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820-3437 Board SMC_RESET_L at 1.1v
- Thread starter tlough75
- Start date
First remove U5110.
If SMC_RESET_L goes high to 3.3V, then change U5110.
If still low, remove R7100 and check again the signal.
If high, change U7100.
If still low, remove/clean J6100.
As the last option, reflow/change SMC.
Be sure R5100 is Ok.
If SMC_RESET_L goes high to 3.3V, then change U5110.
If still low, remove R7100 and check again the signal.
If high, change U7100.
If still low, remove/clean J6100.
As the last option, reflow/change SMC.
Be sure R5100 is Ok.
tlough75
Member
Ok, So I followed your advice all the way up to... Wouldn't you know it? the Freaking JTAG!!!!! Removed it and BAM! Green/Orange light. Put U5110 back on and BAM!!! FAN SPIN!!!! I swear I looked at the J6100 and it didn't look bad at first glance, on the outside. but inside some of the pins were pinkish-red. Thank you so much! You Rock!
No-Clean
Member
In case someone with the same issue as me comes here, I had the same exact issue, SMC_RESET_L at 1.1V I not only followed the above steps but also replaced each component mentioned, board always did the same thing, it will work fine for 1 day then the next day it will be back to not working and SMC_RESET_L at 1.1V or so, I end up replacing R5100 with a lower resistance one to compensate for the missing voltage and now the board works every time.