Hello all !
I try to find a solution for these problems:
Magsafe connected (green light ok)--->board boot--->shutdown--->boot and finally acces to OSX--->no battery detected and no batterry indicator lights.(no water damage).
I have 820-2915 K91X_MLB BRD file and soft+k91f_820-2915_revb PDF..
I have try to understand few video that addresses this problem, but can't understand everything... I'm french and I hope that you can guide me in this exploration.
I have check around U7000 chip for Resistance/smd ceramic page 63 of 101(page Pbus Supply & Battery charger) I just have exchange 2 resistances(R7021 & R7022 because not 10Ω was present after desoldering..)
I have desoldering U7000 (ISL6259) check few tracks finally resoldering this chip.I did not find anything wrong.about that. (tell me if I'm wrong).
I have somes questions for differents mesures:
Why in place C7056/C7057/C7050 have 2.55mFarads on tester while components are ok?The same for C7011--->0.000536µF in place and desoldering 0.049µF so I decide to change it for 0.02µF(normaly 0.01µF ±10%, in pdf). /C7000 2.7µF in place and 1,2µFdesold..
I observed a decrease in voltage in pins 7,8,9 of battery connector(J6950)--->3.42V to 0V...??
So I have R7039 and C7039 are missing on my board, and present on the board view (it's not grave if I don't have the good revision of board view or pdf?)
I'm happy to post here.
Thanks in advance for your help.
See you soon.
Lucas
France.
I try to find a solution for these problems:
Magsafe connected (green light ok)--->board boot--->shutdown--->boot and finally acces to OSX--->no battery detected and no batterry indicator lights.(no water damage).
I have 820-2915 K91X_MLB BRD file and soft+k91f_820-2915_revb PDF..
I have try to understand few video that addresses this problem, but can't understand everything... I'm french and I hope that you can guide me in this exploration.
I have check around U7000 chip for Resistance/smd ceramic page 63 of 101(page Pbus Supply & Battery charger) I just have exchange 2 resistances(R7021 & R7022 because not 10Ω was present after desoldering..)
I have desoldering U7000 (ISL6259) check few tracks finally resoldering this chip.I did not find anything wrong.about that. (tell me if I'm wrong).
I have somes questions for differents mesures:
Why in place C7056/C7057/C7050 have 2.55mFarads on tester while components are ok?The same for C7011--->0.000536µF in place and desoldering 0.049µF so I decide to change it for 0.02µF(normaly 0.01µF ±10%, in pdf). /C7000 2.7µF in place and 1,2µFdesold..
I observed a decrease in voltage in pins 7,8,9 of battery connector(J6950)--->3.42V to 0V...??
So I have R7039 and C7039 are missing on my board, and present on the board view (it's not grave if I don't have the good revision of board view or pdf?)
I'm happy to post here.
Thanks in advance for your help.
See you soon.
Lucas
France.
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