System-Diagnostic Lights - Dell P156G Service Manual

System-diagnostic lights

The power and battery status light indicates the power and battery status of the computer. These are the power states:
Solid white: Power adapter is connected, and the battery has more than 5% charge.
Amber: Computer is running on battery, and the battery has less than 5% charge.
Off:
● Power adapter is connected, and the battery is fully charged.
● Computer is running on battery, and the battery has more than 5% charge.
● Computer is in sleep state, hibernation, or turned off.
The power and battery-status light may also blink amber or white according to predefined "beep codes" indicating various
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.
NOTE: The following diagnostic light codes and recommended solutions are intended for Dell service technicians to
troubleshoot problems. You should only perform troubleshooting and repairs as authorized or directed by the Dell technical
support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty.
Table 17. Diagnostic-light codes
Diagnostic light codes
(Amber, white)
1,1
1,2
1,3
1,4
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
3,4
3,5
3,6
3,7
Problem description
TPM detection failure
Unrecoverable SPI flash failure
Short in hinge cable tripped OCP1
Short in hinge cable tripped OCP2
EC unable to program i-Fuse
EC internal Failure
Processor failure
System board: BIOS or ROM (Read-Only
Memory) failure
No memory or RAM (Random-Access Memory)
detected
Memory or RAM (Random-Access Memory)
failure
Invalid memory installed
System-board or chipset error
Display failure - SBIOS message
Display failure - EC detection of power rail
failure
CMOS battery failure
PCI, video card/chip failure
BIOS recovery image not found
Recovery image found but invalid
Power-rail failure
System BIOS Flash incomplete
Management Engine (ME) error
Troubleshooting 69