It doesnt looks like pin 9 BY P of U6990 is being used to power a mosfet and is bypassed to ground. So would it make any sense to remove L6995 and confirm that you have 3.4 V present at U6990 pin 6 with the circuit disconnected from the PP3V42_G3H rails before spending a lot of time looking for a short somewhere there?
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SMC Issue on MBP 13 - Hardware Troubleshooting Guide
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It doesnt looks like pin 9 BY P of U6990 is being used to power a mosfet and is bypassed to ground. So would it make any sense to remove L6995 and confirm that you have 3.4 V present at U6990 pin 6 with the circuit disconnected from the PP3V42_G3H rails before spending a lot of time looking for a short somewhere there?
I just de-soldered L6995 and still no 3.4V on pin 6. How is that possible? I already replaced U6990 with a know good working one.
It looks like pin 9 (BYP) of U6990 is still connected to PP3V42_G3H on the other side of L6995 even with L6995 out. BYP is described as a fixed output voltage. Possibly someone with a better understanding of how the PM6644 works can take a look and see if simply removing L6995 would isolate the U6990 from the PP3V42_G3H rail to check the voltage or not.
I just de-soldered L6995 and still no 3.4V on pin 6. How is that possible? I already replaced U6990 with a know good working one.
Hi,
U6990 is a buck regulator - the inductor (L6995) is a vital part of the circuit. By removing it you will be able to look for shorts on the line but you won't generate the 3.4v without it. Check the output smoothing capacitor (C6999) as I have had this be the cause of a shorted G3Hot line before.
Regards,
Chigwelldave.
I removed C6999 and found out it is broken But the solderpads are still shorted
Also tried removing and measuring C6994 but that one seems to be OK.
So there must be a short somewhere else on the board to G3Hot, are there more common parts which can cause this short?
But the solderpads are still shorted Also tried removing and measuring C6994 but that one seems to be OK.
So there must be a short somewhere else on the board to G3Hot, are there more common parts which can cause this short?
Thanx for the photo man, I think this one is missing from my logic board. I inspected it entierly and no corosion, all components looks fine to me, only this component is missing ... What could be this one ???
Attachments
That is the fuse for the backlight. If it is missing you will have no backlight. It is a 2 Amp 32V 0603 package. Unless that is a 15" display in which case it is a 3 Amp fuse.
Fuse you say. ooh man those fuses are my specialty. Can I put any fuse in the time that the right one arrive or it is critical to put the one that it shoud be puted ???
It is important to use a fuse with the right characteristics. Too low an amperage and it will blow under normal operation. Too high and it will not blow in a fault condition causing damage to the components that it is meant to protect.
When I order from Digikey I usually have the order within 1 or 2 days. Best to wait and not risk it.
I will start to think the problem of my mbp again.
So the facts:
Mid 2010 13" mbp water spilled. Keyboard and dc in board replaced.
-works perfectly with battery
-green light in magsafe(not original, chinese copy)
-does not charge. When magsafe is connected while mbp is on, it says for half a minute that it is charging, but then again turns to not charging. No amber light at any time.
-doesn't run with magsafe only, except in bypass mode.
-There is 16,5V in logic board.
Any ideas where to look? I have tried to measure here and there, but haven't got a glue what to search. There is g3h voltage.
Thank you!
So the facts:
Mid 2010 13" mbp water spilled. Keyboard and dc in board replaced.
-works perfectly with battery
-green light in magsafe(not original, chinese copy)
-does not charge. When magsafe is connected while mbp is on, it says for half a minute that it is charging, but then again turns to not charging. No amber light at any time.
-doesn't run with magsafe only, except in bypass mode.
-There is 16,5V in logic board.
Any ideas where to look? I have tried to measure here and there, but haven't got a glue what to search. There is g3h voltage.
Thank you!
Whether powered by magsafe only or battery only or both, G3HOTmust always be present. Since the system runs fine on battery alone, then you need to see if G3HOT is ok if running on magsafe only. If you don't have G3HOT then the problem is the input from magsafe to U6990 (G3HOT regulator). If G3HOT is ok, then trace the 16.5v through several power FETs that feeds/generate the 12v main power (Start from fuse F7000 and keep working backward).
G3Hot is present when only magsafe is connected. I have trouble locating the power fets. There is (if I am right) one power fet near the dispaly connector. Four pins on otuer side and four on the other side that are connected together(?). The ones that are connected show 16,5v whenmagsafe is connected, but after few seconds, start to go dpown to 0v.
This is such a contradictory state. Without G3HOT on battery alone, how can the system start and run normally because G3HOT is the one that powers the SMC (and thus tell the rest of the system that all system components downstream of F7000 are OK) and all I2L bus (SDA/SCL) lines for status communication. For example, the two test point start pads: one is GND and the other a line that goes to the SMC pulled up to 3.42v via a resistor to G3HOT. The action of s temporarily shorting this two pads in effect pulsed the line to tell the SMC to start the system. If 3.42v is not there the pulse signal will not exist.
Push the test button of the battery, if no light, you need new SMC Chip and new u7000 chip.
I think I said it wrong. I meant that when magsafe is connected, and no battery, the G3HOT is present. It is also present when battery is connected. Sorry my english.
Coco666:
The battery light indicator was working ok, but I managed to broke the wire that goes to the logic board so now it is not working. I have it connected still.
Coco666:
The battery light indicator was working ok, but I managed to broke the wire that goes to the logic board so now it is not working. I have it connected still.
OK, since G3HOT is present all the time the problem is power flow of magsafe to the system
For K90i. the magsafe power (16.5v) flow through Q7085 -> Q7080 -> R7020 -> Q7030 (Drain side)
Then U7000 regulate the gates of Q7030 and Q7035, so that Q7030(S) and Q7035(D) becomes 12v which then flows to ->L7030 -> F7040 -> system
Note that battery power (12v) goes through Q7055 -> R7050 -> F7040 -> system. And the SMC is the one the manage the turn on/off of Q7055. I think that you are not getting the 12v at F7040 when only magsafe is connected.
Macbook Pro 13 inc 820-3115-b
I have an early/mid 2013 macbook pro with a liquid spill. I have removed the motherboard and cleaned it thoroughly, tried SMC NVRAM reset. Tried to unplug all the possibilities that could lead to this, but the results are the same. When the Magsafe adapter is plugged in the machine turns on, the led turns on , but no sound no video output, the fans start spinning slowly and then reach maximum speed. Does anybody have any ideas what can cause this issue, are there power pads on this model , i cannot find anything related on this model since its 2013. A schematic would be really helpful.
Thank you guys. This thread helped me revive 2 mac book pros already.
I have an early/mid 2013 macbook pro with a liquid spill. I have removed the motherboard and cleaned it thoroughly, tried SMC NVRAM reset. Tried to unplug all the possibilities that could lead to this, but the results are the same. When the Magsafe adapter is plugged in the machine turns on, the led turns on , but no sound no video output, the fans start spinning slowly and then reach maximum speed. Does anybody have any ideas what can cause this issue, are there power pads on this model , i cannot find anything related on this model since its 2013. A schematic would be really helpful.
Thank you guys. This thread helped me revive 2 mac book pros already.
Attachments
On the K90i board I have, which will not power on (G3HOT is present and green light on magsafe) I did some more measurements today. I found out the around U7200 I do not get the 5V but a very unstable current. I already replaced U7200 but still no luck.
P3V3S5_DRVH and P3V3S5__EN_L are also very unstable. Did someone got this problem before, or knows a method how to fix it?
P3V3S5_DRVH and P3V3S5__EN_L are also very unstable. Did someone got this problem before, or knows a method how to fix it?
15" mid 2010 MacBook Pro
Hi there,
I have a 15" mid 2010 MacBook Pro with some power / charging issues. The machine was connected to a dodgy amp via the headphone jack when the damn thing short circuited and died almost killing my beloved mac!
The laptop is functional, it runs from battery (also battery indicator works) but does not charge the battery, and it also runs from the mains if the battery is removed. BTW the original charger is completely dead, I am using a spare.
I have replaced the DC-IN MagSafe connector thingy as it was cheap and easy to do. After the replacing it I did manage to get the battery charging again, but it was unstable. When I removed the MagSafe the whole thing reset and didn't start again for some time. Also I couldn't adjust the screen brightness. I read it on some forum that resetting SMC might help but it didn't: since then I haven't managed to get charging at all.
The other weird thing is the machine runs just fine on mains if I remove the battery, but after I shut it down and disconnect/reconnect the MagSafe it won't start again for a long time. If I short circuit the MagSafe pins for bit (charger disconnected, battery removed) then I plug the MagSafe back the machine will start up right on!
I tried reading through the previous posts, but there are just too many of them to find what could be relevant to this issue.. any suggestions anyone where to start looking? How could I isolate the faulty component? Anyone knows about a schematic to this model?
I'd appreciate any help, thanks!
(Sorry about the long post)
Hi there,
I have a 15" mid 2010 MacBook Pro with some power / charging issues. The machine was connected to a dodgy amp via the headphone jack when the damn thing short circuited and died almost killing my beloved mac!
The laptop is functional, it runs from battery (also battery indicator works) but does not charge the battery, and it also runs from the mains if the battery is removed. BTW the original charger is completely dead, I am using a spare.
I have replaced the DC-IN MagSafe connector thingy as it was cheap and easy to do. After the replacing it I did manage to get the battery charging again, but it was unstable. When I removed the MagSafe the whole thing reset and didn't start again for some time. Also I couldn't adjust the screen brightness. I read it on some forum that resetting SMC might help but it didn't: since then I haven't managed to get charging at all.
The other weird thing is the machine runs just fine on mains if I remove the battery, but after I shut it down and disconnect/reconnect the MagSafe it won't start again for a long time. If I short circuit the MagSafe pins for bit (charger disconnected, battery removed) then I plug the MagSafe back the machine will start up right on!
I tried reading through the previous posts, but there are just too many of them to find what could be relevant to this issue.. any suggestions anyone where to start looking? How could I isolate the faulty component? Anyone knows about a schematic to this model?
I'd appreciate any help, thanks!
(Sorry about the long post)
G3hot issues
Hi, i have a i5 2011 A1278 Logic board here, and im having G3hot issues.
Naturally G3hot doesnt run through the system on battery (havent tried mains)
and i noticed i wasnt getting any voltage on part of the charging circuit, so i whipped this out and replaced it.
Viola G3hot again, running albeit a little high at 3.5v.
Press the power button. its only reaction was to kill the new charging ic i had installed.
No g3hot anymore...
Anyone come across the charging ic (u700) blowing or could point me in the direction that may cause it? Thanks allot.
Hi, i have a i5 2011 A1278 Logic board here, and im having G3hot issues.
Naturally G3hot doesnt run through the system on battery (havent tried mains)
and i noticed i wasnt getting any voltage on part of the charging circuit, so i whipped this out and replaced it.
Viola G3hot again, running albeit a little high at 3.5v.
Press the power button. its only reaction was to kill the new charging ic i had installed.
No g3hot anymore...
Anyone come across the charging ic (u700) blowing or could point me in the direction that may cause it? Thanks allot.
Mid-2012 MBP 13" Powering issues
Hello everyone!
MacBook pro 13" Mid-2012: 2.5ghz
Signs:
1.) MBP - must be plugged in to wall charger - then the battery indicator button must be pressed over and over until all 8 green light LEDs flash on -- IMMEDITALEY the power button is pushed -- **this is ONLY way it powers on.
2.) MBP - Will charge the battery! (battery is 96%) ** lion osx screen shows battery health: (CHARGED)
3.) When unplugged from wall, the battery indicator shows zero green lights. MBP will not power on. (as if I have dead battery?)
4.) While plugged in and powered on, if the L-shape magsafe charger is pulled out the MBP IMMEDITALEY shuts down.
5.) While plugged in, the L-shape magsafe charger shows a green kind of lightly flicking light.
6.) Replaced battery with another..it charged it up, but SAME symptons.
7.) Noticed a small tear on one of the 5 small wires in MAGSAFE DC-IN POWER JACK BOARD CABLE 820-2565-A. *(Ordered brand new one just now..)
8.) When plugged in to wall charger, I can hear a QUIET TICKING noise where charger plugs into computer.. what the hell?
9.) EVERYTHING WORKS fine when *plugged in and powered on* ( fans spin correctly, no overheating issues, everything works like normal.
I have been trying for 4 months now to get this back into a laptop. It is a expensive desktop ATM...
ALL signs lead towards a possibly fix I believe...maybe the new DC-in board jack will work??
CMDRDATA: you went through what appears to be my issues, the DC in-board fixed your computer?? how did you get it to boot from battery again. That MBP 2009
Conclusion: Logic board will not run from battery although it charges it..
Thanks for help everyone,
Chris
Hello everyone!
MacBook pro 13" Mid-2012: 2.5ghz
Signs:
1.) MBP - must be plugged in to wall charger - then the battery indicator button must be pressed over and over until all 8 green light LEDs flash on -- IMMEDITALEY the power button is pushed -- **this is ONLY way it powers on.
2.) MBP - Will charge the battery! (battery is 96%) ** lion osx screen shows battery health: (CHARGED)
3.) When unplugged from wall, the battery indicator shows zero green lights. MBP will not power on. (as if I have dead battery?)
4.) While plugged in and powered on, if the L-shape magsafe charger is pulled out the MBP IMMEDITALEY shuts down.
5.) While plugged in, the L-shape magsafe charger shows a green kind of lightly flicking light.
6.) Replaced battery with another..it charged it up, but SAME symptons.
7.) Noticed a small tear on one of the 5 small wires in MAGSAFE DC-IN POWER JACK BOARD CABLE 820-2565-A. *(Ordered brand new one just now..)
8.) When plugged in to wall charger, I can hear a QUIET TICKING noise where charger plugs into computer.. what the hell?
9.) EVERYTHING WORKS fine when *plugged in and powered on* ( fans spin correctly, no overheating issues, everything works like normal.
I have been trying for 4 months now to get this back into a laptop. It is a expensive desktop ATM...
ALL signs lead towards a possibly fix I believe...maybe the new DC-in board jack will work??
CMDRDATA: you went through what appears to be my issues, the DC in-board fixed your computer?? how did you get it to boot from battery again. That MBP 2009
Conclusion: Logic board will not run from battery although it charges it..
Thanks for help everyone,
Chris
Hi MacCafe,
Sounds like you are not getting G3Hot on battery. I don't have any 2012 schematics but, if it is similar to all the other models, there is a SMD double diode feeding Magsafe and battery power to the G3Hot regulator. I'd be checking that first. Also, without the Magsafe plugged in, check the main fuse (F7040 on the 2011 model) to see if you have battery power available.
Good luck,
Chigwelldave.
Sounds like you are not getting G3Hot on battery. I don't have any 2012 schematics but, if it is similar to all the other models, there is a SMD double diode feeding Magsafe and battery power to the G3Hot regulator. I'd be checking that first. Also, without the Magsafe plugged in, check the main fuse (F7040 on the 2011 model) to see if you have battery power available.
Good luck,
Chigwelldave.