end of the story: once i replaced the inverter the led is still off all the time while the bt is trasmitting. so i guess its something different... i will live with it.
I have a very similar problem on my T60p. About 6 months ago, my "power" led on the lid (you know, the little circle with the 'Z' in it) just suddenly went dead. I was quite busy for my exams at that time so I just leaved it untouch and continue using it without any problem. About a week later, my BT led went dead as well. At that time, I believed that my inverter is comming to an end. How ever, I didn't care so much about that little problem, I just thought "when the whole inverter is dead, I'll replace by a new one", so, I finished my exams and enjoyed my Summer without too much attention to the 2 'dead' leds. However, a month ago, I discovered that none of my led was dead. Actually, when I close the lid to about an angle of 15 degree or so, the 2 leds light on again
. I began to suspect that it's my cable that's causing the problem, surely the thing that gets affected most by closing and openning the lid is the cable, right? So I opened the machine, reseated the cable and now everything is back to normal again. Since in this case, you've already replace a new inverter (which means you have already reseated the cable), I suggest you to take a look at the other end of the cable (the end that gets attached to the mainboard) and try to reseat it, or, if you have any 'known good' cable lying around, you can give it a try. Good luck