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Old 7th February 2012, 02:05 AM   #1
timwebb is offline timwebb  United States
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Default crossfire vr4000

ok i finally got another driver card. after some testing all the diodes on both driver cards are bad. they have a direct short across them i need some help to identify these parts.
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Old 7th February 2012, 02:40 AM   #2
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I would suggest pulling the parts from the board to measure, just to make sure something else isn't in parallel with them.
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Old 7th February 2012, 02:46 AM   #3
timwebb is offline timwebb  United States
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yea i just pulled the 4 big ones and they are shorted across.
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Old 7th February 2012, 02:58 AM   #4
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Dead short or really low reading?
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Old 7th February 2012, 03:02 AM   #5
timwebb is offline timwebb  United States
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its a dead short. ive never seen a diode like that before.
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Old 7th February 2012, 03:08 AM   #6
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Is there any part # on the case for any of them, It could just be very light in color.
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Old 7th February 2012, 03:20 AM   #7
timwebb is offline timwebb  United States
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they are all blank.
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Old 7th February 2012, 12:26 PM   #8
timwebb is offline timwebb  United States
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From what I've read these should be 6.2v zener diodes. Is this correct?
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Old 7th February 2012, 12:56 PM   #9
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SMD marking codes

Under MELF diode markings.
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Old 7th February 2012, 01:06 PM   #10
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Maybe a Vishay TGL41-XX, The XX would be the voltage rating.
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