Asus Laptop New Fault - What is causing it ? 

up

Great eyes

Up

Saw it too

Not most. 100% of the time they are and to the super io (ec)

I second this and I think it enables the regulator chip that supplies the 5v and 3v lines as well.

@@pyotrilyichtchaikovskyii6638 the 5v and 3v are on a different rail. The charging ic controls 1 & 2nd mosfets plus the 1st and 2nd mosfets on the battery line. Super io checks the talks to charging ic to ensure all voltage, data etc is present and ok.

Once the satisfactory voltages have been met on the charging ic circuit and power good signal has been given then the 5v and 3.3 always on signal will be created via a series of buck regulators/switches that turn on and off and depending on off on off on off on off and depending on how quick they turn on and off will determine the Vout

I took a look at that as you said and it does look like a crack (well spotted)👍

Doesn't seem cracked, seems like an hair or lint, not a crack.

On video most of the cracks are a visual effect but this one indeed looks cracked. Great find!

Eagle eye

Seems like it. Nice spotted. I hope he checks it out.

That's what I was going to ask.

I saw this as well but the metal cap and smd cap are on the same rail.

Sounds reasonable.

I don't think so, often, these notebooks take power to the bios from the main battery if it's not removable.

Happen to me with an HP workstation .,... NO VIDEO, from one day no another. The IT guy was about to trash it. Took out the battery, discharged the motherboard and it workend after powering on. This trick came from OLD IBMs that suffer a lot from low CMOs battery. It shocked me that a modern HP workstation was still suceptible to this.

Without 19v main power rail how can you get 3.3volts

Agree with that

EC needs a standby voltage which is 3.3vdc and this is also true on a charging chip. The question is where is this 3.3vdc should come from? Those 19vdc before the MOSFET will likely have another path going through a dc/dc voltage regulator that will output another 3.3vdc and 5vdc those regulator and i we call that output as VDO, the VDO will only output if it receive a signal from EC to turn on. What other technician didn't realize is that the same regulator will output another 3.3vdc & 5vdc and it will be called VDA . These VDA will output the moment the regulator receive a 19vdc from the charger. So, any short from these VDA will not supply the standby voltage of an EC. I know this because i already troubleshoot a shorted VDA and its from Acer i7 laptop

I agree also, I already fix a lenovo laptop that has charging ic problem.

i was going to write this.. totally agree..

Bios corruption bios will cause that too, bios talk to the EC also.

You're right

bq24780s

i found that in hard way.. Working on Huawei nova 2i mother board ❤

I don't know if he just got too acustom to the same faults he don't want to check for these things or he just don't want to teach us how to do it, check the power sources and if the super io is working

You're right bro...Sharp Eyes 👀

@@eftekerahmed7299 Thank you, it comes with the profession!😁

Probably the right spot, well done ! Why the hell do they put metal paste instead of a non conductive ??

@@gattaca9287 Because its way more efficient! In a small laptop shell the high end components will produce lots of heat! Even 5 degrees improvement in the temperature of the main compute components may be critical for the better user experience! But it's also dangerous! Big companies like Asus could easily remove any possible short from spilling the liquid metal in that area by just covering the exposed caps near the cpu and gpu with silicone or other isolating material which will cost them penny's!

Good job mate! I didn't see that at all, before reading your comment! It could be the reason for the strange problem of that board! You may be the savior of this board! Alex is awesome! I hope he successfully return that board back to life!

AFAIK if the 19V is missing, you can't have 3.3V because it is generated from the 19V. You need to have a working 19V rail in order to have 3.3V, 5V and so, but I might be mistaken.

First +vin (19v) should be ok then only +3.3v will be generated

@@amberonline24 No! 3.3v and 5v are usefull for SIO. Seraj is right. To be sure, you can mesure 3.3v on pson on keyboard or on button. If not 3.3v then maybe the charge chip or one step down 3.3v is the issue.

19v is the main voltage.. you check 3v and 5v when you have 19v..

@@labibleatarilesitedesatari6724 In each and every laptop first +19v power rail is there then +3.3v low drop out supply activates which goes to SIO in order to be able to get +3.3v always (coil) supply and +5v always... +5v does not go to SIO. Correct me if I am wrong. So first voltage is 19v Vin to check on current sense resistor. 🙂

I currently have a Lenovo Legion 5 that is presenting in pretty much the same manner as his. But the MOSFET he removed, on my board I removed it and it is short. Measured board where MOSFET was, no shorts and getting 20V on second source, where I was getting 0V before. currently trying to find a substitute for the particular MOSFET that the manufacturer put on the board to begin with. trying to decide if I try that jumper from D-D like he did would be a good test. I'm a little apprehensive about it, though I am curious if the board will either turn on, or reveal the charging chip being shorted. On my board it is a BQ24780S I think.

I had the similar problem with the 4-6v on the main power rail, the problem was in the first MOSFET. It had source shorted to the gate.

First thing I thought of was a crack in the chip. I even paused and went back. Looks like a crack to me.

Was going to comment on the blob but it seems both pads are on the same plane so maybe it doesn’t really matter?

Looks like a solder blob, but even if it is a blob, I think that capacitor it is connected to that component. But it may be worth to be looked at.

You are right that the charging ic is the main issue

I don't think is missing, I think it is default factory.

Good eye! I missed that crack first time watching.

hp, dell, and lenovo mobile workstations (zbook, precision, thinkpad). everything else is hit or miss, even with those companies. And for sure stay away from all Apple products. If their laptops don't die their software updates will bork it somehow so you'd have to buy a new one.

What of a board that has just been programmed and no Bios have been set yet?

That was my first thought

I was about to comment on that but I think they are on the same plane so they are connected together already, I think :-)

What a nice insight. You are correct

Must be from UV rays residue 🤭