Electronics Forum: discoloration (Page 1 of 12)

GF discoloration

Electronics Forum | Tue Feb 22 10:17:11 EST 2011 | huei23

Hi everyone, Our FA team recieved the defect unit from our customer, and the issue is GF discoloration. EDX was conducted and Na element was detected on the discolored area. We're currently working with the customer to determine the rootcause. Pleas

Non-conductive epoxy discoloration

Electronics Forum | Thu Feb 26 21:35:21 EST 2015 | flyingsnow

Hi, has anyone experienced discoloration of cured non-conductive epoxy? It turned from white to deep red. The parts were returned from customer and we noticed the color change and wondered what could cause epoxy discoloration.Thank you!

Solder mask discoloration

Electronics Forum | Wed Aug 17 13:57:27 EDT 2005 | ppwlee

We have encountered what appears to be mask discoloration after wave soldering. The areas of concern coincide with the areas that were exposed selectively by fixtures during wave soldering, dominated by one date code of PCB with a slightly different

Solder mask discoloration

Electronics Forum | Wed Aug 17 14:30:58 EDT 2005 | russ

I usually see this with mask that is not fully cured from the PCB shop. This probably agrees with the baking statement that you made.

Solder mask discoloration

Electronics Forum | Wed Aug 17 22:41:37 EDT 2005 | davef

Peter are you having fun with solder masks erwat? We saw this years ago with LPI solder masks. It shows occasionally with other masks. We agree with Russ. If nothing [eg, alcohol, flux thinner, acetonitrile, or water] dissolves the haze, then it

Tin leaching / lead terminal discoloration on Pb-free

Electronics Forum | Thu Jul 27 07:50:35 EDT 2006 | davef

Send us pix

Tin leaching / lead terminal discoloration on Pb-free

Electronics Forum | Mon Jul 24 11:35:42 EDT 2006 | Jimk@ics-inc.org

We have experienced a problem with tin leaching or discoloration of lead terminals on random parts on solder side of a paste/paste operation. The profile has been used on previous production runs and there doesn't appear to be any heat damage to othe

Conformal Coating Discoloration

Electronics Forum | Mon Aug 29 16:21:20 EDT 2011 | rjlasko

Greetings...I have a customer that has an assembly that is conformal coated with Humiseal 1A33. This assembly has some components (resistors and FET's) that heated up during operation and has discolored the conformal coating around their location.

Gold Fingers Discoloration

Electronics Forum | Mon Jul 03 23:11:04 EDT 2000 | Patrick Ng

hi, We are receiving PCBs with gold fingers "discolored". The "discolored" gold fingers can be removed if rub with soft eraser! We are working with suppliers to determine the root cause and eliminate this issue. Pls assist if you have encountered si

Conformal Coating Discoloration

Electronics Forum | Tue Aug 30 09:49:24 EDT 2011 | blnorman

Guess the better question is why are the resistors and FETs heating to the degree that they discolored the coating? If the coating is discolored, I'd be concerned with the possibility of cracking as dave mentioned. Cracks defeat the purpose of the

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