Dell PowerEdge 1750 Service Manual download pdf (Page 13)

System Board LED Codes

The system board LEDs are visible only when the covers are open. Table3-7 lists the system board LED codes and their meanings.



Table 3-7.SystemBoardLEDCodes

Warning Messages

2-1-1

through

2-4-4

Bitfailureinthefirst64KBofmainmemory

3-1-1

Slave DMA-register failure

Replace the system board. See "System Board."

3-1-2

Master DMA-register failure

3-1-3

Master interrupt-mask register failure

3-1-4

Slave interrupt-mask register failure

3-2-4

Keyboard-controller test failure

Check the keyboard cable and connector for proper connection. If the problem persists, replace

the keyboard. If the problem persists, replace the system board. See "System Board."

3-3-1

CMOS failure

Replace the system board. See "System Board."

3-3-2

System configuration check failure

3-3-3

Keyboard controller not detected

3-3-4

Screen initialization failure

3-4-2

Screen-retrace test failure

3-4-3

Search for video ROM failure

4-2-1

No timer tick

4-2-2

Shutdown failure

4-2-3

Gate A20 failure

4-2-4

Unexpected interrupt in protected mode

Ensure that all expansion cards are properly seated, and then reboot the system. See

"Expansion Cards."

4-3-1

Improperly seated or faulty memory modules

Remove and reseat the memory modules. See "Memory." If the problem persists, replace the

memory modules. If the problem persists, replace the system board. See "System Board."

4-3-3

Defective system board

Replace the system board. See "System Board."

4-3-4

Time-of-day clock stopped

Replace the battery. See "System Battery." If the problem persists, replace the system board.

See "System Board."

4-4-1

Super I/O chip failure (defective system board)

Replace the system board. See "System Board."

4-4-3

Microprocessor frequency mismatch. Occurs

when the front-side (external) bus speed of a

microprocessor is not supported.

If video is available, a screen message identifies the faulty microprocessor. Replace the

microprocessor with a supported microprocessor. See "Microprocessors." If video is not

available, replace microprocessor 1 and then, if the problem persists, replace microprocessor 2.

4-4-4

Cache test failure (defective microprocessor)

Remove and reseat the microprocessor(s). See "Microprocessors." If the problem persists,

replace the microprocessor(s). If the problem persists, replace the system board. See "System

Board."

LED Indicator

Normal Operation

Error Condition

FANn_LED

(Located by each fan.)

Green

Blinking amber: A problem exists with the

associated fan.

THERMTRIP

(Located near the front left corner of the system board.)

Off

Amber: One or both of the processors

are overheated.

MISMATCH

(Located near the front left corner of the system board.)

Off

Amber: Processors do not match.

VRM1_OK

(Located near the edge of the system board by VRM1.)

Green

Off: Processor 1 VRM is disabled.

VRM2_OK

(Located near the edge of the system board by VRM2.)

Green if two processors are installed or off if only

one processor is installed.

Off if two processors are installed.

D_12V

(Located near the front left corner of the system board,

near the PS_PWR connector.)

Green

Off: System 12-V power is not available.

D_3VAUX

(Located near the front left corner of the system board,

near the PS_PWR connector.)

Green

System 3.3-V auxiliary power is not

available.

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