Macbook 13" A1278 2009 (K24) No power

[sylver]

Re: Macbook 13" A1278 2009 (K24) No power

Ok thanks, I won't try before it is replaced then

[sylver]

Re: Macbook 13" A1278 2009 (K24) No power

Ok I got the q7021 replacement chip, I installed it in place of the bad one ...
The green LED is still turning on but the Mac is not turning on from the Magsafe only and It won't charge the battery ... Looks like it's time to check some voltages again ^^

[sylver]

Re: Macbook 13" A1278 2009 (K24) No power

Well I've checked with 2 other working & genuine magsafe psu (60W or more) and they are not turning to green light ... Very strange ...

[sylver]

Re: Macbook 13" A1278 2009 (K24) No power

What is the needed signals/power sources needed to be able to start from magsafe ?
I did check again signals around Q7000/Q7001 and it seems better than at the beginning :
Q7001 : pins 1/2/3 => 11,43V, pin 4 => 10,4V , but pin 5 is still around 0V
Q7000 : pins 1/2/3 => 16,7V, pin 4 => 15,1v but pin 5 is still around 0V

CHGR_DCIN (pin 2 of U7000) is still 0V, I though that it could be because of a dead D7010 (red circle on the attached image), but it appears that pin 1 of D7010 is grounded ... Possibilities are a dead U7000 or a dead C7010 ... But C7010 is not critical so not sure if it could be the problem...

BTW is this possible to check D7010 knowing that pin one is grounded and pin 2 is connected to ground by a 39,41 Kohms equivalent resistor (R7010+R7011) ? I'm afraid that it could be dead as it's pin 1 is grounded and pin 2 is connected to 18,5V from magsafe ...

[HarryPK]

Re: Macbook 13" A1278 2009 (K24) No power

[sylver]

Re: Macbook 13" A1278 2009 (K24) No power

Just one thought : if D7010 was OK, as it's grounded, PP18V5_G3H_CHGR (= voltage on pins 1/2/3 of Q7000) should be 0 instead of 16.7v right ?
Am I right and it means that D7010 is dead, or I'm missing something in my logic and having 16.7v for PP18V5_G3H_CHGR is normal in this case even with an OK D7010 ?

[meritosari]

Re: Macbook 13" A1278 2009 (K24) No power

You're right, on a working motherboard I have 16.55V for CHRG_DCIN !
VDD & VDDC are supposed to be 4V also ...
I measure 96kohms between VDDP & ground on a working board, on the broken board I measure 0 ohm ...

still shorted on those pin?

[dellxps15]

Re: Macbook 13" A1278 2009 (K24) No power

What is the needed signals/power sources needed to be able to start from magsafe ?
I did check again signals around Q7000/Q7001 and it seems better than at the beginning :
Q7001 : pins 1/2/3 => 11,43V, pin 4 => 10,4V , but pin 5 is still around 0V
Q7000 : pins 1/2/3 => 16,7V, pin 4 => 15,1v but pin 5 is still around 0V

CHGR_DCIN (pin 2 of U7000) is still 0V, I though that it could be because of a dead D7010 (red circle on the attached image), but it appears that pin 1 of D7010 is grounded ... Possibilities are a dead U7000 or a dead C7010 ... But C7010 is not critical so not sure if it could be the problem...

BTW is this possible to check D7010 knowing that pin one is grounded and pin 2 is connected to ground by a 39,41 Kohms equivalent resistor (R7010+R7011) ? I'm afraid that it could be dead as it's pin 1 is grounded and pin 2 is connected to 18,5V from magsafe ...

chgr_dcin must be 16volt. q7000 pin 5 must be 5-7volt to open gate and give voltage to pin 5

check if u7000 pin 2 is shorted. if yes remove u7000 and see if pin2 voltage come in.

[sylver]

Re: Macbook 13" A1278 2009 (K24) No power

still shorted on those pin?

I didn't check if it was shorted but it's still 0v, so I guess it is ! I'll check anyway when possible !

chgr_dcin must be 16volt. q7000 pin 5 must be 5-7volt to open gate and give voltage to pin 5

check if u7000 pin 2 is shorted. if yes remove u7000 and see if pin2 voltage come in.

Pin 1 of D7010 which is grounded is connected to pin 2 of U7000, so pin 2 of U7000 is actually grounded also ! Ok I have no choice, I'll remove U7000 ... I'll be my first try to remove this kind of component wish me good luck