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thrustmaster t300rs wheel dead no power

Discussion in 'Troubleshooting and Repair' started by mohanad, Dec 3, 2016.

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  1. mohanad

    mohanad

    12
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    Dec 3, 2016
    hi
    i have a thrustmaster t300rs ffb wheel for pc i had it for 6 months and all of a sudden it died with no power at all
    i cracked it open and found that the internal power supply is giving (30 volts) instead of (25 volts).
    i replaced it with a laptop power supply with 25volts and 2amps max but still not getting any power and the power light is off.what component might be burnt ?
     

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  2. Alec_t

    Alec_t

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    Welcome to EP!
    Looks to me like the negative terminal of that big 2220uF cap hanging off the board has a dry joint with the board, with charring around it and the adjacent black connecting wire. Also, the big electrolytic (C88?) at bottom left seems to have leaked/cooked (or is that just shadow?).
     
    Last edited: Dec 3, 2016
  3. davenn

    davenn Moderator

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    Sep 5, 2009
    I see that regularly on boards ... it appears to be well soldered on the other side

    That ground wire joint does need checking



    looks like lots of solder flux

    @mohanad please show a better photo of around that cap mounted to the side of the board
    and BOTH sides of the board


    chances are that the fault is elsewhere
     
  4. mohanad

    mohanad

    12
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    Dec 3, 2016
    t
    thank you for the reply,i have high res photos of the board but when uploaded it gets compressed,how to get around that ?
     
  5. mohanad

    mohanad

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    Dec 3, 2016
    thank you,i will take close ups og that section,do you know how to upload high res photos this site compress it to a small size?
     
  6. davenn

    davenn Moderator

    13,576
    1,866
    Sep 5, 2009
    just do closer in images but make sure you keep your focus
    the resolution u used on the other pix isn't a problem

    programs like IrfanView are great for simple resizing and compressing image files
     
  7. mohanad

    mohanad

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    Dec 3, 2016
    1 1.jpg 1 2.jpg 2 1.jpg
     

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  8. mohanad

    mohanad

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    Dec 3, 2016
    are these good ?
     
  9. davenn

    davenn Moderator

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    1,866
    Sep 5, 2009
    great quality but wrong end of the board ;)
    want to see both sides of the board of that top right section where that capacitor is bent over to the side of the board
     
  10. mohanad

    mohanad

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    Dec 3, 2016
    here you go

    i posted 5 photos no.3 is the other side
     

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  11. davenn

    davenn Moderator

    13,576
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    sorry, I missed that, the pix in the thread were of the other end LOL

    it all looks good

    so the real problem is ... what has failed ???
    can you indicate where you were measuring that 30V and how you think it is supposed to be 25V ?
     
  12. mohanad

    mohanad

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    Dec 3, 2016
    it has an internal power supply written on it output:25 volts and 2 amps when checked with the voltimeter it says 30 volts
     
  13. mohanad

    mohanad

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    Dec 3, 2016
    do you see the plug with the 4 pins,this is where the power supply goes,when connected to the pc the usb sends 5 volts through this plug which goes to the power supply which activates a switch on it (triac) which make the current pass through to the board and the wheel powers on
     
  14. davenn

    davenn Moderator

    13,576
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    Sep 5, 2009
    in this pic of yours I see a little solder tail going off to the side .... see the red arrow
    probably not a problem as it probably hasn't penetrated the PCB coating, but gently scrape it off anyway

    2 1.jpg
     
  15. davenn

    davenn Moderator

    13,576
    1,866
    Sep 5, 2009
    ummm OK

    a higher voltage ( open circuit voltage) tends to indicate that it is not being loaded down by the circuit it supplies

    The other thing it could be is that the PSU itself has failed and is just putting out unregulated voltage

    sooooooo show us the PSU
     
  16. mohanad

    mohanad

    12
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    Dec 3, 2016
    as i told you i used i laptop psu with 25v and 2amps and hoocked it directly to the board through the 4 pin connector (only used two pins) still i get no power
     

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  17. davenn

    davenn Moderator

    13,576
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    Sep 5, 2009
    OK so the PSU is unregulated, it could quite easily show 30V when it's not under load

    on this section with the PSU socket .... 1 and 2, which is the 25V pin and which is the control pin ....

    33.jpg
     
  18. davenn

    davenn Moderator

    13,576
    1,866
    Sep 5, 2009
    trying to go beyond those first few components without a service manual or at minimum a schematic is going to make a repair somewhere between difficult and impossible
     
    Last edited: Dec 4, 2016
  19. mohanad

    mohanad

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    Dec 3, 2016
    1 and 2 are the control pins the other two are for 25v,too bad i thought it was fixable i have two of these and both are broken,thank you for your help
     
  20. mohanad

    mohanad

    12
    1
    Dec 3, 2016
    Can we say it is normal to have a higher viltage under no load condition ? if this is the case then may be one of the caps is bad ?
    Whats happens if a cap is bad ?does cut or break the circuit ?
     
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