Dell Precision T5500, Service Manual

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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.