Pink tint on screen Dell U2312HM

[onurz]

I just saw  this https://www.eevblog.com/forum/repair/dell-u2312hm-power-supply-board-repair/. What a coincidence, 2 different problem with same monitor in one day.



I have a Dell U2312HM that I haven’t used for few years. Last time I used it was fine. Now I need to use again so I plugged it in and I saw there are some disturbance on screen. There is a pink tint on right half side of the screen, some waves going on there as welland some texts have reddish shadow. When I checked internet I saw some people experienced similar problem with this panel.

Here is picture of another user, mine looks similar but my pink tint is on the right side of the panel.

I tried record a video to show the waves but it is not seen on the recorded video. These waves hint me that may be some capacitors are gone bad on power board?

I tried different inputs,  same problem. While no input, monitor menu also shows same problem.

Is this a unrepairable panel problem or is it related with power or display boards? I can try to repair boards but I need a guesstimation. People say that it is caused by long term usage but mine wasn’t used much and had been siting for a long period.

[pbarton]

CCFL backlight tube fault.
Replacing the original CCFL tube with LED strips, seems to be popular.

[onurz]

Does CCFL tube failure cause wave ripples as well?

[keymaster]

this screen make use of leds, no ccfl.

[onurz]

Yes I just checked tftcentral.

"The Dell U2312HM utilises an LG.Display LM230WF3-SLD1 e-IPS panel"
"The U2312HM uses White-LED (W-LED) backlighting."

[Miti]

White LED cannot turn pink. My bet is, if it is indeed LED, there’s a strip of RGB LEDs on both sides and one colour or colour driver is bad on the left side.
However, this is a typical CCFL gone bad symptom, including the waves.

[dersonf]

Hello guys, I have exactly the same problem. This monitor is with me for a long time, I purchased it from a company where a have been worked after finished the services in Brazil since 2016.
The monitor shows this problem one year ago and vanished and back to normal, nowadays problem back again, I disassembled and check all connectors and flats and all seems very good. I don't took out the power board just the controller.
The image at right side is kind of blurred too.
Someone found out a way to fix for yourself replacing some component like capacitors, resistors, transistors or even some of two boards?

Thanks for anything.
 

[dersonf]

I took out the capacitors from the video board next to the video connector and all capacitors are working fine.