820-3330-b NO BACKLIGHT

[zockysworkshop]

I have 820-3330-b 17 inch MacBook woth no water damage but physical damage i hear the chime and i light up the apple on the back with flash light to make sure is backlight issue and the computer is booting in OS. I check the F9700 was blown i replace it and after that Q9706 got burned smoke came out. So i remove F9700 and started measuring i've noticed that LCD_BKLT_EN is missing and when i follow that line takes me to U9600 GMUX and i dont even know how this thing work. Any Ideas ???

 

[dukefawks]

You have a short on the backlight output. Probably burned connector or cable. Q9706 fried because you replaced the fuse with a wire or more than 3A.

 

[zockysworkshop]

No Title

I'M wondering if LCD_BKLT_EN should be present with no fuse because im missing that signal and without that signal i think Q9706 wouldn't open

 

[zockysworkshop]

I'M wondering if LCD_BKLT_EN should be present with no fuse because im missing that signal and without that signal i think Q9706 wouldn't open.

 

[zockysworkshop]

LCD connector look like brand new AND CABLE TOO

 

[zockysworkshop]

When i put wire on the fuse, computer wouldn't start anymore. I remove the wire and its working again

 

[zockysworkshop]

R9788 Is 0.00001 ohms i got another that i measured 300k i put it on motherboard and I measure again and i still get 0.00001 ohm. Any ideas I'm getting crazy. haha

 

[dukefawks]

R9788 measuring short is because Q9706 is dead. There is a short on the backlight output, measure it, who cares that connector and cable look good.

 

[zockysworkshop]

I fix the backlight issue but now getting message "Your computer restarted because of problem. press power button to restart "

 

[zockysworkshop]

Run hardware test everything passed

 

[zockysworkshop]

No Title

Kernel issue

 

[dukefawks]

There is no information in that photo. Boot from a known good USB stick with 10.9 or later.

 

[zockysworkshop]

i try to boot from usb still doing same issue and i also run extended Apple Diagnose hardware and it pass everything. I haven't seen problem like this before