820-2936 with backlight but no image

[huzeafa]

hello guys , have got an 820-2936 with backlight but no image. below are what I get on the display connector .

pin 2 and 3 and 4 = 3.3V
pin 6 and 7 = 3.3V
pin 8, 9 ,11,12,14,15,17 and 18 =1.2V
pin 21 and 22 =26.90V
pin 24,25,26,27,28 and 29 = 0.8V


I have replaced the screen connector but no changes . Please where do I go from here

 

[2informaticos]

Do you get black screen, or pure white?
Did you try known good LCD assembly?
External video correct?

 

[huzeafa]

There is external image
, and its a black screen , but proper backlight shine from the back of the display . I have also tried a known good display

 

[2informaticos]

Check L9080...

 

[huzeafa]

already replaced L9080 before , still no changes

 

[2informaticos]

Check diode mode to ground readings for all LVDS data lines; w/ and w/o LCD connected.

 

[huzeafa]

ok checking