ASUS X550CL - Works only with battery ?

[mon2]

Re: ASUS X550CL - Works only with battery ?

1) ~19v is good for the mosfet voltage.

2) what is the voltage on pin #4 of these mosfets?

3) the resistance of the mosfets at OL means the resistance is higher than the scale on the meter on the scale. Switch to the next higher scale and confirm the resistance again. NO power while checking resistance. The mosfets appear to be ok.

4) the charger IC pu8802 also drives the 2 local mosfets that charge the battery. Locate those mosfets. Measure the voltage on pin #4 (gate) of the 2 x battery charge mosfets.

What is the voltage of pin #4 of each battery charge mosfet if the battery is REMOVED?

What is voltage on pin #4 if battery is ATTACHED?

5) Is the battery known to be good?

6) measure the voltage on each pin of the battery connector WITH the ac adapter connected.

7) when BOTH, ac adapter and battery are connected, does Windows show that the battery is charging? Do you see the battery charge graphic? You should see this. Then when the AC adapter is removed, the charging graphic should change to only the battery symbol. Confirm this.

8) next, trace the battery charger IC to locate yet another mosfet...the Battery mosfet. Remove all power and the battery. Check the resistance of this battery mosfet like the others.

9) finally, check the resistance of the 2 x battery charge mosfets with again, no power. Use 200k or higher scale. We need to confirm that none of these mosfets are defective.

[Acnologia]

Re: ASUS X550CL - Works only with battery ?

1) ~19v is good for the mosfet voltage.

2) what is the voltage on pin #4 of these mosfets?

3) the resistance of the mosfets at OL means the resistance is higher than the scale on the meter on the scale. Switch to the next higher scale and confirm the resistance again. NO power while checking resistance. The mosfets appear to be ok.

4) the charger IC pu8802 also drives the 2 local mosfets that charge the battery. Locate those mosfets. Measure the voltage on pin #4 (gate) of the 2 x battery charge mosfets.

What is the voltage of pin #4 of each battery charge mosfet if the battery is REMOVED?

What is voltage on pin #4 if battery is ATTACHED?

5) Is the battery known to be good?

6) measure the voltage on each pin of the battery connector WITH the ac adapter connected.

7) when BOTH, ac adapter and battery are connected, does Windows show that the battery is charging? Do you see the battery charge graphic? You should see this. Then when the AC adapter is removed, the charging graphic should change to only the battery symbol. Confirm this.

8) next, trace the battery charger IC to locate yet another mosfet...the Battery mosfet. Remove all power and the battery. Check the resistance of this battery mosfet like the others.

9) finally, check the resistance of the 2 x battery charge mosfets with again, no power. Use 200k or higher scale. We need to confirm that none of these mosfets are defective.

Wow. Thanks for the heads up.
Yes, the battery is known to be good, and yes before it was charging just fine. That's why i managed to see that the laptop was working with battery.
But now it doesn't charge it.

Yes, the graphic changes , yes it shows it's" charging " even the symbol ,but it is stuck at 71.2% ,also the battery led light on the palmrest shows orange , and blinks , on - off , on -off but it doesn't charge

#4 you mean of the PU8802 ?

Also you mean to check the PQ8803 , mosfet ? GATE/SOURCE/DRAIN ?

[mon2]

Re: ASUS X550CL - Works only with battery ?

but it is stuck at 71.2%

This value does not go down with normal use of the battery and also does not increase while the ac adapter is supposed to be charging ?

If you see the charging graphic then the charger IC is being instructed to perform this task - that is a good sign.

If you remove the ac adapter, the charging symbol changes to normal battery graphic ? That is expected and again a good sign. Confirm this.

We can check the mosfets after the SMBUS interface review...

Review immediately the voltage on pins # 8 & 9 of the charger IC PU8802.

You can measure at the points showing in the attachment. It is important that the charger IC be properly soldered so the connection is being made to this charger IC.

Next, remove all power & no battery. Meter in resistance mode.

Check the resistance between (SCL) J6003 (pin # 5) & PSL8803 (pin # 1) - this should be ~330 ohms. Confirm it.

Repeat with (SDA) J6003 (pin # 4) & PSL8802 (pin # 1) - should be ~330 ohms. Confirm it.

Is PD6001 soldered on your logic board ? This should be a 6 leg SMD ESD diode array component.

Confirm the voltages on pins J6003, pin # 4 & 5.