EDM 050 + 80810001 Beep no light

PS5 Slim CFI-2116 – EDM-050

Symptoms:

- Beep No light

- Beeps repeatedly, approximately every 2 seconds

- UART: 80810001 – 2045

The strange part is that the behaviour changes if I slightly move the PCB, for example by lifting it just a little from the heatsink and then placing it back into position.

Depending on the attempt, it may:

- Boot normally with perfectly normal video output

- Give a 2-second BLOD

- Boot, reach a white light, then shut down

- Become completely dead, with no beep and no light

The power/boot sequence always appears normal, and while the console is in standby UART does not report any errors.

What I find particularly strange is the 80810001 behaviour. I would normally expect a short BLOD with this type of power-sequence error, but in this case I can get no LED at all and a very rapid repeating beep approximately every 2 seconds.

The fact that slightly moving the PCB can completely change the symptom also seems significant.

Has anyone seen 80810001 / 2045 behave like this, especially with a repeating beep and no light?

Any suggestions on what area or signals I should investigate?