Solder Open/Mild Tombstone on 1206 LED

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Mild tombstoning on 1206 Kingbright LED. Has anyone seen th... - Aug 21, 2008 by David L.

The blower for zone 6 bottom is turning 46.725 RPM's too fas... - Aug 21, 2008 by Sr. Tech

yes I have seen that same problem several years ago we did... - Aug 21, 2008 by WRONGWAY

We had the same problem, same brand part. We were running 3 ... - Aug 21, 2008 by Doug Philbrick

David L.

#56091

Solder Open/Mild Tombstone on 1206 LED | 21 August, 2008

Mild tombstoning on 1206 Kingbright LED. Has anyone seen this problem and have any suggestions in root cause?

Please see attachment for more detail

Attachments:

2008-08-18 LED with Mild Tombstone.doc

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Sr. Tech

#56093

Solder Open/Mild Tombstone on 1206 LED | 21 August, 2008

The blower for zone 6 bottom is turning 46.725 RPM's too fast.

While we are waiting on some of the other pro's to confirm my diagnosis, you may want to check the forum archives for "tombstone".

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WRONGWAY

#56094

Solder Open/Mild Tombstone on 1206 LED | 21 August, 2008

yes I have seen that same problem several years ago we didn't change anything the problem went away when we used a differant date code from the same vendor I just figured it was comtaminated leads

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Paul M.

#56096

Solder Open/Mild Tombstone on 1206 LED | 21 August, 2008

I have had a similar problem as this. But, not on that particular type of component.

Have your machine place the component, take the PCB over to a microscope and look at the part how it sit's on and in the paste on the pads. You might see that one side of the component is set deeper in the paste on one pad then the other pad.

Having said that. It was a bent tool that placed that part not evenly in the paste on the pads. One side of the component was deeper into the paste compared to the other side. Replaced the tool and BINGO. Problem solved.

Good luck.

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Doug Philbrick

#56100

Solder Open/Mild Tombstone on 1206 LED | 21 August, 2008

We had the same problem, same brand part. We were running 3 different flavors only had the issue with one reel. Swaped out that reel for another and the problem went away.

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