hello everyone
this is my first time posting
i want to thank everyone for everything because i found a lot of solutions in here
i have repaired a lot of macbook logic boards and i consider i have some experience but a lot to learn still
this time i couldnt find the solution anywhere so here i am
this a1706 logic board i have was taking 20v and 120mA stucked
i opened it up and did a visual inspection and it was all good except from U7650 which had some corrosion between the ic and C7651 i tested C7651 and shorted
so i removed C7651 and U7650 and replaced with new ones
now i have 20v and 20mA so i started testing that area
I have:
pp5v_s5 - 5V
pp5v_s4 - 0V
pp3v3_s5 - 0V
pp3v3_sus - 0V
p5vs5_en - 3.4V
p3v3s5_en - 3.4v
PPBUS_HS_OTH3V3 - 13v
i know i must have all my s5 in order to have s4 so since i dont have pp3v3_s5 i dont have pp5v_s4
what im not understanding is why if im having power Vin in U7650 also i have p3v3s5_en why im not having the output of pp3v3_s5 ?
any help would be really appreciated
i have osciloscope so i can test anything you suggest
thanks!
this is my first time posting
i want to thank everyone for everything because i found a lot of solutions in here
i have repaired a lot of macbook logic boards and i consider i have some experience but a lot to learn still
this time i couldnt find the solution anywhere so here i am
this a1706 logic board i have was taking 20v and 120mA stucked
i opened it up and did a visual inspection and it was all good except from U7650 which had some corrosion between the ic and C7651 i tested C7651 and shorted
so i removed C7651 and U7650 and replaced with new ones
now i have 20v and 20mA so i started testing that area
I have:
pp5v_s5 - 5V
pp5v_s4 - 0V
pp3v3_s5 - 0V
pp3v3_sus - 0V
p5vs5_en - 3.4V
p3v3s5_en - 3.4v
PPBUS_HS_OTH3V3 - 13v
i know i must have all my s5 in order to have s4 so since i dont have pp3v3_s5 i dont have pp5v_s4
what im not understanding is why if im having power Vin in U7650 also i have p3v3s5_en why im not having the output of pp3v3_s5 ?
any help would be really appreciated
i have osciloscope so i can test anything you suggest
thanks!
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