And you are sure that R7085 & R7086 are OK? If you are send me an address on privat message, and I will send you known good Q7080 and Q7085.
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SMC Issue on MBP 13 - Hardware Troubleshooting Guide
- Thread starter Dadioh
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And you are sure that R7085 & R7086 are OK? If you are send me an address on privat message, and I will send you known good Q7080 and Q7085.
Yes, both R7085 and R7086 are good. R7085 measures 471,1K and R7086 333,1K. I sent my address via private message.
Hello Guys
I have got a MBA 2013 which is badly liquid damaged.
After cleaning the logic board, I face these problems:
Firstly: The mega safe light nothing, no green no orange.
When i connect the mega safe the fan start spining 2 second and turn off, after about 2 second it start again and goes off again, on the third time the board starts.
But if connect the internal LCD lights 2 second and then the light goes off but the operating system loads normaly until the inlogning.
there i mentioned the the grafical view diappeard and came back many times and then the board turned off ( by the way, i had no back light ).
I can name some measurment have done:
C7116 pin 1: 1.2 v pin 2: 8.5 v
R7116 pin 1: 1.2 v pin 2: 1.2 v
C7115 pin 1: 1.2 v pin 2: 1.2 v
R7115 pin 1: 1.2 v pin 2: 1.2 v
J6950 battery connector:
Pin 1,2,3: 8.6 v but some times fall down to 2.5 v or less and go back again and it is not solid 8.6 v.
q7155 is the same problem like the pins on battery connector, and i can say the related componenent around it are the same, i think even the fuse F7140 have the same problem.
I appriciate all kind of advices.
thanks in advance.
I have got a MBA 2013 which is badly liquid damaged.
After cleaning the logic board, I face these problems:
Firstly: The mega safe light nothing, no green no orange.
When i connect the mega safe the fan start spining 2 second and turn off, after about 2 second it start again and goes off again, on the third time the board starts.
But if connect the internal LCD lights 2 second and then the light goes off but the operating system loads normaly until the inlogning.
there i mentioned the the grafical view diappeard and came back many times and then the board turned off ( by the way, i had no back light ).
I can name some measurment have done:
C7116 pin 1: 1.2 v pin 2: 8.5 v
R7116 pin 1: 1.2 v pin 2: 1.2 v
C7115 pin 1: 1.2 v pin 2: 1.2 v
R7115 pin 1: 1.2 v pin 2: 1.2 v
J6950 battery connector:
Pin 1,2,3: 8.6 v but some times fall down to 2.5 v or less and go back again and it is not solid 8.6 v.
q7155 is the same problem like the pins on battery connector, and i can say the related componenent around it are the same, i think even the fuse F7140 have the same problem.
I appriciate all kind of advices.
thanks in advance.
You definitely have a short, and of everything that you say seems to be around LCD backlight. Try to clean it under a microscope and if you see a chip with too much corrosion you have to remove it and clean under it. Some times also are cases when 1-2 pins from the chip are missing. Look also all the resistors in the bad area some of them is very likely to become infinity or short after a water damage. But be careful backlight chip is attached with very small balls under it in MBA.
what i found today is:
The R7152 and R7151 i have a resistance to ground that start on low level and start to count up and it went up to more than 42k ohm which i think there is short some where but i,m not sure if these are the problem, they could be effected by some thing else.
by the way i have about the same resistance on the R7150 , that i think it is the sens resistor.
and all of this component are working with u7100 the charge IC.
So feel i need more advices.
thanks
In this case switch the places of the multimeter probes, you have a serial capacitor attached and it charges.
Hi!
My macbook (A1278 late 2008)
Logicboard: 820-2327
One week ago it just suddenly turned itself off.
By pressing the power button nothing happens.
I have allready tried all kinds of resets but had no luck.
If i do the temporary bypass, i just get the fan on high speed turning. But no start sound.
Magsafe light is here, also tried with another magsafe adaptor.
No water damage or some visible defects on the logicboard.
I hope you can help me to troubleshoot
Thanks in advance!
My macbook (A1278 late 2008)
Logicboard: 820-2327
One week ago it just suddenly turned itself off.
By pressing the power button nothing happens.
I have allready tried all kinds of resets but had no luck.
If i do the temporary bypass, i just get the fan on high speed turning. But no start sound.
Magsafe light is here, also tried with another magsafe adaptor.
No water damage or some visible defects on the logicboard.
I hope you can help me to troubleshoot
Thanks in advance!
Macbook A1342 will only boot in SMC bypass - sometimes
I have a Macbook A1342 (2010) that will only boot in SMC bypass some of the time. But most of the time it appears dead.
But when it does boot in SMC bypass I can reinstall Yosemite without any trouble and everything appears to work although it won't charge the battery.
So, if the SMC is unhappy, should I check voltages on the SMC/debug connector?
What voltages should I be looking for that would indicate a no-go situation for the SMC?
Thanks in advance.
I have a Macbook A1342 (2010) that will only boot in SMC bypass some of the time. But most of the time it appears dead.
But when it does boot in SMC bypass I can reinstall Yosemite without any trouble and everything appears to work although it won't charge the battery.
So, if the SMC is unhappy, should I check voltages on the SMC/debug connector?
What voltages should I be looking for that would indicate a no-go situation for the SMC?
Thanks in advance.
Thanks for the offer, but I've got the schematics and board view already.
It's just frustrating that I've got MACOSX installed under SMC bypass, but it won't boot normally!
As a note, is it possible to reset the SMC using the power on pads?
It's just that my keyboard is liquid damaged so I've disconnected for the moment so can't do the shift-control-option thingy.
It's just frustrating that I've got MACOSX installed under SMC bypass, but it won't boot normally!
As a note, is it possible to reset the SMC using the power on pads?
It's just that my keyboard is liquid damaged so I've disconnected for the moment so can't do the shift-control-option thingy.
MBP 13 mid 2010 Battery Problem
Dear Friends,
I have a problem with my MBP 13 mid 2010.
The battery is charging very very slow (about 14 Hours for full charge)
I already tryed with another battery, no better. Also with new installation.
I think it is a problem on Logicboard. May be the IC ISL625?
Many thanks for your help!!!!
Dear Friends,
I have a problem with my MBP 13 mid 2010.
The battery is charging very very slow (about 14 Hours for full charge)
I already tryed with another battery, no better. Also with new installation.
I think it is a problem on Logicboard. May be the IC ISL625?
Many thanks for your help!!!!
Hi all
I have a mid 2009 MBP 13" A1278 that has had some water spilled on it (specifically the charge port area) and is refusing to turn on. Here are some of the steps I've done troubleshooting. My sister has a working MBP 13" that I tested different things with.
- Checked the "G3 Hot" pads and get 3.4V and 0 on them.
- Charger is dead or appears to be. On both the good and the bad the charger lit is dim. Her charger is bright green or orange on hers, dim on the bad MBP
- Checked voltage on the DC-in board on both. On hers, the good one, it went 0, 16V, 3-5V, 16V, 0. On the bad it was 0, 17, 17, 17, 0. Don't know if that was fine or not. The middle pin seems to be different, forgot what that drives.
- Swapped batteries. I know the "bad" MBP has been sitting for months and likely doesn't have a charge. Figured I would swap in a battery that was very close to fully charged and see if it would power up. That didn't change a thing. To me, that rules out a DC-in board.
Any other steps I can take, or are there components on the logic board that can be replaced and how to diagnose those? I see mention of checking some other components on the logic board. Is there a post or a diagram of which to check for voltage? I'd like to narrow it down with my DMM, since I have 3.4V on G3 Hot, it seems there is a chance.
I have a mid 2009 MBP 13" A1278 that has had some water spilled on it (specifically the charge port area) and is refusing to turn on. Here are some of the steps I've done troubleshooting. My sister has a working MBP 13" that I tested different things with.
- Checked the "G3 Hot" pads and get 3.4V and 0 on them.
- Charger is dead or appears to be. On both the good and the bad the charger lit is dim. Her charger is bright green or orange on hers, dim on the bad MBP
- Checked voltage on the DC-in board on both. On hers, the good one, it went 0, 16V, 3-5V, 16V, 0. On the bad it was 0, 17, 17, 17, 0. Don't know if that was fine or not. The middle pin seems to be different, forgot what that drives.
- Swapped batteries. I know the "bad" MBP has been sitting for months and likely doesn't have a charge. Figured I would swap in a battery that was very close to fully charged and see if it would power up. That didn't change a thing. To me, that rules out a DC-in board.
Any other steps I can take, or are there components on the logic board that can be replaced and how to diagnose those? I see mention of checking some other components on the logic board. Is there a post or a diagram of which to check for voltage? I'd like to narrow it down with my DMM, since I have 3.4V on G3 Hot, it seems there is a chance.
Take the board out first and clean it up with IPA.
You may do further damage if you try to power on and there's liquid/foreign objects on the logic board. Once this is done and while the logic board is out of the case, try powering on using the power on pads located on the board. Failing this, it's time to go through the usual steps of checking key signals and power rails.
There's some posts earlier in this thread that give a good idea of what to do.
You may do further damage if you try to power on and there's liquid/foreign objects on the logic board. Once this is done and while the logic board is out of the case, try powering on using the power on pads located on the board. Failing this, it's time to go through the usual steps of checking key signals and power rails.
There's some posts earlier in this thread that give a good idea of what to do.
Mbp 13" 2011 8,1
Hi guys i have been searching for the cure of my MBP since last year.
Last year, i'm using my MBP just like an ordinary day but it suddenly lagged when the battery turned less that 1% then unexpectedly shut down. Since then i can't start my MBP normally. I tried everything, replacing the battery, replacing the magsafe, SMC reset, PRAM reset, and NOTHING.
I've been reading some stuffs and most say that it is an smc failure or logic board problem. I can't bring my MBP to a genius bar since i don't have time and no genius bar is near.
Also, for the past 3 months, i've been using my MBP in bypass mode where the fans are high and the battery logo isa marked "X", if i'll try to start it normally the led light at the front just start then dies. My magsafe is only in green indicating that the battery is not charging.
Any inisights/fix guys? i really can't afford a new laptop, plus, i already loved my MBP.
Hi guys i have been searching for the cure of my MBP since last year.
Last year, i'm using my MBP just like an ordinary day but it suddenly lagged when the battery turned less that 1% then unexpectedly shut down. Since then i can't start my MBP normally. I tried everything, replacing the battery, replacing the magsafe, SMC reset, PRAM reset, and NOTHING.
I've been reading some stuffs and most say that it is an smc failure or logic board problem. I can't bring my MBP to a genius bar since i don't have time and no genius bar is near.
Also, for the past 3 months, i've been using my MBP in bypass mode where the fans are high and the battery logo isa marked "X", if i'll try to start it normally the led light at the front just start then dies. My magsafe is only in green indicating that the battery is not charging.
Any inisights/fix guys? i really can't afford a new laptop, plus, i already loved my MBP.
Thanks Kevin! I've got it all cleaned with IPA and allowed it to dry. I spent the better part of an hour cleaning with IPA and then allowing it to dry.
Can you explain more on
? Are you talking about jumping the G3 Hot rail?
Wondering if you know or have any booksmarks on specific post numbers. 3300+ posts is daunting and a lot of reading to sift through.
That's the power on pads I was talking about.
Check the fuses too.
And also try the SMC bypass procedure (if you haven't already
).
There's some interesting stuff at page 65. This also refers to a document that describes the power up sequence, but it's pretty heavy.
Wondered if anyone has a flowchart or similar to go through a logical sequence of checks to fault find a board?
Check the fuses too.
And also try the SMC bypass procedure (if you haven't already
).There's some interesting stuff at page 65. This also refers to a document that describes the power up sequence, but it's pretty heavy.
Wondered if anyone has a flowchart or similar to go through a logical sequence of checks to fault find a board?
That helps a ton! Of course though, I'm working on a mid 2009 MBP and it has both pads they are talking about. Wondering which pads to short? I know the ones to the right of the HDD connector have power to one of the pins.
Alright, just tried jumping this per the manual and it doesn't jump on either pin set. I'm getting voltage at both, but no starting up this far. I'll keep researching, hopefully stumble upon a post that has specific things to verify and voltages for those.
Hi,
first of all I want to say great forum, thanks to everyone.
I have 820-2879b motherboard from macbook 13" from 2010 that don't have 12v rail, g3Hot is 3.4v
I tried everything that I know. Firstly removed fuse to system to isolate problem. Problem is in power circuit around u7000. Input voltage flucturate from 16.8v to 17.2v. On Q7085 pin 4 voltage goes from 6.7v to 16v every few sec. U7000 pin 1 goes from 0v to 16v every few sec. I have green light on charger but not orange when battery present. ACIN is 4v on u7000 but on pin 23 instead of 12v I have from 1.5v to 3.5v. Bgate pin 16 also around 3v. Everything flucturate.
With battery only there is 12v.
There is no short to ground, but I don't know what can be wrong. Every resistor is good, I replaced all caps and u7000 2 times but no progress. Line from R7020 to u7000 is good, no problem with that. ACOK also good.
I need help here please, if you need any other info just say.
Thanks.
first of all I want to say great forum, thanks to everyone.
I have 820-2879b motherboard from macbook 13" from 2010 that don't have 12v rail, g3Hot is 3.4v
I tried everything that I know. Firstly removed fuse to system to isolate problem. Problem is in power circuit around u7000. Input voltage flucturate from 16.8v to 17.2v. On Q7085 pin 4 voltage goes from 6.7v to 16v every few sec. U7000 pin 1 goes from 0v to 16v every few sec. I have green light on charger but not orange when battery present. ACIN is 4v on u7000 but on pin 23 instead of 12v I have from 1.5v to 3.5v. Bgate pin 16 also around 3v. Everything flucturate.
With battery only there is 12v.
There is no short to ground, but I don't know what can be wrong. Every resistor is good, I replaced all caps and u7000 2 times but no progress. Line from R7020 to u7000 is good, no problem with that. ACOK also good.
I need help here please, if you need any other info just say.
Thanks.
Hi!
I have the same problem with a 2011 Macbook Air. My one had water damage and the charger IC (and the pads around it) was very badly corroded. Also I found two FETs what were short. Second U7000, new FETs from a donor board and still have no 12V. With battery everything is fine until the battery dies.
I've started from the first part of this thread and doing some of the prelim testing.
Have 3.4V at G3Hot rail, have just under 18V at the right side of the small mosfet or whatever the component is located close to the upper right by the DC-in board. It has 4 legs on the inboard side and one solid pad on the side facing the edge of the computer. I've taken a picture shown below.
The one thing I noticed is that the top most leg (would be closest to the back of the MBP) looks to be broken. Would this cause some issues?
Have 3.4V at G3Hot rail, have just under 18V at the right side of the small mosfet or whatever the component is located close to the upper right by the DC-in board. It has 4 legs on the inboard side and one solid pad on the side facing the edge of the computer. I've taken a picture shown below.
The one thing I noticed is that the top most leg (would be closest to the back of the MBP) looks to be broken. Would this cause some issues?
