Dadioh,
I checked R5087 and it measures 470k, so that is fine.
I also checked the two resistors near the BIL and they are also fine (2.61K).
Do you have anything else to recommend?
Thanks for your help.
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SMC Issue on MBP 13 - Hardware Troubleshooting Guide
- Thread starter Dadioh
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Dadioh,
I checked R5087 and it measures 470k, so that is fine.
I also checked the two resistors near the BIL and they are also fine (2.61K).
Do you have anything else to recommend?
Thanks for your help.
Dear People,
I hold a MacBook Pro "Core i5" 2.5 13" Mid-2012, Model A1278 (EMC 2554*)
Can one of you tell me what the right board number is for the diagram and the boardview
or point me to a list where I can find it?
thanks a lot.
Robert
I hold a MacBook Pro "Core i5" 2.5 13" Mid-2012, Model A1278 (EMC 2554*)
Can one of you tell me what the right board number is for the diagram and the boardview
or point me to a list where I can find it?
thanks a lot.
Robert
there is a 820-**** number around the fan edge area, just a guess 820-3115-b...
Any body want to share their 820-2850 board view and schematic I would really appreciate your help. Thanks
Hi cpufixer,
thanks for your replay.
You are right it is 820-3115-b realy hard to read.
thanks again.
I have a follow up question.
I have the schematic of the 820-3115-b baord and the board view file and Landrex V2.2
When I start to test the rails and copy the rail name from the pdf to the Landrex program I only get the first one PPBUS_G3H. it lights up nicely at the board.
When I select the next or any other one I cannot find it in the board view software.
I hold 3 copies of the board view file but non of them do it!
what is wrong?
thanks,
Ps. it also states at the bottum of the landrex software Not found: PPxyz
I have the schematic of the 820-3115-b baord and the board view file and Landrex V2.2
When I start to test the rails and copy the rail name from the pdf to the Landrex program I only get the first one PPBUS_G3H. it lights up nicely at the board.
When I select the next or any other one I cannot find it in the board view software.
I hold 3 copies of the board view file but non of them do it!
what is wrong?
thanks,
Ps. it also states at the bottum of the landrex software Not found: PPxyz
Board view power rail names are slightly different than on schematics. Find any component on schematics on power rail that you want to test, write in board view that component (press C than enter component name) and than check on pin 1 or 2 what is correct name of that power rail in board view.
hi to all, i'm ruben from italy. i'm not good with electronics, so i hope you can help me to fix my unique macbook pro payed a lot of money
the macbook pro is model a1278 i7. motherboard 820-2936-a
a) it says "battery not charging" 61%
b) if i disconnect the power supply, it power off
c) with only the battery, it doesn't power on
d) when i connect the power supply (with or without the battery), it power on itself
e) the led of the power supply is always green
f) i have 5/8 led on the battery only if i connect the power supply
g) i've try to reset smc. but it doesn't work (led always green)
h) if i hold for then second power button, then i connect the power supply then i release the power button, it power on with fan at max speed, but the battery is not seen anymore
i) i've try to do all those thing with the motherboard outside the case and with anythign connected, it doesn't change, i've always the same problem
the macbook pro is model a1278 i7. motherboard 820-2936-a
a) it says "battery not charging" 61%
b) if i disconnect the power supply, it power off
c) with only the battery, it doesn't power on
d) when i connect the power supply (with or without the battery), it power on itself
e) the led of the power supply is always green
f) i have 5/8 led on the battery only if i connect the power supply
g) i've try to reset smc. but it doesn't work (led always green)
h) if i hold for then second power button, then i connect the power supply then i release the power button, it power on with fan at max speed, but the battery is not seen anymore
i) i've try to do all those thing with the motherboard outside the case and with anythign connected, it doesn't change, i've always the same problem
hi to all, i'm ruben from italy. i'm not good with electronics, so i hope you can help me to fix my unique macbook pro payed a lot of money
the macbook pro is model a1278 i7. motherboard 820-2936-a
a) it says "battery not charging" 61%
b) if i disconnect the power supply, it power off
c) with only the battery, it doesn't power on
d) when i connect the power supply (with or without the battery), it power on itself
e) the led of the power supply is always green
f) i have 5/8 led on the battery only if i connect the power supply
g) i've try to reset smc. but it doesn't work (led always green)
h) if i hold for then second power button, then i connect the power supply then i release the power button, it power on with fan at max speed, but the battery is not seen anymore
i) i've try to do all those thing with the motherboard outside the case and with anythign connected, it doesn't change, i've always the same problem
Without any knowledge in electronics and proper equipment you can't do much. Only thing that you can is to replace battery with new one (even tho I doubt that this is battery problem). You have very common problem when macbook see battery but don't run from it and doesn't charge. This is problem usually around ISL6259 qfn. If you can't measure anything then it is impossible to get any answer. Do you have anyone who can test this board for you and post measurements?
tell me what to test and i will test
Check resistors R5280, R5281, R7051, R7052 and also Q7055. Post resistor values and voltages on both sides, and voltages on each pin from Q7055.
Great got it working now I hope a last question.
ON page 7 of the schematic diagram it states "G3Hot"(always - present) Rails.
Does this mean that all the rails listed on this page are always present when a mac safe power supply is connected?
Or that only some of the rails are present? If only some, can one of you indicate the once that must be present?
Thanks for the help on this.
Robert
I have started with some first testing and some times the green led on the macsafe does light and the next time it does not.
I have al the power that are linked to PP18V5_DCIN_CONN.
On page 64 of de schematic the whole 5.5V "G3Hot"Supply is missing but I have 5 Volt on R7001 a source to U7000!
The U6990 is giving no out put as the power in on R6905 is available but not on R6990.
When I connect the adapter I hear a clicking noise comming from the PCB near the ethernet connector?
this is all on a 820-3115-b logic board.
What would be the best way to approuch this?
thanks,
I have al the power that are linked to PP18V5_DCIN_CONN.
On page 64 of de schematic the whole 5.5V "G3Hot"Supply is missing but I have 5 Volt on R7001 a source to U7000!
The U6990 is giving no out put as the power in on R6905 is available but not on R6990.
When I connect the adapter I hear a clicking noise comming from the PCB near the ethernet connector?
this is all on a 820-3115-b logic board.
What would be the best way to approuch this?
thanks,
First you need steady bright green light on magsafe adapter. Remove battery, connect only magsafe and then measure and post results for the following components:
- voltage on input and output of the D6990 and L6995
- voltage on U6901 pin 1
Also make sure that you have good connection between magsafe connector and magsafe adapter, because it is weird that you sometimes have green light and sometimes don't.
When I measure the pin 1 and 2 on J6900 I read 16.5 Volts.
The input of D6990 pin 1 is 0,42 Volts and pin 2 reads 16.5 Volts and pin 3 reads 16.5 Volts
The input of L6995 pin 1 is 0 Volts and pin 2 is also 0 Volts.
The LED on the MacSafe lights up slightly I can see it lite when I switch off some lights in my room.
The color is green. The logic board is out of the case and no battery is attached.
I hope this helps.
thanks
I corrected the values for a 60 Watt MacSafe I was using a 45 Watt MacSafe, Still no luck
Last edited:
Ok, clearly you don't have P3V42G3H, you need to find out why. Best way would be to measure if you have short to ground on L6995 (put your multimeter in diode mode, red probe on ground and black on pin 1 or 2). If you have short, than you need to remove L6995 and than check on what side is short present. If you don't have short at all than your U6990 is bad.
I have a C2D 17" MacBook Pro. It has the U7201
• The battery stopped charging
• The magsafe doesn't turn green
• The magsafe connector works fine (checked voltages on the sub-board)
• The magsafe now dimly blinks orange (You can only see this in the dark) and the laptop won't boot
• The battery check button shows makes green LED blink. If the battery is disconnected it will chase like Knight Rider KITT car.
• The macbook won't boot if I disconnect the battery. I read somewhere this should be possible, only that the processor will run at half speed. Is this correct? If so, then I'll probably trash this macbook as I don't see anything obvious to fix.
If there is anything left to try please let me know.
• The battery stopped charging
• The magsafe doesn't turn green
• The magsafe connector works fine (checked voltages on the sub-board)
• The magsafe now dimly blinks orange (You can only see this in the dark) and the laptop won't boot
• The battery check button shows makes green LED blink. If the battery is disconnected it will chase like Knight Rider KITT car.
• The macbook won't boot if I disconnect the battery. I read somewhere this should be possible, only that the processor will run at half speed. Is this correct? If so, then I'll probably trash this macbook as I don't see anything obvious to fix.
If there is anything left to try please let me know.
Update:
I'm now trying the solution suggested at the end of this thread by buzzanthony:
https://discussions.apple.com/thread/3755979
The red light stays on for about a minute then slowly goes out. The battery indictor does not go on, so I don't think anything is being charged.
I'm now trying the solution suggested at the end of this thread by buzzanthony:
https://discussions.apple.com/thread/3755979
The red light stays on for about a minute then slowly goes out. The battery indictor does not go on, so I don't think anything is being charged.
Got a little problem with my macbook pro 13 mid 2012...
1) Without battery there is a green light and everything works fine
2) with battery there is no green/orange light, but the macbook works fine with a charged battery(turns on, but no charge/light)
3) when i disconnect the battery and connect the power supply, there is a green light. when i connect the battery with a green light, everything works fine and the battery is charging (orange light)
4) when i disconnect the power supply with a orange light (macbook is on) and reconnect it, the battery does not charge and the light is dim orange
maybe there was a water damage, but there is no corrosion on the board. a few weeks ago the macbook worked fine. i already tried a smc reset(worked, but nothing changed)
1) Without battery there is a green light and everything works fine
2) with battery there is no green/orange light, but the macbook works fine with a charged battery(turns on, but no charge/light)
3) when i disconnect the battery and connect the power supply, there is a green light. when i connect the battery with a green light, everything works fine and the battery is charging (orange light)
4) when i disconnect the power supply with a orange light (macbook is on) and reconnect it, the battery does not charge and the light is dim orange
maybe there was a water damage, but there is no corrosion on the board. a few weeks ago the macbook worked fine. i already tried a smc reset(worked, but nothing changed)
Hi,
I have problem with my 820-3115-B logic board. (no liquid damage) Keyboard and Trackpad are not working. I have already checked many things:
I'm also happy about any other advice what i can do to fix this problem.
Thanks in advance
works24
I have problem with my 820-3115-B logic board. (no liquid damage) Keyboard and Trackpad are not working. I have already checked many things:
- Keyboard is working. (SMC reset works with internal keyboard)
- U5701 is getting power
- Resistors are fine
- Bluethooth and USB ports are working fine
- Connection between U5701 and U2700 is fine
I'm also happy about any other advice what i can do to fix this problem.
Thanks in advance
works24