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820-2936b no power no green light
- Thread starter tipoti
- Start date
Exact PPBUS_G3H voltage?
Test with board alone on the desk, w/o battery.
Test with board alone on the desk, w/o battery.
Your board doesn't turn on; there is no reason to check mentioned resistors voltage.
SMC_RESET_L goes high?
SMC_RESET_L goes high?
R7000 1th & 2th legs, 3,3 volts.
Post voltage and diode mode to ground on SCL/SDA lines of battery connector.
Don't forget to remove power when you check in diode mode!
BTW, do NOT quote an entire post, visible few centimeters above.
I don't see any reason to do that...
Don't forget to remove power when you check in diode mode!
BTW, do NOT quote an entire post, visible few centimeters above.
I don't see any reason to do that...
Why do you check diode mode on SCL/SDA with black probe to ground???
Post voltage and diode mode to ground on SCL/SDA lines of battery connector.
Don't forget to remove power when you check in diode mode!
I did as you asked. How else could I check it? Where was the black probe supposed to be? Could you elaborate specifically? Use exact instructions, please. Where exactly should I check with which probe? On which leg?
Don't forget to remove power when you check in diode mode!
I did as you asked. How else could I check it? Where was the black probe supposed to be? Could you elaborate specifically? Use exact instructions, please. Where exactly should I check with which probe? On which leg?
"How else could I check it?"
Read here...
boards.rossmanngroup.com
Read here...
HOW TO collection
I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...
boards.rossmanngroup.com
You've posted BEFORE SCL/SDA with BLACK probe to ground; OL and 2.176 respectively.
Now (in correct way) you get big diference between readings, 0.514/0.620.
Remove D6950 and check again.
Now (in correct way) you get big diference between readings, 0.514/0.620.
Remove D6950 and check again.
Something else still bad there.
Remove C6952/53 and check again.
If still bad, then measure removing U7000.
SMC is the last to check.
Please, STOP to load such pictures; better to write the values.
Remove C6952/53 and check again.
If still bad, then measure removing U7000.
SMC is the last to check.
Please, STOP to load such pictures; better to write the values.
Did you check if R7000 is good (0 ohm)?
CHGR_RST_L must be high, as SMC_RESET_L.
CHGR_RST_L must be high, as SMC_RESET_L.
