nvidia Geforce 9800 gt doesnt work

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  • jonny0404
    Senior Member
    • Nov 2014
    • 116
    • Colombia
    #1

    nvidia Geforce 9800 gt doesnt work

    hi guys i have a nvidia Geforce 9800 gt , when i press power button video card doesnt work, i mean fan doesnt spin, nothing happen, no video...can someone be kind of helping me fix these card...i already did a reflow nothing happen...where can i measure to know the problem..thanks....power supply atx is working good, the problem is on the video card..
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    • mockingbird
      Badcaps Legend
      • Dec 2008
      • 5484
      • -
      #2
      Re: nvidia Geforce 9800 gt doesnt work

      Your re-flow wasn't hot enough...

      If it was, that brown electrolytic capacitor in the bottom right corner would have bulged (That is almost certainly a Chemi-Con KZG series, which should be replaced).

      If you MUST use this card and are adamant about fixing it, then I suggest trying to re-flow it again, but this time squirt some liquid flux under the GPU BGA before you do, desolder that electrolytic cap, and re-flow it at the proper temperatures, following proper procedure.

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        • jonny0404
          Senior Member
          • Nov 2014
          • 116
          • Colombia
          #3
          Re: nvidia Geforce 9800 gt doesnt work

          thanks friend, proper temperature would be 200 C would be ok, what do you think??

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            • drag
              Member
              • May 2016
              • 18
              • finland
              #4
              Re: nvidia Geforce 9800 gt doesnt work

              385f or 196 Celsius about 6-8 minutes. 8800 ultra works fine now, I put it to oven 200 C
              about 7-8 min.
              Sorry for my bad english.

                Comment

                • chowder
                  Member
                  • Feb 2016
                  • 44
                  • UK
                  #5
                  Re: nvidia Geforce 9800 gt doesnt work

                  The fan not spinning would suggest the card or fan (or both) are not getting any power. Reflowing won't fix that.

                    Comment

                    • momaka
                      master hoarder
                      • May 2008
                      • 12175
                      • Bulgaria
                      #6
                      Re: nvidia Geforce 9800 gt doesnt work

                      Originally posted by jonny0404
                      thanks friend, proper temperature would be 200 C would be ok, what do you think??
                      No, proper temperature would be 225-235C. Ideally, when the temperature of the video card reaches 225-235C, it should stay like that for no more than 10-20 seconds. Then you turn the oven off and open the door *a little bit* to let out the heat and cool the card slowly.

                      Originally posted by drag
                      385f or 196 Celsius about 6-8 minutes.
                      Lead-free solder melts at 217 Celsius, so you need at least that much for a proper reflow.

                      Your 8800 Ultra likely got fixed because ovens are not 100% accurate with their temperature - they can over- and/or under-shoot by 5-15C.
                      Last edited by momaka; 05-21-2016, 09:01 PM.

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