Macbook Air bad screen - or...??

[Milwaukee Mac Repair]

This is replacement screen on A1466 macbook Air 820-00165-A. Half the screen image is dim. Did I get a bad screen? O'scope image is of LED_RETURN_1-6. Of all remaining pins - only I2C_TCON_SCL_R = 3.3 VDC. backlight is 24.66 VDC.

 

[JohnB8812]

Very very likely a bad LCD

 

[2informaticos]

If all 6 return lines give the same signal, then could be the screen.

"Of all remaining pins - only I2C_TCON_SCL_R = 3.3 VDC"
I don't really what you mean to say.
SCL/SDA lines should both have 3V.
If not, check R8361-64 and diode mode to ground.

 

[Milwaukee Mac Repair]

Thanks for that response! I meant those were the only voltages present on connector aside from backlight. I hope this helps others.