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Subject:	Re: HDSP-2502 Smart Display through hole Solder Joints Failing
From:	Steve Herring <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Steve Herring <[log in to unmask]>
Date:	Fri, 22 Mar 2019 19:24:29 +0000
Content-Type:	text/plain
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Steve,



No info on the LCD was included in your email.



Is it possible the Display is under compression when the pcba is mounted into place in its final home?



Steve



Steven E Herring

Director of Engineering

Pennatronics Corp



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory

Sent: Friday, March 22, 2019 3:11 PM

To: [log in to unmask]

Subject: [TN] HDSP-2502 Smart Display through hole Solder Joints Failing



Hi All,



This just a shot in the dark, but have any of you used this display in a board that experiences vibration and have the solder joints fail?



We have a board that we're building using leaded solder, and use a selective solder to solder it into the board. We electrically test it here before we ship it. It goes out in the field and then the display will stop working at some point. We've gotten the boards back, and discovered that it usually is a cracked solder joint. In fact, you can pull the display completely out of the board, the leads pull out of the solder joints. None of the other through hole components have any issues, and there's quite a few other through hole components on the board.



The leads are very stiff, they are some sort of copper alloy I think.

Olin194, does that sound right? I've had a hard time finding what they are actually made from, or what the lead finish is. Supposedly they are ROHS compliant. They've changed names a few times, started out as Agilent, then Avago, now Broadcom.



Like I said this is a shot in the dark...



Thanks,



Steve



--

Steve Gregory

Kimco Design and Manufacturing

Process Engineer

(208) 322-0500 Ext. -3133



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