SMC Issue on MBP 13 - Hardware Troubleshooting Guide

[vaprx]

The photograph you shown maybe a reason why you have this damage. In previous post Dadioh mentioned about being careful when connecting battery or magsafe to the system on the workbench. Bare logicboard with the DCIN board connected could cause an un-intended short due to its short connecting cable. Your blown IC is indicative this type of accidental short of the power bus.

Thank you very much for your input, that is a good point. If only that was the case, then we would know the reason. However that's not the cause as I am careful about things like that. The board was inside the case and screwed down when I connected power. And as mentioned the magsafe indicator went green, but when the battery was connected it all went south from there.

The board was only placed on the bench for photographs, now it is stored in an anti static bag.

 

[rufunky]

I assume they're not the same boards but the -b revision builds upon the first.

You would be correct sir. The 820-2879-b is different from the 820-2879. And it looks like I was the one that was confused earlier. According to the schematics the 820-2879 has the ISL 6258A and my 820-2879-b does have the newer ISL 6259AHRTZ!

 

[laptech]

Can anyone help me? I have a water damaged MBP 13" late 2011 and cleaned the logic board (820-2936-B) with 100% ethanol and a toothbrush.

When I put it back together and plugged in the magsafe charger, the light turned green! Great I thought, but instead of trying to turn it on I plugged the battery back in and to my horror two components (circled red in the photos) started smoking and glowing RED hot! Needless to say I immediately unplugged the battery. But now the magsafe light only glows a very dim green and the MBP won't turn on.

I've attached photos of the logic board with the burned components, can anyone identify them? I am unable to read the markings on them as the heat destroyed them. The top one I think is a capacitor and as you can see in the photo the surrounding PCB is glossy from the heat. The lower IC chip got so hot it bubbled up and bits flaked off.

Is it at all possible for me to purchase and replace these two components? As I think the logic board is in very good condition otherwise, the corrosion wasn't very serious, and prior to reconnecting the battery the magsafe light seemed to indicate a functional board (why did the battery cause a failure?)

Thank you very much in advance, any help would be much appreciated!

Hi, I have a working 820-2936-B (K90I,schematic and boardview I found on this site, just search for them like I did) and have taken a picture of the IC you've requested. According to the schematic diagram, the IC is U9410 (TPS2590) but as you can see from the picture, it is labelled SN1010, so maybe Apple have used an alternative part. The capacitor is identified in the schematic as C3892, 4.7 UF, 10%,10v, X5R 805.


kind regards
Roger

 

[laptech]

Help with 820-2850-A

Hi, I wonder if anyone out there can help me. I am after the boardview of a 820-2850-A logic board. I believe it is a K18. I have 3 boards here to fix and have managed to find a schematic but due to the difficult nature of the fault, I need the use of the boardview for this board to help me further. I have looked in all the usual places and have only managed to find once place that has it, which is on a polish repair forum but you have to have a certain amount of credits to download the file. I have tried sites that sell schematics but they don't have the boardview for the K18.

Do any of you know other than the polish forum where I maybe be able to find the boardview. I don't mind having to pay for it from any of the schematic selling sites but I cant find one that sells it.

Any help would be greatly appreciated.

kind regards
Roger

 

[Lambiquie]

Hi, I wonder if anyone out there can help me. I am after the boardview of a 820-2850-A logic board. I believe it is a K18. I have 3 boards here to fix and have managed to find a schematic but due to the difficult nature of the fault, I need the use of the boardview for this board to help me further. I have looked in all the usual places and have only managed to find once place that has it, which is on a polish repair forum but you have to have a certain amount of credits to download the file. I have tried sites that sell schematics but they don't have the boardview for the K18.

Do any of you know other than the polish forum where I maybe be able to find the boardview. I don't mind having to pay for it from any of the schematic selling sites but I cant find one that sells it.

Any help would be greatly appreciated.

kind regards
Roger

I don't know how different the 820-2850-A is from the 820-2850, but you could buy one from http://laptop-schematics.com/view/8610/ - I see in the xls file that the 820-2850 is available.
I bought the schematics and the boarview file for my Macbook from them several months ago and I had no problems.

 

[rufunky]

I tested around the board and seem to be getting proper voltages when comparing them to other posts here but honestly I'm not sure where I should start. Looks like the U7000 enables charging? on what pin does this happen and what voltage should it be reading?


Macbook pro mid 2010 ( 820-2879-b ) symptoms:

-System turns on but ONLY gets power from battery (indicates not charging).

-Magsafe glows green when connected ( does not show orange with depleted battery )

-No battery indicator lights when button is pressed on side on fully charged battery ( Flex ribbon works ).

-SMC bypass usually required to start system but not always

-Everything seems to be working properly with the exception of the Magsafe communicating with the system and battery.

 

[Dadioh]

I tested around the board and seem to be getting proper voltages when comparing them to other posts here but honestly I'm not sure where I should start. Looks like the U7000 enables charging? on what pin does this happen and what voltage should it be reading?


Macbook pro mid 2010 ( 820-2879-b ) symptoms:

-System turns on but ONLY gets power from battery (indicates not charging).

-Magsafe glows green when connected ( does not show orange with depleted battery )

-No battery indicator lights when button is pressed on side on fully charged battery ( Flex ribbon works ).

-SMC bypass usually required to start system but not always

-Everything seems to be working properly with the exception of the Magsafe communicating with the system and battery.

No battery indicator suggests that the battery is not communicating with the SMC. With power applied, check the pins between the +12V and Ground. You should have 3.4V and 0V as per the image attached. If you do not have 3.4V on the i2c bus then one of the pullups could be blown (common issue).

 

[rufunky]

No battery indicator suggests that the battery is not communicating with the SMC. With power applied, check the pins between the +12V and Ground. You should have 3.4V and 0V as per the image attached. If you do not have 3.4V on the i2c bus then one of the pullups could be blown (common issue).

Thanks Dadioh, I hope this was correct. I measured pin 4 and 5 of J6950 with both the magsafe and battery plugged in. Pin 4 fluctuated between 3.36v - 3.38 and Pin 5 fluctuated between .01v - .05v ( shouldn't this be 0v? ).

Weird thing is that while measuring the pins I noticed that the magsafe light turned orange as if it started charging but when I powered the unit on the light automatically went to green and indicated not charging once in the OS.

 

[Dadioh]

Thanks Dadioh, I hope this was correct. I measured pin 4 and 5 of J6950 with both the magsafe and battery plugged in. Pin 4 fluctuated between 3.36v - 3.38 and Pin 5 fluctuated between .01v - .05v ( shouldn't this be 0v? ).

Weird thing is that while measuring the pins I noticed that the magsafe light turned orange as if it started charging but when I powered the unit on the light automatically went to green and indicated not charging once in the OS.

First off... I think I provided the view from the wrong schematic. That one is from a MB Air. The battery pinout is a little different on the Macbook Pro 13". See attached.

It is odd that the probes would change the circuit behaviour. The probes should appear as a very high impedance to those pins so when contacting there should be no effect. The voltages sound correct but maybe one or both of the pullup resistors has failed high impedance.

Next experiment... unplug magsafe and battery connector so that there is no power on the logic board. Now measure the resistance on each of the i2C pins (4 and 6) to the G3Hot signal. You should measure 2.6K.

 

[rufunky]

First off... I think I provided the view from the wrong schematic. That one is from a MB Air. The battery pinout is a little different on the Macbook Pro 13". See attached.

It is odd that the probes would change the circuit behaviour. The probes should appear as a very high impedance to those pins so when contacting there should be no effect. The voltages sound correct but maybe one or both of the pullup resistors has failed high impedance.

Next experiment... unplug magsafe and battery connector so that there is no power on the logic board. Now measure the resistance on each of the i2C pins (4 and 6) to the G3Hot signal. You should measure 2.6K.

Alright, so I guess the probes didn't have anything to do with the magsafe glowing orange.

I'm now noticing that the magsafe goes from green to orange while the unit is off after I unplug and replug the battery in while the magsafe is connected. when I turn on the unit it go straight to green and indicates not charging in OS.

About the wrong schematic. I tested pin 6 and it was reading the same as pin 4.

I'm really new to this could you just verify by the attached picture that I have the correct setting on my multimeter to measure the resistance between pins 4 and 6 to G3hot. I don't want make matters worse by using the wrong settings.

 

[Dadioh]

Alright, so I guess the probes didn't have anything to do with the magsafe glowing orange. I'm now noticing that the magsafe goes from green to orange while the unit is off but when I turn on the unit it go straight to green and indicates not charging in OS.

About the wrong schematic. I tested pin 6 and it was reading the same as pin 4.

I'm really new to this could you just verify by the attached picture that I have the correct setting on my multimeter to measure the resistance between pins 4 and 6 to G3hot. I don't want make matters worse by using the wrong settings.

That is correct. You select a range with a greater value than what you are trying to measure. 20k upper reading to measure 2.6k works.

 

[rufunky]

Next experiment... unplug magsafe and battery connector so that there is no power on the logic board. Now measure the resistance on each of the i2C pins (4 and 6) to the G3Hot signal. You should measure 2.6K.

I'm getting a reading of 10.90 on both 4pin and 6pin to G3hot.

 

[torontomac]

Please help me!!!!

I have a late 2008 15" Macbook Pro that was fully working customer brought it in to be reload os and it was working 100% I reloaded to Lion and everything was functioning I was actually using it for a couple hours. Now it wont boot up it nothing happens when you press the power button but its definitely working as I reset the SMC and the magsafe goes from orange to green also tried shorting the keyboard connector and still no go but it will boot up by using the SMC bypass but not from just pushing the power button alone please help me I need to get this back to customer asap!!!

 

[rufunky]

I have a late 2008 15" Macbook Pro that was fully working customer brought it in to be reload os and it was working 100% I reloaded to Lion and everything was functioning I was actually using it for a couple hours. Now it wont boot up it nothing happens when you press the power button but its definitely working as I reset the SMC and the magsafe goes from orange to green also tried shorting the keyboard connector and still no go but it will boot up by using the SMC bypass but not from just pushing the power button alone please help me I need to get this back to customer asap!!!

Did you try resetting PRAM?

1.Shut down your Mac.
2.Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3.Turn on the computer.
4.Press and hold the Command-Option-P-R keys before the gray screen appears.
5.Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6.Release the keys.


Information stored in NVRAM / PRAM includes:
◾Speaker volume
◾Screen resolution
◾Startup disk selection
◾Recent kernel panic information, if any

 

[torontomac]

Did you try resetting PRAM?

1.Shut down your Mac.
2.Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3.Turn on the computer.
4.Press and hold the Command-Option-P-R keys before the gray screen appears.
5.Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6.Release the keys.


Information stored in NVRAM / PRAM includes:
◾Speaker volume
◾Screen resolution
◾Startup disk selection
◾Recent kernel panic information, if any

Yes I tired that as well but no go it doesnt boot at all but I was able to reset the PRAM after using the SMC bypass but it wont boot I dont understand!!!

 

[peislander]

I have a late 2008 15" Macbook Pro that was fully working customer brought it in to be reload os and it was working 100% I reloaded to Lion and everything was functioning I was actually using it for a couple hours. Now it wont boot up it nothing happens when you press the power button but its definitely working as I reset the SMC and the magsafe goes from orange to green also tried shorting the keyboard connector and still no go but it will boot up by using the SMC bypass but not from just pushing the power button alone please help me I need to get this back to customer asap!!!

Did you get his 85 watt adapter?I had one that the 60 watt would not work once the battery got too low.Good luck

 

[torontomac]

Did you get his 85 watt adapter?I had one that the 60 watt would not work once the battery got too low.Good luck

Weirdest thing! It is an 85watt original apple charger and battery but it now boots up now that the battery is charged past first green light on the battery indicator but even if I take out the battery and try to turn it on and it wont but to my knowledge on past machines that I had late 2008 15" it should work without a battery

 

[rufunky]

Next experiment... unplug magsafe and battery connector so that there is no power on the logic board. Now measure the resistance on each of the i2C pins (4 and 6) to the G3Hot signal. You should measure 2.6K.

I'm getting a reading of 10.90 on both 4pin and 6pin to G3hot.

I measured the resistance directly through both the r5280 r5281 from one side to the other and got 2.61 on both. So the resistors seem to be good.

I also tested from both the r5280 r5281 to G3hot and got a reading of 8.29.

Any Idea why my reading is so off along the path from pins 4 and 6 to G3hot?

 

[laflores]

Hi, I have an issue and I would like to know if you can help me. I have an Early 2011 Macbook Pro 15" that had water damage. The laptop was sleeping when it got wet, and the power adapter was connected. I opened it and checked everything, there was just a little bit of water in the bottom part of the case. The laptop works if it's connected to power, but not from the battery.
When I connect the Magsafe charger to the laptop, it turns on by itself, the sleep light turns on for a few moment, then it flashes like 5 times, and then the laptop starts.
The battery status reads "replace now", and System Info says it has voltage (12410 mV) but no charge (0 mAh).
Do you think it's just a matter of replacing the battery, or could it be something more? Thanks.

 

[Dadioh]

Hi, I have an issue and I would like to know if you can help me. I have an Early 2011 Macbook Pro 15" that had water damage. The laptop was sleeping when it got wet, and the power adapter was connected. I opened it and checked everything, there was just a little bit of water in the bottom part of the case. The laptop works if it's connected to power, but not from the battery.
When I connect the Magsafe charger to the laptop, it turns on by itself, the sleep light turns on for a few moment, then it flashes like 5 times, and then the laptop starts.
The battery status reads "replace now", and System Info says it has voltage (12410 mV) but no charge (0 mAh).
Do you think it's just a matter of replacing the battery, or could it be something more? Thanks.

First thing to do is SMC and PRAM resets. If that does not help then you either have a bad battery or failed charging circuit.

 

[macelek01]

M98 board view

Hy Everybody!

Could somebody upload the board view of M98 logic board (820-2330-A)?

Thank you!

 

[laflores]

First thing to do is SMC and PRAM resets. If that does not help then you either have a bad battery or failed charging circuit.

Thanks, already did SMC and PRAM reset... I think I'm going to an authorized repair center.

 

[rufunky]

Next experiment... unplug magsafe and battery connector so that there is no power on the logic board. Now measure the resistance on each of the i2C pins (4 and 6) to the G3Hot signal. You should measure 2.6K.

Ok, as I stated before I'm getting a reading of 10.90 on both 4pin and 6pin to G3hot. I just tested a known working same model MacBook and got the same reading so I am assuming this is a correct reading and I am indeed getting the proper resistance from the battery to G3hot. Maybe I misunderstood what it was you were asking me to measure?

 

[Dadioh]

Ok, as I stated before I'm getting a reading of 10.90 on both 4pin and 6pin to G3hot. I just tested a known working same model MacBook and got the same reading so I am assuming this is a correct reading and I am indeed getting the proper resistance from the battery to G3hot. Maybe I misunderstood what it was you were asking me to measure?

I would have thought that since the resistors are 2.6Kohm that the measurement from there to G3Hot would be 2.6K as well. What point are you using as your G3Hot measurement point?

I think you said that you found the resistors and they both measure 2.6K.

Anyway, if they are the correct values then that probably is not the issue.

 

[rufunky]

I would have thought that since the resistors are 2.6Kohm that the measurement from there to G3Hot would be 2.6K as well. What point are you using as your G3Hot measurement point?

I think you said that you found the resistors and they both measure 2.6K.

Anyway, if they are the correct values then that probably is not the issue.

I would have thought so to but there must be some other resistors or something along that path.

Yes, I used the board view to locate the resistors by part number and both resistors measured 2.6 when measured end to end.

I am measuring G3hot from the bottom pad located in this picture ( this is not my board just using it as a reference)