Macbook pro 820-3332 No Backlight

[capon5153]

hello all,
so there is image but no backlight, i can use the laptop with external screen via HDMI,
i have checked the board and found an damaged LCD fuse F9700, replaced it but this didnt solve the problem.

these are some readings that i have made, i have measured all with the LCD connected

L9000 (PP5VR3V3_SW_LCD) - PIN1 5V PIN2 5V

C9000 (PPVOUT_S0_LCDBKLT)- PIN1 0V PIN2 0V

F9700 PIN1 12.94V PIN2 0V

[piernov]

Re: Macbook pro 820-3332 No Backlight

Resistance to ground on PPVOUT_S0_LCDBKLT with and without LCD?

[capon5153]

Re: Macbook pro 820-3332 No Backlight

hello,
do i have to measure it with the power connected or disconnected?

[Zibbo]

Re: Macbook pro 820-3332 No Backlight

hello,
do i have to measure it with the power connected or disconnected?

You measure with power disconnected

[capon5153]

Re: Macbook pro 820-3332 No Backlight

so i set the multimeter to 200KΩ

no LCD i measure 56.2K
with LCD 0.009K

what does that mean?

[piernov]

Re: Macbook pro 820-3332 No Backlight

Bad LCD or LCD cable.

[capon5153]

Re: Macbook pro 820-3332 No Backlight

i have measured again the F9700 fuse and now i have 8.2v to 8.6v

but shouldnt this be more than that?

[capon5153]

Re: Macbook pro 820-3332 No Backlight

i have forgot to mention that the trackpad and keyboard are also not working. the keyboard lights up but its not working

[p_d]

Re: Macbook pro 820-3332 No Backlight

? water damage
whatever blue the fuse is still a problem

[capon5153]

Re: Macbook pro 820-3332 No Backlight

? water damage
whatever blue the fuse is still a problem

i have found that the pin 1 and 2 on left on lvds connector are damaged.
can this cause the backlight not to work? because backlight connector is not damaged as you can see on the picture