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My phone's external speaker won't work again. I've done a software repair and have the lastest os 5.1.1 but still my external speaker won't work.
Hi renzdizon,
Have you performed a diagnostics test on the device?
Menu > Settings > About Phone > Diagnostics > Test handset
Check out the speaker and let us know what happens,
Yes, I ran the diagnostics but still no sound.
already done a software repair using pcc before I posted here but problem still persists. 
I agree, this sounds like it may be hardware related.
However if you performed a software repair and then restored the handset immediately, then I would first suggest booting to Safemode to see if the issue continues.
let us know how you get on.