PS5 3A Auto-Trigger Loop on 12V Insertion Post-Southbridge Swap

[gentleginger]

Hello everyone,

I’m working on a PS5 EDM-010 board and hit a roadblock. Looking for some expert advice on what to check next.

1. Initial Fault & Repair History

• The Root Cause: The console originally had liquid metal leakage escaping from the APU area.

• 
  

  Initial Symptoms: On the very first test before repair, pressing the power button gave a brief blue light, then the console immediately shut down. After that single event, the board went completely dead—no beep, no blue light, and absolutely no response.

• Diagnosis: Upon inspection, I found multiple shorted capacitors near the 12V area, and the 3.3V standby rail was completely missing.

• Action taken: Suspecting the dead Southbridge was pulling down the 3.3V rail due to the liquid metal short, I replaced it with a brand new, pre-balled Southbridge chip.

  
  

2. Current Symptom (Current Draw Sequence)

Now, the 3.3V standby rail has recovered, but when plugging in the 12V main power supply, the DC power supply shows the following exact loop:

1. 0m to300m

2. Drops down to a stable 24mA

3. Suddenly spikes to 2.6Aor3A auto-triggering. APU area heat up and cool down and desappear.

   

4. Instantly drops back to 24mA and latches there (Over-current protection kicking in).

[jkyoho]

if you dont have a short on the power_btn line, the southbridge you replaced might have issue, redo or replace it again accordingly.

I measured about 10k ohm resistance and 0.800 V diode reading on a working southbridge power_btn line(top side of 120 ohm resistor) next to power button flex

[gentleginger]

Yeah that resistor near power button is shorted. I found it leads to a pad under southbridge so I have to reball it or replace another one. Thanks man!

[jkyoho]

@gentleginger

Yeah that resistor near power button is shorted

the resistor is 120 ohm by default, should not consider to be a short by all mean.