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SMC Issue on MBP 13 - Hardware Troubleshooting Guide
- Thread starter Dadioh
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Hi,
First sorry for my english...i'm french and just buy a mbp 13' mid 2010 2.66 mhz that received a shock on it, no water damage.
The shock is near the sd card reader, all the rest of mbp is ok.
But since the shock it wont be abble to power up the mbp.
No light light on magsafe, the battery wont charge...
I have read a lot on this forum, but i was unable to locate the g3hot point to try to power up the mbp. The picture on the first page was different for the mainboard of mine.
this is a picture get on the web similar to my mbp mid 2010 :
https://forums.macrumors.com/attachment.php?attachmentid=334475&d=1333695517
Could you show me where is the g3hot to power up ???
Thanks for all !
First sorry for my english...i'm french and just buy a mbp 13' mid 2010 2.66 mhz that received a shock on it, no water damage.
The shock is near the sd card reader, all the rest of mbp is ok.
But since the shock it wont be abble to power up the mbp.
No light light on magsafe, the battery wont charge...
I have read a lot on this forum, but i was unable to locate the g3hot point to try to power up the mbp. The picture on the first page was different for the mainboard of mine.
this is a picture get on the web similar to my mbp mid 2010 :
https://forums.macrumors.com/attachment.php?attachmentid=334475&d=1333695517
Could you show me where is the g3hot to power up ???
Thanks for all !
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Hi all, I'm new to this thread. I have an A1181 2.4ghz model which powers up after a few days once the CMOS drains itself, I've replaced this with a working one (3V confirmed) but does not function, once the laptop is actually on (Plug in MagSafe and automatically boots - the automatically restart after power is lost function) everything is perfect, and when I push the power off button I receive the usual power down options. However when off it just acts entirely dead, even the pwr pins on the logic board are unresponsive. The board was originally lqiuid damaged and was IP'd and brushed down entirely.Thank you.
Macbook Pro 13" 2010 power on pads
Hi stcbr69!
I marked the power on pads on your image
https://forums.macrumors.com/attachment.php?attachmentid=344415&stc=1&d=1340303277
Hi stcbr69!
I marked the power on pads on your image
https://forums.macrumors.com/attachment.php?attachmentid=344415&stc=1&d=1340303277
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Macbook 2008 Resistor Problem
Hi!
I am following this thread a long time and revived some MacBooks using information from here and also hope to have helped others with my posts.
I have spent some hours on a Macbook Unibody 2008 which at first had only the problem not to recognize the battery but was booting. Then I renewed the isl6258 and since then it does nothing and the voltage on the g3h pads oscillates between 0 and 3.4V if I connect the magsafe connector.
I found two resistors with less resistance than on the circuit diagram. The two resistors I marked on the image are fine, if I desolder them from the board. Soldered to the Board they have much less resistance. I already changed the isl6258 and also checked almost all other capacitors and resistors around it. Did someone have a similar Problem or has some suggestions where to look at, would really appreciate it!
Hi!
I am following this thread a long time and revived some MacBooks using information from here and also hope to have helped others with my posts.
I have spent some hours on a Macbook Unibody 2008 which at first had only the problem not to recognize the battery but was booting. Then I renewed the isl6258 and since then it does nothing and the voltage on the g3h pads oscillates between 0 and 3.4V if I connect the magsafe connector.
I found two resistors with less resistance than on the circuit diagram. The two resistors I marked on the image are fine, if I desolder them from the board. Soldered to the Board they have much less resistance. I already changed the isl6258 and also checked almost all other capacitors and resistors around it. Did someone have a similar Problem or has some suggestions where to look at, would really appreciate it!
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Thanks !!!!
But no power up at all...
No voltage on g3hot, i have test the first fuse (fuse of dc in board), it's ok, i have 16.7v on it,the second fuse on the logic board it's ok but no power on it...some mosfet have voltage but the second fuse who deliver power on logic bord has no voltage !!!!
Help.
If you have no G3HOT at one of this power on test pin (battery only, magsafe only or both), then forget about getting 12v at the second fuse. G3HOT powers the SMC, thus without it none of the power FETs that control voltages to the system will not be turned on. There is a pair of diodes that the cathodes are tied together to the input of the G3HOT (one from battery and the other from magsafe). This is then down regulated by a regulator chip to generate the 3.42v. You have to track this down and figure out why 3.42 is not on before going any further.
So I just received a second White unibody mid 2010 a1342 that would not power on, no liquid damage. When I plugged in my good ac adapter got a super faint green light. Swapped the DC board with a known good one from my parts. Good solid green light (orange when charging). Tried to power it on and nothing (power button did not feel right). Found the jumppads and booted immediately. Ran it for 12hrs or so. Yay, must just need a new topcase. Swapped internals into a known good topcase I have laying around. Damn thing will not boot. Voltage reading on the pads now ~2v but if I check pin 4 of the kb connector I get 3.42v. Any ideas?
MBPro 13 2.4 GHz Logic Board P8600 820-2879-B A1278, EMC:2351
Hi all,
I just buy a MBP 13 on ebay for my kid (400€). He is in perfect condition but the battery doesn't charge.
Magsafe led is always green. I buy a new battery on ebay but it's the same. When I removed magsafe it automatically turns off.
On the motherboard pins near the battery connector, I have 11,55 volts between pin 1,2,3 & 7,8,9 and 3,41 between 1 and 4 or 1 and 6 (with battery and with or without magsafe plugged in). I also have 3,41 on G3h.
The magsafe is working fine on another MBP.
I read a lot on this forum but I'm lost because of too lot information.
Is someone can help me ?
Thanks for any info.
Regards
Hi all,
I just buy a MBP 13 on ebay for my kid (400€). He is in perfect condition but the battery doesn't charge.
Magsafe led is always green. I buy a new battery on ebay but it's the same. When I removed magsafe it automatically turns off.
On the motherboard pins near the battery connector, I have 11,55 volts between pin 1,2,3 & 7,8,9 and 3,41 between 1 and 4 or 1 and 6 (with battery and with or without magsafe plugged in). I also have 3,41 on G3h.
The magsafe is working fine on another MBP.
I read a lot on this forum but I'm lost because of too lot information.
Is someone can help me ?
Thanks for any info.
Regards
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There are only a few components that would prevent your system from working with the battery. As shown in the attached picture (for Late 2010 13" unibody), Q7055 is the power FET that allows charging current or system power for battery operation. If this FET is bad, charging current cannot reach the battery, nor can battery power supply energy thrugh the fuse to power the system. Since you have good battery power at the connector, you should also see that voltage on the DRAIN side of Q7055, and if the FET is commanded to turn on by the SMC (gate signal present), then pin 1/2/3 of that FET should also show battery voltage with magsafe disconnected. Second possibility is R7050, a 0.1 Ohm resistor. That resistor could be open, thus not allowing current to flow to the battery or to the system. The green magsafe indicator is the SMC recognizing the magsafe, but not seeing current flow on R7050, thus it doesn't turn on the yellow/orange color.
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Well if you see 11.55v on Q7055 pins 1/2/3 and 0v on fuse F7040, there is no other component between the two except R7050 and the PC trace connecting these components. What do the system info (apple->about this mac etc.) says on battery status when you have it boot up from magsafe with the battery connected? Does it say "battery installed = yes"?
hey sorry it took me so long to get back to you.. but i unfortunately don't have one of those boards on hand right now..
maybe someone else can chime in here.
That white block with 11.55v on both ends is F7040. So it seemed your problem is probably I2L communication between SMC and battery. Is the tiny flex cable that provide battery status intact? This flex cable gets damage easily when a battery screw is put in, causing bettary status problem to the SMC. Also pins 4 and 5 of the battery connector is the SDA and SCL lines. they should be about 3.4v when not signaling the SMC and pulsing when it is communicating. Does the battery check switch capable of lighting the LEDs?
I typed wrong. The SCL and SDA lines are on pin 4 and 6. Pin 5 is a battery enable pin called SYS_DETECT, a "pull-down" signal to the battery to enable its output, consisting of 10KOhm connection to ground. So both pins 4 and 6 should have 3.4v when not pulsing.
If pin 6 is also 3.4v, then I'd look at the signal SMC_PM_G2_EN. This is a signal from the SMC power management that turn the system on when powered by magsafe or battery. Since the MBP works on magsafe, somewhere along the line a battery sense signal is not making it to the SMC thus it will shut down the system when ever magsafe is removed.
PS: I just re-read the message. When the battery is plugged in, pin 5 should be 0v, as it is being set to logic zero by the R6950, a 10kOhm resistor.
PPS: when you measured 11.5v on the fuse, I assume you are getting that with the magsafe unplugged, right?
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Charger Device
A common issue with these boards is the charger circuit not charging the battery. This would be indicated by no green/orange LED on the magsafe. The first step in these cases is to determine of the charger circuit is happy. The charger device on the MBP13 and Macbook unibody aluminum is up and to the right of the memory sockets. The pin to be measured is pin 14 which is CHGR_ACOK and this will be a steady 3.4V if the charger is happy and trying to charge the battery. If it is 0V then there is an issue with the charge circuit and further troubleshooting is required.
Be very, very careful trying to measure this pin with your multimeter. You really should have fine tip probes for this. Regular probes are too fat and you risk shorting pin 14 to pin 13 during the measurement.
A common issue with these boards is the charger circuit not charging the battery. This would be indicated by no green/orange LED on the magsafe. The first step in these cases is to determine of the charger circuit is happy. The charger device on the MBP13 and Macbook unibody aluminum is up and to the right of the memory sockets. The pin to be measured is pin 14 which is CHGR_ACOK and this will be a steady 3.4V if the charger is happy and trying to charge the battery. If it is 0V then there is an issue with the charge circuit and further troubleshooting is required.
Be very, very careful trying to measure this pin with your multimeter. You really should have fine tip probes for this. Regular probes are too fat and you risk shorting pin 14 to pin 13 during the measurement.
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Hi Orange,
The composant is a diode with "ja" indication but I don't know the exact value.
I join a picture, can you check post 558.
Thanks
Hi,
Yes I made the test with battery only. The light on the magsafe is green. I'm @ work but this afternoon I'll check and give you a feedback.
Thanks a lot.