RAZER BLADE 15 2021 MODEL, No power, shorted rails.

[chickenhawk88]

The laptop I am working on is RAZER BLADE 15 , RZ09-0369, the motherboard is DA560 VER 4.0. The original fault was it powered up with keyboard rgb on and no video on screen/hdmi. I found corrosion on memory module that leaked onto the memory socket. I cleaned the memory socket and was able to boot normal with other memory socket with good memory. I really should have stopped at this point as everything was working except for the one bad memory slot.

I wanted to find out what was wrong with the other memory slot. I replaced a 330uf cap, a buck converter on back of board and when i put everything back together to test I plugged in the power adapter and then a loud pop and smoke. There was damage ZSAO 128 A9OR CHIP AND 22976 TI 038 A53L CHIP that I replaced with no help. Then I noticed L9 diode bad but have not replaced cause rails are still shorted to ground ( i did diode mode check - red probe on ground and black probe on cap + )

I took diode measurements and resistance measurement to ground and wrote the values on the attached pictures. The vcore lines are showing short to ground if im reading it right. Is this mean cpu/ gpu / pch dead ? how do I double check ? should i left up the side of inductor facing towards cap to see if one driver chip went bad ? I have worked on other electronics like nintendo switch but have not done much motherboard repair. Looking for some guidance/help here. Thanks in advance.

[reformatt]

The caps above the DRMOS for the CPU are shorted to ground? That will be your main +19V power rail so you need to locate the source of that short.

The coil next to the PCH is also short to ground? That's likely your +1.05V rail so your PCH is probably damaged. I suspect you have had +19V go directly into one of the sub-rails from your description.

[chickenhawk88]

The caps above the DRMOS for the CPU are shorted to ground? That will be your main +19V power rail so you need to locate the source of that short.

The coil next to the PCH is also short to ground? That's likely your +1.05V rail so your PCH is probably damaged. I suspect you have had +19V go directly into one of the sub-rails from your description.

I found a bad dual mosfet by 19v input for 19v rail short. No longer pulling the bench power supply down. The 19v rail is now reading .032v for diode reading. I tried looking around for what diode reading i should be reading on these rails. I really hope the pch/cpu/gpu is ok

The 3.3v rail is reading .004v on diode reading.
I put the bench power on 3.3v rail with 3.1v with 1 amp limit and draws .700amp. There are some small smd that im still figuring what it is and super io chip is getting pretty warm.

[reformatt]

3V @ 700ma is about 2W. That should be hot enough to locate the source of that with just IPA. Given that your coil next to the PCH is short as well, I'd be checking that first with voltage injection and thermal camera or IPA. The EC is usually fed off the LDO voltage from the 3.3V controller chip - if that IC is destroyed, it generally takes down the EC and PCH simultaneously.

[chickenhawk88]

I pulled the super i/o off , 2 chip with marking "VE" , a chip with marking "FA7808 2039CC" and chip with marking "bPCXN" . The 3.3v rail is now at .062v diode reading and the 5v rail is at .161v diode reading.

The PCH never got warm at any point, just the ones I pulled off. The super i/o chip was the last one i pulled off. But I think there are still small part that is shorted though as I check around the area where vin of chip is showing short.