Backlight question

[MDY]

In Quanta R13 board I have external video, and all works ok.
But on lvds screen I have only backlight and no video. Already tried new screen and new lvds cable. Also convert this board to UMA and still the same.
If I have backlight does it mean GPU or CPU video is enable already and this mean some lvds problem?

 

[dukefawks]

Measure all LVDS lines on diode mode at LCD connector. TX**** pins.

 

[MDY]

No Title

In diode mode all TX lines are 0.714

Check image. You can see how image is devided. Suspect PCH?

 

[aprendiz]

Resolution seems wrong, it is the right size display???? Same model as original???

 

[MDY]

Original display only backlight, no video.
Other screen 17.3 LED is the same as at the picture.

 

[dukefawks]

Resolution is being set wrong. Could be an issue with the EDID data/power lines. Pins 3 4 and 5 are for that. Also messing with UMA/DIS could've fucked this. Make things like they were.

 

[MDY]

Before messing with uma/dis I had all the same. I just convert to uma to check if this is gpu problem.
I inspect lvds connector and found pin3 broken. Meybe it touch pin 2 or 4 I dont know. Replaced lvds connector and same problem.

 

[dukefawks]

No idea, is there 3V at pin 3?