As a customer, I would never accept the discolored boards, even if the function is allright. Would you buy a car with matte paint? Hardly. If you can give the customer ordinary guarantee, and he accepts that, it might work, however. Inge -------------------------------------------------- From: "Steve Gregory" <[log in to unmask]> Sent: den 30 July 2010 03:34 To: <[log in to unmask]> Subject: Re: [TN] PCB Discoloration > Hi Linda! > > While discoloration in itself is not a defect, I would be a little worried > about these seven boards. Especially since the rest of the lot are not > discolored like this: > > > http://stevezeva.homestead.com/PCB_Discoloration1.jpg > > > > I don't see any delamination in the photos, but it sure looks like the > boards got pretty toasty. I wonder if it was because the boards were > sitting over a preheater or hot plate too long. From the looks of the > components on the board, most of it was probably hand soldered (those PTH > caps converted to SMT couldn't have taken reflow), and I imagine that the > solid plane on on the backside of the board was a real heatsink. > Preheating the board would have helped with soldering the PEM nuts for > sure, but maybe the preheater was set too high. I know a Hakko IR > preheater can smoke a board if you're not careful (not that I've ever done > that, but I know a friend of a friend who did. Hehehehe). > > > > Anyways, those seven boards saw more heat than the rest of them did based > on the appearance in the photos. I don't think I'd buy off on them... > > > > Steve > > > > > > > > From: Linda Langley [mailto:[log in to unmask]] > Sent: Thursday, July 29, 2010 1:42 PM > To: Steve Gregory > Subject: FW: PCB Discoloration > > > > Hi Steve, > > > > Here I go again asking for help from my experts! Can you please post these > pictures? So I don¡¯t have to bother the whole forum, would you know the > name of the board guru that could answer my questions? > > > > I am not sure if the discoloration is a defect, is this a form of > delaminating? Why would only seven boards turn this color? They are all > from the same lot. > > > > Any information will be greatly appreciated. > > > > > Linda Langley CIT > > Training Specialist > > Jabil Circuit > > 248-292-6176 > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] or > 847-615-7100 ext.2815 > ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------