Where did you get your theory from sceadwian?.
Mackton. Please only place a Turkey in the oven not a cct board. The advice given from this guy is obviously WAFFLE.... who couldn't recognise the difference between a Turkey and a Thermistor NTC or PTC.
Sorry XL5: you may be an MIT graduate, the son of Buddha or a Linksys designer: But your tone and use of irrelevant abbreviations depicts LACK of professionalism.
Sceadwian is right, the kitchen oven reflow may (temporally or permanently) fix broken solder problems for "home enviroment". The oven method is an option, but also using a hot-air gun (previously covering capacitors and plastic parts with aluminium foil) works nice.
Look this video
YouTube - Re-flow Video Card IBM T41p Latop motherboard
I believe that the "falling" tale is hard to believe. Hititng he floor may wreck a LCD screen, a hard disk, but a router??? Mine falls all the time, and is working.
Check the bigger components, they are prone to move during the impacts. Resolder the wall wart jack if you want to. You may try pushing (softly) some parts of the board with a latex glove, to see if anything changes. I bet it will not, but you have nothing to lose.
As somebody said on this forum, that devices are made very hard to repair on purpose. And a router is a dark place to learn. Try dismantling an old photocopier, is the most awesome device I ever seen, tons of pieces to play with