Samsung Synchmaster 2693HM WHITE SCREEN

[momaka]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

Yes they look okay to me as well.

Next, measure the voltages on these rails. For ground, you can use any metal part of the monitor's case.

[Chris02]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

Hi!

I hope that it is ok, that I'll post with my Problem in this thread too. If not tell me and I'll opend a new one.

I have got a 2693HM which starts only with a white screen. I knew before I read this thread, that my fault comes from T-CON board.

I already measured the resistances between the testpoint and their voltages:

VEEG 41,8k / 0,385V
VDDG 304 / 0V
VDDD 141 / 3,325V
VDDA 5,7k / 0V

5V supply voltage is ok.

And I can't find any blown tracks on the PCB.

I hope you have got also some tipps for me and we three can fix both monitors!

Regards
Chris

[momaka]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

I already measured the resistances between the testpoint and their voltages:

VEEG 41,8k / 0,385V
VDDG 304 / 0V
VDDD 141 / 3,325V
VDDA 5,7k / 0V

5V supply voltage is ok.

Resistances seem okay, but the voltages for VDDA, VDDG, and VEEG are all gone. Without VDDA, VDDG and VEEG won't come on either.
Measure the resistance for all of the small ceramic capacitors to the right of IC301 and IC302 (those RAM chips).
Since your board my be slightly different, it is advisable to post some pictures of your board. At this point, I would say open a new thread, just so that we don't confuse which member had which problem with their t-con.

[OncleOh]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

Sorry for too long delay.
Here are the readings:
VDDA 5,9K / 13,12V
VDDO 1,5k / 3,3V
VEEG 41k / 7V
VDDG 100k / 27,4V

Regards!
Leo

[momaka]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

Those readings seem good. Not sure what's wrong with the t-con then (if anything).
Just out of curiosity - was VEEG 7V or -7V when you measured it?

[OncleOh]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

@momaka
yes the VEEG is -7V, is these ok or wrong?

Regards!
Leo

[OncleOh]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

Hi,
i took a look at the pdf and the VEEG in -V so the T-con is ok.
Why then white screen?

Regards!
Leo

@momaka
yes the VEEG is -7V, is these ok or wrong?

Regards!
Leo

[momaka]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

The voltages are right.
My only guess would be if the video signals are somehow not getting to the t-con board or if the video/logic board is not sending any. That's a bit above my level of troubleshooting expertise, though.
Perhaps just check the other small ceramic caps for short circuit. If none, I don't know what else to suggest.

[OncleOh]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

@momaka
will check all the caps and let you know.
Thanks for now.

Regards!
Leo

[Chris02]

Re: Samsung Synchmaster 2693HM WHITE SCREEN

Everything about my fix of 2693HM you can find in this thread

OncleOh asked me if I can measure the testpoint from my working t-con board. Here are the calues of the working one.

Name of Testpoint Voltage / Resistance to GND
VDDG 27V / 100k
VEEG -7V / 41,5k
VDDA 13V / ~5,5k (it seems that the TP is connected to any C which charged while measuring)


I hope it will help anyone to fix much more 2693hm!


Regards from Germany
Chris