Macbook A1534 early 2016 backlight

[limakan]

Hello !

I have an issue with my Macbook A1534 early 2016
Core m3 (M3-6Y30)
1,1 GHz, 8Gb, 256 Gb

Backlight issue : at power on, the LCD screen is 100% white, when I turn the LCD panel some glitches appear, sometimes (around 45°) the LCD is coming back to normal, but very few times.

I replaced the flexible cable LVDS ==> no effect, still same issue

it seems the board is 820-00244 (to be confirmed ?)
I have attached the schematics for 820-00244.

Can you help me in troubleshooting this issue ? is it a faulty driver ship U8401 or a faulty LCD screen ?

[mon2]

Re: Macbook A1534 early 2016 backlight

When it does stop with the full display being like the posted pic, can you see the text / graphics on the LCD?

[limakan]

Re: Macbook A1534 early 2016 backlight

Yes, sometimes the graphics and login page appear, then when I rotate the display, it goes blank, that is why I replaced the LVDS flexcable
sometimes artefacts appear

[limakan]

Re: Macbook A1534 early 2016 backlight

Q8406
pin4 : 8,7V
pin 1,2,5,6 : 0,24 V (instead of 8,7V)
pin 3 : 8,63V

R8401 : 80,1 Ko : ok
R8402 : 63.6 Ko : ok

U8401 pin 11 : 8,57V