Dell XPS 17 9720 Service Manual - Page 68

Real-Time Clock (RTC Reset), Recovering the operating system

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The following table shows different power and battery-status light patterns and associated problems. Table 22. LED codes Diagnostic light codes 1,1 Problem description TPM detection failure 1,2 Unrecoverable SPI flash failure 1,5 i-Fuse failure 1,6 EC internal failure 2,1 Processor failure 2,2 System board: BIOS or ROM (Read-Only Memory) failure 2,3 No memory or RAM (Random-Access Memory) detected 2,4 Memory or RAM (Random-Access Memory) failure 2,5 Invalid memory installed 2,6 System board or chipset error 2,7 Display failure - SBIOS message 2,8 Display failure - EC detection of power rail failure 3,1 Coin-cell battery failure 3,2 PCI, video card/chip failure 3,3 BIOS Recovery Image not found 3,4 Recovery image found but invalid 3,5 Power-rail failure 3,6 System BIOS Flash incomplete 3,7 Management Engine (ME) error Real-Time Clock (RTC Reset) The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell systems from No POST/No Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models. Start the RTC reset with the system powered off and connected to AC power. Press and hold the power button for thirty (30) seconds . The system RTC Reset occurs after you release the power button. Recovering the operating system When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell SupportAssist OS Recovery. Dell SupportAssist OS Recovery is a standalone tool that is preinstalled in all Dell computers installed with Windows operating system. It consists of tools to diagnose and troubleshoot issues that may occur before your computer boots to the operating system. It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its factory state. 68 Troubleshooting

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The following table shows different power and battery-status light patterns and associated problems.
Table 22. LED codes
Diagnostic light codes
Problem description
1,1
TPM detection failure
1,2
Unrecoverable SPI flash failure
1,5
i-Fuse failure
1,6
EC internal failure
2,1
Processor failure
2,2
System board: BIOS or ROM (Read-Only
Memory) failure
2,3
No memory or RAM (Random-Access Memory)
detected
2,4
Memory or RAM (Random-Access Memory)
failure
2,5
Invalid memory installed
2,6
System board or chipset error
2,7
Display failure - SBIOS message
2,8
Display failure - EC detection of power rail
failure
3,1
Coin-cell battery failure
3,2
PCI, video card/chip failure
3,3
BIOS Recovery Image not found
3,4
Recovery image found but invalid
3,5
Power-rail failure
3,6
System BIOS Flash incomplete
3,7
Management Engine (ME) error
Real-Time Clock (RTC Reset)
The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell systems from No POST/No
Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models.
Start the RTC reset with the system powered off and connected to AC power. Press and hold the power button for
thirty (30) seconds
. The system RTC Reset occurs after you release the power button.
Recovering the operating system
When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell
SupportAssist OS Recovery.
Dell SupportAssist OS Recovery is a standalone tool that is preinstalled in all Dell computers installed with Windows operating
system. It consists of tools to diagnose and troubleshoot issues that may occur before your computer boots to the operating
system. It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its
factory state.
68
Troubleshooting