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.
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.
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