ASUS UX510U won't Charge after Charging IC Replacement.

[Sephir0th]

Hello @all and i'm Glad to be Here.

I have a Strange issue with the Laptop after Repairing it. The Prepossessor Just Killed the Board by replacing the Keyboard.The Charging IC BQ24780 was shorted on PIN28 and the 10 Ohms Resistor on this Rail was blown too.

I can't explain how unbelieveble hard it was to solder a new IC. I Had issues all the Time to Connect the solder Joints with the IC, Just a mess. And i replaced it 4 Times. I felt Like an Idiot all the Time. And it is actually haunting me in my nightmares. Never Had Problems Like this while replacing a IC.

Howewer, finally i managed it to be Sure, all Pins are soldered properly. The Laptop is working fine, recognize the Charge of the battery but is Not Charging.

There is a Strange battery blink Code, 4x Flashing Green, that is Not described in any manual. And it blinks even If the Battery is disconnected. Maybe this behaviour gives Someone Here a hint.

Yesterday i found a shorted High-Side mosfet with 50 Ohms between Source and Gate. I'm Sure it wasn't shorted at the beginning of my measurements. I replaced it, now have 200k Ohms beetween Source and Gate, but still have identical voltages on Gate und Source (11,58V). I believe this isn't okay. I have 0V on Gate of the low-side mosfet and 200K beetween Source and Gate. Between drain and Source/Gate i have MegaOhms in both Mosfets.

Battery is already replaced. Maybe i'm working too Long on this Board. Any Idea Would be helpful.

Thank you in advance and merry Christmas!

[stingerchamp]

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

Check voltage at battery connector pins
With charge plugin only

[Sephir0th]

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

Check voltage at battery connector pins
With charge plugin only

Without battery I have
12,65V on +,
3,274V on Clock and
3,265V on Data.

[stingerchamp]

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

Check same voltage data and clock at charger ic

Check i-out voltage and with DSO check clock

[Sephir0th]

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

Jo

Check same voltage data and clock at charger ic

Check i-out voltage and with DSO check clock

Voltages of Clock and Data on IC Side are identical.

You mean Input Voltages for Charging Controller? Everything seems fine, 19,14V VCC, 3,026V ACOK, 2,704V ACDET, 6,060V REGN. Actually around 24,8V in ACDRV and 12,4V in BATDRV (without battery).

If you are asking to measure Clock with Oszillator, i have to Tell: No Oszillator available...

No more Diagnose possible without?

And sorry If i didn't Understand all what you wrote. I'm still a beginner and english isn't my native language.

Greetings!

Edit: i have attached the Boardview. Hopefully it will Help a Bit.

[stingerchamp]

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

Can you share schematic

I am outside using mobile phone 📱

Is there any version for mobile ,boardview

[Sephir0th]

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

Can you share schematic

I am outside using mobile phone ��

Is there any version for mobile ,boardview

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

[Sephir0th]

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

Good evening,

i have a datasheet and some measurements for you. I hope something obvious here.


PQ8901 (1st DC-IN MOSFET)
S --> D 3,5 MegaOhms
S --> G 1,1 MegaOhms
D --> G 1,0 MegaOhms

PQ8902 (2nd DC-IN MOSFET)
S --> D 14,0 MegaOhms
S --> G 6,2 MegaOhms
D --> G 3,8 MegaOhms

PQL8901 (LowSide Battery MOSFET)
S --> D 2,6 MegaOhms
S --> G 2,9 MegaOhms
D --> G 213 KiloOhms

PQL8901 (HighSide Battery MOSFET)
S --> D 5,0 MegaOhms
S --> G 2,0 MegaOhms
D --> G 153 KiloOhms

PQL8903 (Battery-to-Sys MOSFET)
S --> D 53 KiloOhms
S --> G 3,5 MegaOhms
D --> G 2,5 MegaOhms

Charger IC - Texas Instruments BQ24780S





Voltages with Adapter only // with Adapter & Battery

Pin 01 - ACN: 19,94V // 19,94V
Pin 02 - ACP: 19,94V // 19,94V
Pin 03 - CMSRC: 19,38V // 19,37V
Pin 04 - ACDRV: 24,94V // 24,88V
Pin 05 - ACOK: 3,027V // 3,026V
Pin 06 - ACDET: 2,705V // 2,705V
Pin 07 - IADP: 129mV // 128mV (194 KiloOhms to GND)
Pin 08 - IDCHG: 11mV // 11mV (191 KiloOhms to GND)
Pin 09 - PMON: 126mV // 126mV (10 KiloOhms to GND)
Pin 10 - PROCHOT: 5,184V // 5,187
Pin 11 - SDA: 3,264V // jumping beetween 3,23 and 3,26V
Pin 12 - SCL: 3,273V // jumping beetween 3,23 and 3,27V
Pin 13 - CMPIN: 2,071V // 2,089V
Pin 14 - CMPOUT: 1,960V // 1,970V
Pin 15 - BATPRES: 0,5mV // 0,4mV (9,9 KiloOhms to GND)
Pin 16 - TB_STAT: 3,373V // 3,373V
Pin 17 - BATSRC: 12,65V // 11,58V
Pin 18 - BATDRV: 12,63V // 11,57V
Pin 19 - SRN: 12,64V // 11,58V
Pin 20 - SRP: 12,64V // 11,58V
Pin 21 - ILIM: 1,172V // 1,171V
Pin 22 - GND: GND // GND
Pin 23 - LODRV: 46,7mV // 0,1mV (209 KiloOhms to GND)
Pin 24 - REGN: 6,057V // 6,062V
Pin 25 - BTST: 17,49V // 11,30V
Pin 26 - HIDRV: 12,84V // 11,58V
Pin 27 - PHASE: 12,66V // 11,58V
Pin 28 - VCC 19,17V // 19,27V

Checked all resistors around the IC and all seems okay except PR8919 with 69 KiloOhms instead of 100 KiloOhms and PR8921 with 80 KiloOhms instead of 180 KiloOhms. No Cap short to ground.

Battery-Connecter

Voltages with Adapter only // with Adapter & Battery

Pin 1-3 - BAT: 12,65V // 11,58V
Pin 4 - DAT CLK: 3,274V // 3,274V
Pin 5 - DAT BAT: 3,265V // 3,265V
Pin 6-8 - GND: GND // GND

Thank You in advance!

EDIT: Doublechecked IDCHG ang got new measurements.

[stingerchamp]

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

Pin 01 - ACN: 19,94V // 19,94V. _ok
Pin 02 - ACP: 19,94V // 19,94V. -ok
Pin 03 - CMSRC: 19,38V // 19,37V. _ok
Pin 04 - ACDRV: 24,94V // 24,88V -ok
Pin 05 - ACOK: 3,027V // 3,026V. -ok

Pin 06 - ACDET: 2,705V // 2,705V. -seems ok check voltage divider


Pin 07 - IADP: 129mV // 128mV (194 KiloOhms to GND). Not ok
Pin 08 - IDCHG: 11mV // 11mV (191 KiloOhms to GND)
Not ok

Pin 09 - PMON: 126mV // 126mV (10 KiloOhms to GND)
Not normal

Pin 10 - PROCHOT: 5,184V // 5,187


Prochat is active on low so ok



Pin 11 - SDA: 3,264V // jumping beetween 3,23 and 3,26V

Data signal need DSO but value ok

Pin 12 - SCL: 3,273V // jumping beetween 3,23 and 3,27V

clock signal need DSO but value ok

Pin13 cMPIN: 2,071V // 2,089V ok
Pin 14 - CMPOUT: 1,960V // 1,970V ok


Pin 15 - BATPRES: 0,5mV // 0,4mV (9,9 KiloOhms to GND)
Problem when battery not plugin it should go high
You plug or not it is same which is an issue

Pin 16 - TB_STAT: 3,373V // 3,373V

Problem
active on low,
high means boost mode is off


Pin 17 - BATSRC: 12,65V // 11,58V
Pin 18 - BATDRV: 12,63V // 11,57V

Batdrv is shorted to batdrv , batdrv should be 6v above batsrc to turn on power via battery

Problem





Pin 19 - SRN: 12,64V // 11,58V
Pin 20 - SRP: 12,64V // 11,58V
Pin 21 - ILIM: 1,172V // 1,171V

Vilm= 20 multiple (vsrp-vsrn)


Check voltage divider resistor resistance

Pin 22 - GND: GND // GND
Pin 23 - LODRV: 46,7mV // 0,1mV (209 KiloOhms to GND)
Pin 24 - REGN: 6,057V // 6,062V ok

Pin 25 - BTST: 17,49V // 11,30V ok

Pin 26 - HIDRV: 12,84V // 11,58V ok

Pin 27 - PHASE: 12,66V // 11,58V need DSO

Pin 28 - VCC 19,17V // 19,27V ok


Check page 19 pin 10 prochat is active on low

You plug or not plug , nchannel mosfet is off means battery is present all the time

It should go down when battery removed

Batpress active on low, it is also not changing

If those high value resistor are connected to charging ic
Replace them and check

Need DSO for frequency check phase pin

[Sephir0th]

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

Check page 19 pin 10 prochat is active on low

You plug or not plug , nchannel mosfet is off means battery is present all the time

It should go down when battery removed

Sorry, but Would you again explain for me what you have found. My thought was, PROCHOT is o.k. as you mentioned before. I Understand it Like protection function for Adapter and battery, If the CPU consumes too much Power. And in this Case PROCHOT Goes Low.
Maybe you can clarify it for me If i Understand it wrong.

Batpress active on low, it is also not changing

I noticed that too. The Charging Circuit seems to believe there is a battery plugged all the Time, even If the Battery is unplugged. Very weird.

I'll Check Pin 17/18/mosfet again and the Resistors too.

Many thanks for your Feedback!

[stingerchamp]

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

First those resistors which you measure have high resistance replace them

Second oscilloscope is mandatory to check clock and data, SDA and scl

Check resistance of SDA resistor and scl resistor pin 11 and pin 12 resistors should be ok till battery connector

Both should be exact 100 ohm resistor

Resistor resistance increase due to which clock and data does not communicate with KBC

To check it we need oscilloscope

Prochat goes high for 10ms to signal battery plugin or removed

10ms small time so again need oscilloscope to check

[piernov]

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

If battery percentage is reported properly, charging circuit SMBUS shouldn't be the problem.

[Sephir0th]

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

Yes, it Shows correct percentage in BIOS, 60% charged at the beginning of the repair attempt and it is fully working from battery too. Actually it is 54% charged.

i have never Tried to load a OS, should i? Maybe It's Worth a try to flash the BIOS due to compatibility issues?

Now It's Family time, so i can't proceed with the repair until evening (5 - 6 hours) and start to replace the Resistors (i believe they are on ILIM Rail)

Greetings!

[stingerchamp]

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

Battery charging percentage will not increase until you get correct date

[Sephir0th]

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

OMG, i didn't know that. Are you Sure? But why? Whence do the Laptop know the difference? I tried to Charge the Laptop for half an hour while in bios.

Anyway i try it this way, Set time and Date and Boot in Windows 10. Maybe we know more after.

[Sephir0th]

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

Holy cow, i just installed Windows 10, The Battery LED now stays Orange and it is Charging! I can't believe and feel one more time Like an Idiot. What a waste Of time...

I Hope you'll forgive me. Thank you Guys!

[stingerchamp]

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

Congratulations 👏

Next time you face same issue

Go to device manager and delete battery manager or battery driver , it will automatically install at next restart

[Sephir0th]

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

OK, unfortunately we cheered to soon...

So YES, it was Charging, BUT it charges Only if i Plug the Adapter First and the Battery after. Immediately after i unplug the Adapter, i get the orange Battery LED blink Code, that is telling me, the Laptop is in Battery-Mode and it has less than 10% battery left. But it blinks even If the Battery is Fully charged. Additionally Windows is saying, the Adapter is plugged, even If i unplug it. (The plugged Symbol disappears for one second in the Moment, i unplug the Adapter)

It's the Same with a replacement battery. I Tried to uninstall the Windows battery Driver with No success. So obviously Something Goes wrong or isn't working on the Board after i unplug the Adapter.

So i need some Further assistance to troubleshoot this new behaviour... and i'll come Back later with new measurements from the Charging Controller in Charging and non-charging condition, If there comes No Idea from the Community before.

Thank you in advance!

[Sephir0th]

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

Good evening,

now i have the time, to do the measurements. But Before, i have to tell something what i've found out and had already done:

I found out, i can reproduce the following to get the Laptop charge:

a) Unplug all, Plug the adapter first (Laptops does autostart) and the Battery after. It charges the battery

b) Let the Battery completely discharge, till i'm not able to power it on one more time. Press the Power Button for 60 seconds. Plug the Adapter after (The Laptop does autostart). It charges the battery.

Additionally i flashed the bios with cleaned ME, just to be sure. But nothing of the behaviour changed.

So here are the values...



So where are the obvious differences?

1. The overall voltage dropped a little bit. Could be normal, because it is charging the battery right now.
2. I have different voltages on the Gates for the charging mosfets
3. The readings from SDA/SCL are much more stable.
4. in my opinion are the readings from IADP, IDCHG, PMON and BTST conspicuous

Any idea? TY in advance! =)

[stingerchamp]

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

You just found the solution

I hope I am right

Vcc should be same as battery voltage when with battery only

All voltages are ok , your charging ic working but

Two points to check

First external
Second internal


External check. ,. In battery mode only voltage is passing from battery to the CLR side from blocking mosfet or third mosfet in DC in line

Because In battery mode vcc of charging ic is battery voltage for functioning of laptop obviously not charging function lol

Vcc is missing

Secondly when no adapter plugin third mosfet if n channel at CLR side should have battery voltage

At SDA and scl battery connector there are 100 ohm resistor attached to these , check there resistance value should be 100ohm fixed , if DSO available you can check signal


First confirm this then we look at low drive drive zero