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820-3208 missing pp5v_s5
- Thread starter MegaObi
- Start date
"ppbus_g3h 8.24v"
Bad communication between SMC and ISL6259.
Post voltage and resistance to ground on SCL/SDA lines of battery bus.
Do you get SMC_PM_G2_EN?
If not, try to reflow the SMC; better to reball it.
Bad communication between SMC and ISL6259.
Post voltage and resistance to ground on SCL/SDA lines of battery bus.
Do you get SMC_PM_G2_EN?
If not, try to reflow the SMC; better to reball it.
I was thinking you will use diode mode (red probe to ground) for resistance test...
Less than 1% difference allowed there.
You have a bad contact on SCL, or something affects SDA line.
The issue can be SMC, U7000, or battery connector (corrosion).
Remove U7000 first and check if readings are similar; let the board to cool down, before measuring.
If still bad, put good flux and reflow SMC.
If no result, try reballing it.
Change it, as last option.
Be aware of battery connector; clean it as best as possible.
You have a bad contact on SCL, or something affects SDA line.
The issue can be SMC, U7000, or battery connector (corrosion).
Remove U7000 first and check if readings are similar; let the board to cool down, before measuring.
If still bad, put good flux and reflow SMC.
If no result, try reballing it.
Change it, as last option.
Be aware of battery connector; clean it as best as possible.
Check resistance to ground at PPBUS_G3H.
Next check resistance between pins 17/18 and 27/28.
Post some voltages for ISL6259.
Do NOT use UC without real reason!!!
Next check resistance between pins 17/18 and 27/28.
Post some voltages for ISL6259.
Do NOT use UC without real reason!!!
"resistance 27/28 .706v"
R7021/22 open, or bad/corroded trace.
Use ohm mode for low values.
You should get 20 ohms there; aprox 010 in diode mode.
BTW, remove the end "v" from diode mode readings...
R7021/22 open, or bad/corroded trace.
Use ohm mode for low values.
You should get 20 ohms there; aprox 010 in diode mode.
BTW, remove the end "v" from diode mode readings...
The "V" sign can confuse as, thinking about voltage reading (power applied on board), instead of diode mode (no power on the board)