Screen white Samsung LE37B550A5W

[Nawual]

Hi!.We have this tv for repair with the white screen and i can see the menu a little under.
Any idea?.THanks and regards

[budm]

Re: Screen white Samsung LE37B550A5W

It sounds like it has GAMMA Voltage probelm on the T-CON board due to bad GAMMA Vref. IC.
Can we see the screen shot of the image you are seeing? Also the pictures of the T-CON board.

[Nawual]

Re: Screen white Samsung LE37B550A5W

Ok,the sound works and this the pictures:

[budm]

Re: Screen white Samsung LE37B550A5W

The SMD is on the bottom left of that T-CON board, it may be AS15 or AS19, I cannot read the number from your pictures.

[Davi.p]

Re: Screen white Samsung LE37B550A5W

Replace as15 chip, many videos on youtube.

[Nawual]

Re: Screen white Samsung LE37B550A5W

It´s a AS15,how can check it?.Thanks

[Davi.p]

Re: Screen white Samsung LE37B550A5W

Don't check it, change it, resolution 100%

[Nawual]

Re: Screen white Samsung LE37B550A5W

But i would like to learn how i can check if its fail.

[diif]

Re: Screen white Samsung LE37B550A5W

But i would like to learn how i can check if its fail.

Putting "gamma test" into the search box at the top of the page will reveal many threads detailing the procedure.

[Nawual]

Re: Screen white Samsung LE37B550A5W

Ok,thanks!.

[Nawual]

Re: Screen white Samsung LE37B550A5W

Hi again.
With the TV turned on and the antenna connected I have taken these measurements, some VG are missing:
VG1=15,25v
VG2=14,96v
VG4=12,48v
VG6=10,87v
VG8=9,99v
VG10=8,82v
VG11=8,57v
VG12=7,60v
VG13=7,89v
VG15=5,56v
VG17=4,66v
VG19=3,15v
VG21=0,60v
VG22=0,30v

V1D2=1,20v
VGHC=27,11v
VGL=-5,9v

[diif]

Re: Screen white Samsung LE37B550A5W

As suspected, they don't look like right.

[Nawual]

Re: Screen white Samsung LE37B550A5W

Where do you see the irregularities?, In which VG?.
I am a newbie and I want to learn to recognize this fault

[diif]

Re: Screen white Samsung LE37B550A5W

There is an excel file on here that tom66 created.
The voltages should read a nice even slope down.

[Nawual]

Re: Screen white Samsung LE37B550A5W

I'm going to look for that excel and try to understand it. Thanks

[diif]

Re: Screen white Samsung LE37B550A5W

To save you looking.

[Nawual]

Re: Screen white Samsung LE37B550A5W

Ohhhh!,thanks mate!

[Nawual]

Re: Screen white Samsung LE37B550A5W

If I pass the data that I have measured to the graph of the excel I can see that the relationship between the tensions is not correct.

[Nawual]

Re: Screen white Samsung LE37B550A5W

For example, VG12 and VG13, VG10 and VG11, have very close tensions

[diif]

Re: Screen white Samsung LE37B550A5W

Yes, you're correct.