PS5 long pulsing blue light BLOD

PS5 Questions
1

Hi,
this time I have a defective PS5 with long pulsing blue light.

No white light.
No output via HDMI.
No Safe Mode. (Turns off if press and hold “On/Start” after approx. 45 sec)
No shorts or missing voltages (standby/power on) and all fuses ok, so far I checked.
Southbridge gives out over EMC UART “OK 00000000: 3A $$ [MANU] UART CMD READY: 36”, like I would expect from a working southbridge.
No spilled liquid metall.
Under a thermal cam everything lights up like it should (Southbridge, SSD Controller, RAMs, APU, powerstage Mosfets, DC-DC converters)
I tried some washers under the screws at the APU clamp but no changes.

The story, I was told: The PS5 was tested working at the sellers house and after arriving at home the buyer couldn’t get the PS5 started anymore.

Any ideas are welcome. :slight_smile:

2

Any ideas where the 1.8 V lines are coming from/going to?

tp_apubuck_voltage
tp_apubuck_voltage1412×823 223 KB

3

Hi Calvin, which EDM card is it…?

4

It is a edm-010 mainboard. The points seems to be for SoC debug.

5

Hi Calvin,
I found your points; they go directly to the processor. I don’t know if that will help… I can check if the points are going somewhere else afterward if you want.

6

Thank you.

The mainboard was used as a donor and is beyond recovery. :squinting_face_with_tongue:
Maybe I would diagnosed further if I knew the UART error codes and their meaning at the time I had this PS5 on my bench.

I figured out that the testpoints are part of AMD HDT (hardware debug tool):

(In order like on the image)

JL1910(GND); JL1902(SOC_TMS); JL1905(/SOC_TRST)

JL1906(SOC_TCK); JL1903(SOC_TDI); JL1909(/SOC_DBREQ)

JL1907(/SOC_RESET)

JL1911(GND); JL1904(SOC_TDO); JL1908(SOC_PWROK); JL1901(SOC_VDDA 1.8V)