Hardware PS5 FAT / CFI-1216A / EDM-033 / 80801110 Severe RAM GDDR6 (Bank 5) persists after chip replacement and swap

akoznov

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Hello there đź‘‹
Got a console in with BLOD. Symptoms:
  • Fan spins up
  • Blue light for ~2 seconds, then power off
  • Currently the only error in UART:
    Code:
    [*] Operation: Run Read Error Codes[Slot #]    [Date Time]        [Error Code]    [Priority]        [Error Message]
    00    8/31/2026 4:48:03 PM    80801110    Severe        RAM GDDR6 (Bank 5) - Single Beep, 1 second blue light, off.
         |-(OK 00000000 80801110 00000022 FFFF0005 10000100 2013 0036 2380 1AE0:F3)
        Click for TSB Information
    
    01    10/7/2162 11:15:44 PM    FFFFFFFF    Low        No Errors
         |-(OK 00000000 FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFF FFFF FFFF FFFF:5A)
        Click for TSB Information
    
    End of errors.
    Low: Nothing to concern about first.
    Medium: Everything appears fine.
    High: Console may boot but freeze or other issues.
    Severe: Prevents console from booting.
    Ignore Priority Status For Now. They are being updated!
    [*] End Operation: Read Error Codes
What I've already done:
  • Replaced RAM chip #5 with a new one - same error
  • Diode mode check with threshold 1.5v on the RAM pads to rule out a broken connection of lifted APU pads— all values fine
    1788189495505.png
  • Swapped chips #5 and #6 — error still reports Bank 5, not Bank 6
    1788189355702.png

That last point is what puzzles me: if the fault followed the chip, I'd expect the error to move to Bank 6. Since it stays on Bank 5, I'm leaning towards something on the board side or the APU itself rather than the memory IC. Maybe something else that I can check related to the bank 5 components around on the back of the board and some components are failed there?

Bank #5 pad area was adjusted with solder mask to exclude any potential balls soldering together and looks like this:
1788189603846.jpeg


Board: [CFI-1216A , PS5 FAT EDM-033]
Any ideas what to check next, or has anyone seen the issue like this?
 
VREFC (K1) seems to me to low. My readings at this pad is 1.3 V in diode mode. I would check the resistor. It should read 5.5k Ohm according to the edm-020 schematics.

Edit: VREFC (K1) is connected to ground at the edm-03x boards. Seems to be a 1 Ohm resistor.
 
Last edited by stetofix,
VREFC (K1) seems to me to low. My readings at this pad is 1.3 V in diode mode. I would check the resistor. It should read 5.5k Ohm according to the edm-020 schematics.

Edit: VREFC (K1) is connected to ground at the edm-03x boards. Seems to be a 1 Ohm resistor.
Can you share image which resistor to check? should I desorder it to check the resistance or it will be enough to check directly on the board resistance to the ground?
 

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