Re: TurboExpress - looking for schematic to diagnose low power to backlight/lcd

If you are still having issues give this a try:

A good thing to do would be remove Q900/Q901, and Q500,Q501, D502,D503 clean under them, and the components themselves, and resolder them back on, as the electrolytic juice is conductive enough to distrupt things. (wouldnt hurt with D9xx either)

Also, try for the following voltages at these Test points:
TP500 30v
TP501 -24v
TP502 5v (ish, you will see it from 4.8 to 5v depending on factory)

The 2x...