SMC Issue on MBP 13 - Hardware Troubleshooting Guide

[dellxps15]

Hi!
congrats for this awesome thread!

I have a 1278 board (Mid2012) with water damage (cleaned with isopropyl)
Board boots using pads with both magsafe and battery, but the battery won't charge, led stays always bright green.
Can someone indicate me what can i try to do?
Really Thanks!!!

ps
2nd pic with damaged zone marked:

hi, from a previous post:

https://forums.macrumors.com/posts/16847311/

the big chip is the U5400 - INA213 / SC70 - High Side Current Sense / Filter

dont think has something to do with battery charge.

on your picture marked in red... has that component a hole on it ?

cant see good, very blurry picture ( love windows phone as i have one )

look for the board for a component colled isl 6258. it's the one for battery charge.

 

[thobie]

Hi,

have a MacBook Air 11" (Mid-2011) with mild liquid spill, after which the battery won't charge or machine run without AC-cord (green light only). Everything else works OK, OS X sees the battery (battery not charring, change now), voltage 7515mV, amperes 0 mA, charge 1680 / 4465 which has came down from 90%->40% after months of use.

Is there any SMD fuse on board, or some other protection which might faulted? Schematics, or help..? New battery and DC-MagSafe-board is coming, but it might be the logic board...

 

[jangirke]

Mac Book Pro 820-2330-A Mainboard pictures with descriptions water damage

Hi

I got a mainboard with water damage that won't power on.
Here are the pics with "descriptions" as far as I got.
http://photouploads.com/images/macbookpro.jpg
http://photouploads.com/images/macboouqu.jpg
I haven't read the 2000+ posts in this channel yet
but I hope you value the work I've done so far with
tips to repair it and don't forget I want to upgrade the
pictures with the correct voltages for at least the points
that show that it is working.
I got the magsafe connected with green lights but it won't
start even with SMC override.
I got voltage on some chips how can I turn it on without
the power button?
http://photouploads.com/images/macboodhd.jpg
http://photouploads.com/images/macboosys.jpg

Thanks Jan Girke

 

[r.deckard]

hi, from a previous post:

https://forums.macrumors.com/posts/16847311/

the big chip is the U5400 - INA213 / SC70 - High Side Current Sense / Filter

dont think has something to do with battery charge.

on your picture marked in red... has that component a hole on it ?

cant see good, very blurry picture ( love windows phone as i have one )

look for the board for a component colled isl 6258. it's the one for battery charge.

Hi dellxps15, thanks for the reply!

Sorry about the quality of the pictures, i will try to use a better camera!
(and yes, i love my 920!)
No, component in picture is aesthetically perfect! (and U5400 too!)
Found isl 6258 :

What measurements i have to take?

Thanks a lot!

 

[thobie]

Just curious, what is the green component on the picture? Four-terminal component..? White is fuse, or cap..?

 

[cmm542000]

fuse F6905 location

got it Kathy thanks your a life saver.. now to find whats going on with my board

Newby here... anyway you or Techkat could forward the location of fuse F6905 to me?

cmm542000@yahoo.com

Thanks in advance!

 

[dellxps15]

Hi dellxps15, thanks for the reply!

Sorry about the quality of the pictures, i will try to use a better camera!
(and yes, i love my 920!)
No, component in picture is aesthetically perfect! (and U5400 too!)
Found isl 6258 :

Image

What measurements i have to take?

Thanks a lot!

lumia 920 too here

check if you have voltage in the red marked zone with and without battery with dc in only and battery only and both at the white fuse.
as i read in first page, battery charge depend on 4 tings:
1)battery and should be ok for you.
2)magsafe (think it's ok too
3)smc bus (rey a smc reset
4)isl6258 (after all that try, check each pin voltage. be carefull to not touch 2 pins at a time.


marked isl6258 pin from 1, 14 and so on.
7 pins each side.

Check pins 4-5 as looks like some corrosion or shorted together. give them a better look.

Just curious, what is the green component on the picture? Four-terminal component..? White is fuse, or cap..?

the green component is some 4 port but dunno it's name.
the white component is a fuse.

 

[tswartfiguer]

hi, from a previous post:

https://forums.macrumors.com/posts/16847311/

the big chip is the U5400 - INA213 / SC70 - High Side Current Sense / Filter

dont think has something to do with battery charge.

on your picture marked in red... has that component a hole on it ?

cant see good, very blurry picture ( love windows phone as i have one )

look for the board for a component colled isl 6258. it's the one for battery charge.

Take a reading with your multimeter, Put the meter in diode mode then put the positive probe on the battery connector ground and take the negative probe and touch it to both data pins on the battery connector 1 at a time and tell me what your reading is

Should be no power to the board when you are doing this. Also the U5400 is part of a sense circuit, it has nothing to do at all with the battery charger.

 

[tswartfiguer]

Hi dellxps15, thanks for the reply!

Sorry about the quality of the pictures, i will try to use a better camera!
(and yes, i love my 920!)
No, component in picture is aesthetically perfect! (and U5400 too!)
Found isl 6258 :

Image

What measurements i have to take?

Thanks a lot!

The green component is a sense resistor. And it is very rare that they go bad.

----------

lumia 920 too here

check if you have voltage in the red marked zone with and without battery with dc in only and battery only and both at the white fuse.
as i read in first page, battery charge depend on 4 tings:
1)battery and should be ok for you.
2)magsafe (think it's ok too
3)smc bus (rey a smc reset
4)isl6258 (after all that try, check each pin voltage. be carefull to not touch 2 pins at a time.


marked isl6258 pin from 1, 14 and so on.
7 pins each side.

Check pins 4-5 as looks like some corrosion or shorted together. give them a better look.



the green component is some 4 port but dunno it's name.
the white component is a fuse.

By the sounds of things the ACIN pin of the intersil chip (ISL9258) is fine you should be taking a reading of the DCIN pin #2

 

[laptech]

Hi

I got a mainboard with water damage that won't power on.
Here are the pics with "descriptions" as far as I got.
http://photouploads.com/images/macbookpro.jpg
http://photouploads.com/images/macboouqu.jpg
I haven't read the 2000+ posts in this channel yet
but I hope you value the work I've done so far with
tips to repair it and don't forget I want to upgrade the
pictures with the correct voltages for at least the points
that show that it is working.
I got the magsafe connected with green lights but it won't
start even with SMC override.
I got voltage on some chips how can I turn it on without
the power button?
http://photouploads.com/images/macboodhd.jpg
http://photouploads.com/images/macboosys.jpg

Thanks Jan Girke

First, establish that you have PPBUS_G3H present at fuse F7040. This is the fuse you have incorrectly marked as 'battery fuse' on your diagram. There should be a voltage of 12v present either side of that fuse. If there is 12v, you next need to establish if you have PP3V3_S5_REG, present at L7260. This is the inductor you have labeled 3R3 on your diagram which is closest to the audio connectors.

PPBUS_G3H is the main 12v that supplies voltage to the rest of the IC's which then inturn generate the other voltages the board requires.
PP3V3_S5_REG is the main 3v that supplies alot of the IC's that require lower voltage to work.

Without these two voltages the board will never ever power on. For information purposes only, there is another core voltage supply required but we know that is working due to the fact you have the green LED showing on the magsafe so there is no need to go down that route.

Check for the two voltages i've mentioned and see what you get.

regards
Laptech

 

[laptech]

hi, i have removed the u7000 that was bad soldered and the flux paste i used was a fake brand so left much waste on the board. as i said i have a short on the board that i have managed to spot in the coil 22 in the picture. it was causing a short in all the board capacitors. what is the direction ot that coil? chipset ?

in the 2 picture i have posted, can we just name all that 25 component so who has a A1278 can spot them easly without ask each time...?

as far as i know i only know the u7000 location..

i need to spot g3hot too to see if it is ok, but not sure if is the one i have marked.

any help wuld be appreciated

http://imageshack.com/a/img196/479/08x6.jpg
http://imageshack.com/a/img593/3628/qn4p.jpg

Hi, the part in question with the short is L7030 and this is where the main 12v of PPBUS_G3H passes through it and through Fuse F7040, this is white fuse on the underside of the logic board near the battery connector. You need to establish which side of the circuit the short is on. You can determine this by removing Fuse F7040 and using a multimeter set to 'continuity check' or 'buzz check' as it's sometimes called due to the meter giving off a buzzer sound. You said you've already replaced U7000.If you tried to power on the board with the short still in-place, it may damaged the replaced chip.

In the majority of shorts i have found like this, it has been due to the 3v/5v regulator IC U7200 TPS51125 is the markings on it, it's marked number 12 on the pictures you took. You can see by the image i've provided that PPBUS_G3H goes to numerous places so removing that Fuse will effectively break the circuit in two, allowing you to narrow down where the short is

hope this helps

Laptech

 

[dellxps15]

hi, first big tnx for the reply and help. ive removed already the coil 22 and the short is only in right side (from the picture)

i have to remove the white battery fuse too to see where the short is ?

L7030 is the coil ?

Edit:

with the coil "22 in my picture" removed the white battery fuse is not shorted annymore.

Hi, the part in question with the short is L7030 and this is where the main 12v of PPBUS_G3H passes through it and through Fuse F7040, this is white fuse on the underside of the logic board near the battery connector. You need to establish which side of the circuit the short is on. You can determine this by removing Fuse F7040 and using a multimeter set to 'continuity check' or 'buzz check' as it's sometimes called due to the meter giving off a buzzer sound. You said you've already replaced U7000.If you tried to power on the board with the short still in-place, it may damaged the replaced chip.

In the majority of shorts i have found like this, it has been due to the 3v/5v regulator IC U7200 TPS51125 is the markings on it, it's marked number 12 on the pictures you took. You can see by the image i've provided that PPBUS_G3H goes to numerous places so removing that Fuse will effectively break the circuit in two, allowing you to narrow down where the short is

hope this helps

Laptech

 

[Barney63]

hi, first big tnx for the reply and help. ive removed already the coil 22 and the short is only in right side (from the picture)

i have to remove the white battery fuse too to see where the short is ?

L7030 is the coil ?

Edit:

with the coil "22 in my picture" removed the white battery fuse is not shorted annymore.

Are you trying to measure the resistance across the coil? If so it will appear as a short, the coil is very low resistance.

Barney

 

[rewgupko]

1.4V at G3 Hot

My macbook pro 2010 17in logic board had water damage. I found that R6905 was fried and replaced it. Now I get a Solid green Magsafe light but the mac will still not boot.

I measure only 1.4 volts at G3hot. I can't tell if the U6991 MOFSET is bad or something else is bringing down the voltage. Does anyone have any experience with this?

 

[dellxps15]

Are you trying to measure the resistance across the coil? If so it will appear as a short, the coil is very low resistance.

Barney

as you can see that is a short, not a low impedance.
just dunno what is in short as the fuse down the battery is not in short annymore.

 

[warre]

Software to view brd files

What software do you use to view the brd files, ive tried Eagle and Allegro Candence Viewer but none of them could open the file.

 

[chigwelldave]

What software do you use to view the brd files, ive tried Eagle and Allegro Candence Viewer but none of them could open the file.

The viewer is called BoardView Viewer or Landrex. It's often packed with the board file in the zip archives but there are plenty of copies linked in this thread. It's a windows app but will run under Wine if you don't have a windows machine.

 

[warre]

The viewer is called BoardView Viewer or Landrex. It's often packed with the board file in the zip archives but there are plenty of copies linked in this thread. It's a windows app but will run under Wine if you don't have a windows machine.

Ahh thanks, i found the landrex.zip one a little earlier but it was a broken zip and just a brd file in it. But after looking trough some larger brd files i found one with the viewer included.

 

[laptech]

hi, first big tnx for the reply and help. ive removed already the coil 22 and the short is only in right side (from the picture)

i have to remove the white battery fuse too to see where the short is ?

L7030 is the coil ?

Edit:

with the coil "22 in my picture" removed the white battery fuse is not shorted annymore.

If you look at the attached diagram you can see what the resultant affect of removing L7030 would have. If you measured the short at the Fuse and the the short has gone since you removed the coil, the short must be coming from either U7000, Q7030 and/or Q7035, dont you agree?

 

[laptech]

My macbook pro 2010 17in logic board had water damage. I found that R6905 was fried and replaced it. Now I get a Solid green Magsafe light but the mac will still not boot.

I measure only 1.4 volts at G3hot. I can't tell if the U6991 MOFSET is bad or something else is bringing down the voltage. Does anyone have any experience with this?

Knowing the logic board number may help first. Look for a number on the logic board starting with 820- and then we can go from there.

Laptech

 

[dellxps15]

tnx again for reply. since u7000 too is removed the problem is in Q7030 or q7035. ill try this 2 component. tnx again

edit: checked q7030 and q7035 pins and 4 is ok on both but 1-2-3-5 are all shorted.

If you look at the attached diagram you can see what the resultant affect of removing L7030 would have. If you measured the short at the Fuse and the the short has gone since you removed the coil, the short must be coming from either U7000, Q7030 and/or Q7035, dont you agree?

 

[greekhero]

MBP 2009 DC-Inboard missing a component

Hi All,

I have a DC-in in board from 2009 MBP that is missing a component. Seems that the component is inline with the sense line of DC-in board.

Does anyone have a schema for the DC-In board or know what the component might be?

Thanks!

 

[triplelucky]

I think its a 22 ohm resistor.

 

[greekhero]

I think its a 22 ohm resistor.

Thanks! will try that.

I do have a question; 22 ohm is very low resistance, are they using the resistor as a fuse? Can I short that path? or use a say 2A fuse?

 

[triplelucky]

I don’t know what they’re doing there.

I just grabbed a Dc-in and measured it, in circuit .

I don’t think I’d short it or replace it with something else.