Re: Dead ASUS ROG G14 (GA401)
This is a classical behaviour of a shorted DC-IN Mosfet, between Source and Drain, for example
This is a classical behaviour of a shorted DC-IN Mosfet, between Source and Drain, for example
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Re: Dead ASUS ROG G14 (GA401)
My bad, yes pins #4 & 5 which appear to be ok for the diode mode readings.
Let us check that the contacts reach the charger IC.
Meter in diode mode. Short the meter probes and you should have a tone beep.
One meter probe on pin #4 of the battery connector (without the battery connected); other meter probe to pin #12 on the charger IC.
Do you hear a tone beep?
Repeat with pin #5 of the battery connector & pin # 11 on the charger IC.
After the above tests, power up - still without the battery.
Meter in DC volts mode. Measure the voltage to ground on pins #4 & #5 on the battery connector.
You should have ~3v on each SMBUS SCL / SDA pin.
Finally, connect the battery again and check if the voltage to ground measurements remain at ~3v on these battery contacts.
A defective BMS board on the battery pack can cause the SMBUS communication to fail. At that point, the battery should be replaced.
Post each measurement.Attached FilesComment
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Re: Dead ASUS ROG G14 (GA401)
This is in diode mode?
Place meter now in dc volts mode.
What is the voltage to ground with the battery and adapter connected for these smbus pins (SCL and SDA)?Comment
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Re: Dead ASUS ROG G14 (GA401)
Remove the battery. Using only the power adapter, what are the voltage readings to ground of these 2 pins?Comment
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Re: Dead ASUS ROG G14 (GA401)
These are open drain pins so they must have local pull up resistors to park these pins to a soft logic high level.
Either these pins are missing these pull ups or the ESD diodes are pulling these pins low.
Locate the ESD diodes on these pins on the logic board. They should be fluxed and carefully removed. Do not lose the parts.
Then power up again and check these pins.
See attached for their component names.Attached FilesLast edited by mon2; 05-21-2023, 03:12 PM.Comment
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Re: Dead ASUS ROG G14 (GA401)
See attached. Locate these local pull-ups for this SMBUS pair of lines.
Confirm the voltage on each side of the pull-up resistors.
R3001
R3015Attached FilesComment
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Re: Dead ASUS ROG G14 (GA401)
This is not how you test a Mosfet for internal short between all three logics. But 25V at Gate points to there is possibly something else going on.Comment
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Hello i need help to fix this laptop,at least a discrete to UMA conversion if it's possible.
i took a photo of what i found,NVIDIA gpu side is 100% shorted as i desoldered power line coils and mosfet side is ok.
Even without coils laptop still not power on.Main power rails,bios,1v,3,3v and 5v are present... -
Hello.
Have this Asus UX433FAC that came with shorted mosfet on main power rail. After replace laptop works ok, but battery is dead. Laptop show charging but voltage on battery is 0.2V. when remove battery voltage on battery connector goes to 8.5V, but when connect battery again it goes down to 0.2V.
can that short shorted battery? batmon show that battery is full at 80% -
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(Had 3 problems, now just 1)
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I used boardviews of mostly FX505GD-M, and some FX505DU, FX505DD. Used schematics of FX505DU.
I had originally intended to replace the BQ24780s first (due to previous battery removal while benchmarking) but I... -
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Hi guys!
I searched for the term "dead short" in the forum but no specific thread came up however if I'm just blind and couldn't see the thread talking about this please forward me to that direction.
So my problem is I don't know how to find the source of a dead shorted voltage rail. Dead short = ~0 ohm resistance.
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