gugutm
Member
Last Activity: 02-20-2025, 09:00 PM
Joined: 04-10-2019
Location: uk
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well pin 22 and pin 14 is same P5VP3V3_VREG3 and to measure it i am using c7656 that is why i was getting 3.3v to confirm i double checked and measured an actual pins on u7650
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on j6951 pin 2,3 i got 3.3v for
[B]SMBUS_3V3_BATT_SCL pin 2
SMBUS_3V3_BATT_SDA[/B] pin 3well pin 22 and pin 14 is same P5VP3V3_VREG3 and to measure it i am using c7656 that is...Leave a comment:
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u7650 pin 23 ppvin_g3h_p3v3g3h 12.32v
pin 14 P5VP3V3_VREG3 3.3v
pin 12 pv5_p3v3g3h_ldo_en 0v so its not enabled
does it mean this chip could be faulty? and if understand correctly this voltade coming from u7800 true 3 resisters but even on resister no voltage...Leave a comment:
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Hi Mon2 Thank you for answering
no power motherboard is out on PP5V_S5_LDO in resistance mode c7651 pin 1 ol pin 2 000.4 oms in diode mode red prob to ground 0,504v no short...Leave a comment:
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a1989 820-00850 stuck at 5v 0.041a Help
Hello everyone,
I'm new to the forum,sorry english is not my first language too, i got a basic plus knowledge, but now i am in this situation where i need some help , i spend good few days reading forums , here and outside , to help my problem solve, with no luck
long story short, i bought macbook pro a1989 820-00850, clean no water damage which was stuck on 5v 0.200/300a i read a lot of forums what that could be , it indicated to faulty corrupted t2 rom
of course before jumping to conclusion and connected to DFU , i believe i done basic checks... -
Hello everyone,
I'm new to the forum, In my spare time i like to buy mac books and all sort of electronic stuff fix it and flip it, the life is not easy this days
, and extra knowledge is a bonus
wbr
gugutmLeave a comment:
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Hello everyone
i bought a macbook pro a1398 like a scrap , but motherboard was working but when i was trying to install catalina it didnt let me, only high sierra, then i start messing about with bios , because i wanna to have the same serial on a back battery case , i believe i change it and it feels like all good but when i try to reimage mac os, is dead slow its loading forever , i believe either i messed up, or its already was something not right, so the way i do understand maybe clean me bios can help me i tried to follow [I][COLOR=Red][B]piernov[/B][/COLOR][/I] video , but...Leave a comment:
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Re: Macbook Pro 15" A1707 820-00928-04 no chime,no boot,no image 19.92v 0.900a
no this is going be beyond my limits i can try reboil it but not to change , thank you for your help Mon2
shame i could not fix itLeave a comment:
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Re: Macbook Pro 15" A1707 820-00928-04 no chime,no boot,no image 19.92v 0.900a
when i plug amp meter it shows 14.58v then jumps to 20.14 1.317 a an gradually, few sec goes to 19.99 to about 0.890aLeave a comment:
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Re: Macbook Pro 15" A1707 820-00928-04 no chime,no boot,no image 19.92v 0.900a
ok I am sorry i will take this in mind never have power while i am measuring resistance or diode mode
please accept my apologies and thanks for help
lets start again
f7000 in beep mode no power red pin 1 black pin 2 beeps and shows 000.5om
f7000 in beep mode no power black pin 1 red pin 2 beeps and shows 000.4om
resistance mode auto f7000 red prob on ground black prob on pin 1 2.550 kom
resistance mode auto f7000 red prob on ground black prob on...Leave a comment:
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Re: Macbook Pro 15" A1707 820-00928-04 no chime,no boot,no image 19.92v 0.900a
Good morning
Voltage to ground of PPBUS_G3H?
power connected and on r6907 pin 1 and 2 12.63v
i tried to measure in a resistance mode i believe cb703 pin1 red prob to ground 000.0 om
i am confused does it mean short
or i am doing something wrong ?
i read another post about this motherboard and you asked the same question so i done on f7000 pin 2 and i am getting 000.0 om
many thanksLast edited by gugutm; 08-06-2023, 02:17 AM.Leave a comment:
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Re: Macbook Pro 15" A1707 820-00928-04 no chime,no boot,no image 19.92v 0.900a
Any help? please i would really appreciate itLeave a comment:
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Re: Macbook Pro 15" A1707 820-00928-04 no chime,no boot,no image 19.92v 0.900a
no i did not reflow it i might need to do it
sorry made a mistake it wasnt u5400 it was u7900 my bad sorry for misleading information i uploaded a picture before and will add what is looks like now
i reflow the u7900 so on the pin 1 i am getting 12,56v on a pin 8 1.2v looks okey . to me...Last edited by gugutm; 08-05-2023, 05:42 AM.Leave a comment:
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Macbook Pro 15" A1707 820-00928-04 no chime,no boot,no image 19.92v 0.900a
Hi everyone
Please bear with me as I am not yet a pro with some of these issues. Trying to watch a lot of youtube videos and master myself but there are things which I cannot fix and would like to ask for a help from the pro people.
Got macbook a1707 board no 820-00928-04
It had a water damage on couple components, green staff corrosion,
C7680 ppbus _hs_oth3v3, tested for short I believe its okey red prob on ground, getting 2.512kilo om
C7251 ppbus_hs_cpu done the same and getting about the same, 2.506kilo om
U5400 some corrosion, I clear all this...Last edited by gugutm; 08-05-2023, 05:11 AM. -
Re: New Members - please post your introductions here
Hi There
This forum comes out not the first time when i am looking for capacitors , so i am new , i thing i will get a lot of good advice from smart people
Regards
GugutmLeave a comment:
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