700m laptop backlight fails after 1 min.
- From: John Vallelunga <johnv@xxxxxxxxx>
- Date: Tue, 29 Apr 2008 17:22:25 -0700
My wife's 700m laptop backlight will light up when first turned on, but then shuts down after 30-200 seconds. An external display works fine. I assumed this was an inverter problem and bought a new one. I replaced it today, but the problem remains. And yes, all the connectors seem to be solid.
After some research, others have suggested the lid-closure switch could be the culprit, but this switch seems to be working just fine. I can boot to the bios and see the backlight come on and off as I activate the switch (this assumes I do it within the 30-200 seconds that it works.)
Two questions:
1. Can a bad backlight tube cause this problem? It seems to work fine, and has normal brightness when it works. Could it be taking too much current which makes the inverter stop working? Could it require more voltage once it warms up? Any chance that replacing the tube will help?
2. Any other ideas or suggestions?
Thanks, JV
.
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