Acer Predator Helios 300 - will not power up if battery is CONNECTED

[mon2]

This is normal behaviour of the battery mosfet.

Connect the battery and power adapter. Measure the voltage to ground on each pin of the battery connector. We are testing the SMBUS interface voltages.

[survivalbloke]

This is normal behaviour of the battery mosfet.

Connect the battery and power adapter. Measure the voltage to ground on each pin of the battery connector. We are testing the SMBUS interface voltages.

Man, I can't wait to have as much experience as you. battery and charger connected, 12v on the battery terminals.

[mon2]

I think there is more ROI in opening an only fans website.

Does your battery offer more connections or only the power (+) and ground? There should be more contacts on the battery pack. 2 of them = i2c / smbus = SCL / SDA lines. We need to measure these as well.

Post a pic of your battery connector.

[survivalbloke]

I think there is more ROI in opening an only fans website.

Does your battery offer more connections or only the power (+) and ground? There should be more contacts on the battery pack. 2 of them = i2c / smbus = SCL / SDA lines. We need to measure these as well.

Post a pic of your battery connector.

As requested!

[mon2]

So the 3 x RED - hot; black = ground.

We are also interested in the voltage to ground of the other rainbow colored wires in the middle area. 2 of them are for sure the SMBUS / I2C lines of interest. Mate this connector to the board and measure their voltage to ground for each.

[survivalbloke]

So the 3 x RED - hot; black = ground.

We are also interested in the voltage to ground of the other rainbow colored wires in the middle area. 2 of them are for sure the SMBUS / I2C lines of interest. Mate this connector to the board and measure their voltage to ground for each.

It's actually 2x red. Then an orange, but that one looks red in the picture.
Orange=.05v
Yellow=.15v
Green & Blue=3.3v

[mon2]

Go back to PQB4 as suggested by SMDFlea.

Remove all power. Meter in resistance mode.

Measure the resistance across this mosfet:

source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate (4) & drain (5-6-7-8)

Post each measurement. The mosfet can be defective yet pass through the voltage onto the rail through the internal diode.

When you attach both the power adapter & battery - what is the voltage to ground of the gate pins on PQB3 & PQB4. For this case, you should have ~25v on the gate pins.

[survivalbloke]

Go back to PQB4 as suggested by SMDFlea.

Remove all power. Meter in resistance mode.

Measure the resistance across this mosfet:



Post each measurement. The mosfet can be defective yet pass through the voltage onto the rail through the internal diode.

When you attach both the power adapter & battery - what is the voltage to ground of the gate pins on PQB3 & PQB4. For this case, you should have ~25v on the gate pins.

source (1-2-3) & drain (5-6-7-8) = 1.4M
source (1-2-3) & gate (4) = 2.5M
gate (4) & drain (5-6-7-8) = 2.5M

25v to ground on gate of PQB3 and PQB4

[mon2]

Looks ok to me.

Disconnect the battery. Measure the voltage charge on the battery - black probe to black wires; red probe onto the red wire. What is the voltage?

Remove all power. Meter in resistance mode.

1) Measure the resistance to ground on either side of PLB2. We are checking if the low side mosfet is leaking.

2) As before, measure the resistance across the high side mosfet @ PQB5. Someone on this board has a conflict when both the power adapter & the battery are mated so need to study each suspect.

Post the usual:

source / drain
source / gate
gate / drain

resistance values for PQB5. If PLB2 to ground is with a low resistance then PQB6 is a suspect since it is connecting to ground.

Both, PQB5 & PQB6 work together to drill down the Vin from the adapter to create a suitable charge voltage for the battery pack. Assuming the battery pack is not defective, it should charge with a slightly higher voltage than what is printed on the casing of the pack. Respectively, when you power up with the adapter & battery pack, what is the voltage on PLB2 to ground? This is the same charge voltage for the battery pack.