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Actually no. If you use the 3.4V figure and calculate the resistor to get exactly the maximum allowed current, then if you happen to get diodes that have Vf only 3.0V the current through those will be larger than the maximum current you aimed for. And that is not very good for long term reliability.it's best to use the 3.4V figure per LED drop, since that's worse case and LEDs could drop that much...
and the tv problem hit here about the turn of the century, not just crap parts, but crap boards, and I mean some kind of pcb material that grew dendrites (no, not tin plated, or at least, I think that was before the pure tin plating problem, here at least) and shorted things out. I had one client that was a tv repair type, and I remember him complaining about, wait for it, chinese boards... (apologies to our chinese viewers)...