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#155614 - 16/04/2003 08:50 chip P98AB LVX4245 - possible solder issue?
Phoenix42
veteran

Registered: 21/03/2002
Posts: 1424
Loc: MA but Irish born
I brought my empeg into work today to have a possible dry solder join fixed up - hey they have some fun tools here, might as well make use of them.
Anyways the guy that did the soldering had a look around the board and found a solder joint connecting two of the legs on this chip. See pic one, and a zoom in pic two.
Is this an issue or by design?

edit: sorry for the hugh pics, limited photo SW on work PCs.

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#155615 - 16/04/2003 08:50 Re: chip P98AB LVX4245 - possible solder issue? [Re: Phoenix42]
Phoenix42
veteran

Registered: 21/03/2002
Posts: 1424
Loc: MA but Irish born
Pic 1


Attachments
153677-problem.jpg (292 downloads)


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#155616 - 16/04/2003 08:51 Re: chip P98AB LVX4245 - possible solder issue? [Re: Phoenix42]
Phoenix42
veteran

Registered: 21/03/2002
Posts: 1424
Loc: MA but Irish born
Pic 2, zoom.


Attachments
153679-zoom.jpg (176 downloads)


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#155617 - 16/04/2003 09:03 Re: chip P98AB LVX4245 - possible solder issue? [Re: Phoenix42]
maczrool
pooh-bah

Registered: 13/01/2002
Posts: 1649
Loc: Louisiana, USA
Let me look at my high rez pics of the board and see if it is there on mine too. Where exactly is that chip on the board? If it's on the display board, I don't have it.

Stu


Edited by maczrool (16/04/2003 09:12)
_________________________
If you want it to break, buy Sony!

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#155618 - 16/04/2003 09:15 Re: chip P98AB LVX4245 - possible solder issue? [Re: Phoenix42]
tman
carpal tunnel

Registered: 24/12/2001
Posts: 5528
Ignore it. Not sure if the solder bridge is intentional or not but they should be connected together.
The two pins are for power according to my datasheet CDROM. Look here for an online copy.

- Trevor

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#155619 - 16/04/2003 09:16 Re: chip P98AB LVX4245 - possible solder issue? [Re: tman]
maczrool
pooh-bah

Registered: 13/01/2002
Posts: 1649
Loc: Louisiana, USA
Good thinking.

Stu
_________________________
If you want it to break, buy Sony!

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#155620 - 16/04/2003 09:33 Re: chip P98AB LVX4245 - possible solder issue? [Re: tman]
Phoenix42
veteran

Registered: 21/03/2002
Posts: 1424
Loc: MA but Irish born
thanks tman

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#155621 - 16/04/2003 16:49 Re: chip P98AB LVX4245 - possible solder issue? [Re: tman]
Shonky
pooh-bah

Registered: 12/01/2002
Posts: 2009
Loc: Brisbane, Australia
Unlikely it is intentional. What happens is that there is a track running directly underneath between the two pins. When the board goes through the reflow oven, the solder paste easily bridges between the two pins since they are at exactly the same temp (I think thats the reason). For this exact reason we have started routing tracks like this either under the chip or outside the pins to prevent this sort of false alarm at board inspection time.
_________________________
Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)

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#155622 - 16/04/2003 16:54 Re: chip P98AB LVX4245 - possible solder issue? [Re: Shonky]
tman
carpal tunnel

Registered: 24/12/2001
Posts: 5528
Yeah. I didn't think it was intentional.
Bit strange that the outer most pin is bent slightly though.

- Trevor

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#155623 - 17/04/2003 02:28 Re: chip P98AB LVX4245 - possible solder issue? [Re: tman]
simspos
enthusiast

Registered: 28/03/2002
Posts: 230
Loc: Dudley, UK
Bit strange that the outer most pin is bent slightly though
Yeah!, I'd hate to have that job on the assembly line

"and what do you do for a living"
"Well, there's this this itsy bitsy pin on a chip..........

Cheers, Sim

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#155624 - 17/04/2003 17:13 Re: chip P98AB LVX4245 - possible solder issue? [Re: Shonky]
rob
carpal tunnel

Registered: 21/05/1999
Posts: 5335
Loc: Cambridge UK
We had a bed of nails test rig so that sort of anomoly didn't cause any confusion.

I wish we still had that thing - it was a work of art.

Rob

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#155625 - 17/04/2003 18:14 Re: chip P98AB LVX4245 - possible solder issue? [Re: rob]
Shonky
pooh-bah

Registered: 12/01/2002
Posts: 2009
Loc: Brisbane, Australia
Yeah, we use beds of nails for our stuff too. But there is still some amount of visual inspection before that.
_________________________
Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)

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