Electronics Forum: discoloring (Page 1 of 12)

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

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

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

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!

discolored pbfree finish after bake and/or reflow

Electronics Forum | Fri Apr 21 09:03:59 EDT 2006 | choppy

I guess the first thing to look at is the temperature. We had to heat more for QFP256 on sample boards and we saw discoloration on some small parts. Just try to sense around when profiling to see what's there.

White Solder Mask Discolored after Reflow Oven

Electronics Forum | Sat Aug 15 06:29:40 EDT 2009 | abeasia

Help, experiencing discolor of a white solder resist paint after reflow of 250 degree, it turned yellow. Have tried many paints, no luck. Anyone knows one that wouldn't change color and holds the white nicely? Thanks for your support in advance.

Disposition on Discoloration of Boards post reflow

Electronics Forum | Mon Dec 30 10:22:58 EST 2013 | davef

A-610E, 10.7.4 covers solder mask discoloration. Use that for your disposition

Disposition on Discoloration of Boards post reflow

Electronics Forum | Thu Dec 26 08:40:21 EST 2013 | vileo72

Hi , During one of NPI trial ,we found that boards ( CEM -1 grade )has got discolored on the masking portion ( and not on the conductors) after reflow .Although it does not impact our Form /Fit and Function characteristics , I would like to get your

Re: Gold Fingers Discoloration

Electronics Forum | Thu Jul 06 20:10:06 EDT 2000 | Dave F

I agree. Make them quit doing this ugly thing to your boards!!!

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