this is so awful, my friend had a macbook pro, the wifi is the small chip under the screen cover, he connect the cable to wifi card in the wrong side. causing L3404 to burnt. which, now the device able to boot & use, able to use USB,experiencing no wifi detect.


below test under a working screen assembly,
i replace a good L3404, 5v back, but it will cause the system to white screen, no boot.
USB mouse light will flash once then no light, but there's 5v on USB ,L4605,L4615.

i removed U3440 , while L3404 is there, the white screen persist....

Re: need help on a intermittent no display issue.

I have not tested scr cable. Should probably test it first.
Ive replaced the q7700, not knowing whats going on,
The screen has occur intermitten issue once today. And stable after that.
Not sure if it fix that.

Hi
had this macbook pro 15" 2013 model retina.

it has this weird issue of LCD screen intermittent disappearing, while external display has constant display.

while it has no display on the LCD screen, on the system settings(via external display) shows it has there's no LCD screen exist.
and usually after a while screen comes back after awhile.so it's very difficult for me to measure on the board with short fail time.

I don't have chance to use torch to shine on the LCD while the LCD display is gone.
not sure is it something...

Re: New Members - please post your introductions here

Hello guys,
I'm 29 from Singapore.

Doing computer repair works.
Some times come here to see what's new updates and share knowledge in the repair.