Dell Latitude 9420 Service Manual - Page 77

System diagnostic lights

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System diagnostic lights Battery-status light Indicates the power and battery-charge status. Solid white - Power adapter is connected and the battery has more than 5 percent charge. Amber - Computer is running on battery and the battery has less than 5 percent charge. Off ● Power adapter is connected and the battery is fully charged. ● Computer is running on battery and the battery has more than 5 percent charge. ● Computer is in sleep state, hibernation, or turned off. The power and battery-status light blinks amber along with beep codes indicating failures. For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected. The following table shows different power and battery-status light patterns and associated problems. Blinking Pattern 1 1 1 2 1 5 1 6 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 3 1 3 2 3 3 Problem description Suggested resolution TPM detection failure Replace the system board. Unrecoverable SPI flash failure Replace the system board. EC unable to program i-Fuse Replace the system board. Generic catch-all for ungraceful EC code flow errors Disconnect all power source (AC, battery, coin cell) and drain flea power by pressing & holding down power button. CPU failure Run the Intel CPU diagnostics tools. If problem persists, replace the system board. System Board failure (included BIOS corruption or ROM error) Flash latest BIOS version. If problem persists, replace the system board. No Memory / RAM detected Memory is integrated, replace the system board Memory / RAM failure Memory is integrated, replace the system board Invalid memory installed Memory is integrated, replace the system board System board / Chipset Error Replace the system board. LCD failure (SBIOS message) Replace the LCD module. LCD failure (EC detection of power rail failure) Replace the system board. CMOS battery failure Reset the CMOS battery connection. If problem persists, replace the RTC battery. PCI or Video card/chip failure Replace the system board. BIOS recovery image not found Flash latest BIOS version. If problem persists, replace the system board. Troubleshooting 77

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System diagnostic lights
Battery-status light
Indicates the power and battery-charge status.
Solid white
— Power adapter is connected and the battery has more than 5 percent charge.
Amber
— Computer is running on battery and the battery has less than 5 percent charge.
Off
●
Power adapter is connected and the battery is fully charged.
●
Computer is running on battery and the battery has more than 5 percent charge.
●
Computer is in sleep state, hibernation, or turned off.
The power and battery-status light blinks amber along with beep codes indicating failures.
For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times
followed by a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.
The following table shows different power and battery-status light patterns and associated problems.
Blinking Pattern
Problem description
Suggested resolution
1
1
TPM detection failure
Replace the system board.
1
2
Unrecoverable SPI flash failure
Replace the system board.
1
5
EC unable to program i-Fuse
Replace the system board.
1
6
Generic catch-all for ungraceful
EC code flow errors
Disconnect all power source
(AC, battery, coin cell)
and drain flea power by
pressing & holding down
power button.
2
1
CPU failure
Run the Intel CPU
diagnostics tools. If problem
persists, replace the system
board.
2
2
System Board failure (included
BIOS corruption or ROM error)
Flash latest BIOS version.
If problem persists, replace
the system board.
2
3
No Memory / RAM detected
Memory is integrated,
replace the system board
2
4
Memory / RAM failure
Memory is integrated,
replace the system board
2
5
Invalid memory installed
Memory is integrated,
replace the system board
2
6
System board / Chipset Error
Replace the system board.
2
7
LCD failure (SBIOS message)
Replace the LCD module.
2
8
LCD failure (EC detection of
power rail failure)
Replace the system board.
3
1
CMOS battery failure
Reset the CMOS battery
connection. If problem
persists, replace the RTC
battery.
3
2
PCI or Video card/chip failure
Replace the system board.
3
3
BIOS recovery image not found
Flash latest BIOS version.
If problem persists, replace
the system board.
Troubleshooting
77