PS5 Blue Light for 2 Seconds - Low Resistance on 1.3V Rails, Need Help with Diagnosis

PS5 Questions
1

Hi everyone,

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I’m facing a issue with my PS5, and I’m hoping for some advice from the community. When I try to power it on, it shows a blue light for about 2 seconds and then shuts off.

Here’s what I’ve done so far in my troubleshooting:

  1. Measured resistanceon the three 1.3V ram power rails:
  • 35 ohms on one rail
  • 2 ohms on another rail
  • 24 ohms on the third rail
    I’ve read that all the 1.3V rails should have around 40 ohms resistance to ground, so these readings seemed off.
  1. Lifted one leg of the inductors on the 2-ohm and 24-ohm rails to isolate them. The resistance to ground then measured around 40 ohms, indicating that the buck drivers and MOSFETs are likely fine.
  2. Checked the serial log by attaching a serial line to the board, which reported that RAM banks 2 & 4 are faulty.
  3. Injected 1.3V into the three power rails:
  • The rail with 35 ohms could sustain the 1.3V power.
  • The 2-ohm and 24-ohm rails dropped to 0.6V when 1.3V was applied.
  1. Desoldered RAM banks 2 and 4 as the log suggested they were faulty, but the resistance readings on the power rails remained the same (2 ohms and 24 ohms).

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I’m confused about what could be causing the low resistance readings, even after desoldering the suspected faulty RAM banks. It seems like there might be another issue I’m overlooking.

Has anyone encountered something like this before or have any suggestions on what to check next? Could there be another component causing the problem, or is there something else I should test?

Any help or guidance would be greatly appreciated!

Thanks in advance!

2

Hi, did you ever fix this ?

I’ve a similar issue. Power on, blue light for a few seconds then off.

All fuses fine, no short on fuses to gnd. All standby voltages seems to be ok as well.

Have the following resistance readings compared to your board (top to bottom)

15 ohms

2 ohms

95 ohms (which is a bit strange)

About to lift inductors to isolate the rails.

3

I would start with reading the UART error codes.

4

My uart code is

80800022 Severe No/Bad Communication Between APU → RAM - APU Initilized - Replace All/Some RAM (Check APU for Die Cracks)

As the memory power lines are short circuit that sounds correct but finding why proving difficult. Could be a short on one power line bringing the others down ?

Faulty memory chip ?

5

I would check the edge of the die of the APU for cracks.

The low resistance to ground 2 Ohms and 15 Ohms are expected at those lines. 95 Ohms also. The resistance to ground depends on the RAM type (Micron/Hynix/Samsung).

You can check, if voltage show up for a split second when the start button is pressed.