My Sansa m240 is now exactly one week old now, and the backlight stopped working. After I realized it wasn't working anymore, I went to settings, display, then to backlight, and it is set to go off in one minute. So now it is hard to see what it says and is very annoying.
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Re: Backlight not working
This can really be a challenge since it's you are no longer able to see the display to change the setting, see if you can shine a fliash light on it so that you can at least read the display to change it. Otherwise see if you can get it to reset to factory default by either taking out the battery or just leaving it on till it is completely drained.
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Check the orange "Hold" switch on the left side of the Sansa C150, if you cannot turn on the MP3 player or if none of the buttons is working. When the "Hold" switch is up, the buttons are disabled. Slide the "Hold" switch down to activate the buttons again. 2
Press and hold the "Power" button until the LCD screen lights up when turning on the MP3 player. Pressing the button quickly does not turn on the device. The "Power" button is located on the front of the device, under all the other control buttons. 3
Replace the AAA battery, if you cannot power on your MP3 player. To replace the battery, remove the battery cover from the back of the device by pressing in on its tab and pulling it off. Remove the old battery, insert the new battery and replace the cover. One AAA battery provides approximately 15 hours of power for your Sansa C150. 4
Change the backlight settings to conserve battery life. This is useful if you find the battery loses power quickly during normal use of your Sansa C150. To change the backlight settings, choose "Settings" to bring up the "Settings" menu. Select "Display," "Backlight" and then a shorter backlight time. The backlight will shut off after a period of inactivity that matches your backlight setting. 5
Review your music purchases to understand what rights you've purchased to the content, if you are unable to play a track back on your Sansa C150. When you purchase music, it comes with certain rules for how you can store and play it. You may not have paid for the right to transfer the song to a portable media player. 6
Reset the Sansa C150 if it acts erratically or if you have other problems. To reset the device, open the "Settings" menu and choose "Reset All." Choose "Save" to finish restoring the MP3 player to its factory default settings. If you decide not to reset the device during this process, select "Cancel" instead of "Save."
There's a timer for the display backlight that can be set and used for
saving power. When leaving the player untouched for a certain time, the backlight switches off. Touching any button will turn on the backlight, restarting the timer.
To set the backlight timer on the Sansa Clip,
execute the following steps:
1. Press Menu button to return to the Main Menu.
2. Move to Settings and select it.
3. Select Display.
4. Select Backlight.
5. Press |<< or >>| button to select desired backlight timer.
The Treo 90 had a problem with backlight failure, which Handspring acknowledged and began fixing back in 2002. However, their guideline was that if your 90 did not fail within 6 weeks of use, it did not have the defective part responsible for the failure.
Your backlight probably has just died of old age. It is EXTREMELY difficult to replace just the backlight (I've tried). If you search long enough on eBay, though, you can probably find a 90 with a broken case, dead battery, broken motherboard, or some other ailment, but with a functioning screen/keyboard assembly, including backlight. It's a pretty simple matter to replace the screen/keyboard assembly (there's a screw hidden under the battery that holds it into the front frame).