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 Post subject: TROUBLE SHOOTING BAD JOINTS CIRCUIT BOARDS
PostPosted: Jan Fri 18, 2019 8:11 pm 
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Joined: Mar Mon 16, 2015 3:36 pm
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One thing I found in the 2way radio repair, use 1 thick paint brissel AKA (cats WhisKker) and tickle the area that would equate to the radio's problem esp intermittent problems . Had a commercial Kenwood ht ,intermittent rx audio, after the whisker tick I found the cold solder joint. radio worked fine after that. Use thicker brissels for more stubborn areas. Good luck. EF JOHlNSON TECH.
JR


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 Post subject: Re: TROUBLE SHOOTING BAD JOINTS CIRCUIT BOARDS
PostPosted: Jan Sat 19, 2019 2:14 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12352
Location: Mpls, Minnesota
A ESR tester also works good for finding breaks in PC boards.

Dave


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 Post subject: Re: TROUBLE SHOOTING BAD JOINTS CIRCUIT BOARDS
PostPosted: Jan Fri 25, 2019 7:35 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: 253 Blanche St. Plymouth, MI USA
Freeze spray ! Great for smoking out intermittents.
Mark Oppat


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 Post subject: Re: TROUBLE SHOOTING BAD JOINTS CIRCUIT BOARDS
PostPosted: Jan Fri 25, 2019 4:03 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13515
Location: S. Dartmouth MA 02748-1225 USA
oldradioparts wrote:
Freeze spray ! Great for smoking out intermittents.
Mark Oppat
Yeppers! Makes a frostline at the crack!

Not tools that any "normal" tech would have:

Vortac circuit cooler, uses compressed air to make cold air stream...

Ultra small heat gun, has silicone rubber nozzle to direct heat onto suspect parts..

Chas

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Smith's Ale Gives Strength, Smith Bros. Brewers, New Bedford MA


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 Post subject: Re: TROUBLE SHOOTING BAD JOINTS CIRCUIT BOARDS
PostPosted: Jan Sun 27, 2019 4:48 pm 
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Joined: Feb Sun 02, 2014 9:13 pm
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Location: Roanoke, VA
When looking for intermittent mechanical causes of electronic problems I sometimes use a custom-built spot vibrator. I also use thermal cycling as mentioned upstream.

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Dale H. Cook, Antique Radios / Test Equipment (GR/HP/Tek)
http://plymouthcolony.net/starcity/radios/


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 Post subject: Re: TROUBLE SHOOTING BAD JOINTS CIRCUIT BOARDS
PostPosted: Mar Wed 06, 2019 7:22 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3423
Location: Olympia WA USA
I am given to understand that a UV light aka Black Light, helps too. Shine it on the board and supposedly cracks and bad solder joints will show up.

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FrankB
WB7ELC
"The average family has 2.5 children. Where is the other .5 child?"


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 Post subject: Re: TROUBLE SHOOTING BAD JOINTS CIRCUIT BOARDS
PostPosted: Mar Tue 19, 2019 7:28 pm 
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Joined: Jun Wed 08, 2011 2:33 am
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Location: Ohio 45177
I sometimes just rework the solder joints in the area of interest where the problem seems to be. One thing is where they snip the leads too close and cut off part of the solder blob with a flush cutter. Those can result in bad solder junctions. Reflow with new solder.


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