Check the signal ALL_SYS_PWRGD. This is a status to the CPU that ensure that all other secondary power supply are up and stable.
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SMC Issue on MBP 13 - Hardware Troubleshooting Guide
- Thread starter Dadioh
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Check the signal ALL_SYS_PWRGD. This is a status to the CPU that ensure that all other secondary power supply are up and stable.
You are amazing. I checked the test point for that line and it says up and down but 10mv. Is that supposed to be a 3.4 line also.
For the system to power up, this signal must be a logic one, and yes, somewhere about 3.4v
Ok thank you, so do I go back further to the point just before like mcp power good
Yup. Standard troubleshooting is to backtrack until you find out which signal/power supply is causing ALL_SYS_PWRGD to stay at logic zero instead of logic one (meaning good state). See picture. This is for an A1278 MBP13U Mid 2009 (K24 820-2530).
Once you know which one it is, then trace that specific supply and figure out what caused it to have a bad status.
Attachments
Ok Ive attached the first thing I checked looks funny I will try other later tonight
Ok I did more. I wonder if it could be around the part I circled.
Attachments
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Mba 11 2010
Hello again my friends!
Another laptop, another problem.
I have a MBA 11 2010 with spilled wather. I can start the machin but no chime and no video. The fan speed increasing fast. Battery will charged.
No light on Caps lock, but Smc reset can be made.
Any Idea?
I have schematic and board view of this model.
Thanks a lot Guys!!!!
Hello again my friends!
Another laptop, another problem.
I have a MBA 11 2010 with spilled wather. I can start the machin but no chime and no video. The fan speed increasing fast. Battery will charged.
No light on Caps lock, but Smc reset can be made.
Any Idea?
I have schematic and board view of this model.
Thanks a lot Guys!!!!
Another hint on power issue (just a guess because that's what I had done when doing logic circuit design many many years ago): I think that when Apple label signals in their schematic they use "_L" and "S#" to indicate "logic 0" level and "staging sequence". Thus if I see a label that says SOME_GOOD_SIGNAL_L, I believe that this GOOD_SIGNAL is true if it is 0v. Furthermore of I see POWER_X_S0 and POWER_X_S1, that means to me POWER_XS0 has to come up first before S1 comes up. So, in your case, if you see something with S3 looked incorrect, but another power source with S0 also looked incorrect, I'd focus on the one with S0 first and determine why it is bad. It could be that S3 is OK, but will not be enabled until S0, S1 and S2 states are correct.
PS: Ace2000, please pay attention to the measurements that Techkat shown on the G3HOT circuit on the power system architecture block diagram, those voltages in blue are what you should see if magsafe, battery, D6950, U6990 etc are working correctly.
Hi CMDR,
Ok so if I understand you right then I should not start where I am go back to what you circled, those are all s0. I was trying to figure out where those lines where. I was having a hard time. That's when I figured follow the power on page 3 start from beginning.
MacBook UniBody M97
Hello!
I'm new to the forums, and have some topic related questions.
i just got my hands on a MacBook non-pro UB laptop.
Liquid damage, wont start.
after cleaning the board (DC-in board to battery axle got some marks) it started up with battery in normal mode(not smc bypass).
magsafe won't light up and won't charge battery, OSX can't even detect the charger neither on the menu-bar, nor on the system profiler, changing the DC-in to a new one has no effect.
I can measure voltage on the fet on the top-right corner(next to the ethernet), but it alternates, so unstable between 7 and 12 volts(one of the pins is burnt, but has another two on the same pcb trace).
where do i have to start?
do i have to replace corroded-leg tantalum capacitors?
i have a 1278 pro board as well, but first i want to finish the m97 one.
greetings
Zsolt
Hello!
I'm new to the forums, and have some topic related questions.
i just got my hands on a MacBook non-pro UB laptop.
Liquid damage, wont start.
after cleaning the board (DC-in board to battery axle got some marks) it started up with battery in normal mode(not smc bypass).
magsafe won't light up and won't charge battery, OSX can't even detect the charger neither on the menu-bar, nor on the system profiler, changing the DC-in to a new one has no effect.
I can measure voltage on the fet on the top-right corner(next to the ethernet), but it alternates, so unstable between 7 and 12 volts(one of the pins is burnt, but has another two on the same pcb trace).
where do i have to start?
do i have to replace corroded-leg tantalum capacitors?
i have a 1278 pro board as well, but first i want to finish the m97 one.
greetings
Zsolt
Hi Commander,
I haven't been able to work on board until an hour ago and I am totally blown away haven't touched it and now when I plug in to adapter green light flashing on and off at timed intervals. Checking voltage, sure enough highest is 2 or 3 v. Pulled battery out of drawer and plugged in, light went solid but very faint green no orange, Took readings then at different key locations and they represent 12.5 volts down by battery, 11 volts up by mosfet on top side by video connector. Q7001, but at lease they are not jumping up and down in a timed sequence. so I am totally lost now, if you have any ideas when you get a chance .. Thank you.
You didn't say, but I assume it will not start with/without battery? If that is the case, go from the beginning (same area I mentioned to ace2000). Perhaps your G3HOT is shorted again. I will be out of town for the next week and will not have internet access at Carlsbad Caverns. Good luck.
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If the SMC does not detect the presence of magsafe, of course charging will not take place. You must have at least a green LED (indicating SMC knows magsafe is plugged in, and G3HOT sourced by magsafe as opposed to by battery) is OK.
If you have a component with burned leg, you gotta fixed that first before doing anything else. Replace with matching part.
received all the components i need except 348k resistor, nobody seems to stock these, I take it you have got to use this value? and there is no substitute?
thanks Justin
enjoy you vacation cmdrdata, looked the caverns up on google WOW you are so lucky....
thanks Justin
enjoy you vacation cmdrdata, looked the caverns up on google WOW you are so lucky....
Recall the equation I gave you Vout = 3.42v = (R6995+R6996) x 1 .25v / R6996
So if you change R6995 to another value close to it, calculate R6996 so that the resulting output stays at 3.42. Don't change to higher or lower value too much as it will draw too much current from U6990. Just arrived in Carlsbad a couple of hours ago. Luckily the hotel has courtesy PC to use by guests.
replace the vishnay fet Check back to one of my posts where dadioh gave me the part number
and also check white fuse next to dc power in for consistency, should read 0hms ... (Big white one)
i have a 1278 pro board as well, but first i want to finish the m97 one.
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saving this!
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13.3 Core i5 Laptop MC700 (Feb 2011
power from mains and chargers reading are good .
boots good
however does not power up from battery or remain powered by battery
as to techkats reading.... my reading from bat are 11.58v shy by 1.0v
reasons for this?
thanks guys
Hi Everyone,
Im good with the 3.4v now there was a resistor on one end that came off. Wierd. Anyhow back to the ALL_SYS_PWRGD. Ive tried to trace and really not sure where I should be. If anyone has any suggestions I would appreciate it. Thank you again
Thanks cmdrdata, my imac has now gone down as well lol, so I am having to use my iPhone, so can't get to my schematics or anything, I think it's just the hard drive so I will test what you say in a couple of days when my computer is running again lol, wow these things are sent to try us 
(The IC actually reads .6 with the charger plugged in and .52 without the charger. 0.00V is on pin 15)
Well, here's another one.
It runs on battery, the MagSafe is dim green.Somehow the line for the 11.33V to charge the battery is cutoff.
What is the capacitor that reads .0V for, and where is it supposed to be connected to? Also, is there any harm in jumping the 11.33V to the 10.9V terminals on the battery to charge it a bit so I can see what AHT say about it?
(The IC actually reads .6 with the charger plugged in and .52 without the charger. 0.00V is on pin 15)
Well, here's another one.
Somehow the line for the 11.33V to charge the battery is cutoff.
What is the capacitor that reads .0V for, and where is it supposed to be connected to? Also, is there any harm in jumping the 11.33V to the 10.9V terminals on the battery to charge it a bit so I can see what AHT say about it?
Pin 14 on the charger must be 3.4v or you will not get any charging. That is the OK signal from the charger back to the SMC. Your charger ISL6258 (2009 model) or ISL6259 (2010 2011) is probably bad and needs replacement.
Thanks, I've ordered the ISP6259AHRTZ and report back once I've relplaced it.
But in the meantime, could there be any further reason to investigate as to why the IC doesn't pull up pin 14 before replacing it?
Edit:
I saw on page 22 that the center pin on the MagSafe is supposed to have 3V, and although I swapped the DC-in board it reads either 0V or fluctuates around 0.6V. Could it be that I replaced a faulty DC-in board with another faulty DC-in board, or that there is a blown component somewhere between pin 3 of the MagSafe and the charger IC?
I also measured the pads around the SIL6259A and all voltage levels (10.9V from the battery, 11.3V from the FET near the MagSafe, 16.35V from the MagSafe and 3.4V from G4Hot) are present, so I assume that all it takes for the circuit to work is for the IC pulling up OK and OR the voltages.
(the first one without all those anotations, in case somebody may need it in the future)
The problem here is that for whatever reason (besides ACOK being low) UGATE is not opening. Does anything other than the ISL6259 itself look suspicious to you?
But in the meantime, could there be any further reason to investigate as to why the IC doesn't pull up pin 14 before replacing it?
Edit:
I saw on page 22 that the center pin on the MagSafe is supposed to have 3V, and although I swapped the DC-in board it reads either 0V or fluctuates around 0.6V. Could it be that I replaced a faulty DC-in board with another faulty DC-in board, or that there is a blown component somewhere between pin 3 of the MagSafe and the charger IC?
I also measured the pads around the SIL6259A and all voltage levels (10.9V from the battery, 11.3V from the FET near the MagSafe, 16.35V from the MagSafe and 3.4V from G4Hot) are present, so I assume that all it takes for the circuit to work is for the IC pulling up OK and OR the voltages.
(the first one without all those anotations, in case somebody may need it in the future)
The problem here is that for whatever reason (besides ACOK being low) UGATE is not opening. Does anything other than the ISL6259 itself look suspicious to you?
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Thanks, I've ordered the ISP6259AHRTZ and report back once I've relplaced it.
But in the meantime, could there be any further reason to investigate as to why the IC doesn't pull up pin 14 before replacing it?
Edit:
I saw on page 22 that the center pin on the MagSafe is supposed to have 3V, and although I swapped the DC-in board it reads either 0V or fluctuates around 0.6V. Could it be that I replaced a faulty DC-in board with another faulty DC-in board, or that there is a blown component somewhere between pin 3 of the MagSafe and the charger IC?
I also measured the pads around the SIL6259A and all voltage levels (10.9V from the battery, 11.3V from the FET near the MagSafe, 16.35V from the MagSafe and 3.4V from G4Hot) are present, so I assume that all it takes for the circuit to work is for the IC pulling up OK and OR the voltages.
(the first one without all those anotations, in case somebody may need it in the future)
The problem here is that for whatever reason (besides ACOK being low) UGATE is not opening. Does anything other than the ISL6259 itself look suspicious to you?
just an idea from looking at the measurements around the ISL6259: Do you know if you have G3HOT when powering from MAGSAFE only? My understanding is that the ISL6259 is only minimally powered when the G3HOT is derived from battery power, thus all the power FETs in the charging circuit will be OFF (e.g., UGATE reading 0v, etc.)
G4Hot was 3.4 on both battery and MagSafe only - but the ISL6259A just burnt a hole at about pin 16, so I guess that I've found the problem.
I've disconnected the battery and I hope that nothing was damaged other than the IC (and maybe Q7055/R7010/R7011) and I'll have to wait for the new IC to arrive now.
I'll let you know how this turns out, thanks for the help.
I've disconnected the battery and I hope that nothing was damaged other than the IC (and maybe Q7055/R7010/R7011) and I'll have to wait for the new IC to arrive now.
I'll let you know how this turns out, thanks for the help.
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See the attached "example" schematic from my Mid2009 MBP. ALL_SYS_PWRGD is an "OR-ed" signal of several power supply status. If it is low, then one of that power supply is probably not working, and you have to determine why. By this I mean go the respective supply and check the actual output line itself (not the status lines because it will logic zero due to the dragging down by the bad status) to see of the respective supply is putting out the correct voltage.
