Replace R6905...
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820-00840 not working from the battery [SOLVED]
- Thread starter Kappy
- Start date
Hi, tried that and no difference. initially after changing R6905 I have 0v on P3V3_G3H.
After connecting the power lead and then removing it with the battery still connected P3V3_G3H dropped to ~1.8v - ~1.7v fluctuating and slowly dropping to now after typing this to ~1.3v - ~1.2v.
After connecting the power lead and then removing it with the battery still connected P3V3_G3H dropped to ~1.8v - ~1.7v fluctuating and slowly dropping to now after typing this to ~1.3v - ~1.2v.
Post C6990 and R6991 voltage on battery only.
Change U7000, looks like doesn't want to enable 3V3_G3H on battery only.
Try another battery, even old.
Check voltage and diode mode to ground on SCL/SDA lines of battery bus.
Looks like SMC communicates with battery and U7000, but check values.
Do you have any voltage at R7075 with battery only?
Check voltage and diode mode to ground on SCL/SDA lines of battery bus.
Looks like SMC communicates with battery and U7000, but check values.
Do you have any voltage at R7075 with battery only?
You don't need power on board to check diode mode to grounbd on signal lines.
And wanted to know the voltage on SCL/SDA lines with charger connected, of course.
U7000 doesn't need to talk with CD3215, nor SMC, to enable 3V3_G3H; valid thing for battery mode only.
In fact, SMC cannot wake up if 3V3_G3H is not generated first.
And wanted to know the voltage on SCL/SDA lines with charger connected, of course.
U7000 doesn't need to talk with CD3215, nor SMC, to enable 3V3_G3H; valid thing for battery mode only.
In fact, SMC cannot wake up if 3V3_G3H is not generated first.
R7075 battery only - 11v
voltage with battery and power lead connected taken at SMC
SCL - 3.4v - same at J6951
SDA - 3.4v - same at J6951
Voltage after taking power lead off with battery connected
SCL - 1.9v - fluctuating
SDA - 1.9v - fluctuating
Diode mode reading
SCL - 0.40
SDA - 0.40
voltage with battery and power lead connected taken at SMC
SCL - 3.4v - same at J6951
SDA - 3.4v - same at J6951
Voltage after taking power lead off with battery connected
SCL - 1.9v - fluctuating
SDA - 1.9v - fluctuating
Diode mode reading
SCL - 0.40
SDA - 0.40
"R7075 battery only - 11v "
Post voltage with charger only and also charger plus battery...
Post voltage with charger only and also charger plus battery...
I don't know where you measure.
R7075 must have 5V on both sides...
Your values points to bad U7000.
Which is the exact PPBUS_G3H voltage with charger only?
R7075 must have 5V on both sides...
Your values points to bad U7000.
Which is the exact PPBUS_G3H voltage with charger only?
OK, time to make a test.
Remove R6991 and inject 5V (externally) at its pad 1; going to U6990.
Check if then board works on battery alone.
Remove R6991 and inject 5V (externally) at its pad 1; going to U6990.
Check if then board works on battery alone.
So, for some reason U7000 doesn't want to enable 3V3_G3H power supply on battery only.
Be sure Q7040/65 are good.
Compare voltages around U7000 in battery mode with a good board.
Also compare diode mode readings.
Be sure Q7040/65 are good.
Compare voltages around U7000 in battery mode with a good board.
Also compare diode mode readings.