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Author Topic: Close call with Factory Solder Joints!!!  (Read 556 times)

Offline Wynn Robins

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Close call with Factory Solder Joints!!!
« on: October 03, 2010, 08:04:07 PM »
flying a trimiing flight my T-Rex yesterday -  am just finishing some outside loops to check tracking -2 minutes into a flight - the motor cuts .....i have to dance a jig and run backwards to save the plane - just pull out about 2 feet off the dek and manage to land with no damage. (PHEW)

pull the safety plug out to disconnect the battery to investigate why the motor cut - remove the battery hatch and there is a melted deans connector with the female pole melted OUT of the casing........weird !!!

Take the pack out - and see that the solder joint that was on the safety swith side had come off the pole cleanly - almost like it "snapped" off - pulling the wire with it - there were some arcing marks on both poles (which I guess created the heat to melt the plug)

Checked the battery - all good, checked the motor and ESC - all good.......fortunately no real damage.  BUT I am definately taking apart ALL the factory solder joints on ALL my stuff and doing them again properly.... I am a bit shocked that the factory solder joint let go - it was a high end product that did it.!!!!!


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In the battle of airplane versus ground, the ground is yet to lose

Offline Dean Pappas

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Re: Close call with Factory Solder Joints!!!
« Reply #1 on: October 04, 2010, 11:37:10 AM »
So this was a problem with the safety switch harness?
Dean P.
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Offline Tim Wescott

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Re: Close call with Factory Solder Joints!!!
« Reply #2 on: October 04, 2010, 11:50:08 AM »
Quote from: Wynn Robins on October 03, 2010, 08:04:07 PM
Take the pack out - and see that the solder joint that was on the safety swith side had come off the pole cleanly - almost like it "snapped" off - pulling the wire with it - there were some arcing marks on both poles (which I guess created the heat to melt the plug)
That sounds like a cold solder joint, or like the connector wasn't clean when it was soldered.

If the vendor is even remotely interested in making things right, you'll do them a service by putting everything into a bag and sending it to them so they can see the remains -- it'll help them identify what part of their process is broken down.  So ask them if they'll make things good, and if they want the bad part.
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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Wynn Robins

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Re: Close call with Factory Solder Joints!!!
« Reply #3 on: October 04, 2010, 01:06:01 PM »
Quote from: Dean Pappas on October 04, 2010, 11:37:10 AM
So this was a problem with the safety switch harness?
Dean P.

Dean, it sure was - moreso at the connection from the batttery to the safety switch harness.


Tim, I live in New Zealand and shipping costs are prohibitive to send a small item like this back to the States.
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In the battle of airplane versus ground, the ground is yet to lose

Offline Tim Wescott

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Re: Close call with Factory Solder Joints!!!
« Reply #4 on: October 04, 2010, 02:32:55 PM »
Quote from: Wynn Robins on October 04, 2010, 01:06:01 PM
Tim, I live in New Zealand and shipping costs are prohibitive to send a small item like this back to the States.
Bummer.  I hope they can make it good for you one way or another.  Post pictures, and those of us who occasionally (or often!) get paid to solder things may be able to identify their process problem.

And wiggle all the connections on anything else you have from them.
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AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Dennis Toth

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Re: Close call with Factory Solder Joints!!!
« Reply #5 on: October 04, 2010, 02:37:04 PM »
Guys,
This is an interesting point, I had a single wire on my TP 610C charger - balancer connector that had an intermittent open and would give me a message that I had the wrong number of cells hooked to the charger. I at first thought is was the battery but then it started doing it on every battery that I plugged in. I checked the continuity through the connector back to the plug in to the charger and found the #3 pin was not making positive contact. I was able to resolder that pin to the board and it solved the problem - so if you start getting messages from your charger indicating the wrong number of cells and you know you have the correct # input start looking for a broken or cold solder joint.

Best,         DennisT
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