ASUS Rog Strix G17-712LV Laptop Liquid damaged

[XxMicroSoldering]

Hello Guys

I have a ASUS Rog strix laptop that I bought recently to fix and the previous owner spilled water on it . He brought it into a repair shop for them to check it out and instead of fixing it they damaged the battery connector of the laptop ! Other than that they damaged damaged nothing . But since the liquid damage the laptop only turns on and the keyboard lights up and then immediately turns off. I really want to repair this laptop and I also have experience in repairing phones etc and laptops and a bit of soldering but the diagnosing part is where I need help with and how can I find out wich diode / resistor is broken. I did some visual inspection under my microscope and find out this part was corroded ! How to start from here and how to fix it now ? Btw my multimeter is Manuel

all help is appreciated

thank you very much in advance !

[SMDFlea]

What is the motherboard model number

[XxMicroSoldering]

Model number is G532LWS

[SMDFlea]

Model number is G532LWS

The schematic and boardview will help https://www.badcaps.net/forum/troubl...atic-boardview

[XxMicroSoldering]

Thanks for that ! I still don't know how to diagnose this problem and fix it . Do you know how ? And what to start with ?

[reformatt]

Liquid damage can result in a dead CPU or GPU so make sure the power rails for either aren't shorted as it's usually game over at that point. GPU's however can measure under an ohm to ground though and be perfectly normal. What to look out for is shorted FET's/DRMOS in the CPU or GPU power delivery. You have liquid damage around the GPU power controller so that's not a great sign.

The way I deal with liquid damage is to photograph each area first for reference (so I know what components were affected prior to cleaning). Then I use a mixture of de-ionised water and Chemtronics Flux Off with a small toothbrush, clean off with a Kim Wipe. You have to be careful if you don't have a schematic or boardview as this can dislodge a component that's corroded. Assess each components end cap and solder connection and replace as necessary. QFN's liquid damage often results in destruction under the high current connections (like Vin, Vcc etc) so may need to be removed. Any BGA that's had liquid under it needs to be removed and reballed (I just did another Asus ROG laptop with onboard RAM, had to remove 8 RAM IC's and reball to get it working).

Once you have dealt with all liquid affected areas, then you power on, and use the power sequence in the schematic to see what is present, and where it stops.

EDIT: BTW, an ultrasonic cleaner is the last thing you do with such a board. It wipes away all evidence, and in some cases, can introduce faults. I use it only as a last resort these days.

[XxMicroSoldering]

Thank you very much for your reply! Thing is I don't know how to measure with a multimeter and especially with that of mine. Can you maybe explain to me a little bit on how to do this

thanks you

[reformatt]

https://learn.sparkfun.com/tutorials...multimeter/all

Sounds like you might need to spend some time on simple faults (non liquid damaged devices) before you make an attempt to fix this board. Liquid damage is challenging and require a lot of knowledge, even for experienced techs.

[XxMicroSoldering]

Yes but I really want to repair this laptop ! So where to start ?

[reformatt]

Already gave you that info in post #6. Did you miss that?

[XxMicroSoldering]

So what your basically saying is photograph all the parts that were affected by the water and then go replace all the parts wich are corroded with the same value parts ?

[rogfanther]

As he said, photograph then clean the board. The photos are to see if some component doesn´t get dislodged when cleaning.
After that, inspect solder points to see if some are damaged.

From the pictures, you have corrosion on some components that are not so easy for a beginner to replace. Try to clean it well, and test your luck.
But as said, it would be better to start with something easier to get a little more experience before tacking this one.