crossfire vr4000

timwebb · 7th February 2012, 02:05 AM

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.

brandes.cm · 7th February 2012, 02:40 AM

I would suggest pulling the parts from the board to measure, just to make sure something else isn't in parallel with them.

timwebb · 7th February 2012, 02:46 AM

yea i just pulled the 4 big ones and they are shorted across.

brandes.cm · 7th February 2012, 02:58 AM

Dead short or really low reading?

timwebb · 7th February 2012, 03:02 AM

its a dead short. ive never seen a diode like that before.

brandes.cm · 7th February 2012, 03:08 AM

Is there any part # on the case for any of them, It could just be very light in color.

timwebb · 7th February 2012, 03:20 AM

they are all blank.

timwebb · 7th February 2012, 12:26 PM

From what I've read these should be 6.2v zener diodes. Is this correct?

brandes.cm · 7th February 2012, 12:56 PM

SMD marking codes

Under MELF diode markings.

brandes.cm · 7th February 2012, 01:06 PM

Maybe a Vishay TGL41-XX, The XX would be the voltage rating.

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7th February 2012, 02:40 AM	#2
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	I would suggest pulling the parts from the board to measure, just to make sure something else isn't in parallel with them.

7th February 2012, 02:46 AM	#3
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	yea i just pulled the 4 big ones and they are shorted across.

7th February 2012, 02:58 AM	#4
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Dead short or really low reading?

7th February 2012, 03:02 AM	#5
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	its a dead short. ive never seen a diode like that before.

7th February 2012, 03:08 AM	#6
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Is there any part # on the case for any of them, It could just be very light in color.

7th February 2012, 03:20 AM	#7
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	they are all blank.

7th February 2012, 12:26 PM	#8
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	From what I've read these should be 6.2v zener diodes. Is this correct?

7th February 2012, 12:56 PM	#9
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	SMD marking codes Under MELF diode markings.

7th February 2012, 01:06 PM	#10
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Maybe a Vishay TGL41-XX, The XX would be the voltage rating.

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