SMC Issue on MBP 13 - Hardware Troubleshooting Guide

[dobrykamil]

Finaly I change U4900 and now the system detect the battery and charge the battery, thank for all,

Good for you mate!! Was it difficult to replace that BGA chip? What resistance are you getting now on pin 4 and 6 of battery connection? Refer to my .gif posted above, are you getting the same pulse signal?
Thanks.

 

[fouroaks]

I need a little help any one know were I can this part it is broken. This is a MacBook pro 2008 15" board 820-2330-A the part is 3R3844XAE here is a picture. Thanks

 

[coco666]

is not very dificult but, if You have a hotgun (i have a Aoyue hotgun) and a profesional soldering fux, i have another logicboard i5 820-2936-b with one hole and it is imposible to repair, i buy this in eBay, i keep u4900 in this board and put in faulty u4900 board. This chip have a internal program SMC firmware.

Remove a chip and not remove the soldering balls only put a soldering flux and apply hot, then put the chip in the correct position and push a little for all the balls solder to the board then remove the hot gun but not remove push wait 5 seconds and then remove push. I make 2 times for a good soldering but finaly the board is ok

Sorry for my english, i from Spain. If You need moré help write one prívate email.

The resistance now is 230k more or less

Good for you mate!! Was it difficult to replace that BGA chip? What resistance are you getting now on pin 4 and 6 of battery connection? Refer to my .gif posted above, are you getting the same pulse signal?
Thanks.

 

[POUPOU]

Hi to all! Sorry for my bad English.
After one month of reading all the post in this thread, i was able to fix a problem on my MBP A1278.
The problem was MBP turn on, but no charge.(Magsafe light was dim green)
The cause was no PP3V42_G3H on U6901, i retablished this and nothing happen, so after measure U6901 was not make his job; after replacement no light on the magsafe so I changed then R6929 and U6900.
And then all was ok.
The MBP has working 2 days.
And now the mac won't turn on after a sleeping mode. Have trying the smc bypass; keyboard bypass; g3hot bypass, nothing.
It's a K6 LB, I follow the power sequence and I don't have VIN in U7600 it stay on the Drain of Q7620 (12,46V) and don't have VIN in U7300 voltage stay on the Drain of Q9806 (12,46V). I have a doubt on the U7840 all the voltages seems correct but i have nothing for P3V3S5_EN_L.
It gives more idea in two brains that in one, thank you for your help.

that what if found on U7840:

 

[POUPOU]

electronic ????

that what if found on U7840:

I don' t understand why? But now my LB work perfectly??? I was in search and measures so i was measuring U7200 and all was ok so, i replaced all and i'm now writing this message with my MBP repaired so for helping you all, i post here the result of a correct measure of the U7200. I hope it can help.

 

[kamils007]

First thing to fix was the power. The FET by the battery connector was bad after taking some measurements especially D-S. After replacing it, I was getting 12V on Pin 1. Also, I replaced 1uF capacitor next to it. After that the power was back. Now, after connecting megsafe I was getting solid green. My charging issue was easy as I had 'visual hint' the U7000 was burned. Also, one of the 100k resistors on the bottom of the LB was reading 45k. After replacing both the LB started to charge.

It just happens I always get stuck with this issue now - no boot. This LB has pretty much the same problem as the one that I posted 2 months ago. I believe cmdrdata and others were trying to help.

Back than I replaced the CPU Voltage Regular but that didn't help. This chip outputs two very important signals:

PPVCORE_S0_CPU (1.1V)
CPUIMVP_PGOOD (3.3V)

This FET Q7510 on the other hand outputs two very important signals that feed directly to U7400. So like I stated before these two chips output and input signals from each other. I still can't figure out which other signal, resistor or capacitor impacts it so my PPVCORE_S0_CPU and CPUIMVP_PGOOD have both 0V. Need help friends...

CPUIMVP_ISNS1_P
CPUIMVP_ISNS2_P

Hello again.
Has anyone solved this problem?
Regards Kamil.

 

[code600]

Does anyone have the schematics and .brd file for the J30 Logic board 820-3115 it's a Mid-2012? I am willing to pay for it if you have the board view file. Because I have a macbook that will only work on battery. No green light on adapter. It will only power on the macbook with ac adapter if you do a smc reset. Board had tiny water spilled on the magsafe. I have tried a working DC board but still no luck.

 

[Leehs]

Just a quick one. I have a MacBook pro late 2008. I diagnosed dry bga connections to the SMC chip. I reflowed the SMC and it worked fine for a day or two, then went back to not powering up again. I tried another reflow which worked, but it went the same way again. This must be due to the center heatsink expanding and lifting the SMC slightly.. I'm going to have to remove the SMC chip and reball it with leaded BGA balls for a more permanent fix. Does anyone know the size of the balls needed for this?

 

[code600]

Just a quick one. I have a MacBook pro late 2008. I diagnosed dry bga connections to the SMC chip. I reflowed the SMC and it worked fine for a day or two, then went back to not powering up again. I tried another reflow which worked, but it went the same way again. This must be due to the center heatsink expanding and lifting the SMC slightly.. I'm going to have to remove the SMC chip and reball it with leaded BGA balls for a more permanent fix. Does anyone know the size of the balls needed for this?

Why not just order another SMC chip? Would be easier I see them on ebay around $7-10 bucks.

 

[triplelucky]

Does anyone have the schematics and .brd file for the J30 Logic board 820-3115 it's a Mid-2012? I am willing to pay for it if you have the board view file. Because I have a macbook that will only work on battery. No green light on adapter. It will only power on the macbook with ac adapter if you do a smc reset. Board had tiny water spilled on the magsafe. I have tried a working DC board but still no luck.

It looks like you can get a schematic and a .brd for that board for $3.99 from the guy on eBay that you can find if you search for “laptop schematics”.

 

[code600]

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.

 

[dellxps15]

Finaly I change U4900 and now the system detect the battery and charge the battery, thank for all,

hi, i have to replace the u7000 chip and the new one wont solder properly. i have to put some solder paste (the white acid one) before solder it or is it me that is not good? i put flux and so on, but tin wont attach to the new chip pins....

 

[Leehs]

Why not just order another SMC chip? Would be easier I see them on ebay around $7-10 bucks.

I did think about that, but had trouble finding a U4900 for a late 2008 MacBook pro. I'm assuming they would come pre-balled? Do you have any supplier info perchance? I'm struggling to find the part here in the UK

*edit*

I found some on ebay..

My part number is:
F2117LP
20H V
AGO9982
0831JPN

The closest part number I found on ebay is:
F2117LP
20H V
AG08128
0830JPN

Will this work? The bottom 2 codes are slightly different - I'm not sure what they are. Also I'm assuming the chip may have to be programmed?

 

[Wuchi]

Hello!

I'm new to this forum and this is my first post.

I bought a water spilled mbp 13" mid 2010. I've been cleaning it up and this is the situation at the moment.

Mbp works fine when battery operated. Now the battery is low charge.
It doesn't boot with magsafe. Only when smc is bypassed, it starts and the fan is going on full speed.
No light on magsafe, and it doesn't charge battery.
Dc in board gives 16,5v to logic board.
The fuse near battery is 0 when the battery is out and 11,5v when battery is on.
G3hot is 3,2v when battery is on. Haven't measured yet so much. But I will continue today.

Any help is welcomed

 

[code600]

I did think about that, but had trouble finding a U4900 for a late 2008 MacBook pro. I'm assuming they would come pre-balled? Do you have any supplier info perchance? I'm struggling to find the part here in the UK

*edit*

I found some on ebay..

My part number is:
F2117LP
20H V
AGO9982
0831JPN

The closest part number I found on ebay is:
F2117LP
20H V
AG08128
0830JPN

Will this work? The bottom 2 codes are slightly different - I'm not sure what they are. Also I'm assuming the chip may have to be programmed?

As long as the first 2 lines are the same they should be fine. You don't need to program them. I buy them from ebay new and they are plug and play.

----------

Hello!

I'm new to this forum and this is my first post.

I bought a water spilled mbp 13" mid 2010. I've been cleaning it up and this is the situation at the moment.

Mbp works fine when battery operated. Now the battery is low charge.
It doesn't boot with magsafe. Only when smc is bypassed, it starts and the fan is going on full speed.
No light on magsafe, and it doesn't charge battery.
Dc in board gives 16,5v to logic board.
The fuse near battery is 0 when the battery is out and 11,5v when battery is on.
G3hot is 3,2v when battery is on. Haven't measured yet so much. But I will continue today.

Any help is welcomed

Check your ISL6258 chip. I believe your suppose to receive 12V on the battery fuse without the battery plugged in.

 

[Wuchi]

Check your ISL6258 chip. I believe your suppose to receive 12V on the battery fuse without the battery plugged in.

What kind of voltages I should get? I checked the pin 14 and it has 3,4v.

 

[triplelucky]

I have an 820-2530-A K24 board that I have been working on. It was originally in with problem works fine with third party charger but won’t work with Apple charger.

With the Apple charger just a blinking or dim green light. No operation on AC This was eventually resolved by finding a bad solder joint on pin 1 of R7099 and AC operation and charging functions restored.

Good deal. Button it up and life is good…. Not so fast.

AC operation is good but now no power on battery alone . (Was fine on battery alone before). Back on the bench.

G3hot on battery operation alone is now 1.3V on the power on test pads and 2.3V on pin 1 of C6990. 12.4 V on pin 3 of D6905. G3hot returns to normal 3.42V with Charger applied.

So the mystery now is why is G3hot now low on battery only? I suppose I could pull L6995 and see if G3hot goes back up to 3.4V On battery and rule out a bad 3-4 diode on D6905 but I am thinking its something else in the battery operation only circuits that is slightly pulling down G3hot now.

Any ideas appreciated

Thanks.

 

[cmdrdata]

I have an 820-2530-A K24 board that I have been working on. It was originally in with problem works fine with third party charger but won’t work with Apple charger.

With the Apple charger just a blinking or dim green light. No operation on AC This was eventually resolved by finding a bad solder joint on pin 1 of R7099 and AC operation and charging functions restored.

Good deal. Button it up and life is good…. Not so fast.

AC operation is good but now no power on battery alone . (Was fine on battery alone before). Back on the bench.

G3hot on battery operation alone is now 1.3V on the power on test pads and 2.3V on pin 1 of C6990. 12.4 V on pin 3 of D6905. G3hot returns to normal 3.42V with Charger applied.

So the mystery now is why is G3hot now low on battery only? I suppose I could pull L6995 and see if G3hot goes back up to 3.4V On battery and rule out a bad 3-4 diode on D6905 but I am thinking its something else in the battery operation only circuits that is slightly pulling down G3hot now.

Any ideas appreciated

Thanks.

Do you see 12v on pin 4 and 5 (they are tied together) of D6905? If not, then D6905 is bad, or you may have a bad solder joint there.

 

[triplelucky]

cmdrdata

Thanks for your input.

i now see that the pin 3-4 diode in D6905 reads open so I will replace it. So maybe not so much of a mystery after all.

It must have been an unintended consequence of something I did along the way to figuring out the original problem.

PS I have read your previous post’s over many times over the past year and have learned a lot from the information you have provided.

So a good opportunity to say thanks.

 

[Wuchi]

I am not sure what solder spots you are measuring. However, look at my attached image. You should be able to read 18.5V at the point noted. If you do not have 18.5V there then I think your magsafe board needs to be replaced (or cleaned if it is liquid damaged).

I'm havin 0v here when only magsafe is connected. When battery is connected, there is 12v (if I remember it right), but the point is, there is no voltage here when magsafe is connected. So it could mean a bad dc board? I bought one last night, so now I have to wait.

Thanks.

Edit. The magsafe is communicating with smc because it is giving 16,5v. But there is something wrong with that area.

 

[cmdrdata]

I'm havin 0v here when only magsafe is connected. When battery is connected, there is 12v (if I remember it right), but the point is, there is no voltage here when magsafe is connected. So it could mean a bad dc board? I bought one last night, so now I have to wait.

Thanks.

Edit. The magsafe is communicating with smc because it is giving 16,5v. But there is something wrong with that area.

if you have 16.5v or greater anywhere in the logic board with magsafe connected, your DCIN board is most likely good.

 

[Wuchi]

if you have 16.5v or greater anywhere in the logic board with magsafe connected, your DCIN board is most likely good.

Actually the only 16,5v is measured from dc in board pins, not on logic board. I have 11,5v on the board when battery is connected.

I'll open it up today do some measurements.

Thanks!

 

[Wuchi]

Should the dc in board have 3,4v in the middle pin( the five pins that are in row)? My dc in board shows 0v in there but from logic board the dc in connector has 3,4v.

The fuse near magsafe connector is ok, 16,5v there.

What I think was d6905 had 3,4v in pins 4 and 5 and 0v in pins 1,2 and 3.

This with magsafe.

Edit. Nope, it wasn't the d6905 it was a similar part on the same side of the board just beside the magsafe connector on logic board. What is it?

I will open it up again tomorrow.

 

[cmdrdata]

Should the dc in board have 3,4v in the middle pin( the five pins that are in row)? My dc in board shows 0v in there but from logic board the dc in connector has 3,4v.

The fuse near magsafe connector is ok, 16,5v there.

What I think was d6905 had 3,4v in pins 4 and 5 and 0v in pins 1,2 and 3.

This with magsafe.

Edit. Nope, it wasn't the d6905 it was a similar part on the same side of the board just beside the magsafe connector on logic board. What is it?

I will open it up again tomorrow.

DCIN board has the two outer pins (1/5) and next two outer pins (2/4) carrying the DC voltage (16.5v nominal). The center pin is the sense pin and if plugged in to the logic board with power applied, if G3HOT is working (either via battery or magsafe) will then pull that pin up to around 3.4v. This is the bidirectional communication line between the magsafe and SMC via serial pulse data.

The 5 pins, as connected to the logic board gets re-arranged on the logicboard side so the 2 pins are V+ and 2 pins are V-/GND. the remaining pin the the SENSE pin I mentioned above.

Whether the SMC is communicating or not to the magsafe, if the magsafe sense that there is a reasonable load on the V+ line, it will enable outputting the 16.5v so that G3HOT can be powered up even when battery is not present.

Look at the schematic: 16.5v (P18V5_DCIN_CONN) goes thru F6905, then R6905, then D6905-pin1. So this voltage if present should also show up at D6905 pin 4/5 as a reduced voltage near 12v.

If battery is also present, then battery voltage goes directly to pin 3 and the diode to join pin 4/5. So this is how G3HOT is "always" hot/on to power the SMC.

 

[Rayrayrr]

Hey guys,
Just got to say WOW, to all the content in this thread! crazy!

Just wondering if anyone can give me assistance with my Macbook pro.
the other day i tested a charger out on my laptop, which i saw it short out when i removed it. my Macbook immediately shut off and needed 10-20 seconds to be able to be turned back on.

Basically my macbook:
-Does not charge (occasionally does if it shorts out first :S ) See youtube video
http://www.youtube.com/watch?v=M2Pg96FG-hs (not mine but exact same thing)
-Keyboard lights not working
-Does not run soley off AC (unplugged battery left the magport in)

It does however:
-Run off the battery fine.
-Battery indicators work
-every things else functions normally.

May have a feeling it is a MOSFET or something related to the SMC...
im almost certain it would not be a fuse or anything that bad since the charger would work occasionally when fiddled with (shorting out).

I have tried multiple chargers, have had my DC Board replaced. have not tried another battery as i didn't think it may be necessary since the battery works fine its more or less the charger side of things.

Details about the Macbook.
Macbook Pro 15" late 2011
MacBookPro8,2
i7-2.2
serial: C02GW0WCDV7N

Very grateful if someone can help