I had a Samsung Epix and Samsung Omnia before which had a backlight issue (very unlucky). I tried to have it checked in samsung service center and the only option was to replace the mainboard which cost a lot since I don’t have the receipt anymore. The problem with the backlight was it does not turn off automatically by itself. It will only turn off if the device is set to turn off. The problem here is that If you’re surfing the internet with your phone and set the backlight to turn off after 1 min, device turn off after 3 mins. The backlight won’t turn off until the 3 min mark which will drain your battery. Another problem is that the phone backlight will not turn off if it’s sync to activesync/charge. You will need to turn it off by pressing the power button, but that ends up disconnecting to activesync also.

Further research provided me information that the backlight auto dims before it turns off . To fix the backlight issue, what I did is to force the backlight to turn off instead of going auto dim by editing the registry information below. You can use total commander/ phm registry editor or resco registry editor if you are having the same problem as mine.

I hope this method saves everyone the cost of replacing their mainboard.

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Power\State\BacklightOff]
“bkl1:”=dword:00000003
“Flags”=dword:10010000
@=dword:00000000