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Voici quelques outils couramment utilisés pour travailler sur cet appareil. Vous ne devriez pas avoir besoin de tous les outils pour chaque procédure.
Common hardware faults
- Discrete GPU (AMD Radeon HD 8790M models only)
Common failure points:
NOTE: Commonly failing parts (Ex: Battery and hard drive) have been excluded as these are known to be wear items and are expected to fail.
Power supply (Note: Only impacts adapters that predate the 0VJCH5 130W adapter)
Most legacy 130W power adapters are known to have issues with the sense IC, which prevents the laptop from charging. The adapter must be replaced when it happens, but it is possible to get some additional time out of it while you wait for a new one.
- Unplug the adapter from the wall and laptop.
- Wait for the blue ring to die out.
- Plug the power adapter into the wall.
- Plug it back into the laptop.
These steps should bring the adapter back into a state it works, but be aware it will eventually happen again. This also only works a handful of times before it no longer helps and you will lose your battery until it is replaced.
AMD Radeon 8790M GPU failure
These systems are known to have a serious design flaw that only impacts dual GPU versions of the system (HD Graphics/AMD Radeon 8790M). IGP only models are not impacted, but WILL have fewer screen options outside of ex company models with the FHD panel that was not available to end users; MANY OF THESE use the 768p LVDS panel. Intel HD systems with an eDP screen/board are ex corporate. IT IS NOT POSSIBLE to use the eDP screen on the LVDS board.
The cause of GPU failure on these systems is related to poor cooling. On dual GPU variants (Intel HD Graphics/AMD 8790M), the cooler uses a single vent point that is not able to properly cool these systems. In addition, MQ models will run hotter then M variants due to the 10W TDP differental with MQ processors. Most of these systems will not run at their true potential due to this design flaw, as many use the MQ processors.
If your GPU fails, it is soldered to the motherboard and must be replaced by a professional. This is out of reach for most people due to the average cost of the job. It is generally cheaper to get a refurbished motherboard without a service tag programmed to fix these systems when the GPU fails.
Once the issue is repaired (or the board is replaced), using quality thermal paste (and pads on the VRAM) will delay the failure of the new board, but not prevent it. If you are buying one of these systems used, AVOID AMD Radeon 8790M variants due to this serious design flaw. Quality thermal paste helps, but only delays the failure.
While this is common on all Dell laptops, the E6540 has more keyboard failures then most other laptops. Replacing the keyboard is almost completely unavoidable unless the system is coddled.
Installation of a backlit keyboard is recommended on systems that never shipped with this. It can be interchanged on these systems due to how the microcontroller setup is configured on these laptops.
In a Windows environment, this machine has issues with hibernation. This can be fixed by resetting the S2 hibernation mode when it's persistent. There are no other options to fix it that will work, outside of installing more RAM as a mitigation strategy. The best sign for this is a volmgr error in Event Viewer.
BIOS fixes will need to be released by Dell due to Intel Boot Guard.
Note: You can use a higher wattage adapter then the computer shipped with. However, downgrading is not an option. If you are having power supply problems with 45W or 65W factory adapters (i5/dual core i7), the best replacement for these is a genuine 90W. The Dell Slim adapter is recommended, as it is the easiest to locate.
- 45W (Core i5 4300/4310M)
- 65W (Core i7 4600/4610M)
- 130W (Core i7 4800/4810MQ)
Background and Identification
The Dell Latitude E6540 was introduced in 2013, making Dell one of the first companies to have a Haswell business laptop available for sale. This gave Dell an edge with Haswell.
This machine has shipped with many processor, video card and screen configurations. Look up the service tag and pull up the specifications to find out how the system shipped from the factory if you want to see if it was upgraded.
Locating the serial number
The Service tag and Express service code is located on the bottom access panel under the primary air intake vent, and can also be read in the BIOS. To look in the BIOS, the best way to get into the BIOS is to press the F2 key. Once you are in the system BIOS, find System Information under General.