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I had to resolder mosquito zapper's black and red wires back after zapper fell on the floor and black wire detached and later red wire detached when i was trying to solder black wire back. After resoldering wires, the zapper no longer produced sparks as it did previously and its electricity did not kick away mosquitoes at all anymore. Can it be that i used wrong material for resoldering? It was solder of 67/33 i think from China with 2% flux:

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UPDATE: Here are 3 new close-up pictures where you can see in better details:

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    \$\begingroup\$ This is for sure NOT caused by bad/wrong soldering material. \$\endgroup\$
    – Al Kepp
    Commented Feb 19, 2012 at 16:24
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    \$\begingroup\$ @LeonHeller Why nothing? I was referred to ask such question here. \$\endgroup\$
    – Boris_yo
    Commented Feb 19, 2012 at 18:18
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    \$\begingroup\$ Why did you have to resolder it? What have you resoldered? \$\endgroup\$
    – clabacchio
    Commented Feb 19, 2012 at 18:50
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    \$\begingroup\$ @LeonHeller: Since when does every question on this site have to be related to the design of electronic systems? Last I checked, the title of the site is "Electrical Engineering", not "Electronic Design". \$\endgroup\$
    – Chris Laplante
    Commented Feb 19, 2012 at 19:36
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    \$\begingroup\$ See the FAQ, it states electronic design. This question isn't about EE, either. \$\endgroup\$
    – Leon Heller
    Commented Feb 19, 2012 at 20:12

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I would look over the board carefully by eye, and with a continuity tester. Look for a crack in the board or in a solder joint. If you find a crack in a joint, reflow that solder. If you find a crack in the board, bridge it with solder or a wire.

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  • \$\begingroup\$ But since there is voltage multiplier will it burn multimeter? Zapper reduces voltage and increases current, people say so grill kicks away mosquitos. \$\endgroup\$
    – Boris_yo
    Commented Feb 20, 2012 at 13:36
  • \$\begingroup\$ The circuit will be powered off while you are testing it. \$\endgroup\$
    – David Schwartz
    Commented Feb 20, 2012 at 20:38

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