Indbygget Selvtest Af Skærmpanel (Lcd-Bist); System Diagnostic Lights - Dell Precision 7550 Service Manual

Indbygget selvtest af skærmpanel (LCD-BIST)
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Trin
1. Hold tasten D nede, og tryk på tænd/sluk-knappen.
2. Slip både tasten D og tænd/sluk-knappen, når computeren starter POST.
3. Skærmpanelet begynder at vise en enkelt farve eller skifte mellem forskellige farver.
BEMÆRK: Farvesekvensen kan variere afhængigt af producenten af skærmpanelet. Brugeren skal blot sikre, at
farverne vises korrekt uden forvrængning eller grafiske afvigelser.
4. Computeren genstartes, når den sidste farve er vist.

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.
Table 7. LED codes
Diagnostic light codes
1,1
Problem description
TPM Detection Failure
Recommended Solution
Replace System Board
Fejlfinding 99