Diagnostic Leds; M-Bist - Dell Latitude 3300 Service Manual

Diagnostic LEDs

Instead of beep codes, errors are indicated via the bicolor Battery Charge/Status LED. A specific blink pattern is followed by flashing a
pattern of flashes in amber, followed by white. The pattern then repeats.
NOTE: The diagnostic pattern will consist of a two-digit number being represented by a first group of LED blinks (1
through 9) in amber, followed by a 1.5 second pause with the LED off, and then a second group of LED blinks (1 through
9) in white. This is then followed by a three second pause, with the LED off, before repeating over again. Each LED blink
takes 1.5 seconds.
The system will not shutdown when displaying the Diagnostic Error Codes.
Diagnostic Error Codes will always supersede any other use of the LED. For instance, on laptops, battery codes for Low Battery or Battery
Failure situations will not be displayed when Diagnostic Error Codes are being displayed.
Table 9. Diagnostic LEDs
Blinking Problem Description
Pattern
Amber White
2 1 CPU failure
2 2 System board failure (included BIOS corruption or ROM error)
2 3 No memory/RAM detected
2 4 Memory/RAM failure
2 5 Invalid memory installed
2 6 System board/Chipset error
2 7 LCD failure
2 8 LCD Power rail failure
3 1 CMOS battery failure
3 2 PCI or Video card/chip failure
3 3 BIOS Recovery Image not found
3 4 BIOS Recovery Image found but invalid
NOTE: For diagnostics pattern 2-amber, 8-white connect an external monitor to isolate between system board or
graphics controller failure.

M-BIST

M-BIST (Built In Self-Test) diagnostics tool, featuring improved accuracy in system board failures.
NOTE: M-BIST can be manually initiated before POST (Power On Self Test).
How to run M-BIST
NOTE: M-BIST must be initiated on the system from a power-off state either connected to AC power or with battery
only.
1. Press and hold both the M key on the keyboard and the power button to initiate M-BIST.
2. With both the M key and the power button that is held down, the battery indicator LED may exhibit two states:
a. OFF: No fault detected with the system board
Suggested Resolution
Replace the system board.
Flash latest BIOS version. If problem persists,
replace the system board.
Confirm that the memory module is installed
properly. If problem persists, replace the
memory module.
Replace the memory module.
Replace the memory module.
Replace the system board.
Replace the LCD module.
Replace the system board.
Replace the RTS battery.
Replace the system board.
Flash latest BIOS version. If problem persists,
replace the system board.
Flash latest BIOS version. If problem persists,
replace the system board.
Diagnostics 95