Samsung monitor 2493 HM steady blue light dead

[SolderTrouble]

Re: Samsung monitor 2493 HM steady blue light dead

I read this entire thread today because my Samsung 2493HM is experiencing the same symptoms (black display, solidly lit blue LED). I got the impression that ivtec didn't understand budm's advice regarding how to test power supply board voltages when the power supply board isn't connected to the main board. Specifically: temporarily connect a resistor between the PS-ON and STBY (standby) pins of the smaller of the two connectors normally cabled to the main board, to raise the voltage on the PS-ON pin. PS-ON is an input signal that the main board uses to tell the power supply board to turn on. When the main board isn't connected to the power supply board (or if the main board is connected but isn't working right or received feedback of a problem) then it doesn't supply 2.5Vdc to the PS-ON pin, which causes the power supply to only generate 5Vdc "standby" power (needed by the main board and by the blue LED). Connecting a jumper resistor from STBY to PS-ON will supply the signal needed to turn on the rest of the power supply voltages so they may be measured.

[budm]

Re: Samsung monitor 2493 HM steady blue light dead

The symptom shown on the youtube is very strange, they all have the same symptom. I wonder it was due to bad DCV feeding the main board or not. Glad it is working out for you and you did not give up.

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

Hi budm; i have good news, i opened up the monitor one more time and i went through some of the solders and found one bad solder on one of the caps re-solder it and reassembled it and for my surprise monitor is working again like new,as i stated all components all looked and tested ok,so it had to do with the hard glue and bad solders.Thanks budm for your patience and time, appreciate,this forum is the best.

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

Thanks budm the cap is 470 uf cause i have another one just like it and with my Fluke 87 i measure about 470uf, the 16T i would assume it's 16v.

Also this is the other video it's not my tv but it's exact the same symptoms. hope you can open it.


https://www.youtube.com/watch?v=5ulXm4Wix5k

https://www.youtube.com/watch?v=41ThS6hubdg


https://www.youtube.com/watch?v=NgBQI5Wnzi4


https://www.youtube.com/watch?v=NgBQI5Wnzi4

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

OK, it is working now. What did you change?
You are testing the cap that is still soldered to the board, other components connected in parallel with the cap may be giving you wrong reading.
The '470' can also mean 47uF, it depends on how manufacturer uses the numbering system. some may use '471' for 470uF (1 = multiplier of 10).
I am not sure about the first Video that shows color cycling.

Thanks budm the cap is 470 uf cause i have another one just like it and with my Fluke 87 i measure about 470uf, the 16T i would assume it's 16v.

Also this is the other video it's not my tv but it's exact the same symptoms. hope you can open it.


https://www.youtube.com/watch?v=5ulXm4Wix5k

[budm]

Re: Samsung monitor 2493 HM steady blue light dead

OK, it is working now. What did you change?
You are testing the cap that is still soldered to the board, other components connected in parallel with the cap may be giving you wrong reading.
The '470' can also mean 47uF, it depends on how manufacturer uses the numbering system. some may use '471' for 470uF (1 = multiplier of 10).
I am not sure about the first Video that shows color cycling.

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

This is what I see when I click on the link:
One account. All of Google.
Sign in to continue to YouTube.

Sorry budm but is there any other way i can post the video?


https://www.youtube.com/watch?v=NgBQI5Wnzi4


https://www.youtube.com/watch?v=csbeLRLHfKk

[budm]

Re: Samsung monitor 2493 HM steady blue light dead

This is what I see when I click on the link:
One account. All of Google.
Sign in to continue to YouTube.

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

Sorry budm i can see the video perfect,i don't know why this.Type; frank Silva inside YouTube that's my chan.

https://www.youtube.com/watch?v=csbe...ature=youtu.be

https://www.youtube.com/edit?video_i...m-upload_owner


https://www.youtube.com/edit?video_i...m-upload_owner

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

The Video wants me to sign in to see the video.
This is what I see when I click on the link:
The first link:

'This video does not exist.'
The second link:

'Content Warning
If the owner of this video has granted you access, please sign in.'

'The Fusivel resistor RB 8015 you mention is not 10 ohms but 33ohms'. i just check the board, you are correct, it is 33 Ohms not 10 Ohms.

Sorry budm i can see the video perfect,i don't know why this.Type; frank Silva inside YouTube that's my chan.

https://www.youtube.com/watch?v=csbe...ature=youtu.be

[budm]

Re: Samsung monitor 2493 HM steady blue light dead

The Video wants me to sign in to see the video.
This is what I see when I click on the link:
The first link:

'This video does not exist.'
The second link:

'Content Warning
If the owner of this video has granted you access, please sign in.'

'The Fusivel resistor RB 8015 you mention is not 10 ohms but 33ohms'. i just check the board, you are correct, it is 33 Ohms not 10 Ohms.

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

did you check the video i made about the the cap if the short is due to the 2 coils?

also The Fusivel resistor RB 8015 you mention is not 10 ohms but 33ohms

https://www.youtube.com/watch?v=csbe...ature=youtu.be

https://www.youtube.com/watch?v=NgBQI5Wnzi4 -

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

You can measure the DCV between the two legs of the cap, then you will have some idea what the Voltage rating of the cap will be.

did you check the video i made about the the cap if the short is due to the 2 coils?

also The Fusivel resistor RB 8015 you mention is not 10 ohms but 33ohms

https://www.youtube.com/watch?v=csbe...ature=youtu.be

[budm]

Re: Samsung monitor 2493 HM steady blue light dead

You can measure the DCV between the two legs of the cap, then you will have some idea what the Voltage rating of the cap will be.

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

Never mind after reading you r post 24. I thought you had already removed all the glues as suggested in the beginning.

The resistor is in parallel with the load so it will show <100K.
I would check out those semiconductors I marked.
Check those Resistor, Diode, Cap in the snubber network, see some glues there.
Check the fusible resistor, should be <10 Ohms.

Thanks budm; i checked those and they seem ok although the solders on these are not very good so i touched them up,

now i want your opinion on a SMt Cap 470uf 16T C3045 on the main board,between L600 and L902 see video. also on cap 470uf the 16T stands for 16v?

https://www.youtube.com/watch?v=csbe...ature=youtu.be


The Fusivel resistor RB 8015 you mention is not 10 ohms but 33ohms

[budm]

Re: Samsung monitor 2493 HM steady blue light dead

Never mind after reading you r post 24. I thought you had already removed all the glues as suggested in the beginning.

The resistor is in parallel with the load so it will show <100K.
I would check out those semiconductors I marked.
Check those Resistor, Diode, Cap in the snubber network, see some glues there.
Check the fusible resistor, should be <10 Ohms.

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

H guys new update on Samsung 2493 HM monitor.

Today i decided to reassemble power supply after taken out Cap 4pf 1KV
clean hard glue and re-solder it back also cleaned all other glue around all other caps,
and for my surprise i have tv on but with no controls and just a screen with switching back and forth between RGB ,white,and blue screen,with no controls on the front,just power on and of switch,see video,
what do you see of this? thanks in advance

Disregard the sound cause is from my tv.



https://www.youtube.com/watch?v=NgBQ...ature=youtu.be

I connected HDM i Cable and i have also sound

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

H guys new update on Samsung 2493 HM monitor.

Today i decided to reassemble power supply after taken out Cap 4pf 1KV
clean hard glue and re-solder it back also cleaned all other glue around all other caps,
and for my surprise i have tv on but with no controls and just a screen with switching back and forth between RGB ,white,and blue screen,with no controls on the front,just power on and of switch,see video,
what do you see of this? thanks in advance

Disregard the sound cause is from my tv.



https://www.youtube.com/watch?v=NgBQ...ature=youtu.be

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

Hi budm here some pics of my board and the resistors i'm talking about please help

Hi budm did you give up on my issue ,please give more advice,thanks

[ivtec]

Re: Samsung monitor 2493 HM steady blue light dead

Thanks again budm; i checked all those little caps and all of the others with my Cap Analyzer 88A and all check good ,
but i checked this SM resistor 104 that measures 4K it should be 100K next to C809 there is another 104 in same area that measure about 95K what is about right,i would post Board # of these SM resistors but they are hard to reed.

Hi budm here some pics of my board and the resistors i'm talking about please help