- Notes, cautions, and warnings
- Working inside your computer
- Removing and installing components
- Recommended tools
- Screw list
- Major components of Inspiron 15 5508
- Base cover
- Battery
- Memory modules
- Solid-state drive—M.2 slot one
- Solid-state drive—M.2 slot two
- Wireless card
- Fan
- Coin-cell battery
- Heat sink
- Display assembly
- Power-adapter port
- Speakers
- Power button with optional fingerprint reader
- Touchpad
- I/O board
- System board
- Palm-rest and keyboard assembly
- Drivers and downloads
- System setup
- Troubleshooting
- Getting help and contacting Dell
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- Administrer dine Dell EMC-websteder, -produkter og -kontaktpersoner på produktniveau ved hjælp af Company Administration (Virksomhedsadministration).
Inspiron 5508 Service Manual
Built-in self-test (BIST)
About this task
There are three different types of BIST to check the performance of display, power rail, and system board. These tests are important to evaluate if an LCD or system board needs a replacement.
- M-BIST: M-BIST is the system board built-in self-test diagnostics tool that improves the diagnostics accuracy of system board embedded controller (EC) failures. M-BIST must be manually initiated before POST and can also run on a dead system .
- L-BIST: L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST.
- LCD-BIST: LCD BIST is an enhanced diagnostic test that is introduced through Preboot System Assessment (PSA) on legacy systems.
| M-BIST | L-BIST | |
|---|---|---|
| Purpose | Evaluates the health condition of the system board. | Checks if the system board is supplying power to the LCD by performing an LCD Power Rail test. |
| Trigger | Press the <M> key and the power button. | Integrated into the single LED error code diagnostics. Automatically initiated during POST. |
| Indicator of fault | Battery LED light with Solid Amber | Battery LED error code of [2,8] blinks Amber x2, then pause, then blinks White x8. |
| Repair instruction | Indicates a problem with the system board. | Indicates a problem with the system board. |
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