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Introdução

If the computer may start to boot but then shuts down, increased Windows errors or "blue screens of death” the computer may freeze for seemingly no reason, or connected devices that worked before suddenly won’t work, replace the motherboard on the HP EliteBook 840 G1

  1. Working on your device while it is turned on may result in electric shock. Make sure to shut down and unplug your device before you begin.
    • Working on your device while it is turned on may result in electric shock. Make sure to shut down and unplug your device before you begin.

    • Slide the latch, to the right, away from the lock symbol.

    • Slide the cover away from the latch to remove it.

    Slide to your "other left", on this screen it would be to the right, to slide open the cover

    petunia8107 - Responder

    l’expression “Détachez le cache du loquet pour le retirer “ est ambigüe et source d’erreur, elle donne à penser qu’il faut retirer un “cache” qui serait sur le loquet.

    Ce qu’il faut c’est détacher le cache (la grande plaque où il y a la logo bleu) de la partie fixe sur laquelle se trouve le loquet. Pour ça il faut glisser une lame fine dans la fente entre le cache et la partie fixe.

    merci pour le tutoriel.

    Philippe Fayolle - Responder

    Bonjour Philippe,

    Vous avez bien raison ! J’ai adapté la traduction. Merci pour l’observation ! N’hésitez pas à corriger le texte la prochaine fois. Vous trouverez l’interface de traduction en cliquant sur Traduire en haut à droite de l’étape.

    Bonne réparation !

    Claire Miesch -

  2. Once the cover is removed you will be able to see the battery and the two latches that hold it in place.
    • Once the cover is removed you will be able to see the battery and the two latches that hold it in place.

    • The two latches should be pulled back, one of which is spring loaded and must be held in place in order to remove the battery.

  3. Battery should easily be lifted up and out.
    • Battery should easily be lifted up and out.

  4. Identify the RAM and the pull tabs that will be used in the next step.
    • Identify the RAM and the pull tabs that will be used in the next step.

    • Always use an anti-static wrist strap when working on a computer.

  5. Pull back the two tabs on either side of the RAM this will allow the RAM to be removed.
    • Pull back the two tabs on either side of the RAM this will allow the RAM to be removed.

    • When handling a memory module, use care to prevent touching the memory chips on the board. Touching the memory chips could damage or destroy the memory.

  6. Pull the RAM stick gently out and up once the tabs have been pulled to the side.
    • Pull the RAM stick gently out and up once the tabs have been pulled to the side.

  7. Loosen the four Phillips screws securing the hard drive. These screws will stay captive to the plastic hard drive bracket.
    • Loosen the four Phillips screws securing the hard drive.

    • These screws will stay captive to the plastic hard drive bracket.

    These are J1 Phillips screws

    Bradley Pinkston - Responder

  8. Grab the pull tab on the hard drives plastic casing and pull it out and to the side.
    • Grab the pull tab on the hard drives plastic casing and pull it out and to the side.

    • Make sure all screws have been properly loosened and are no longer connected at the bottom before doing this step.

    • Remove the 2.5" hard drive from the plastic bracket.

    Festplatte ist leer wie bekomm ich Windows drauf

    Böhser Ossi - Responder

  9. In order to take out the fan and heatsink the plastic cover must first be taken off.
    • In order to take out the fan and heatsink the plastic cover must first be taken off.

    • Remove the eight 2 mm Phillips #1 screws.

  10. Remove SD card by sliding it out.
    • Remove SD card by sliding it out.

  11. Remove the thirteen 6 mm Torx T8 screws. Some screws have plastic covers over them that need to be pried out before the screws can be removed. Remove the five Torx M2.5x5 screws.
    • Remove the thirteen 6 mm Torx T8 screws.

    • Some screws have plastic covers over them that need to be pried out before the screws can be removed.

    • Remove the five Torx M2.5x5 screws.

    • Remove the single 7 mm Phillips #1 screw.

    • Loosen the two Phillips #1 screws. These screws will remain captive to the device.

    T8 Torx screws - I had something like 16 before the black bottom cover removal was possible, and two (marked here as offset from the bottom edge) were not installed at all, so there are 5 total in places not marked in the above photo.

    Daniel Powell - Responder

    I had 16 of them as well. The missing ones are:

    1. Right next to Ethernet drop jaw.

    2. To the left of the battery connector.

    3. Next to VGA, right above the fan.

    Arthur Dubrovsky - Responder

    I actually had 18. The additional ones are between the fan and the RAM slots, and between the fan and battery.

    Aldric Degorre - Responder

    Sorry, I actually had 16, but two from the picture did not exist (and I cannot edit my comment anymore !).

    Aldric Degorre - Responder

    Several screws are missing, one near the ethernet port, and 3 out in the middle, and 1 near the fan (inline with the two below the fan)

    Michael Gardner - Responder

    Do I need to purchase the exact model fan with the sbs number the same?

    toni.edie - Responder

    I added the missing M2.5x5 screws, also deleted the step to remove the keyboard since it’s not needed if you want to replace the fan.

    waltergg - Responder

  12. Using the plastic opening tools, remove the plastic cover by beginning at one of the corners and prying it up. Using the plastic opening tools, remove the plastic cover by beginning at one of the corners and prying it up.
    • Using the plastic opening tools, remove the plastic cover by beginning at one of the corners and prying it up.

  13. Use the plastic opening tools to remove the keyboard, starting at one of the top corners. You need to lift the top side and then takeing it out  moving the keyboard towards the screen. Once the keyboard is removed, detach the ribbons connecting the keyboard to the laptop by prying the small tab and sliding the ribbon out.
    • Use the plastic opening tools to remove the keyboard, starting at one of the top corners. You need to lift the top side and then takeing it out moving the keyboard towards the screen.

    • Once the keyboard is removed, detach the ribbons connecting the keyboard to the laptop by prying the small tab and sliding the ribbon out.

    Keyboard removal was not necessary to remove the fan for me. Once you get the bottom shell off, the fan subassembly is completely accessible.

    Daniel Powell - Responder

    There is a hole by the fan to push the keyboard out instead of prying it out.

    Paul Yoder - Responder

    True, i used the hole by the fan to push the keyboard out.

    LRD - Responder

  14. Loosen the six Phillips #1 screws. These will remain captive to the heatsink. Loosen the six Phillips #1 screws. These will remain captive to the heatsink.
    • Loosen the six Phillips #1 screws. These will remain captive to the heatsink.

    Heatsink removal is not necessary to take the fan out. You can remove just the fan with its two screws if that is the only thing needing replacement. Like for mine, the fan bearings were bad, but the heatsink was okay though a little dusty..

    Remember, though, to have fresh thermal grease ready if you do decide to remove the heatsink anyway.

    Daniel Powell - Responder

    Warning: I removed the heatsink and now that I’ve re-applied the paste it no longer makes any contact at all with the graphics substrate and barely any with the CPU. HP have a habit of splurging several mm of paste onto their CPUs during manufacture and this has either bent the heatsink or it’s just a poor design full stop. I guess I’ll get a thermal pad and use that as it’s at least designed to conduct heat probably better than an ocean of thermal paste would

    T H - Responder

    Yes, it could work, you can also try to unbend the heat sink but this laptop can become very hot, if the heat sink is bent, you should consider a heatsink replacement for an optimal heat dissipation.

    Brendan -

  15. Use the plastic opening tools to remove the tape covering the wires connected from the fan  to the motherboard.
    • Use the plastic opening tools to remove the tape covering the wires connected from the fan to the motherboard.

    • Disconnect the fan by sliding the wire out.

  16. Remove the fan by lifting it up and sliding it out. Remove the heat sink by lifting it up and sliding it out.
    • Remove the fan by lifting it up and sliding it out.

    • Remove the heat sink by lifting it up and sliding it out.

  17. Disconnect the two antenna cables.
    • Disconnect the two antenna cables.

    • They are labeled as 1 and 2 and should go back to the same place when put back.

  18. Remove the single 3 mm Phillips #1 screw securing the wireless card.
    • Remove the single 3 mm Phillips #1 screw securing the wireless card.

  19. Remove the three 4 mm Phillips #1 screws. Remove the single 2 mm Phillips #1 screw.
    • Remove the three 4 mm Phillips #1 screws.

    • Remove the single 2 mm Phillips #1 screw.

  20. Remove both ribbons marked.
    • Remove both ribbons marked.

    • Before removing the ribbon pry the small black tabs that seat them.

  21. Pry the grey plastic tab from the orange tab to free it.
    • Pry the grey plastic tab from the orange tab to free it.

    • Repeat for the clear plastic tab.

  22. Disconnect the cables by taking off the tape and getting them out from under the plastic.
    • Disconnect the cables by taking off the tape and getting them out from under the plastic.

  23. Remove ribbon cable connected to the motherboard.
    • Remove ribbon cable connected to the motherboard.

    • Before removing ribbon pry the small white tab that seats the ribbon.

  24. Disconnect plastic port.
    • Disconnect plastic port.

  25. Remove black tape near the edge of the motherboard.
    • Remove black tape near the edge of the motherboard.

  26. The motherboard can now be lifted up easily, if any snagging occurs make sure everything was disconnected properly before continuing.
    • The motherboard can now be lifted up easily, if any snagging occurs make sure everything was disconnected properly before continuing.

    • When reassembly ensure nothing is stuck under the motherboard.

    There is a ribbon cable under the board you will need to disconnect as well.

    Dustin - Responder

    And in which part the BIOS is configured?

    Albert - Responder

Conclusão

To reassemble your device, follow these instructions in reverse order.

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Ashley Williams

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4 comentários

thanks a lot for this good article ... could you please advice where to buy the replacement motherboard online ?

many thanks again

Siyamand Rashid - Responder

Alibaba or AliExpress is cheaper than eBay or Amazon but if in USA then buy from

Baba Callum -

Does someone know if we can replace a 745 g2 motherboard by another model like a 820 g2 or something like this ? Tks.

Rusterholtz - Responder

745 G2 can only be replaced with 840 G2.

While 725 G2 can only be replaced by 820 G2

Baba Callum -

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