SMC Issue on MBP 13 - Hardware Troubleshooting Guide

[Sheridansystems]

If you don't have a windows machine, the board viewer runs under wine on Mac and Linux.

----------



Hi Dan,

What's the board type (820-xxxx)?

Chigwelldave

Its the 820-2530-a
I am starting up an older Dell, and running into downloading issues, of the .brd or landrex.zip, they keep saving as .php's, I hope to get past this and get a boardviewing program, I will need it for other projects so any help is welcomed.
Great forum!

 

[syntax754]

stupid question, nevermind!

 

[Sheridansystems]

That would be the problem then. Something on that bus is not allowing it to be pulled up to 3.4V. See schematic excerpts below. If you are lucky it is one of those components. If not, it could be the ISL6258 charger IC or, worse, the SMC.

Dadioh, the BIL connector components C6953, C6952 and Battery connectors D6950 are not shorted, I need help finding the "Battery A" R5280 and R5281 to check resistance. Can you tell me where its located?

Working today on getting dual booting OSX and Win 7 to run landrex board viewer
Thanks again

 

[ZZZAC]

Dadioh, the BIL connector components C6953, C6952 and Battery connectors D6950 are not shorted, I need help finding the "Battery A" R5280 and R5281 to check resistance. Can you tell me where its located?

Working today on getting dual booting OSX and Win 7 to run landrex board viewer
Thanks again

R5280 on the right R5281 on the left, hope this helps.

 

[Sheridansystems]

R5280 on the right R5281 on the left, hope this helps.

A great help! THank you.

R5280 = 1.98k
R5281 = 1.563k

Next step swap out R5281?
Should I do both? is 1.98 close enough to the 2k spec?

Thanks again

 

[ZZZAC]

A great help! THank you.

R5280 = 1.98k
R5281 = 1.563k

Next step swap out R5281?
Should I do both? is 1.98 close enough to the 2k spec?

Thanks again

1.5k is lower than the 5% tollerence. I doubt its going to repair your system but if you have another one handy replace it.
if you need any more help, let us know.
Good luck

 

[ielektros]

1.5k is lower than the 5% tollerence. I doubt its going to repair your system but if you have another one handy replace it.
if you need any more help, let us know.
Good luck

Normally this 2 resistors are pull up resistors. Not the Ohm is important now. Because the pull ups must have 3V on both ends. If no Voltage at the ends than that is sure not pull up resistor problem. The ISL6258 sometimes going dead and pull down the whole I2C bus. Be sure if no Voltage on this two resistors both ends, than you have other problem.... For pull-up resistor in the schematics diagram between 1KOhm - 100KOhm I think change nothing.

 

[Sheridansystems]

Normally this 2 resistors are pull up resistors. Not the Ohm is important now. Because the pull ups must have 3V on both ends. If no Voltage at the ends than that is sure not pull up resistor problem. The ISL6258 sometimes going dead and pull down the whole I2C bus. Be sure if no Voltage on this two resistors both ends, than you have other problem.... For pull-up resistor in the schematics diagram between 1KOhm - 100KOhm I think change nothing.

Replacing the resistors did not work as you knew. I am not getting 3v on all resistors. R5281 on the battery and BIL side of the resistor is 173mv, all others are 3.4v. Any ideas on what to check next?
Thanks for your help

 

[Sheridansystems]

Normally this 2 resistors are pull up resistors. Not the Ohm is important now. Because the pull ups must have 3V on both ends. If no Voltage at the ends than that is sure not pull up resistor problem. The ISL6258 sometimes going dead and pull down the whole I2C bus. Be sure if no Voltage on this two resistors both ends, than you have other problem.... For pull-up resistor in the schematics diagram between 1KOhm - 100KOhm I think change nothing.

Any help to locate and test the ISL6258 would be great!

Still trying to dual boot my iMac to run Win 7 for Landrex.

 

[cpufixer]

just a quick question 820-3115-B mbp

Is it ok to replace a INA214 with INA213, U5410.?

 

[ZZZAC]

Any help to locate and test the ISL6258 would be great!

Still trying to dual boot my iMac to run Win 7 for Landrex.

What was the problem again?
have you tried running ASD?

 

[Sheridansystems]

What was the problem again?
have you tried running ASD?

The MBP will charge, but not see or run off the battery. R5281 is 0 volts on the SMBUS_SMC_BSA_SCL side. I changed both R5280 and R5281, ielektros thought the ISL6258 may be pulling down the I2C bus? So I need to located the ISL6258, and go from there.

ASD? Any board viewing pro would really help me find these components. I will google ASD, but can you give me more info to find the program?

Thanks for any help.

 

[ZZZAC]

The MBP will charge, but not see or run off the battery. R5281 is 0 volts on the SMBUS_SMC_BSA_SCL side. I changed both R5280 and R5281, ielektros thought the ISL6258 may be pulling down the I2C bus? So I need to located the ISL6258, and go from there.

ASD? Any board viewing pro would really help me find these components. I will google ASD, but can you give me more info to find the program?

Thanks for any help.

ASD stands for apple service diagnostics.
This is what service providers are given to determine where faults lie in systems. it tests allsorts and will often give you an error code determining where the faults may lie.
If a system has some level of function i often use this before attempting to diagnose any further.
there are different versions for different year. i think the 820-3530 is supported on 3s132 version

 

[chigwelldave]

Any help to locate and test the ISL6258 would be great!

Still trying to dual boot my iMac to run Win 7 for Landrex.

You don't need to go to all the trouble of dual booting - just install Wine. The boardviewer exe will run on osx in Wine's environment.

 

[varungargi]

G3HOT gives 7.45V instead of 3.45V

Hi

I am working on a A1278 820-3115 board(Mid 2012 13" MBP).
History of the board is, it was water damaged, I cleaned it.
Green light on MagSafe.

Checked the voltages on all pins of U6990(PM6640)

PIN 7 and 4 -> 17.4 V
PIN 6 -> 7.45V but it should be 3.45V
also the chip gets a little heated.

I checked all the Caps C6991,C6994,C6996,C6999 all gives me a value in Kohms, so assuming there is no short with Caps.

Could any one help me why the output voltage is high.

Also wanted to add there was a short somewhere on the board and the pin 4 and 7 was reading resistance less then 10, but when I removed the U6990 cleaned the pads and re-soldered back in place I didn't observe the short, but ended up getting 7.45 Volts on PIN 6 which is not good.

Thanks in advance.

 

[danandmary]

if you don't have a windows machine, the board viewer runs under wine on mac and linux.

----------



hi dan,

what's the board type (820-xxxx)?

Chigwelldave

820-3115-b

 

[ZZZAC]

Hi

I am working on a A1278 820-3115 board(Mid 2012 13" MBP).
History of the board is, it was water damaged, I cleaned it.
Green light on MagSafe.

Checked the voltages on all pins of U6990(PM6640)

PIN 7 and 4 -> 17.4 V
PIN 6 -> 7.45V but it should be 3.45V
also the chip gets a little heated.

I checked all the Caps C6991,C6994,C6996,C6999 all gives me a value in Kohms, so assuming there is no short with Caps.

Could any one help me why the output voltage is high.

Also wanted to add there was a short somewhere on the board and the pin 4 and 7 was reading resistance less then 10, but when I removed the U6990 cleaned the pads and re-soldered back in place I didn't observe the short, but ended up getting 7.45 Volts on PIN 6 which is not good.

Thanks in advance.

did you replace it the wrong way round? ive seen this problem once. i powered down instantly as i hated the thought of 7v going to the smc, i replaced the IC and it turned out either there was a bad soldering job or it was a bad IC.

 

[varungargi]

Thanks, I got my hands on a schematic and the brd file. I am stuck now can't seem to find the issue. No green light on adapter I just hear a ticking noise. Checked G3HOT and it's getting the power it requires. Checked the ISL6259 and it's working as suppose to. The only problem I seemed to find is no voltage on the ADAPTER_SENSE. U6900 is not getting power at all. I get the required power to the R6929 and I have checked the U6901 before that and it's working fine there. The macbook works fine on battery and it even powers up without the battery if you do a SMC Reset. Any help would be appreciated. I attached the schematics for the board if anyone wants to look at it. And yes I am using a working DC board from another macbook.

Hi code600

Could you please share the brd file also for board 820-3115
I am in search of R6995 on my board.

Thanks in advance.

 

[varungargi]

did you replace it the wrong way round? ive seen this problem once. i powered down instantly as i hated the thought of 7v going to the smc, i replaced the IC and it turned out either there was a bad soldering job or it was a bad IC.

I think I have placed the IC the correct way.
I have also powered down the board with in 10 sec, i hope i have not blown the SMC chip in this 10 sec . . .
But will confirm in few hours as soon as I get my hands on the board back

Also is there a way to check if the PM6640 chip is faulty.
I was not able to find the data sheet of PM6640 all the links landed to PM6641

After removing the chip I wanted to check if the chip is working on or not.

 

[nicoar10]

Hi code600

Could you please share the brd file also for board 820-3115
I am in search of R6995 on my board.

Thanks in advance.

Here you got it

https://www.dropbox.com/sh/zgrhh3h2d6eizm1/AABzu10TsnOJqiMRtbbVG6hia

 

[ZZZAC]

I think I have placed the IC the correct way.
I have also powered down the board with in 10 sec, i hope i have not blown the SMC chip in this 10 sec . . .
But will confirm in few hours as soon as I get my hands on the board back

Also is there a way to check if the PM6640 chip is faulty.
I was not able to find the data sheet of PM6640 all the links landed to PM6641

After removing the chip I wanted to check if the chip is working on or not.

try re soldering it again. i believe the chip sits with the dot in the top right corner of the package.
If you still get 7v. turn it off quickly. check resistors around g3hot and if all is good replace the regulator.

 

[dellxps15]

my 820-2879 has still the problem that it's ok with battery. without battery magsafe light is green, but have no 12.5 volt on battery fuse. on q7085 i have 10v on pin 4 that drop to 8volt if i put battery.
when i have magsafe and put battery, magsafe light start blinking.

with onlòy magsafe, i have oscillating volt on battery fuse going from 3.8v to 0 and so on.

on u7000 all voltage seems ok. i have also 5volt coming in like posted some post ahead
edit: just found that on pin 4 of q7085, now with battery connected magsafe light is ok, but as soon as i probe the red wire of multimeter to read value, magsafe start blinking and voltage (ith batery) goes from 8v to 11v... just by touching that pin 4 with red probe (black probe was on metal case)

 

[mousepad]

I have a 17" 2914 LogicBoard (Circuit PBus Supply & Battery Charger is the same as a 15" 2915). No liquid damage. Only powers and works from battery - altough the magsafe lights green. I have change the U7000 chip an it works fine (boot also from magsafe only, load the battery)- for a few days or weeks. Than the same problem. Change the U7000 again - good for some days…
Anyone can help?

 

[Sheridansystems]

ASD stands for apple service diagnostics.
This is what service providers are given to determine where faults lie in systems. it tests allsorts and will often give you an error code determining where the faults may lie.
If a system has some level of function i often use this before attempting to diagnose any further.
there are different versions for different year. i think the 820-3530 is supported on 3s132 version

Ive been out of the business for 9 years, I do hold ACSP, ACPT, ACDT but back in 2001ish so I'm really rusty. I will keep looking for the 3s132 version, but its hard to find. It may have to wait to finish the ACMT's to get the diags from Apple.
Thanks

 

[ZZZAC]

Ive been out of the business for 9 years, I do hold ACSP, ACPT, ACDT but back in 2001ish so I'm really rusty. I will keep looking for the 3s132 version, but its hard to find. It may have to wait to finish the ACMT's to get the diags from Apple.
Thanks

i managed to find em alright on a few dodgy websites, got about 30gb worth of different ASD DMG's.
Only problem is i cant load them on my dodgy boards due to what i believe is MCP failure (hangs loading video controller)

But certainly if you can Run ASD before going any further!

Replacing ISL6259 may resolve the problem, it could also be a problem with the smc, witch will be a pain to deal with.

Do you still want to see where the chip is on the baord view?