Thread: Victor Burnouts
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Unread 04-05-2005, 01:24
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Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
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Re: Victor Burnouts

Bob,
The best way to handle the pins is this...
1. Use a solder sucker or solderwick to remove as much as solder as possible.
2. Heat just the pin with your iron and wiggle the pin with a small screw driver. While the pin is moving, remove the iron and the pin will not solder itself back in place.
3. Remove the device.

Any pad that lifts off is likely part of a plated through hole. When you install the new FET, just add solder to the bottom of the board and watch to see if the solder wicks up inside the hole. What is unknown is whether the board has more than two layers. Although some teams report that replacing FETs works, they can take out other devices. For the cost and reliability issues, I recommend a replacement. Anything that is stressed enough to take out FETs has other problems waiting to happen.

Edit...BTW a square pad is usually an indication of a particular pin (often pin 1) to assist with part insertion. Watch which way you put the FETs back in, they don't like to be reversed.
You also may need to clean out the holes if the new one doesn't go in easy. Forcing it may push out the plated through hole. If this is a multilayer board, pushing the hole out kills it in most cases.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.

Last edited by Al Skierkiewicz : 04-05-2005 at 09:26.