Hi, The solder joints are indeed bad. But this is 'normal' however, I have seen it in several TV's. It is difficult to have a soldering process that solders both big and small parts. But can also be due to bad mounting without thermal stress relief: there is an example on my homepage at http://www.hoeben.com follw the 'soldering' link.
And about the gassing: that is probably WATER. A pcb always contains moisture, several % (even iron does so: just weld it and you will see). When you solder it, the water boils. This is why board are always kept in a dry place/oven before soldering. Regards, Pieter Hoeben Date sent: Fri, 14 Nov 2003 08:39:20 -0800 To: Multiple recipients of list CHIPDIR-L <CHIPDIR- [EMAIL PROTECTED]> Send reply to: [EMAIL PROTECTED] Organization: Fat City Network Services, San Diego, California > Don't worry to much, brazilian electronics are generally a mess, > amateur level in Europe is a lot more professional, > I can tell because I have seen a lot, had to repair a lot of this stuff, > if I didn't need too, I wouldn't touch it, the chinese products are > 50 years ahead. They can do it and keep up with it, because > their home market is so big and strong. > > This is just my private opinion. > > Friedel > > At 07:14 14/11/03 -0800, you wrote: > >On Fri, Nov 14, 2003 at 04:44:21AM -0800, Alexandre Souza enlightened us > >thusly > > > > I have basically no manufacturing experience, I should say. The > > > > board had a soldering problem - poor preheating. Small stuff was > > > > soldered OK, but (a lot of) physically large parts were underheated, > > > > and soldering was poor. Ditto for the earth line, and thick tracks. > > > > So far so good. When I reheated these joints, they started > > > > bubbling, and continued bubbling. They would spit solder away on > > > > occasion. I had to be careful not to overheat compontents, But this > > > > would continue for 30 secs on a pin, and I gave up before it did. > > > > Certainly more than flux. What's going on?? Implications?? > > > > > > Seems poor soldering/poor quality solder. There is no best > > > solution than suck the old solder and apply new solder. This is a > > > very common problem in Brazil with computer monitors made by TCE > > > here. > > > > > > http://www.pinball-taito.com.br/amiga/howtofix.htm will show you > > > some examples of "good" TCE soldering job ;o) > > > >Fine pics. Silly commentary, and it's a PITA the guy only has a 300 baud > >modem! The loading was _that_ slow. > > > >I was wondering was the board gassing. Surely not 30 secs from the > >solder. All that messing stops when it gets up to temprature, doesn't > >it? > > > > > > > > > > Greetings from Brazil! > > > >Greetings from Ireland. BTW, I get a lot of spam from Brazil. It all > >hides behind apnic.net, who have the IPs and give them out to various > >isps, I gather. > > > >I can run 'whois' under linux on an IP and usually get the registered > >name. But they're all registered to apnic.net. Apnic just say "F*** > >off and search with our website!" The website reveals nothing. Are you > >in a good position to uncover those? > > > >-- > > > > With best Regards, > > > > > > Declan Moriarty. > >-- > >Author: Declan Moriarty > > INET: [EMAIL PROTECTED] > > > >Fat City Network Services -- 858-538-5051 http://www.fatcity.com > >San Diego, California -- Mailing list and web hosting services > >--------------------------------------------------------------------- > >To REMOVE yourself from this mailing list, send an E-Mail message > >to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > >the message BODY, include a line containing: UNSUB CHIPDIR-L > >(or the name of mailing list you want to be removed from). You may > >also send the HELP command for other information (like subscribing). > > -- > Author: Friedel Bruening > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > > ====================================================== ========== > Deze e-mail is door E-mail VirusScanner van Planet Internet gecontroleerd op virussen. > Op http://www.planet.nl/evs staat een verwijzing naar de actuele lijst waar op wordt gecontroleerd. ______________________________________________ Hoeben Electronics Phone: +31 6 51590081 Ronkert 44 Fax: +31 13 5096025 5094 EW Lage Mierde Private: +31 13 5096200 The Netherlands E-mail: [EMAIL PROTECTED] http://www.hoeben.com ______________________________________________ -- Author: Pieter Hoeben INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
