PS5 — Short diagnosis behind the southbridge

Repair of a completely dead PS5 by locating a short with voltage injection and replacing a small capacitor behind the southbridge.

In this repair I worked on a PS5 that showed no signs of life. The console did not power on, gave no visible feedback, and behaved as if it were completely dead.

After verifying that the power supply correctly provided 12 V, I connected the motherboard to a bench power supply. The current draw was 0 A, so it became clear that the issue was related to a component on the motherboard.

Initial Diagnosis

After the first checks, I started looking for short circuits on the motherboard. Using the multimeter, I checked several power rails and eventually found an area that was shorted.

Once I identified the suspicious line, in this case the 1.8 V rail, the next step was to understand which component was causing the problem. On a complex board like the PS5 motherboard, many capacitors can be connected to the same rail, or the problem can involve a more important component such as an IC. Knowing that a short exists is not enough: it has to be physically located.

Voltage Injection

To identify the faulty component, I used voltage injection. In practice, I powered the shorted line in a controlled way using a low voltage, so that only the responsible component would heat up without causing further damage to the board.

During the test I injected 4 V and observed which component started heating up. To make it visible, I used ethyl alcohol: when a component heats up, the alcohol evaporates faster at that exact point. This method is very useful when working on very small components. The video shows this phase.

Repair

The component that heated up was a small capacitor located behind the PS5 southbridge.

After removing the faulty capacitor, the short was gone. This confirmed that the problem was localized on that component and not on a more important chip.

When dealing with shorted capacitors, they are often bypass or decoupling capacitors. These components are connected between a power rail and ground to filter noise and make the nearby chips more stable. In some cases, because many of them are connected in parallel, removing the faulty one can clear the short and allow the board to work again.

In this case, however, given the position of the component near the southbridge and not knowing the exact value, I preferred not to leave it removed. I recovered an equivalent component from a donor PS5 board and installed it in place of the faulty one, keeping the original board configuration.

Final Test

After the repair, I checked the main rails again and then tested the console power-on. The PS5 started showing signs of life again, confirming that the short had been preventing the board from booting correctly.

This repair was mainly a diagnostic job: starting from a completely dead console, checking power rails, finding the shorted line, and using voltage injection in a controlled way to identify the faulty capacitor. Microsoldering came only at the end, after confirming with the multimeter which component had to be removed and replaced.

Final Notes

This repair shows how hidden a fault can be on a modern console. A tiny component, such as a capacitor behind the southbridge, can completely block the PS5 from starting.

Together with many other repairs over the years, this work helped me refine skills in diagnostics, short-circuit hunting, voltage injection, and interventions on very small components in delicate motherboard areas.