ASUS UX510U won't Charge after Charging IC Replacement.

[Sephir0th]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

Okay okay, this is really nice. I was not aware of this missing VCC, LOL. Thought it should be ok, since the adapter isn't plugged... Thank you for clarify this!

So the Battery-to-VCC Rail stops exactly at Pin 1 of PD8903, an SCHOTTKY BAT54CW-L. The Battery voltage can not pass. Is this the culprit? :>

Can you explain for me what do you mean with "CLR"? Do you mean the Main Rail or the Charging Circuit? TY!

EDIT: I have in Diode Mode no reading in both directions beetwen BAT & VCC, i guess The Schottky is bad.

[stingerchamp]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

I am out of town and currently do not have laptop to check boardview

If schematic diagram available I can tell

CLR means current limiting resistor where
ACP and ACN

You have to check mosfet at most right side if you are at CLR that MOSFET should allow from right to left
and block from left to right

If it blocks right to left vcc will not get battery and it should off means block left to right when ac adapter plugin so 19v do not reach battery connector

[Sephir0th]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

Because i have No Idea which one is for you the third mosfet (Maybe the Battery one?) I measured more than advised, Just to be Sure.

Battery Only Mode: On Battery-to-Sys Mosfet i have battery Voltage on S, D & G (little difference between Voltage).

Additional i have battery Voltage on both Sides of both Current Resistors (DC-IN & Battery). So everything seems normal yes?

I have Only to Check the Resistor on SDA & SCL Rail. I'll do it soon.

but First Again Back to the Schottky Diode, so you can follow without Board View.

Pin 1 is +BATT, PIN 2 is +DC-IN and Pin 3 is the Output to VCC of BQ24780S. Diode Reading between PIN 2 and PIN3 is nearly 0V (it Acts Like a Wire) but Reading beetween PIN 1 and PIN 3 is O.L. This is the reason why i am Sure, this Schottky is Bad. I believe It has to Switch to +BATT when It's Not getting It's DC-IN Voltage.

Should i measure additional Readings in Diode Mode at the Mosfet?

[stingerchamp]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

Replace and check

[Sephir0th]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

I replaced it and... IT WAS A GREAT SUCCESS!

Now it is Charging fine, even when i unplug the Adapter und Plug it Back and The blink Code is gone.

Thank you for assistance, especially Stingerchamp & piernov! <3

PS: i Challenged an issue with the GPU after. Had Problems with Driver and Not recognized by CPU-Z. The solution was to Put the original BIOS dump Back (i Tried one from BIOS section). The "wrong" BIOS caused a weird jumping VCore Voltage too. Maybe It's a hint for Someone Here. Now everything is fine. <3

PPS: Does anyone Knows a good explanation, why it was Charging after "Cold Boot"?

[stingerchamp]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

Awesome

Can you share picture where you replace diode

[Sephir0th]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

Of course! I've already Assembled the Laptop, but Have taken Pictures before.



Again, Thank you!

[stingerchamp]

Re: ASUS UX510U won't Charge after Charging IC Replacement.

Thanks 👍

[parnz]

Re: ASUS UX510U won't Charge after Charging IC Replacement.



Sorry, afaik No schematic available and i was even not able to Open it with Android boardviewer. There is a repair Guide, but i Would say nothing helpful inside for this Case.

Anyway No need to hurry. This repair already lasts sooo Long. So i'll be Happy If you or Someone Else Take a Look soon.

Greetings

Could you kindly share the repair guide for ASUS UX510U.
I have a no power, no charging Asus UX510U which want to fix and pass it to my son.
Thank you.

[mon2]

Suggest to start a new thread but link to this one for some of the details.

With the meter in DC volts mode, carefully measure the voltage to ground of the charger IC.

Measure the voltage of:

a) REGN
b) VCC

Be sure the meter probes are fine tipped else do not start the voltage checking. They will short the pins and cause other damages.

What is the history of this unit? Just died one day? Using official and original power adapter?