RESQ-MYTECH
New member
Now I know I am going to get ribbed... so here goes. I am trying to deduce this with through logic but not getting it right, i don't think.
Above board.... magsafe charger goes from green to orange... indicates PPBUS_G3H and PP3v42_G3H is present. Hopefully I have that right. Board is not powering on. PPBUS_G3H is showing 1.3v and PP3v42_G3H shows 3.402v. So, issue is more than likely PPBUS_G3H as I believe it should be 8.4v. Looking at the schematic, PPBUS_G3H comes out from F7040. Pins 1 and 2 show the voltage there as being 1.3v Taking steps back next point is L7030 which reads 1.299v on both pins 1 and 2 ( ignoring the minor difference in the voltage). Step back again to Q7030, pin 7 appears to be in Q7030 but pin 1 on L7030 looks like it is directly linked to pin 23 on U7000. Pin 19 VDD is reading 5.067v so i know that is getting power and pin 20 is get 5.064v, thus meaning R7001 is doing its job. back to q7030, pins 3/4/5 are GND. Pin 1 CHGR_UGATE is showing 1.299v. Pin 6 CHGR_LGATE is showing 0.0v. Pin 2 PPDCIN_G3H_CHGR is showing 14.8v, which is the same voltage at pins 2 & 4 on j6900. pin 3 reads 3.304v which if i am correct in thinking should be 5v??? Now here is the kicker.... when in diode mode, reading PPBUS_G3H at any of the points shown on the NET command on openboardview for a short to ground I am getting 0.0 ohms and a constant beep. Which again if i am right indicates a short. But nothing is getting hot.
Next logical step for me is to grab a bench PSU, of which i do not have at this time, inject say 3v into PPBUS_G3H say at pin 2 on F7040 and obviously blk to GND and see what gets hot then... correct?
Or is all that I have done above, over complicated things and it is either U7000 or Q7030 thats the issue?
Thanks for any input given...
Above board.... magsafe charger goes from green to orange... indicates PPBUS_G3H and PP3v42_G3H is present. Hopefully I have that right. Board is not powering on. PPBUS_G3H is showing 1.3v and PP3v42_G3H shows 3.402v. So, issue is more than likely PPBUS_G3H as I believe it should be 8.4v. Looking at the schematic, PPBUS_G3H comes out from F7040. Pins 1 and 2 show the voltage there as being 1.3v Taking steps back next point is L7030 which reads 1.299v on both pins 1 and 2 ( ignoring the minor difference in the voltage). Step back again to Q7030, pin 7 appears to be in Q7030 but pin 1 on L7030 looks like it is directly linked to pin 23 on U7000. Pin 19 VDD is reading 5.067v so i know that is getting power and pin 20 is get 5.064v, thus meaning R7001 is doing its job. back to q7030, pins 3/4/5 are GND. Pin 1 CHGR_UGATE is showing 1.299v. Pin 6 CHGR_LGATE is showing 0.0v. Pin 2 PPDCIN_G3H_CHGR is showing 14.8v, which is the same voltage at pins 2 & 4 on j6900. pin 3 reads 3.304v which if i am correct in thinking should be 5v??? Now here is the kicker.... when in diode mode, reading PPBUS_G3H at any of the points shown on the NET command on openboardview for a short to ground I am getting 0.0 ohms and a constant beep. Which again if i am right indicates a short. But nothing is getting hot.
Next logical step for me is to grab a bench PSU, of which i do not have at this time, inject say 3v into PPBUS_G3H say at pin 2 on F7040 and obviously blk to GND and see what gets hot then... correct?
Or is all that I have done above, over complicated things and it is either U7000 or Q7030 thats the issue?
Thanks for any input given...