Hi,
I recently bought a used Macbook Late 2008 Aluminum, A1278 M97 MB467LL/A with a non functioning backlight.
Currently I traced the problem to the Q9806 mosfet, I get 12.6V at the source however the drain doesn't seem to want to open. I check the functionality of the mosfet with a multimeter and it's looks good.
Looking at the schematic I can see that the Q9807 mosfet is supposed to drive the Q9806's gate low however the Q9807 is missing from the motherboard. It looks like it never was fitted on the motherboard in the first place but I could be wrong and the previous owner might have removed it.
It's my understanding that if there is no voltage on the PPBUS_S0_LCDBKLT_PWR line then the WLED driver won't be enabled.
Is there anyone with some macbook backlight experience who can shed some light on my issues?
I recently bought a used Macbook Late 2008 Aluminum, A1278 M97 MB467LL/A with a non functioning backlight.
Currently I traced the problem to the Q9806 mosfet, I get 12.6V at the source however the drain doesn't seem to want to open. I check the functionality of the mosfet with a multimeter and it's looks good.
Looking at the schematic I can see that the Q9807 mosfet is supposed to drive the Q9806's gate low however the Q9807 is missing from the motherboard. It looks like it never was fitted on the motherboard in the first place but I could be wrong and the previous owner might have removed it.
It's my understanding that if there is no voltage on the PPBUS_S0_LCDBKLT_PWR line then the WLED driver won't be enabled.
Is there anyone with some macbook backlight experience who can shed some light on my issues?
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