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no its dead hardly putting out any voltage i doubted it would be on because it needs 3v3_s5 to open the gate

Hardly any power to cpu vcore at all, max voltage 0.030 and back down to 0.000 and back up again you can sort of say its pulsing but not with the proper power.

PP3V3_S5 is pulsing just like the fans are.

Duke your absolutely right, P3V3S5_EN is pulsing. So what could actually be causing enable to pulse in the circuit? In the schematic it says it comes from SMC_PM_G2_EN does this mean bad smc, or something telling the smc signal to pulse.

Yes duke i tried with a battery and it won't turn on i read the battery voltage as well i get 10 volts at the fuse steady 10v no pulsing just wont turn on.

Working on a 820-2850, customer stated i was doing a party and mac dies in the middle of the session. When i opened the back cover and plugged in the charger the fans are pulsing, not spinning only pulsing. so i started to check the power rails, and ppbus_g3h voltage keeps dropping. It will not...

Thanks for the quick response, yes it was liquid damage and 3v42 is present with battery only.

Hi Guys i'm working on a 820-3536 board. Unit works with charger only, it sees the battery, it charges the battery, but when i disconnect the charger the unit cuts off. The 10ohm resistor is also good. Does anyone know what else the problem could be?

Yes I see image but have not tried another lcd I have one but it's cracked I could try it

Hello guys i'm working on a 820-3787 issue it has no backlight. Here is what i found i have 12 v on pins 3 and 4 of Q7706, the problem to me is i have no LCD_BKLT_EN on u7701 therefor the chip won't send pin 3 to a lower voltage to open the drain i traced LCD_BKLT_EN to U8400 then i found that...

Hey Louis its about time you got your word in its 1.5v which sounds like its a dead peace of crap because i replaced the u7300 already

sorry pin 17 was in pin 20 pgood is out i get 0.75v

i did it supposed to be 3.3 v correct pin 17

Looking for some assistance here,all power rails present unit turns on fan spins with 1 beep every 5 or 6 seconds. Frapple site says no ram installed, i checked every rail 1 by 1 everything read normal no water damage viable. I replaced the u7300 chip i tried different rams different slots all...

pp5v_s3 reg shows no voltage on the meter on the scope i get 3.4v on pin 2 of u7501 without grounding the circuit when i ground it i get 0v im confused customer stated just stopped working

Hi guys, I'm working on a 820-4924 board green light on charger, unit will not power on no obvious shorts to ground i cant get it to turn on any ideas here are my readings im confused about ppbus_s4 rail is that normal? PPBUS_G3H 12.58V PPBUS_S5_HS_COMPUTING 12.58 PPBUS_S5_HS_OTHER5V 12.58...

Hi Duke, turns out it was something with the camera. i replaced the trackpad had same problem, turns out the smc camera and trackpad run on the same line. so when i unplugged the camera fans started to spin at normal speed its a retina display and it looked distorted so i gave it back to the...

Hi Guys a customer brought in a macbook pro early 2013, the problem in the fans are spinning at max speed. I checked the board signs of water damage, and none so i ran the internet asd and got error 4SNS/1/C0000008: Ts0P--124. Then i ran the asd efi mode and got error( SMC I0 Failed )any ideas...

Yes now here is the weird thing, I was poking around the audio chip and got sound when I tried the headphone no sound I restarted the computer and then sound was gone again

No audio from headphones either