I've hade this computer roughly a year. Last months it started behaving irregularly. Powering off mid stride when on Battery, requiring power to be plugged in to boot even though Battery shows full when booted again, refused charging and power on at some point which I managed to get past by holding the power button pressed long among other things. I've never dropped it, and no liquids. As far as im concerned its in very good condition.
A few days ago, i powered it off, and 30 minutes later it was simply dead. No reaction on diodes on Brick Charger or usb Charger. Tried holding power buttons long etc. Its dead.
I've worked as a technician before fault searching on Component level to a small degree, but have little experience with modern laptops.
I have time on my hands and thought I might as well try to narrow down the larger area where something goes wrong, so I buy a multimeter and take it apart.
I believe the Mother board number is DAOZPUPIAE0 REV:E but this might be something else. I found it tricky to identify! I havent been able to get any schematic so im fumbling a bit in the dark.
What I have done, and what I have found out (or think i have found out, i mat have drawn the wrong conclusions somewhere):
1. Took off the backplate, disconnected Battery. Removed heat sinks.
2. Checked for obvious burned components or things that looks off. Nothing.
3. Tried measuring diode/resistance to check for shorts to any of the power rails (after learning what a power rail is). Found no obvious shorts.
4. Plugged in Charger to check voltages. Main power line is dead. Hard to find voltages at all on any obvious points like coils on the mb. I stop after a while.
5. Next plan is to trace incoming power. Mb recieves 19.5v though Charger. Good. This goes through a 8 pin mosfet (as far as I can determine). This feeds another 8 pin mosfet which is also open letting the 19.5v through. On the other side is another 8 pin mosfet which is not open. It has a low voltage to GND (0.8v~) on the gate. Im guessing something is wrong here but fail in tracing where the gate should get its power.
6. Im now on the deep end. I read up a bit more and learn that there is an IC that should be deciding whether to open the main power line depending on a number of factors.
7. I believe I have found the IC and try to measure for 5v or 3.3v close to it but dont really find anything. I concluded i dont know if the IC is even powered or not.
8. Since I couldnt Trace the gate of my closed mosfet on the upper side of the mb, i decided to undo and flip it.
9. After flipping the mb, a number of 3 pin mosfets (i think?) are revealed close to the Charger plug on the backside. After measuring there, I find a clear 3.3V signal, but no 5v signal, 9v and 19.5v. I fail trying to Trace the gate from my third mosfet on tha front side that is closed.
10. I find what I believe is the EC, and determine that it is powered by 3.3V.
Since then, I have found this forum, and im trying to determine what power Configuration my mb has. I will be trying again after trying to learn a bit more.
Current status is: power enters board but IC seems unpowered/unwilling to power the main line.
Any and all help that will support my learning journey here is greatly appreciated! Will try to post further findings in comments.
Pictures:
1. Mb front overview
2. Zoom on Charger plug area. Red numbers are 8 pin mosfets. Blue arrow is mosfet 3 gate. Purple area has 0v to GND. Yellow text is assumed IC. Red lines is areas powered by 19.5v to GND on front side of MB.
3. Zoom on on Charger plug area on the backside of MB. Here I found 3.3v among other things on the three pin mosfets(?) directly above the round 19.5v solder point.
A few days ago, i powered it off, and 30 minutes later it was simply dead. No reaction on diodes on Brick Charger or usb Charger. Tried holding power buttons long etc. Its dead.
I've worked as a technician before fault searching on Component level to a small degree, but have little experience with modern laptops.
I have time on my hands and thought I might as well try to narrow down the larger area where something goes wrong, so I buy a multimeter and take it apart.
I believe the Mother board number is DAOZPUPIAE0 REV:E but this might be something else. I found it tricky to identify! I havent been able to get any schematic so im fumbling a bit in the dark.
What I have done, and what I have found out (or think i have found out, i mat have drawn the wrong conclusions somewhere):
1. Took off the backplate, disconnected Battery. Removed heat sinks.
2. Checked for obvious burned components or things that looks off. Nothing.
3. Tried measuring diode/resistance to check for shorts to any of the power rails (after learning what a power rail is). Found no obvious shorts.
4. Plugged in Charger to check voltages. Main power line is dead. Hard to find voltages at all on any obvious points like coils on the mb. I stop after a while.
5. Next plan is to trace incoming power. Mb recieves 19.5v though Charger. Good. This goes through a 8 pin mosfet (as far as I can determine). This feeds another 8 pin mosfet which is also open letting the 19.5v through. On the other side is another 8 pin mosfet which is not open. It has a low voltage to GND (0.8v~) on the gate. Im guessing something is wrong here but fail in tracing where the gate should get its power.
6. Im now on the deep end. I read up a bit more and learn that there is an IC that should be deciding whether to open the main power line depending on a number of factors.
7. I believe I have found the IC and try to measure for 5v or 3.3v close to it but dont really find anything. I concluded i dont know if the IC is even powered or not.
8. Since I couldnt Trace the gate of my closed mosfet on the upper side of the mb, i decided to undo and flip it.
9. After flipping the mb, a number of 3 pin mosfets (i think?) are revealed close to the Charger plug on the backside. After measuring there, I find a clear 3.3V signal, but no 5v signal, 9v and 19.5v. I fail trying to Trace the gate from my third mosfet on tha front side that is closed.
10. I find what I believe is the EC, and determine that it is powered by 3.3V.
Since then, I have found this forum, and im trying to determine what power Configuration my mb has. I will be trying again after trying to learn a bit more.
Current status is: power enters board but IC seems unpowered/unwilling to power the main line.
Any and all help that will support my learning journey here is greatly appreciated! Will try to post further findings in comments.
Pictures:
1. Mb front overview
2. Zoom on Charger plug area. Red numbers are 8 pin mosfets. Blue arrow is mosfet 3 gate. Purple area has 0v to GND. Yellow text is assumed IC. Red lines is areas powered by 19.5v to GND on front side of MB.
3. Zoom on on Charger plug area on the backside of MB. Here I found 3.3v among other things on the three pin mosfets(?) directly above the round 19.5v solder point.
Attached Files
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