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820-2915 - not detecting battery

T

techrepair

Member
Hi guys ,
need help on this board . it is running fine on the charger but does not detect battery , i have checked the resisitor r5281 and r5280 , the both are showing 2.0k
there is no short to gnd on SMBUS_SMC_BSA_SCL and SMBUS_SMC_BSA_SDA. i have already changed the isl but no change . the strange thing which i have noticed is
the q7030 getting extremely hot . i replaced that aswell but no luck .
( it has a cross on battery icon hence not detecting the battery )
plz advise thanks
 
Last edited:
A

aprendiz

Moderator
Try with another known good battery.... If remove battery, Q7030 still getting hot???? What voltage do you have on SMBUS lines??
 
T

techrepair

Member
hi ,
thanks for the reply , Q7030 is getting hot without the battery . i will check the voltages and update thanks
 
Last edited:
D

dukefawks

Administrator
Q7030 getting hot can only really be caused by a dead 6259, bad q7030 or 7035 or the traces to the gates of them. Battery detection will probably be 6259 or SMC.
If you remove the 6259 it should still work on the battery if it is recognized.
 
T

techrepair

Member
thanks for the response ,
q7030 kept on getting hot , this time rather than replacing q7030 first i replaced the isl and then replaced the q7030 , now it is not getting hot but now on battery plugged in i was getting very low output from d6990) and after replacing d6990 i have 3.42 volts but the board does not start ( battery not recognized) . As there is no short on smc data lines i think smc itself is faulty but finding a working smc from another board and replacing it is a torture .
 
T

techrepair

Member
hi,
that board went away but i am replacing the smc on 820-2838-a, i have removed it successfully but now i am unsure that either an smc taken from 820-2327 will work on 820-2838-a i or will not work ?
logically the new smc's can be programmed differently so no idea. Also i need to replace smc on a1466 but do no have the same board as donor . so kindly advise as which smc's are compatible . thanks
 
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