Hardware 3DS XL backlight issue top screen

[rokko]

Hi
im hoping for some help as to what the problem is.i bought this 3ds xl it was described as faulty
in that the top screen was dim i thought that the screen was faulty so bought a new one only to find
the same problem screen still dim the backlight is there working but very dim.so next i tried the ribbon cable that supplies the speakers the 3d switch etc but that made no difference.
is there anything else i can try help greatly appreciated included some pics

 

[vb_encryption_vb]

Clean the contacts with rubbing alcohol.

 

[rokko]

Clean the contacts with rubbing alcohol.

Hi
thanks for the reply have tried your suggestion but the screen remains the same.if i move the 3d slider up it will brighten the screen slightly
i was wondering is the backlight supplied through the main ribbon cable that connects top lcd to motherboard or is through the two smaller ribbon cables
at the side that connect to speaker/3d ribbon cable or could there be a component failure or short to ground ?

 

[CMDreamer]

You will need to disassemble the 3DS XL to find out. If the ribbon cables are loose, just reseat them.

 

[Mechageo]

You will need to disassemble the 3DS XL to find out. If the ribbon cables are loose, just reseat them.

They said they tested a replacement screen. The system's already been disassembled enough to verify it's not the screen itself.

Unfortunately, I'm not any help with this either.