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I soldered several pin rows on my pcb, and thought that both sides of the pcb are already connected. Therefore I only soldered the pin rows on the bottom of the pcb. Unfortunately they weren't connected, so that I have to solder the pin rows on the upper side of the pcb, too. But with my soldering tip I am not able to get below the pin rows. Is there a way to connect them without having to unsolder them?
Pictures:
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    \$\begingroup\$ Can you post a picture? \$\endgroup\$ – Some Hardware Guy Dec 4 '14 at 15:54
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    \$\begingroup\$ Can you pry off the plastic part leaving the pins bare? \$\endgroup\$ – Spehro Pefhany Dec 4 '14 at 15:59
  • \$\begingroup\$ Added pictures, @SpehroPefhany: I try to avoid that, because the pins can be unstable afterwards... \$\endgroup\$ – arc_lupus Dec 4 '14 at 16:09
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    \$\begingroup\$ You don't have to pry them all the way off, just half or three-quarters so you can get an iron under them. \$\endgroup\$ – Matt Young Dec 4 '14 at 16:10
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    \$\begingroup\$ I never did with that many pins, but with maybe 2x6 I could relatively easy pull of the plastic parts without damage and put it back on again.... but ymmv \$\endgroup\$ – PlasmaHH Dec 4 '14 at 16:20
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  1. Lever the plastic part up until it is at the top of the pins.

  2. Hold each pin with angled needle-nose pliers (to prevent heat from melting the plastic) while soldering it to the top-side pad.

  3. push the plastic back down.

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