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Entry level business laptop introduced by Dell in 2014. Uses Intel Haswell (4th generation) processors.

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bios Post Failure, display comes sometimes no

I have Dell Laptop, when i power on it post failure, display comes sometimes after long sometime no display.

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In my experience with the IGP Haswell Dell Latitudes, the issue is a mixed bag - on the ones where they crammed the i7 MQ/8790M (15” E6540), the GPU is usually bad - they’re cramming 82W of total TDP through ONE fan, so the GPU is usually bad.

On the E6440 8690M/i5 M, it’s usually a display issue but the GPU could also be bad. On the i5/Intel HD configuration, typically a bad screen.

What I would do first on a machine like this is strip it down to the bare minimum on what is installed based on what is there and what is likely the issue. If it was a no boot issue, I may opt to remove the keyboard and then disconnect any accessories like the trackpad and volume buttons. Once that fails, go for the CMOS battery, press the power button to remove any flea power and let it sit unplugged for 5-10 minutes to get a fresh BIOS to work with. If that doesn’t work, I go for the WiFi/WWAN cards, optical drive and SSD until I get it to boot again. Once it boots, it all goes back in until I know what did it.

However, even if you continue to have issues after stripping it down, the definitive way to determine if it’s the board is to use the built-in LCD test - if the display works, it’s the board. if the computer works but not the display, there’s an issue with the display. What you want to do to test this is to press and hold down the D key and press the power button, and see how the computer behaves.

WARNING: ON THE E6X40 SERIES, there are TWO display types - LVDS and iDP and they go to the following configurations:

  • LVDS: Intel HD
  • iDP: Radeon 86/8790M+Intel HD
    • Note: Some Intel HD E6X40’s use the iDP display as well - check to be sure.

Since it’s a known issue on the E6 series, I would strongly advise checking the service tag for any clues of the iDP panel and making sure you know which connector goes to each type. See this for an example of that the iDP machines show up on the Dell system configuration to get an idea of what to look for:

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It’s especially important to know if you look for a bare replacement display but say, you find the entire assembly for not much more and it may potentially have a higher resolution panel or be in better shape cosmetically. The sellers never seem to know, so go with your gut and check the connector in the photos.

As another aide to spot the difference, I have attached a photo of the more common LVDS board connection so you can quickly identify it from the iDP version when you check the connector type:

Block Image

If you want to see the iDP connector, I have one I can use for it.

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