DSI XL Yellowing display still after replacement

[Marax]

Hello,

I got a DSI XL a few weeks ago and the bottom Display had this Yellow touch. The Potentiometer couldn’t do anything so I bought a new screen and digitizer. Now after replacement it’s still the same so maybe it’s not the screen. Do someone know about this?

This was before the replacement:

And this after:

 

[Jayro]

That is definitely not normal, I bet it's a ribbon cable issue. The whole image is lacking blue.

 

[anotherthing]

I bet it's a ribbon cable issue.

This is most likely the case. Well, it's the best case here. It's like when you have a monitor hooked up with an old VGA cable and that cable is loose in the socket. You end up with a screen that looks yellow.

 

[Marax]

Thank you guy I think I found the issue. I pressed a bit on the flex cable and the wibbled on the screen i think that’s the issue … AliExpress screen …. I think I need some micro soldering it is broken on one trace on the side and I didn’t see it because it’s so small

 

[Marax]

The replacement screen is installed now but the issue remains... Might be a damaged mainboard and i have no clue where it is damaged. Okay i found the issue is the ribbon connector on the Board.

 

[Marax]

It was not the connector i thought it was when i putted my finger on the connector and I changed colors but I think it had something to do with the resistense of my finger. So this might be some Motherboard error but I have no clue where I can start

 

[JuanMena]

It was not the connector i thought it was when i putted my finger on the connector and I changed colors but I think it had something to do with the resistense of my finger. So this might be some Motherboard error but I have no clue where I can start

Maybe the board is failing to deliver a color?

Maybe it's a resistor, a capacitor. Certainly can't tell, I've only had this problem once with a DS Lite and it was the screen.

 

[Marax]

That might be the problem but i dont have the shematics to look deeper into this. This machine might need a new Board. But i spend way too much on it. I bought 2 new screens because i thought the second one was defective. Very annoying.

 

[JuanMena]

Maybe the one pin that outs a color is desoldered from the board?

Have you tried heating the ribbon cable connector to reflow it?

 

[Marax]

I now desoldered the ribbon connector cable and solder es in a new one from an dsi with broken nand. And exactly the same.... Idk i think the board is just broken.
Maybe its just a small cap or smth but i habe no more clue for this one.