Samsung LA40F81BDX problem

[Begbie]

Ive got a curious one here. I have a LA40F81BDX it was a great TV until it has suddenly developed a screen problem. I have checked the PS for the regular problems (bad caps) but to no avail, I have also changed out the T-Con board and had no luck. It appears everything is working fine (sound, etc) and on pressing the menu button the screen does change to a different image.

I just need to know what else to try or if I am wasting my time. Thanks!

[stj]

Re: Samsung LA40F81BDX problem

could be a bad vram.
if it's bga your in trouble, but if it's tsop you may find a compatable chip on a scrap board to swap over.

could be something else too - but ram is the most unreliable type of chips.

[budm]

Re: Samsung LA40F81BDX problem

So it shows just lines on the screen and no image on the back ground?
How many ribbon cables it has between the T-CON and the LCD panel? I would try having one ribbon cable connected one at a time to see what you get on the screen.

[Begbie]

Re: Samsung LA40F81BDX problem

So it shows just lines on the screen and no image on the back ground?
How many ribbon cables it has between the T-CON and the LCD panel? I would try having one ribbon cable connected one at a time to see what you get on the screen.

IT definitely has two. I will try this and let you know.

[tom66]

Re: Samsung LA40F81BDX problem

Not vram IMHO as image is not perfectly even (image slightly fades.)
Probably panel defect.

[Begbie]

Re: Samsung LA40F81BDX problem

OK there is four ribbon cables between the TCon and the panel. On removing them each in turn I get very similar results to the existing problem although the vertical patterns are slightly different and in one instance the half the panel is all white.

[budm]

Re: Samsung LA40F81BDX problem

I agree with Tom.

[Begbie]

Re: Samsung LA40F81BDX problem

Thanks guys