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Duke, can you help me please? is it the BIOS?

Pin 7 = 3,398V Pin 3 = 3,398V i have all good rail

hi, nobody can help me?

i check for sign of liquid but really nothing. I ask to the customer, he say the mac stop work when using. Have you an idea?

CPU vcore is it PPVCC_S0_CPU? PPVCC_S0_CPU = 1,779V PPVCC_S0_CPU = 25,5ohm

Hi, i have this board, i check all rail are GOOD (no mistake). the board start fan, i can make a PRAM (i see the fan stop and restart). no chime, nothing on screen, nothing on the external display (with keyboard external), mouse on usb (no light). Corrupt EFI? Board clean no liquid, what is the...

i make a mistake when i take the point pp3v3_s3. i'm here to learn how to repair the board, i can make mistake. thanks

PP3V3_S3 is in short. i remove C3618, now work well. Thanks for your helps

ok i try to change TPS51125 but same problem. 3v3_s5 change between 0V to 3,3V but how can i find an overload on this rail? no short 4,2Kohm thanks

P5V3V3_PGOOD = 0V L7260 pin 2 increase at 3V & fall to 0V P3V3S5_EN =3,4V fix

i don't find anything near TPS51125, seems clean no liquid. S5 rise 5V and fall directly. PP5V_S3 stay at 0V 5V3V3_REG_EN=3,3V

PPBUS fuse = 320Kohm CPU VCORE = 1,2ohm No pulse at all at L7510/20/30, nothing pin48 of U7400 = 1,05V No corrosion, very clean board. is it GPU?

No, no light under the mouse. thanks

ok ALL_SYS_PWRGD = 3,34V stable always high R7402/03 = 180Kohm

I find smc bypass, i press power button and plug the magsafe, nothing on the mac (with or without the battery).

Battery & charger both fluctuate between 11,55V -> 12,46V i Remove F7040 & i measure on C7040, 12,59V and slow fall to 4V in 3 sec and cycling again. U7000 9=0V 15=0V CHGR_DCIN = 16,5V stable SMC_BC_ACOK=3,25->3,3V what is SMC bypass?

Ppvcore_cpu_s0 = 0v thanks for your help

I try a new power board, now the magsafe work on the macbook. Do you know where can i find the schema of the power board? thanks

I'm having a hard time with this particular board. It's an 820-2850 with no power: 1. PPBUS_G3H bounces from 12.6v down to 3,5v, then back up. SMC_PM_G2_EN is also pulsing, as are my S5 rails, fan move just a few. 2. PP3v42_G3H stable at 3.42v. Green light solid. 3. Resistance at U7000 (17/18...

Hi, this board nice (no liquid) don't boot, only fan turn, green light. I check the power rail, seems good except PPVCORE_S0_AXG_REG,PPVCORE_S0_CPU =0v PPVCORE_S0_AXG_REG= PPVCORE_S0_CPU = 1,2ohm, is it normal? CPUIMVP_VR_ON = 3,3V PPBUS_G3H=12,59V Dead U7400? thanks