Samsung 2493 HM issue

[zulururu]

Re: Samsung 2493 HM issue

Here are some more pictures !!
I wil do the voltage measurements in a few minutes !
Just in case you're wondering the 16 pins IC (ICM801) has a number on it :
MC33067p
CPDT0744G

[PlainBill]

Re: Samsung 2493 HM issue

Thank you all for your help ..... do you have any idea on how to do that ?? I'm really new at this !!

I will need a picture of the bottom side of the power supply. the picture of the top is excellent, something equivalent of the bottom would be helpful.

Also, ICM801? (the 16 pin IC) is the SMPS controller for the main supply. Pin 1 is in the upper left corner, and pins are numbered counterclockwise. Pin 4 is Gnd, I am interested in the voltages on pins 5, 9, and 15.

PlainBill

[zulururu]

Re: Samsung 2493 HM issue

Thank you all for your help ..... do you have any idea on how to do that ?? I'm really new at this !!

[PlainBill]

Re: Samsung 2493 HM issue

OK, I did some measurements as per
https://www.badcaps.net/forum/showthread.php?t=15796
Post number 9 by Plainbill and I have a different results:

With monitor turned On

Between pin 3 and 1: 0.02v
Between pin 3 and 2: 16.4v
Between pin 3 and 4: 1.08v
Between pin 3 and 5: 378V

With monitor turned Off

Between pin 3 and 1: 0v
Between pin 3 and 2: 14.88v
Between pin 3 and 4: 0.67v
Between pin 3 and 5: 160V

Any idea on what it means ??

Pin 1 is OCP (Over Current Protect). The change in voltage indicates the standby power supply is putting out more current.
Pin 2 is Vcc.
Pin 4 is the feedback (Indicates if the power supply output voltage is too low or too high).
Pin 5 is the startup voltage. The change in voltage indicates the PFC front end is working.

All of these readings indicate the standby SMPS, and the standby processor are working properly, and the signal to turn on the main power supply is being received by the power supply. Now it's time to troubleshoot the main supply.

PlainBill

[zulururu]

Re: Samsung 2493 HM issue

OK, I did some measurements as per
https://www.badcaps.net/forum/showthread.php?t=15796
Post number 9 by Plainbill and I have a different results:

With monitor turned On

Between pin 3 and 1: 0.02v
Between pin 3 and 2: 16.4v
Between pin 3 and 4: 1.08v
Between pin 3 and 5: 378V

With monitor turned Off

Between pin 3 and 1: 0v
Between pin 3 and 2: 14.88v
Between pin 3 and 4: 0.67v
Between pin 3 and 5: 160V

Any idea on what it means ??

[zulururu]

Re: Samsung 2493 HM issue

The input connector labelled Micom is labelled S_B on the output connector of the power supply and yes I have 5.21V on that one

[alexanna]

Re: Samsung 2493 HM issue

I could possibaly be wrong, but i think the pin Micom is the standby voltage?

[jetadm123]

Re: Samsung 2493 HM issue

In the link that alexanna provided, post #6, one of the pins on the connector is labeled S_B. I believe this is the standby voltage. It should read approx. 5V. Are you at least reading that?

[zulururu]

Re: Samsung 2493 HM issue

Thanks for the link !
I'll try to do some more troubleshooting

[alexanna]

Re: Samsung 2493 HM issue

Well, I have 3.2v on the Power en when the monitor in turned On, and 0v on the power EN when the monitor is turned off.
Maybe my last post is not really clear:
Power EN:3.22v/0v means monitor On:3.22v, monitor Off:0v

Thats a good thing,There is another thread tats describes you problem with some more things to test.If you can't find it i will try to add a link

https://www.badcaps.net/forum/showthread.php?t=15796

[zulururu]

Re: Samsung 2493 HM issue

Well, I have 3.2v on the Power en when the monitor in turned On, and 0v on the power EN when the monitor is turned off.
Maybe my last post is not really clear:
Power EN:3.22v/0v means monitor On:3.22v, monitor Off:0v

[dumpystig]

Re: Samsung 2493 HM issue

Hmm... that board really is dead

[alexanna]

Re: Samsung 2493 HM issue

The Power EN 3.2V is missing,that is what will request the 5.3V and 24 V. to turn on
at this point I am not sure why its missing

[zulururu]

Re: Samsung 2493 HM issue

Here is the measurements I did on the connectors going to the logic board:
With the monitor switched ON/Switched Off:

24v Det: 0.12v/0.01v
pwm dim: 0.06v/0v
Brt_ctl:0.06v/0v
A_dim:0.13v/0v
Bl_en:0.11v/0v

NC:0v/0v
NC:0v/0v

5.3v:0.26v/0v
5.3v:0.26v/0v
GND:0/0v
GND:0/0v
GND:0/0v
+18v:0v/0v
+18v:0v/0v
+18v:0/0v
GND:0v/0v
GND:0v/0v
GND:0v/0v
+5v Micom: 5.21v/5.21v
Power EN:3.22v/0v

[alexanna]

Re: Samsung 2493 HM issue

Should I leave the logic board unplug for the measurement ? I will check that tomorrow and let you know...
As I recall the 2 caps top seems flat view from the side.
Thanks again !

Every thing hooked up

[zulururu]

Re: Samsung 2493 HM issue

Should I leave the logic board unplug for the measurement ? I will check that tomorrow and let you know...
As I recall the 2 caps top seems flat view from the side.
Thanks again !

[alexanna]

Re: Samsung 2493 HM issue

Apparently this Power supply is also used on the samsung 245BW and 245B...
http://cgi.ebay.com/Samsung-2493HM-2...-/170619669136

That's what I thought.
There are 3 threads open on this P/S now.
On the connector going to the logic board, there should be a p/s on and a 5.3v. Pins
I don't know for sure if 24v is on that connector but if it is measure it.
What voltages do you measure?
Do the 2 capacitors near that connector appear domed to you?

[zulururu]

Re: Samsung 2493 HM issue

Apparently this Power supply is also used on the samsung 245BW and 245B...
http://cgi.ebay.com/Samsung-2493HM-2...-/170619669136

[zulururu]

Re: Samsung 2493 HM issue

I am working tonight, so I don't have the board in front of me but according to the picture it's BN44-00195A.
Thank you very much for your time !!!

[alexanna]

Re: Samsung 2493 HM issue

Whats the number of th power supply BNxxxxxxx?