Re: Macbook 820-3115B P18V5 issue
The problem is that D6990 only recieves around 4V at Pin 1 and 2 but R6905 or R6990 are totally fine.
Nuld_
Senior Member
Last Activity: 12-14-2023, 05:47 AM
Joined: 06-18-2022
Location: Beselich
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Re: Macbook 820-3115B P18V5 issue
Anything else I could check for ?Leave a comment:
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Re: Macbook 820-3115B P18V5 issue
But i´m really confused that Pin 3 Ohms doesn´t change even when D6990 isn´t soldered on.Leave a comment:
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Re: Macbook 820-3115B P18V5 issue
U6990 seems to be okayLeave a comment:
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Re: Macbook 820-3115B P18V5 issue
U6990 Readings:
Pin 1: 1,268MOhms
Pin 2: O.L
Pin 3: 1MOhms
Pin 4: 31kOhms
Pin 5: 0,1Ohms
Pin 6: 31kOhms
Pin 7: 31kOhms
Pin 8: 31kOhms
Pin 9: 31 kOhms
Pin 10: 184,5kOhms
No donor board which i´m trusting that U6990 is okay.Last edited by Nuld_; 07-07-2022, 01:55 PM.Leave a comment:
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Re: Macbook 820-3115B P18V5 issue
Forgot to mention that U7941 is currently missing on this board.Leave a comment:
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Re: Macbook 820-3115B P18V5 issue
Same readings with F7040 detached.Leave a comment:
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Re: Macbook 820-3115B P18V5 issue
D6990 readings when removed:
Pin 1-3: 0,227V
Reverse: O.L
Pin 2-3: 0,226V
Reverse: O.LLeave a comment:
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Re: Macbook 820-3115B P18V5 issue
Diode mode readings with new D6990:
Pin 1-3: 0,18V
Reverse: 0,933V
Pin 2-3: 0,2V
Reverse: O.L
So basically the same readings, new D6990 is a know good one.Leave a comment:
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Re: Macbook 820-3115B P18V5 issue
Removed D6990 readings on Board to ground are:
Pin 1: starts at 25Mohms but is declining.
Pin 2: 39,3kohms
Pin 3: 31,25kohmsLeave a comment:
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Re: Macbook 820-3115B P18V5 issue
Yes, the readings are to ground.
Pin 1-3: 0,227V
Reverse: 0,964V
Pin 2-3: 0,226V
Reverse: O.LLeave a comment:
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Macbook 820-3115B P18V5 issue
Hello there,
So i have a A1278 13" (820-3115-B) which was definitely has been worked on.
There is definitely an issue on the "P18V5_DCIN" Line.
Before I´ve connected the Magsafe Connector and something around or on the backside of D6990 was smoking.
D6990 readings:
Pin 1: starts at 5Mohms but is declining
Pin 2: 25,4kohms
Pin 3: 31kohms -
Re: Macbook 820-3115 missing 3V42_G3H
Yup it is towards the CPU, I guess I will have to focus now on the other defective Logic Board. Nevertheless thanks a lot for your help
Leave a comment:
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Re: Macbook 820-3115 missing 3V42_G3H
I´ve removed R7640, the readings on the board are:
Pin 1: O.L
Pin 2: 0,7 Ohms
Pin 3: O.L
Pin 4: O.LLeave a comment:
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Re: Macbook 820-3115 missing 3V42_G3H
Yes L7630 is still completely onboard.
C7630 is mating with pin 10.Last edited by Nuld_; 07-02-2022, 11:27 AM.Leave a comment:
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Re: Macbook 820-3115 missing 3V42_G3H
Removed U7600 the part itself was reading 10,8Mohms on Pin 10.
On the logicboard Pin 10 is at 1 Ohms.Leave a comment:
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Re: Macbook 820-3115 missing 3V42_G3H
U7600 reading:
1: 0,1 Ohms
2: 1,45kOhms
3: 84,3kOhms
4: O.L
5: 0,1Ohms
6: 1,435kOhms
7: 3,1kOhms
8: 3,1kOhms
9: 10kOhms
10: 0,7Ohms
11: 98kOhms
12: O.L
13: 17,3kOhms
14: 17,3kOhms
15: 6,2MOhms
16: 0,1OhmsLeave a comment:
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Re: Macbook 820-3115 missing 3V42_G3H
Q7630:
2 & 7: OL (MOhms)
1 & 7: O.L (MOhms)
1 & 2: O.L (MOhms)
7 & 3,4,5: 640 Ohms (kOhms)
7 & 6: O.L (MOhms)
6 & 3,4,5 O.L (MOhms)
Q7630 seems to be okay.Leave a comment:
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Re: Macbook 820-3115 missing 3V42_G3H
Anything else i should look for?Leave a comment:
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Re: Macbook 820-3115 missing 3V42_G3H
Q7630:
2 & 7: 5,1 Ohms (Ohms)
1 & 7: 1,3 Mohms (MOhms)
1 & 2: 95,2kOhms (kOhms)
7 & 3,4,5: 0,5Ohms (Ohms)
7 & 6: 35,2MOhms (MOhms)
6 & 3,4,5 35,5Mohms (MOhms)
Pin 2 of L7630 is at 1,6 Ohms after removing Q7630Leave a comment:
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