Well I am dumb to buy a faulty water damaged motherboard from ebay and i need help :)

[Satvik Hardat]

yesterday i bought this

I was not high on caffeine but the specs we nice-

• Processor: AMD Ryzen 5 4600H 6 x 3 - 4 GHz, Renoir-H (Zen 2)
• Graphics adapter: AMD Radeon RX Vega 6 (Ryzen 4000/5000)
• Ram: 16gb DDR4

so i bought it now i need schematics and help trouble shooting this all i saw is this burned cap idk what the value is, HELP

[Satvik Hardat]

It was 22.5$

[mon2]

Start with using IPA (alcohol) with cotton swap to clean up all the areas with the white puss / puke / corrosion on the PCB. Also clean up this area which appears to have a burnt capacitor. Then post a clear but close up picture of the logic board.

[Satvik Hardat]

Ok I'll do that 🙂

[dellxps15]

i never buy mainboard only unless i have all other component to fully test the board. as suggested clean with ipa, and check if that cap is shorted. if so remove it and measure again.

[rddube]

Wait, before you clean it do post nice clear and crisp photos (sorry to say, but your photos are blurry) so that we can help you identify the areas to fix. From the blurry photos you posted, I spotted a few spots that look suspicious. see attached. Only after having identified all areas both sides that might have been affected will you have any hope of getting this thing back to life. After having identified all areas (which we can help you with with some decent photos) then do what Mon2 suggests.

[Satvik Hardat]

ok lemme tell something else i did

[Satvik Hardat]

See the thing is when I received the motherboard it was somehow showing light. And I was really happy but then I saw the capacitor smoking and after few second. the motherboard turn off and I remove it that capacitor. but after that the motherboard never showed any light And then at my try at replacing that capacitor. I removed another one. then again Is started showing light? I don't know how then the third and the last capacitor on that the decoupling rail in that VRM started smoking but i removed the power asap so now it should show light but start the capacitor to smoke again idk why pls help, sharing pics in 5 min

[Satvik Hardat]

photos-

[Satvik Hardat]

Pls help as soon as possible

[dellxps15]

all the latest pictures are after board got cleaned ? clean with ipa and if necessary apply flux and hot air, but u should spot if some component is still ok or need to be removed/replaced by measuring if it's shorted or not.

green spot just clean and check if shorted, while red spot clean and maybe rremove component to see if it's corroded also under it. more important on ic the mosfet.
before all always check for shorted marked component before take any action. if a capacitor looks bad but no short u can leave it that way. if an ic is corroded, u should check datasheet and see what each pin is for.

[Satvik Hardat]

I checked with multimeter now and all the three caps are bad or shorted with no resistance across them so I removed all 3 so should I power it on or not now.(Now I saw no short using multimeter) And one more thing the cpu vrm caps have a minimal 6 ohms resistance across are they fine because the reading comes after some time I think because they are large electrolytic caps

[Satvik Hardat]

Some how it works nowwwww. ))))), i see no smoke or shorts 5v, 3.3v, 1.8v are there but unable to fine voltages on cpu vrms maybe i needa short the power button connector but ain't able to find any teardown for this specific model

[dellxps15]

many laptop after removing power will cycle 2-3 times before giving picture. did u clean well the 2 corroded ic marked red in my picture ? good work till now.

6 omh on cpu are fine.

[Satvik Hardat]

uhm one more thing is it fine for 5v rail sit at 5.8v and 3.3v at 3.6v?

[Satvik Hardat]

before startup or shorting the power button pins (and i dont know the reading after powering on cuz i am still looking for the power button jumper near ec chip)

[Satvik Hardat]

Now even higher 5v at 6.12 and 3.3v at 4.02v

[dellxps15]

check multimeter battery... looks like it's bad reading

[Satvik Hardat]

Hmm ok it has also started showing low battery sign.

[Satvik Hardat]

Now this is last i promise you see that connector one of its pins are the power_btn that goes to ec chip and idk what should i short to ground