Dell Precision T5500 Service Manual page 11

1- Off
2- Off
Pb2
3- Solid
4- Off
1- Off
2- Off
Pb3
3- Solid
4- Solid
1- Off
2- Green
Pb4
3- Off
4- Off
1- Off
2- Green
Pb5
3- Off
4- Green
1- Off
2- Green
Pb6
3- Green
4- Off
1- Off
2- Blink
Pb7
3- Blink
4- Blink
1- Green
2- Off
Pb8
3- Off
4- Off
1- Blink
2- Off
Pb9
3- Off
4- Blink
1- Blink
2- Off
Pb10
3- Blink
4- Off
1- Blink
2- Off
Pb11
3- Blink
4- Blink
1- Blink
2- Blink
Pb12
3- Off
4- Off
1- Blink
2- Blink
Pb13
3- Off
4- Blink
1- Green
2- Green
Pb14
3- Green
4- Off
1- Green
2- Green
Pb15
3- Green
4- Green
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
Light Pattern Light
State
( 1 2 3 4 ) Description
1- Off
2- Off
S0a
3- Off
4- Off
1- Off
2- Off
S0e
3- Off
4- Off
1- Off
2- Off
S1
3- Off
4- Solid
1- Off
2- Off
S2
3- Solid
4- Off
1- Off
2- Off
S3
3- Solid
4- Solid
1- Off
2- Solid
S4
3- Off
4- Off
- 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
A power failure has been detected on a plug-in component such as VRM, Video Riser,
board Regulator
or Memory Riser.
Failure
PSU may be bad or PSU cable may be crimped creating a short on a main power rail.
PSU Failure
(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)
A power failure has been detected in one of the onboard system board regulators.
System board This could be caused by a failed system board component or by a plug-in device
Regulator Failure creating a short on a regulated power rail. (PS_ON asserted, PS_PWRGOOD
asserted, SYS_PWRGOOD de-asserted)
Hardware detected a population incompatibility with a critical system component
Mismatch
such as CPU, VRM, PSU, or MEMORY RISER.
- Reserved Reserved
- Reserved Reserved
State
State Assignment
Name
OFF OFF Power light Off. No power is supplied to the system.
Normal Operation, Power light Solid Green. System has successfully booted and is operating
ON
ACPI S0 normally.
System is in
RCM BIOS checksum failure was detected and the system is now in recovery mode.
Recovery Mode
CPU CPU CPU configuration activity is in progress or a CPU failure was detected.
Memory subsystem configuration activity is in progress. Appropriate memory
MEM Memory
modules were detected but a memory failure has occurred.
PCI PCI device PCI device configuration activity is in progress or PCI device failure was detected.
Pre-POST Diagnostic Light Patterns.
State Description