Repair Actions/0031: Difference between revisions
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== VREG Circuit == | == VREG Circuit == | ||
* Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL | * Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL | ||
* Check if V_5P0 and V_MEM | * Check if V_5P0 and V_MEM are present | ||
* If they are, replace the PWM driver and recheck PWRGD | * If they are, replace the PWM driver and recheck PWRGD | ||
* If they aren't, check VREG and PWM driver | * If they aren't, check VREG and PWM driver | ||
| Line 52: | Line 52: | ||
== VREG Circuit == | == VREG Circuit == | ||
* Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL | * Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL | ||
* Check if V_5P0 | * Check if V_5P0 is present | ||
* If it is, replace the PWM driver and recheck PWRGD | * If it is, replace the PWM driver and recheck PWRGD | ||
* If it isn't, check VREG and PWM driver | * If it isn't, check VREG and PWM driver | ||
{{Debug and Repair}} | {{Debug and Repair}} | ||
Revision as of 15:27, 21 June 2023
| Note This page is a technician's reference and is not intended to teach diagnosis and repair of electronic circuits. |
This error has a different meaning on the Original Xbox 360 vs the Xbox 360 S and Xbox 360 E. It is not used on Xenon motherboards.
Original
- ERROR_V_5P0_V_MEM
VREG_V5P0_VMEM_PWRGD is driven high by the V_5P0/V_MEM controller as long as the rail is within tolerance. If V_5P0 or V_MEM ever drops out of tolerance, the signal is de-asserted, causing the SMC to enter EC_FATAL and the 0031 code to be displayed on the front panel.
Short Circuit
- Check if V_5P0 or V_MEM are shorted
- If it is, check the rail to localize short
- Lift at least 1 pin of the inductor to isolate the rails before checking
- If V_MEM is shorted, check decoupling capacitors near each RAM
- If all components are fine but a short on V_MEM remains, replace the RAM and/or GPU
Enable and Power Good
- Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL
- Check VREG_V5P0_EN and VREG_V1P8_EN signals and pulldowns
- If pulldowns are fine but signal is missing, replace Southbridge
- Check VREG_V5P0_VMEM_PWRGD
- If present, replace Southbridge
- If missing, check pullup
- If pullup is fine, continue below
VREG Circuit
- Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL
- Check if V_5P0 and V_MEM are present
- If they are, replace the PWM driver and recheck PWRGD
- If they aren't, check VREG and PWM driver
S and E
- ERROR_V_5P0
VREG_V5P0_PWRGD is driven high by the V_5P0 controller as long as the rail is within tolerance. If V_5P0 ever drops out of tolerance, the signal is de-asserted, causing the SMC to enter EC_FATAL and the 0031 code to be displayed on the front panel.
Short Circuit
- Check if V_5P0 is shorted
- If it is, check circuit components to localize short
- Lift at least 1 pin of the inductor to isolate the rail before checking
Enable and Power Good
- Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL
- Check VREG_V5P0_EN signal and pulldown
- If pulldown is fine but signal is missing, replace Southbridge
- Check VREG_V5P0_PWRGD
- If present, replace Southbridge
- If missing, check pullup
- If pullup is fine, continue below
VREG Circuit
- Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL
- Check if V_5P0 is present
- If it is, replace the PWM driver and recheck PWRGD
- If it isn't, check VREG and PWM driver