Recent content by protocold

no it doesnt, no respond in SMC bypass mode.

sorry i have overlooked that while there is no obvious liquid damages but the TP around Q5490, R5033, Q5030 do have green corrosion, e.g. TP DCIN_5V_VSENSE, DCIN_VSENSE_EN, SMC_PECI_L_R etc.. also the solder joints around components in that area is somewhat rusted(under microscope)... does this...

where to start?

Replaced U7701 fixed it.

you previously show me SMCtool, which I haven't tried yet.. but since this board also use LM4F chip.. can I use one from A1502 onto this A1425 and flash this? But SMCtool doc said it is only for 2013-2017, this A1425 is 2012. I didn't see 820-3462 file... :(

let me try that, but can you enlighten me why it only provides 25v with the bad panel?

820-00165 with water damage(screen connector area looks clean), IO board replaced, cleaned the corrosion and the machine booted up. Survived MacOS install. An hour later the screen died(have backlight + white horizontal lines). Used external monitor and it output OK. Tested dead screen with...

C4901 = 3.36v C4902 = 3.4v C4910 = 1.2v AVREF_SMC = 3.3v by the way, battery was disconnected at all times, that is assumed right? Because you were asking battery bus...

SMBUS_SMC_5_G3_SDA = 0486 diode / 3.4v SMBUS_SMC_5_G3_SCL = 0.487 diode / 3.4v U7201: Pin 23 = 12.24v Pin 22 = 3.3v Pin 12 = 0v Pin 13 = 0v Pin 29 = 0v Pin 21 = 0v

original 60w magsafe known good adapter(tested), machine used to work but has been in storage for 2 years. No liquid damage. PPBUS_G3H = 12.24V PP3V42_g3H = 3.4v PP3V3_S5 = 0V PP5V_S5 = 0V SMC_RESET_L = 3.37v SMC_BC_ACOK = 3.2v now what?

This is 2015. Can i use the SMC from other years of A1502? e.g. 2013?

a stupid question... for some reason i cannot remove the SMC... I suspect perhaps due to glue on the 4 corner cannot be removed 100% under the chip...is there a trick?

PM_RSMRST_L is kept at high. But trigger SMC_ONOFF_L cause NO drop at PM_PWRBTN_L. Always stuck at 3.4v

3V3_SUS is present. RTC_RESET_L = 3.3v PCH_SRTCRST_L = 3.3v PCH_INTRUDER_L = 3.052v PCH_INTVRMEN = 3.23v I just measure these voltages directly while it is powered, do i need to trigger anything while measuring these?

Board looks clean, except there is some tiny corrosion around TP SPI_MSIO_R, no short there. PP3V42_G3H = 3.42V PP5V_S5 = 5v PP3V3_S5 = 3.3v AVREF_SMC = 3.3v PP5V_S3/PP3V3_S3 not present. triggered ONOFF (short pad R5115/16) and no pulse at PM_SLP_S4_L = 0V. PCH_DSWVRMEN = 3.2v PM_DSW_PWRGD...