Re: macbook pro A1278 - green light on magsafe - no power
820 2879 does not turn ON, have a green light ion mag safe. Found S0 enable is missing
PM_SLP_S3_L missing( supposedly 3.4volts?) os zero volts but this signal coming from U1400 CPU, what else I need to check, please help.
Very much appreciates the response.
Pinoyku66
Member
Last Activity: 04-05-2022, 09:00 PM
Joined: 11-15-2020
Location: Buena Park, Ca
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Re: Macbook Pro 15" 820-2850-A no PPBUS_G3H
My board is 820-2850 so I don't have F7000 what I have is F7040 if that's what you mean, anyway it was 000.6 ohms, yes already replace U7000 and also did lot of flux to re-heat and performed lateral solder but don't have leaded solder so I used unleaded one. Use 85 watts Apple PS also bench PS set @ 18.5 volts with 4.6amps. And now is stop my bench PS about few seconds after apply voltage. Something shorting out but cannot find it I also use thermal gun but did not see something heating up. I am really confused now.
Thank...Leave a comment:
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Re: Macbook Pro 15" 820-2850-A no PPBUS_G3H
Thank you so much, here are y readings in U7000 ( just replaced it ), sorry not sure why when I posted the numbers move close to left side
U7000 / ISL6259HRTZ My reading
Pin01 = 0v (probe 200) CHGR_AGATE 0
Pin02 = 18.54v (measured on C7005) PPCHGR_DCIN 17.51
Pin03 = 4.46v (probe 176) CHGR_ACIN 4.24
Pin05 = 1.13v (probe 175) CHGR_ICOMP 0
Pin06 = 3.49v (measured on R7012) CHGR_CELL 1.706
Pin07 = 0.80v (probe 153) CHGR_VCOMP 0
Pin08 = 2.05v (measured...Leave a comment:
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Re: Macbook Pro 15" 820-2850-A no PPBUS_G3H
Thank you so much let me check those voltage divider again, R7010 30.1K and R7011 9.31K also R7021 and R7022 both 10ohmsLeave a comment:
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Re: Macbook Pro 15" 820-2850-A no PPBUS_G3H
Did check these resistor they came out good ( resistance value) but where is the PP5V1_CHGR_VDD to power U7000 coming from. I am not getting voltage values on the pins because U7000 is not power on pin-19 VDD 5.1 volts is missingLeave a comment:
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Re: Macbook Pro 15" 820-2850-A no PPBUS_G3H
My U7000 VDD pin19 not getting the PP5V_CHGR_VDD which supposedly 5.1 volts but nothing where this PP5V_CHGR_VDD coming from?
Thank you guysLeave a comment:
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Re: Macbook Pro 15" 820-2850-A no PPBUS_G3H
Did more testing found that Q7080 in reverse current protection side not getting the PPDCIN_G3H in pins 1 &2 ( no gate voltage in pin-3) but have 18 volts in pins 4&5 because pin 6 (gate has 17.2 volts)Leave a comment:
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Re: Macbook Pro 15" 820-2850-A no PPBUS_G3H
Thank you for replying
Yes I didLeave a comment:
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Macbook Pro 15" 820-2850-A no PPBUS_G3H
Hello have same issues with 820-2850 MacBook.
not getting PPBUS_G3H after U7000 getting 18 volts in pin5 from Q7030 but not in pins 1,2 &3 pin-4 gate was also zero volts checking U7000 pin 24 CHRG UGATE has zero, verify pin-19 VDD has 5.1 volts, pin-3 CHRG ACIN has 7.61 volts, pin-2 CHRG DCIN 16.89 volts, has a green lights in mag safe which I have a 3.4 volts in pin 14 SMC BC ACOK.
what condition that U 7000 suppose to have in order to put high voltage in Q7030 Gate? what else do you think I can check further.
Thank you guys in advance for your big help -
Re: New Members - please post your introductions here
Hello everyone new kid on the block here. I was really glad coming to this site it really helps a lot in increasing knowledge specially for a new beginner like me in trying in fixing Apple computers.
I want to thank the community in putting effort and patient in helping us develop our new found hobby and skills, hoping I can contribute as well once I know more and hoping to help somebody one day in fixing electronics.
Once again thank you everyone ...Leave a comment:
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