re: Samsung 2493 HM issue

'De Nada.'

Now could you explain what you were referring to in your post #45? I've been going round and round these supplies, and between the lack of a schematic, obscured traces, inadequate test gear, and obtuse datasheets, it's been difficult to figure out where the actual failure lies.

PlainBill

Analogy with common power supply failure like 245BW. (when you don't figure it out, excalate the problem, search document findings, etc.

[PlainBill]

Re: Samsung 2493 HM issue

Sorry for missing that PlainBill.

'De Nada.'

Now could you explain what you were referring to in your post #45? I've been going round and round these supplies, and between the lack of a schematic, obscured traces, inadequate test gear, and obtuse datasheets, it's been difficult to figure out where the actual failure lies.

PlainBill

[pamr4]

Re: Samsung 2493 HM issue

Sorry for missing that PlainBill.

[PlainBill]

Re: Samsung 2493 HM issue

Please confirm that the big cap is 82micro. If it is, measure the voltage across the legs of the cap (10 sec) and post reading.

Already done. Note the results in post 21.

PlainBill

[pamr4]

Re: Samsung 2493 HM issue

Please confirm that the big cap is 82micro. If it is, measure the voltage across the legs of the cap (10 sec) and post reading.

[zulururu]

Re: Samsung 2493 HM issue

Excellent ! I just ordered it for 5.8USD postage include !
I will let you know if that fixed it !
Thanks you again !

Gilles

[PlainBill]

Re: Samsung 2493 HM issue

I shorted my DMM probe and I read 0.4 ohm but I realised I made a mistake when I gave you some value of 4 ohms, it was a misreading and was actually 0.4 ohm ! Sorry about that !

I measured all the resistors around the big capacitor, here are the results:

RB801 reading 100060 OHMS vs colour code 10*10000 +/-5% OK
RB802 reading 97600 OHMS vs colour code 10*10000 +/-5% ok
RM801s reading 32.7 OHMS vs colour code 330 /10 ok
RM801 reading 0.6 OHMS vs colour code 228*0.1 problem ?
RB808 reading 2.4 OHMS vs colour code 2OHMS OK
RB803 reading 47.4 OHMS vs colour code 47 OHMS OK

Do you think the problem I have with RM801 is ue to my cheap DMM ?

My goal if possible is to find the exact faulty component so I guess I will order a MP33067P, I found one here:

http://www.futurlec.com/cgi-bin/sear...earch=MC33067P

for 2$ + 4$ shipping, can you confirm that's the right one ??
If yes, I will order it, the shipping will take 2 weeks !!

Thanks you all for your help

That's the one. Congratulations on finding it at a very reasonable price.

PlainBill

[zulururu]

Re: Samsung 2493 HM issue

I shorted my DMM probe and I read 0.4 ohm but I realised I made a mistake when I gave you some value of 4 ohms, it was a misreading and was actually 0.4 ohm ! Sorry about that !

I measured all the resistors around the big capacitor, here are the results:

RB801 reading 100060 OHMS vs colour code 10*10000 +/-5% OK
RB802 reading 97600 OHMS vs colour code 10*10000 +/-5% ok
RM801s reading 32.7 OHMS vs colour code 330 /10 ok
RM801 reading 0.6 OHMS vs colour code 228*0.1 problem ?
RB808 reading 2.4 OHMS vs colour code 2OHMS OK
RB803 reading 47.4 OHMS vs colour code 47 OHMS OK

Do you think the problem I have with RM801 is ue to my cheap DMM ?

My goal if possible is to find the exact faulty component so I guess I will order a MP33067P, I found one here:

http://www.futurlec.com/cgi-bin/sear...earch=MC33067P

for 2$ + 4$ shipping, can you confirm that's the right one ??
If yes, I will order it, the shipping will take 2 weeks !!

Thanks you all for your help