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laptop lcd goes dim - brightness fault!?

October 6, 2010 at 01:47:45
Specs: Windows vista
Hi guys,
I cannot figure out this one, it seems to be really tricky one..
I have already tried new lcd inverter, but it did not help. Simply, You turn the asus a6r laptop on, the screen sometimes comes dim then the windows boots up..I log in, then I press
fn+LCD on , the display turns on for a few seconds then goes dim again,the picture of the desktop is still hardly visible..
I found out that this is also Brightness related problem, as when I turn the brightness completely down, the lcd stays like that for even an hour or more.. so functions in a normal way, but when I turn the brightness up by even one click on the keybord, the lcd goes dim in a few seconds.. then again I gotta turn the lcd back on with fn+lcd on button/f7/ and turn the brightness all the way down, then it stays like that.
As if the lcd was not capable of supporting normal brightness...could it be the lack of power the lcd could be getting or what else could it be? Im trully puzzled here...
Any suggestions or help much appreciated.
Thank you.

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October 6, 2010 at 03:07:15
When the inverter was replaced were the CCFL tubes also replaced as they are both usually replaced at the same time.

The CCFL is the most likely component to fail as they do have a limited life span.


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October 6, 2010 at 03:50:03
No, I have not replaced the CCFL lamp, and the inverter I bought and replaced the old one worked the same..the same dimmness..and
again..the same reaction to the brightness and fn+f7/lcd on/ key..

I am thinking, if the lamp was would not be able to work at all..not even on the lowest brightness setup..right? but this one works just fine on the lowes brightness setup..its just when you try to brighten up the lcd, it goes off..

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October 6, 2010 at 05:12:40
CCFL don't normally fail outright, not like an incandescent bulb The are the same technology used in Florescent lighting in shops and offices. When they get to the end of there useful life they start misbehaving, sometimes they work, sometimes they don't. They get progressively dimmer until eventually they fail completely.

The fact that the new inverter behaves the same way as the old indicates something else at fault and the CCFL is the most likely culprit. I would try replacing the CCFL.


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