sigh, ive encounter da "same" prbl like u.
my n80, after a year da fon screen light is flickering, so i ask around da fon shops, they said it would be ribbon prbl. ok, since i still can c da screen in da light, i din bother much.
den, da screen totally black out, so no choice i haff to send it to repair. so 1 day i was shopping with my fren in sg wang, den saw a "stall" in front of a boutique providing repair service, i ask da technician to check, den da price i bargained was ok, so i jz decided to repair at that stall. so after few days, done, n i can use addi.
but rite after warranty is over, my fon screen cant c anything again. so i went back to tat stall n look for da same technician, he checked n je said it was da ribbon prbl again. so he changed another 1 for me again n it's work.
of coz i tot everything is fine. but unfortunately, da prbl came again. so 1 more time i went back to him, n he said he have to take longer time to check, coz it might LED (or sth) is not working. so ok, den he checked n no prbl, da screen is no prbl, da LED is working. but again, wen i take it back n use few days, black out again!!! gosh, den da technician thr said it would be da board prbl.
sigh, i din repair it till now, cant repair, very hard to repair, coz my fren said da technician might did sth on my board or sth, coz my fren oso selling hp, juz not in kl. =(