Samsung Syncmaster 245BW

[kmoonen]

Re: Samsung Syncmaster 245BW

8.12VDC , And 8.10VDC

[retiredcaps]

Re: Samsung Syncmaster 245BW

How do i measure the voltage of the 2 diodes ?.

It is most likely a 3 pin diode that looks like this

-><-

Put your black probe on a ground screw. Put your red probe on the middle pin. You should get a DC voltage reading.

[kmoonen]

Re: Samsung Syncmaster 245BW

How do i measure the voltage of the 2 diodes ?.

[kmoonen]

Re: Samsung Syncmaster 245BW

I will get aound to getting all those reading a little later today .. I do have voltage across the 24v , but it is only 8.6 volts...
even with the inverter disconnected still 8.6 volts

[alexanna]

Re: Samsung Syncmaster 245BW

1) What brand and series are the replacement caps?

2) What is the DC voltage across the legs of CM851 and CM852?

3) Just above CM851 and CM852 are two diodes mounted on heatsinks. What are the DC voltage on these diodes?

4) CN803 shows a legend with 5 pins marked as 24V DC. Are these pins showing 24V DC?

5) If you disconnect the inverter board from the power supply board, does CN803 measure 24V DC?

Don't forget to see retiredcaps above post.
Here is another thing you can check, if my memory is correct the capacitor I have circled in red is a known failure item and if it is bad you will have stand by voltage but you will lose the 24v rail.
Chances are you will see no obvious failure, but if you remove it from the board you may notice slight burning on the pins.

[retiredcaps]

Re: Samsung Syncmaster 245BW

1) What brand and series are the replacement caps?

2) What is the DC voltage across the legs of CM851 and CM852?

3) Just above CM851 and CM852 are two diodes mounted on heatsinks. What are the DC voltage on these diodes?

4) CN803 shows a legend with 5 pins marked as 24V DC. Are these pins showing 24V DC?

5) If you disconnect the inverter board from the power supply board, does CN803 measure 24V DC?

[kmoonen]

Re: Samsung Syncmaster 245BW

Here are the pictures . all of the caps on the entire board were replaced, and rechecked to make sure all were correct, as well as the 3 resistors that commonly are a problem (RB805, RB806 and RB807)

[Toasty]

Re: Samsung Syncmaster 245BW

Welcome!

There are several threads involving this display. Use the search for 245BW.

Please identify the part numbers for the power supply board and inverter. BN44-???? etc.

Toast

[retiredcaps]

Re: Samsung Syncmaster 245BW

See the instructions below on how to post top down view pictures of your boards. Please follow the instructions below exactly.

The cause of your low voltage (9V) could be bad caps.

[kmoonen]

Hi There

I have a Samsung Syncmaster 245BW, I have 8,96 volts coming from the 24 volts that powers the inverter. Black Screen, blue power light turns the power on and off, but no backlight...

Ken