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820-3332 Green light no start
- Thread starter rlowe215
- Start date
SMC_DCIN_VSENSE should be aprox 2.7V...
Q7842 is not the PM_SUS_EN issue I suppose.
Do you always have SMC_BATLOW_L high?
Try changing U7940.
Do you always have SMC_BATLOW_L high?
Try changing U7940.
You can't get PM_SUS_EN when SMC_BATLOW_L is low.
If you got it few times, be sure that SMC_BATLOW_L was high then; and PM_SLP_SUS_L too.
So find why one of these signals is not steady.
If you got it few times, be sure that SMC_BATLOW_L was high then; and PM_SLP_SUS_L too.
So find why one of these signals is not steady.
Must be high with correct charger connected.
If not, should be SMC issue...
If not, should be SMC issue...
Seems I cant figure this out. Fan pulsing and no start. Not charging. Starts in SMC bypass mode but not booting cant see SSD. Is there anything else that can cause SMC_BATLOW_L not getting high?
Try known good 85W charger.
SMC_BATLOW_L is not related with the main battery.
Apple kept BATLOW name from Intel documentation for PCH.
Intel specification relates it with battery level.
"BATLOW# (Mobile Only)
Battery Low: An input from the battery to indicate that there is insufficient power to boot the system. Assertion will prevent wake from S3-S5 state. This signal can also be enabled to cause an SMI# when asserted."
But SMC generates it in base of charger recognition.
No matter battery is present, or not, its value doesn't vary.
Only charger presence, or incorrect power model than expected, will change its level.
Apple kept BATLOW name from Intel documentation for PCH.
Intel specification relates it with battery level.
"BATLOW# (Mobile Only)
Battery Low: An input from the battery to indicate that there is insufficient power to boot the system. Assertion will prevent wake from S3-S5 state. This signal can also be enabled to cause an SMI# when asserted."
But SMC generates it in base of charger recognition.
No matter battery is present, or not, its value doesn't vary.
Only charger presence, or incorrect power model than expected, will change its level.
PSU with 85W cable should be good enough.
But connect it carefully, or turn on the PSU after cable is connected.
Does it still start always on SMC bypass mode?
SMC_ADAPTER_EN is high?
Did you change DCIN board?
Be sure to have the plastic foil around power connector.
But connect it carefully, or turn on the PSU after cable is connected.
Does it still start always on SMC bypass mode?
SMC_ADAPTER_EN is high?
Did you change DCIN board?
Be sure to have the plastic foil around power connector.
Check R5040.
Remove Q5040, just for test...
Remove Q5040, just for test...