right half of screen glows blue

[lpraster]

Have recently the problem is that on my UE55C7700 (UE55C7700WSXXN, T-VALDEUC-3018.1) the right half of the screen glows blue.
It has that just have the impression that the black levels a blue shimmer. A white is displayed correctly for example.

I have already tried to eliminate this error by reset to factory condition.
Unfortunately nothing has helped.

If I set the brightness to about 75, the blue on the right side is as good as gone.
If I place the brightness to a very low value, the blue on the right side is unbearable.

The T-Con board (BN81-04358A) and the Power Supply board (BN44-00376A) have already been replaced.
However, this has not eliminated the problem.

I hope someone can help me!

[Lordbyte]

My best guess is that some buffer used for rendering screen have a defective SRAM chip with a stuck bit somewhere in the range of D0..D31 outputting blue instead of black.
Thus, I bet my money on a hardware error

Well .. I suppose some piece of software could stuff buffer with bad values ..
At this stage you lose nothing by totally reinstalling every piece of software, just for the hell of it ..

[beatfreak]

based on 13 months of experience in acer notebook repair i am pretty sure that this problem is hardware related...
is there some moment in the whole tv runtime (from backlight on to backlight off) when the black is displayed normal across the whole screen?
so i also tkink Lordbyte made a good bet on "vga-ram"...

[lpraster]

Thanks for you answers!

is there some moment in the whole tv runtime (from backlight on to backlight off) when the black is displayed normal across the whole screen?

if I switch from one channel to another, then black is displayed normal across the whole screen.

I will try to reinstall the firmware. For that I have to get root access, because i have already VALDEUC-3018.1 installed.
Can you tell me where theses RAM's are placed? Are they placed on the Mainboard?
I hope the panel itself has no failure!

[beatfreak]

yes, the chips should be on mb, what about the bahaviour with other input sources (vga, hdmi, scart...)?

[lpraster]

yes, the chips should be on mb, what about the bahaviour with other input sources (vga, hdmi, scart...)?

with the other input sources i have the same error.

[beatfreak]

ok, then you could try to reset as much software as possible, if you don't brick your tv this way and don't fix your screen you'll need a new mb anyway...
and if you have to order hardware its a good idea to get additional a new lvds-cable for the connection to your panel.

[lpraster]

Thank you all!
I have orderd a new mainboard and a new ribbon-cable!
How deep can i reset the software?
I have done a factory reset and a have reupdated the firmware! Is there more i can do?

[beatfreak]

now, as you are getting a new mb anyway you could get a ex-link cable http://wiki.samygo.tv/index.php5/Ex-Lin ... BD_players and try to format rwarea http://wiki.samygo.tv/index.php5/How_to ... t_USB_hack