[SOLVED]a1278 820-2936-a green light always on not orange

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John Tba

New member
Hi Louis Hi everybody,nice job here.Congratulations.My name is John and i am chip level engineer in Greece.I am working 5 years mostly on laptop repairs and less on mobiles.
Lately we have some apple machines for repair and i am troubleshooting on some a1278 i got with the same problem.Laptop power on but not charging.Green light only is on.Orange never appear.
I have replaced charger ic measured all resistor arround and voltages there are fine.SMBUS_SMC_BSA_SDA and SCL pulses exists U6900 U6901 voltages there are fine.I believe that this is maybe SMC problem
but how possible can this be?all other functions of smc be ok except data with battery and charger.i appreaciate any help can be givven.
Regards
John
 

John Tba

New member
hi.
Battery indicator lights respond with correct battery capacity.In osx is also recognized with correct capacity and drain normally.
 

dukefawks

Administrator
First thing put the original BIOS back!
Measure resistance between the pins of ISL6259 between 17/18 and 27/28.
 

John Tba

New member
hi sir thank you for your fast reply.It is very important for me. resistance between 17and 18pins is 1.07kohm and 27-28 is 21.3ohm . bios programmed to original
 
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