Dell Precision T5500 Service Manual - Page 11

State, Light Pattern, 1 2 3 4, Light, Description, State Assignment, State Description, Power light - cpu riser

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Pb2 Pb3 Pb4 Pb5 Pb6 Pb7 Pb8 Pb9 Pb10 Pb11 Pb12 Pb13 Pb14 Pb15 1- Off 2- Off 3- Solid 4- Off 1- Off 2- Off 3- Solid 4- Solid 1- Off 2- Green 3- Off 4- Off 1- Off 2- Green 3- Off 4- Green 1- Off 2- Green 3- Green 4- Off 1- Off 2- Blink 3- Blink 4- Blink 1- Green 2- Off 3- Off 4- Off 1- Blink 2- Off 3- Off 4- Blink 1- Blink 2- Off 3- Blink 4- Off 1- Blink 2- Off 3- Blink 4- Blink 1- Blink 2- Blink 3- Off 4- Off 1- Blink 2- Blink 3- Off 4- Blink 1- Green 2- Green 3- Green 4- Off 1- Green 2- Green 3- Green 4- Green Reserved Reserved ACPI S3 Suspend to RAM Windows Standby State. Reserved Reserved Reserved Reserved Reserved Reserved ACPI S0, hand off System on. BIOS not execution. This is the transition state to POST states. to BIOS control Reserved Reserved Non-System board Regulator Failure A power failure has been detected on a plug-in component such as VRM, Video Riser, or Memory Riser. PSU Failure PSU may be bad or PSU cable may be crimped creating a short on a main power rail. (PS_ON asserted, PS_PWRGOOD not asserted) All PSU cables may not be properly connected to system board. (PS_ON asserted, PSU Cable Failure missing a main power rail) System board Regulator Failure A power failure has been detected in one of the onboard system board regulators. This could be caused by a failed system board component or by a plug-in device creating a short on a regulated power rail. (PS_ON asserted, PS_PWRGOOD asserted, SYS_PWRGOOD de-asserted) Mismatch Hardware detected a population incompatibility with a critical system component such as CPU, VRM, PSU, or MEMORY RISER. Reserved Reserved Reserved Reserved POST Diagnostic Light Patterns All POST codes except S0 are accompanied by a Solid Green Power light state. If the power light is not green, see Pre-POST Diagnostic Light Patterns. State S0a S0e S1 S2 S3 S4 Light Pattern ( 1 2 3 4 ) Light State State Assignment Description Name State Description 1- Off 2- Off 3- Off 4- Off OFF OFF Power light Off. No power is supplied to the system. 1- Off 2- Off 3- Off 4- Off Normal Operation, Power light Solid Green. System has successfully booted and is operating ON ACPI S0 normally. 1- Off 2- Off 3- Off 4- Solid RCM System is in Recovery Mode BIOS checksum failure was detected and the system is now in recovery mode. 1- Off 2- Off 3- Solid 4- Off CPU CPU CPU configuration activity is in progress or a CPU failure was detected. 1- Off 2- Off 3- Solid 4- Solid MEM Memory Memory subsystem configuration activity is in progress. Appropriate memory modules were detected but a memory failure has occurred. 1- Off 2- Solid 3- Off 4- Off PCI PCI device PCI device configuration activity is in progress or PCI device failure was detected.

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POST Diagnostic Light Patterns
All POST codes except S0 are accompanied by a Solid Green Power light state. If the power light is not green, see
Pre
-
POST Diagnostic Light Patterns
.
Pb2
1- Off
2- Off
3- Solid
4- Off
-
Reserved
Reserved
Pb3
1- Off
2- Off
3- Solid
4- Solid
ACPI S3
Suspend to RAM Windows Standby State.
Pb4
1- Off
2- Green
3- Off
4- Off
-
Reserved
Reserved
Pb5
1- Off
2- Green
3- Off
4- Green
-
Reserved
Reserved
Pb6
1- Off
2- Green
3- Green
4- Off
-
Reserved
Reserved
Pb7
1- Off
2- Blink
3- Blink
4- Blink
ACPI S0, hand off
to BIOS control
System on. BIOS not execution. This is the transition state to POST states.
Pb8
1- Green
2- Off
3- Off
4- Off
-
Reserved
Reserved
Pb9
1- Blink
2- Off
3- Off
4- Blink
Non-System
board Regulator
Failure
A power failure has been detected on a plug-in component such as VRM, Video Riser,
or Memory Riser.
Pb10
1- Blink
2- Off
3- Blink
4- Off
PSU Failure
PSU may be bad or PSU cable may be crimped creating a short on a main power rail.
(PS_ON asserted, PS_PWRGOOD not asserted)
Pb11
1- Blink
2- Off
3- Blink
4- Blink
PSU Cable Failure
All PSU cables may not be properly connected to system board. (PS_ON asserted,
missing a main power rail)
Pb12
1- Blink
2- Blink
3- Off
4- Off
System board
Regulator Failure
A power failure has been detected in one of the onboard system board regulators.
This could be caused by a failed system board component or by a plug-in device
creating a short on a regulated power rail. (PS_ON asserted, PS_PWRGOOD
asserted, SYS_PWRGOOD de-asserted)
Pb13
1- Blink
2- Blink
3- Off
4- Blink
Mismatch
Hardware detected a population incompatibility with a critical system component
such as CPU, VRM, PSU, or MEMORY RISER.
Pb14
1- Green
2- Green
3- Green
4- Off
-
Reserved
Reserved
Pb15
1- Green
2- Green
3- Green
4- Green
-
Reserved
Reserved
State
Light Pattern
( 1 2 3 4 )
Light
Description
State
Name
State Assignment
State Description
S0a
1- Off
2- Off
3- Off
4- Off
OFF
OFF
Power light Off.
No power is supplied to the system.
S0e
1- Off
2- Off
3- Off
4- Off
ON
Normal Operation,
ACPI S0
Power light Solid Green.
System has successfully booted and is operating
normally.
S1
1- Off
2- Off
3- Off
4- Solid
RCM
System is in
Recovery Mode
BIOS checksum failure was detected and the system is now in recovery mode.
S2
1- Off
2- Off
3- Solid
4- Off
CPU
CPU
CPU configuration activity is in progress or a CPU failure was detected.
S3
1- Off
2- Off
3- Solid
4- Solid
MEM
Memory
Memory subsystem configuration activity is in progress. Appropriate memory
modules were detected but a memory failure has occurred.
S4
1- Off
2- Solid
3- Off
4- Off
PCI
PCI device
PCI device configuration activity is in progress or PCI device failure was detected.