Recent content by grmacs

SMC_ADAPTER_EN, PP3V3_SUS AND PM_RSMRST_L are missing. Whats weird is customer says mac just stopped charging and then eventually ran oout of battery. I thought for sure no that dcin back to 20v it would work but no.

0V there.

I get 3v3_S5 but not 3V3_SUS

20.4V DCin w/ zero amp draw. PPBUS is at 8.25V

Customer states the Mac was working until the battery went dead. Was 5v on USB meter. Found short at U4700. Replaced. Now 20v. NO amp draw. Seems stuck in S5 state. Missing PM_RSMRST_L? Not sure how this would be related to the original issue.

It does not wake after natural or intentional sleep whether lid open OR closed and then opened.

It did wake up after 5 minutes but I left it over night and it wont wake again without killing the power.

This mac crashes and kernel panics when trying to wake from sleep after ~5 mins.Only way to get it back is to force shut off and power up. Acts normal otherwise other than when you force it to power off the fans will run up just as it dies. All values at J4802 match working board. Replaced...

Have you seen or heard of temporary backlight at initial power up?

Replaced a few more caps on PPVOUT_S0_LCDBKLT_F after burnig up some more caps. DIode mode there is consistently 1.12 there. Now I'm getting backlight briefly on initial power up and voltage will remain at 54V then drops to 12V and then down to basically zero. KBD backlight voltages seem to...

Excellent info. Thank you! I'll fix that and see what happens!

I'm guessing another bad cap. would that be related or potential cause of LCDBKLT_EN_L: =12.6V?

Liquid damage to backlight area on board. replaced shorted cap C8462 and F8400. LCDBKLT_EN_L: =12.6V BKLT SCL/SDA= 5.1V BKLT EN R =3.3V PP5V_S0_BKLT_D/A= 5V DP_INT_HPD= goes to 3.3V R8450/1/2/3 all good resistance and diode values check out PPVOUT_S0_LCDBKLT_F = diode value is low at .12 -...

SOLVED: Replacing the CPU has resolved the issue.

My Medusa didn’t have proper file for this firmware.