Electronics Forum: pcb touchup (Page 1 of 2)

Gold finger touch-up paint

Electronics Forum | Tue Oct 26 12:18:53 EDT 1999 | Gary Kemp

We are having a discolorization problem with the gold fingers on our PCB's. I have been made aware that there is a gold touch-up paint (masking) that is available. Would anyone know where I can get my hands on some of it? Any help would be appreci

QFN soldering

Electronics Forum | Fri Apr 06 11:10:43 EDT 2012 | cadco

We are a PCB design house/CM and we have found that if you elongate the QFN pads to the outside of the part by .025 to .030 you then have the opportunity of doing touch-up manually with a soldering iron should there be a voiding issue. This would hav

BGA rework with unplugged vias PCB

Electronics Forum | Thu Dec 07 14:19:07 EST 2006 | russ

You have two options 1. Get some real solder mask form board supplier (not touchup pens) and repaint the trace and heat cure. 2. Fill the via with solder before reflowing new part, this usually works but sometimes it doesn't. We use Method 1 Russ

Coating Brush Touch-up

Electronics Forum | Thu Dec 04 12:24:35 EST 2008 | jdumont

We have the same Asymtek machine, same Humiseal product, same bubbling issue on touch ups. Ive found that very light pressure and a thinner mixture usually yields good results for us. Generally I dip the brush in the mixture and let it drip near wher


Electronics Forum | Tue Jul 06 10:08:20 EDT 2010 | swag

Thanks - we have tried everything you can imagine with machine settings as well as burnishing and flatening fids with irons. I don't want to deal with it in house. The volumes are huge and we don't want to do any touch-ups. I am really looking for

Re: Via in the middle of a pad

Electronics Forum | Tue Jan 04 08:40:24 EST 2000 | g cronin

don't you just love those design guys sometimes, this is an issue that pops up every once in a while with us too. We have a couple assemblies that have hundreds of vias on pads. We have tried and had some sucess with: increasing squeegee pressure,

Cleaning Water Soluble Flux After Touch-up

Electronics Forum | Thu Aug 26 21:54:57 EDT 2004 | KEN

I ran into this about 2 years ago. The Rework Operators (all 3 shifts) would rework a device, rince the board with tap water (yep, 50k / Cm^3) from a nearby sink, then send the PCB to test (which is really ironic as they had to walk past the DI wash

Touch-up and inspection of visual defects

Electronics Forum | Mon Apr 25 11:24:31 EDT 2005 | Daan Terstegge

I have a question about inspection, touch-up, and how far you need to go to get a product that meets the required IPC-spec. According to some reports (i.e. "New Study Reveals Component Defect Levels" by Stig Oresjo of Agilent) the average defect leve

reworking brds by flowing the board thru' oven for the 3rd times

Electronics Forum | Mon Mar 19 00:14:44 EST 2001 | zam_bri

Our process mostly are double sided reflow and we are using water soluble paste on ENTEK PCB. Rework WIP has been accumulated since the last 4 months, and upon clearing, one of the method that the test guy use are to reflow the PCB again for one mo

Clean vs No Clean PCB assembly process

Electronics Forum | Thu Jul 26 22:52:47 EDT 2001 | davef

GT 8 years ago every board saw "touchup". Touch was done to fix boards to conform to A-610. Now A-610 allows less than complete hole fill. Our operators were totally freaking nuts about touching boards. They touched each others touch and on and o

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