Clevo X8100 startup problem

Discussion in 'Sager/Clevo Reviews & Owners' Lounges' started by SimoDj84, Dec 14, 2017.

  1. Bratzi

    Bratzi Newbie

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    Thanks Meaker, after reading your comment I gave it another try today and realised what was (probably) the reason for the single-card no video issue: The previous owner of that X8100 had switched the position of the two cards at some point. The X8100 has its MXM slots labelled "master" and "slave", but the card in the slave slot was probably originally the master card (the crossfire cable end on the master slot, as well as the crossfire socket of the card that was installed in the slave slot had some minor residue on them, probably because they were initially secured with a sticker or piece of tape).

    With the right master card installed in the master slot video output worked again. Since the random shutdowns persist I guess it is the NEC-Tokin then.
     
  2. Meaker@Sager

    Meaker@Sager Company Representative

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    Did you try leaving the slave card out?
     
  3. Bratzi

    Bratzi Newbie

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    Yes, I left the slave card out. On my first test I accidently tried to use the Slave card in the Master socket (since I didn't notice that the previous owner had switched the two cards for some reason - master card was in slave socket, slave card in master socket, but video worked fine). So single-card video works, but the shutdowns remain. So I'm pretty convinced right now, that both graphic cards are working and it's the NEC Tokin I need to replace. So I wanna assemble a list of things I'll need for that.

    Senso recommended 330uF 2.5V Capacitors with an ESR of 25m Ohm
    https://www.ebay.co.uk/itm/4x-SMD-T...597050?hash=item362b5aadfa:g:JKwAAOSwAKxWXfB4

    While Randomrat used 330uF 10V Capacitors with an ESR of 6 mOhm
    https://eu.mouser.com/ProductDetail/KEMET/T530X337M010ATE006?qs=AaRlLUpeMsw53NLKZ0%2bwLQ==

    The original NEC Tokin 0D108 seems to have been a 1000 uF 2V Capactor with an ESR of 1 mOhm according to this site:
    http://www.lizbit.pt/store/nec-tokin/462-nec-tokin-od108.html

    I'm no expert in electronics, but from what I found on the web the voltage stated on the capacitors specs doesn't matter too much, as long as it's higher than the original 2V (since it's more like a max voltage the cap can handle if i understood that correctly, so anything in the 2V-10V range is probably ok?). But what about ESR? And will 105°C max operating temperature be fine or is 125°C required?

    Other than the capacitors I'll get some desoldering wick and flux to remove the solder of the NEC Tokin and rubbing alcohol and pads to clean up the PCB afterwards. I already got a 15W Iron, a heat gun, tweezers as well as an exacto knife and prying tool.

    What method is safer to do? Heating the NEC Tokin with the heatgun until you can remove it with tweezers or prying off the chip?
    @randomrat Which method did you use?
     
  4. senso

    senso Notebook Consultant

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    The eBay ones work OK in core2duo based laptops, but it seems like the Clevo due to its beefier CPU needs the lower ESR caps, if you are buying from Mouser, I would grab the lowest ESR 470uF caps that there are available.

    For removing the NEC-Tokin cap, my go to trick is to remove the plastic cover(easy to do, stab it in the middle with tweezers or screwdriver and the rest comes of easy).

    Then, flux all around it, heat gun at 300ºC for 2 minutes, doing circular motions around the NEC, and with a hot iron, touch the solder that is around the NEC-Tokin, when it moves, grab it with a tweezer and its done.

    Then, solder the new caps.
     
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  5. Bratzi

    Bratzi Newbie

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    The lowest ESR ones on Mouser are 4 mOhm, but at 33,70€ for 5 pcs they seemed rather expensive, when the cheapest 5 mOhm ones are 13,05€ for 5 pcs. But when I wanted to buy them I saw that Mouser adds 20€ shipping cost for Germany, unfortunately.


    Would any of these work too? If so, which one would you recommend to buy?

    470uF, 2.5V, 6 mOhm ESR, 7343 Case, 105°C max (Part number T520V477M2R5ATE006) - 8,20€ + 3,52€ Shipping for 5pcs - https://www.ebay.de/itm/272967417294

    470uF, 2.5V, 9 mOhm ESR, 7343 Case, 105°C max (Part number 2R5TPE470M9) - 5,44€ + 3,52€ Shipping for 5pcs - https://www.ebay.de/itm/273167850329

    470uF, 6.3V, 8 mOhm ESR, 7343 Case, 105°C max (Part number 6TPB470M) - 8,46€ + 3,52€ Shipping for 5pcs - https://www.ebay.de/itm/273151851458
    (Edit: Just realized the last one was 0,08 Ohm = 80 mOhm and not 0,008 Ohm. My bad.)

    Also thank you a lot for sharing your desoldering tips! I'll use this method too then.
     
    Last edited: May 17, 2018
  6. senso

    senso Notebook Consultant

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    If you are in Europe, try RS and Farnell, as well as Conrad(German company), and TME.

    Mouser shipping is free above 50€, but given that you dont need 50€ of components its a useless perk for you, all other companies are located in the EU.

    10mOhm ESR:

    https://www.conrad.de/de/tantal-kon...c-6tpf470mah-1-st-1179782.html#downloadcenter

    Or the exact part number of your third link:

    https://www.conrad.de/de/tantal-kon...-x-43-mm-panasonic-6tpb470m-1-st-1179768.html

    I would settle for one of those, they are higher capacity and the ESR is in the same ballpark, 1-2mOhm can be easily lost/gained by how well/bad they are soldered.
     
  7. Bratzi

    Bratzi Newbie

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    Alright, I ordered the parts as well as some flux, solderwick, isopropylalcohol and cleanroom wipes. Thanks a lot for the help, Senso.

    I'll post an update with pictures of the process once all the parts arrived and I get to attempt the repair.
     
  8. senso

    senso Notebook Consultant

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    Any doubt, ask before doing.
     
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