Dell T7500 service manual Post Diagnostic Light Patterns

Page 13

Pb6

Pb7

Pb8

Pb9

Pb10

Pb11

Pb12

Pb13

Pb14

Pb15

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

ACPI S0, hand off to BIOS control

Reserved

Non-System board Regulator Failure

PSU Failure

PSU Cable Failure

System board Regulator Failure

Mismatch

Reserved

Reserved

Reserved

System on. BIOS not execution. This is the transition state to POST states.

Reserved

Apower failure has been detected on a plug-in component such as VRM, Video Riser, or Memory Riser.

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, missing a main power rail)

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)

Hardware detected a population incompatibility with a critical system component such as CPU, VRM, PSU, or

MEMORY RISER.

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

Light Pattern

Light

State

State

State Description

( 1 2 3 4 )

Description Name Assignment

 

 

1- Off

S0a2- Off OFF OFF Power light Off. No power is supplied to the system. 3- Off

4- Off

S0e

S1

1- Off

 

Normal

2- Off

 

ON

Operation,

3- Off

 

ACPI S0

4- Off

 

 

 

1- Off

 

System is in

2- Off

 

RCM

Recovery

3- Off

 

Mode

4- Solid

 

 

 

1- Off

 

 

2- Off

 

 

Power light Solid Green. System has successfully booted and is operating normally.

BIOS checksum failure was detected and the system is now in recovery mode.

CPU configuration activity is in progress or a CPU

Image 13
Contents Rev. A01 Before Working Inside Your Computer Working on Your ComputerAfter Working Inside Your Computer Turning Off Your ComputerWindows Vista Windows XP Click Start→ Turn Off Computer→ Turn OffAdding and Replacing Parts System Information ProcessorMemory VideoExpansion Bus ConnectorsDrives Controls and Lights USBPhysical PowerEnvironmental 1985 Dell Diagnostics DiagnosticsOption Function Power Button Light CodesTab Function Pre-POST Diagnostic Light Patterns Diagnostic Light CodesPost Diagnostic Light Patterns Beep Codes Beep Description Code System Beep CodesAbout Memory Memory Subsystem Memory Population Rules Page About Your System Board System Board SchematicClearing Cmos Settings Clearing Forgotten PasswordsPage Boot Menu System SetupEntering System Setup Post KeystrokesNavigation Keystrokes System Setup Navigation KeystrokesAction Keystroke Removing the Cover CoverPage Page Removing the Battery BatteryRemove the coin-cell battery from the computer Page Removing the Hard Drives Hard DrivesPage Page Page Removing the Hard-drive Cage Hard-drive CagePage Repeat the process for the second hard-drive cage Page Removing the Front Fan Assembly Front Fan AssemblyPage Remove the fan assembly from the computer Page Removing the Memory Shroud Memory ShroudRemove the memory shroud from the computer Removing an Expansion Card Expansion CardsPage Page Removing the Processor Fan Processor FanPage Remove the chipset fan from the computer Page Removing the Dual Processor Riser Guide Dual Processor Riser GuidePage Page Page Removing the Power Supply Power SupplyPage Page Page Removing the Chassis Intrusion Switch Chassis Intrusion SwitchPage Page Page Removing the Hard-drive Bezel Hard-drive BezelPage Page Removing the Hard Drive Fan Hard Drive FanPage Page Removing the Optical Drive Optical DrivePage Page Page Removing the Rear Fan Rear FanPage Remove the fan from the computer Page Removing the Memory Modules MemoryPage Page Removing the Heat Sink and Processor Heat Sink and ProcessorPage Page Remove the processor from the computer Page Removing the Optional Dual Processor Riser Dual Processor Riser OptionalPage Page Page Page Page Page Page Page Removing the I/O Panel PanelDisconnect the data cable Disconnect the USB cable Page Page Removing the System Board System BoardPage Page Disconnect the floppy cable Disconnect the I/O panel cable Page Page Page Page Remove the system board from the chassis
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