Hi Folks
I'm looking for a extreme high current short killer solution for a reasonable cost.
I have an LGA1700 motherboard (ASUS PRIME Z790-P WiFi) where I exchanged the LGA socket already 3 times, and every time after the socket exchange I get a short of power supply lines VCORE (V variable) and VCCIN_AUX (1.8V).
After taking off the socket, the shorts dissappear again.
The soldermask on the socket is already partially demaged from the heat, so I have reconstructed the soldermask by manually painting the missing soldermask parts with a very small top of a sharpened screwdriver.
The exchange of the socket, except of the two shorts, is OK, what I tested with a memory, DMI and PCIe test cards.
I have already come to terms with the loss of this motherboard, but I would like to discover where the short circuit occurs.
I tried to discover the location of the short using a chinese short killer with 30A max. current i parallel with two swithing power supplys, each 10A current, so the joined current was 50A, but completely nothing happened 😂, not even some temperature rise anywhere.
So I'm looking for some tool or way how to generate a much higher current but with a low voltage (max 6.3V), which could burn through the short.
Starting the board does not help, as the OCP gets activated, and board swithes on, but without both voltages (OCP).
Looked on Aliexpress, but the strongest power supply with a resonable price I found was 70A, which will most probably still be too less, as motherboard VCORE PWM's are designd to withstand much higher amperage, like 250A I've seen on some schematics (max. PWM throughoutput).
I'm thinking on a few solutions:
1. Build a capacitor pack with a capacity of 200000uF (eg. 50 x 4700uF caps in parallel so internal resistance will be very low) or more which I could load with the short killer I have, discharging it could temporarilly generate very high current
2. Building some dedicated regulated swithed power supply with voltage 0-5V and amperage 200-300 A - but I would need a good schematics for it
3. Misusing a PC PSU 12V line, but altering the PSU so that the generated voltage is low (must be below 6,3 V, otherwise the MLCC and electrolytinc capacitor on the board will be demaged)
4. Misusing another motherboard's CPU VRM with a very high amperage, and altering it so, that the volatge/ampearge could be regulated manually from 0 to a few Volts (some adaptation would have to be done)
5. I'm also evaluating to make a X-ray examination of the board somewhere, just made an inquiry in my city, but I'm afraid this will be costly.
If you have any good ideas how to continue with a solution for the issue, or if you know a specific device, or schematic or DIY kit for selfassembling for such a short killer (0-5V, 200-300A), I'd appreciate that very much.
I'm looking for a extreme high current short killer solution for a reasonable cost.
I have an LGA1700 motherboard (ASUS PRIME Z790-P WiFi) where I exchanged the LGA socket already 3 times, and every time after the socket exchange I get a short of power supply lines VCORE (V variable) and VCCIN_AUX (1.8V).
After taking off the socket, the shorts dissappear again.
The soldermask on the socket is already partially demaged from the heat, so I have reconstructed the soldermask by manually painting the missing soldermask parts with a very small top of a sharpened screwdriver.
The exchange of the socket, except of the two shorts, is OK, what I tested with a memory, DMI and PCIe test cards.
I have already come to terms with the loss of this motherboard, but I would like to discover where the short circuit occurs.
I tried to discover the location of the short using a chinese short killer with 30A max. current i parallel with two swithing power supplys, each 10A current, so the joined current was 50A, but completely nothing happened 😂, not even some temperature rise anywhere.
So I'm looking for some tool or way how to generate a much higher current but with a low voltage (max 6.3V), which could burn through the short.
Starting the board does not help, as the OCP gets activated, and board swithes on, but without both voltages (OCP).
Looked on Aliexpress, but the strongest power supply with a resonable price I found was 70A, which will most probably still be too less, as motherboard VCORE PWM's are designd to withstand much higher amperage, like 250A I've seen on some schematics (max. PWM throughoutput).
I'm thinking on a few solutions:
1. Build a capacitor pack with a capacity of 200000uF (eg. 50 x 4700uF caps in parallel so internal resistance will be very low) or more which I could load with the short killer I have, discharging it could temporarilly generate very high current
2. Building some dedicated regulated swithed power supply with voltage 0-5V and amperage 200-300 A - but I would need a good schematics for it
3. Misusing a PC PSU 12V line, but altering the PSU so that the generated voltage is low (must be below 6,3 V, otherwise the MLCC and electrolytinc capacitor on the board will be demaged)
4. Misusing another motherboard's CPU VRM with a very high amperage, and altering it so, that the volatge/ampearge could be regulated manually from 0 to a few Volts (some adaptation would have to be done)
5. I'm also evaluating to make a X-ray examination of the board somewhere, just made an inquiry in my city, but I'm afraid this will be costly.
If you have any good ideas how to continue with a solution for the issue, or if you know a specific device, or schematic or DIY kit for selfassembling for such a short killer (0-5V, 200-300A), I'd appreciate that very much.
