PS5 Slim (EDM-140) powers on with beep + blue LED for ~2 seconds, then shuts off. No second beep.
PSU / basics
• PSU tested standalone: 12.15 V stable
• 12 V remains stable on motherboard during shutdown
• All fuses OK, HDMI visually fine
• Board fully cleaned, liquid metal removed, no visible corrosion
Voltages during power-on
• RAM VDD/VDDQ: ~1.37–1.38 V
• APU core: ~0.90–0.91 V
• Rails appear briefly, then drop when console shuts off
UART 80801510 – RAM calibration / impedance fault on Chip 5
After a light reflow of chip 5 it briefly reported 80801F12 (RAM hardware fault), then reverted back to 80801510 consistently.
RAM work
• Chip 5 removed
• New same-model GDDR6 installed, same error (UART 80801510 – RAM calibration / impedance fault on Chip 5)
• Multiple reflows performed
• Original chip reinstalled for comparison, same error (UART 80801510 – RAM calibration / impedance fault on Chip 5)
Same UART error with original RAM, new RAM, and reflowed RAM
Measurements
• RAM VDD/VDDQ → GND: ~23–26 Ω, equal across all banks
• Diode-mode checks show one shared RAM reference-type net with significantly lower readings, present even with the RAM chip removed. A shared RAM reference-type net (many pins on each RAM + many nearby MLCCs; “Net72” on PHAT boardviews) measures ~0.040 V in diode mode to GND across multiple points, while other nearby nets read ~0.24–0.37 V.
• Thermal camera: all RAM chips heat evenly during the short startup window
Status
• RAM IC itself does not appear to be the cause
• Power rails are present during startup
• Suspecting shared RAM reference / termination rail or passive component issue
Looking for input
• Best next steps on PS5 Slim RAM calibration faults
• Anyone seen 80801510 persist after confirmed-good RAM replacement
• Tips to isolate faulty passives on RAM reference / termination rails
