Macbook a1707 820-00281 Battery no Power

[leonemax81]

C7023 black probe to GND pin 1 and pin 2 high resistance over 1,200 kohm, while if I put black probe on pin 1 and red probe on pin 2 I measure 2.7 ohms.

[leonemax81]

also replaced R6950 without success.

[mon2]

2R7 sounds high. Confirm the resistance across R7021. Then test resistance across R7022. Each should be 1 ohm.

Also confirm again the dual diode @ D6902. Be sure that it is not leaking. Measure in diode mode in each direction with your meter. Respectively, the output voltage to ground of this dual diode @ pin 3 must be stable. Then voltage to ground of PP3V3_G3H @ R6923 must be stable. Check both sides of this resistor @ R6923.

[leonemax81]

resistor R7021 R7022 I confirm they are 1ohm, when the battery plate is connected I have all the voltages in loop, even the PP3V3_G3H voltage, while with the plate not connected, the voltages are ok.

[mon2]

Is the battery with a charge? What is the voltage on the battery? If there is a voltage, can the laptop power up with only the battery? (no power adapter)

Is the battery mosfet Q7065 on or off the board?

[leonemax81]

the battery is 74% charged, the laptop does not turn on with the battery connected, as I have said several times as soon as I connect the black flat cable the Mac does not turn on the USB ports loop up to 5V, the mosfet without the battery has voltage, with battery I have no voltage.

[leonemax81]

also replaced the D6902 diode several times, without success.

[mon2]

Disconnect the battery. Connect the battery flex. Power up with the power adapter.

What is the voltage to ground of:

Q7065, pins 5-6-7-8 = Drain = PPVBAT_G3H_CONN
Q7065, pins 1-2-3 (source)
Q7065, pin 4 (gate)

[leonemax81]

with only the black cable connected to the battery. mosfet:

Q7065 pin 1.2.3.5.6.7.8 voltage 0.998 v
Q7065 pin 4 gate 0.0v

while with black cable disconnected:

Q7065 pin 1.2.3. voltage 12.61 v
Q7065 pin 5.6.7.8 voltage 12.61 then drops 11.45v in loop.
Q7065 pin 4 gate 4.5v then rises 12.61v then drops 4.5v in loop.

[leonemax81]

with black battery flex cable disconnected:

SMBUS_SMC_5_G3_SCL voltage 3.41v then drops 3.23v in loop.
SMBUS_SMC_5_G3_SDA voltage 3.41v then drops 3.23v in loop.

with black battery flex cable connected:

SMBUS_SMC_5_G3_SCL voltage 2.95v then drops 0.900v in loop.
SMBUS_SMC_5_G3_SDA voltage 2.95v then drops 0.900v in loop.

[leonemax81]

replaced Q7065 twice without success.

[leonemax81]

hi friend do you have another suggestion, this board is making me lose my mind, thanks so much for the help.

[leonemax81]

could it be a bad CD3215 chip? when the battery is connected it doesn't work well?.

[mon2]

Confirm the resistance to ground of pin # 1 of the battery flex while it is connected to the logic board. Do not believe it is the CD3215.

[leonemax81]

should I check the SYS_DETECT_L signal with battery flex connected if it goes to low signal?

[mon2]

Yes. We wish to be sure that this line is parked with the pull-down resistor of 10k and not floating. You will still measure the 0v if the line is floating. We need to be sure this line is parked to a logic low.

[leonemax81]

with only the black cable connected 3,700 kohm

[mon2]

What are the details of your power adapter?

macbook a1707 820-00928 - Badcaps
* post # 22

I think you will be ok if using a 100W PD adapter with a certified 100W cable.

[leonemax81]

I use a bench power supply, and the macbook starts with my bench power supply.

[leonemax81]

I have repaired many machines with this power supply, never had any problems of any kind, it is not a power supply.