No led,no backlight,double beep,no internal screen in window

[hubold]

Hi,

I've got a problem with my lovely t400. Few days ago the screen started to work badly. When i turned on the computer, screen was dark. When I connect it to ac and wait for a while the green led for power supply lights up. Today, I've done the same thing, but the led won't light.

Hopefully i've got an external screen so i can work with my comp. I've checked the properties in windows, and there is only external screen. I've taken all the plastics from the screen and saw that led's are on but very dim. Also when there isn't external screen connected, t400 beep twice on the start up.


Screen is ccfl.

I've checked voltages on inverter:
- there is 20v on input
- on led is only 1,5v
- on output is about 1v AC

Fuses on MB are ok.

I've ordered new inverter and its still doesn't work.