lotsa WIN in this thread. i also had a dead display. popped it out and sure enough BOTH of the 510 resistors had 1 side completely lifted of the pad.
i fixed mine, but i replaced the surface-mount resistors with 3Watt, 50Ohm through-hole resistors i have here at work. i am an Electronics Tech by trade in the Aerospace industry so i know my way around a PWB. with that said, i will HIGHLY recommend that if your resistors have worked themselves free of the solder joint from temperature cycle fatigue - REPLACE them. SMT resistors, even 1210 size SMT parts, were never really intended to dissipate alot of power (> 1/2watt...). chances are even though you reflowed the solder and added some more, the integrity of the resistor and it's pads have a high probability of being compromised. it WILL happen again, just a matter of time. but this time the resistor itself will be shot, not the sloder joint. i would recommend to look for an axial leaded part with a rating of 1/2Watt or higher. i used 3Watt components so i never have to worry about it again. also, i don't know if had been answered in previous pages but i'll put it here anyways - they are 50Ohm resistors in parallel with each other. so if you take an Ohm meter and read them in-circuit you will read ~25Ohms since 2 of the same value in parallel will read half the value of 1 resistor:
R = (R1XR2)/(R1+R2)
R = 2500/100
R = 25Ohms
OR more simply put, if you have resistors of the same value in parallel then take the value of 1 resistors and divide by the # of R's in parallel:
R = 50/2
R = 25Ohms
anyways, i replaced the R's and plugged it back in and she works like a champ now. and IMHO this thread should really be stickified since it seems to have helped quite a few peeps, myself included. but had it not been bumped to the top it wouldn't have caught my attention.