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LCD Backlight fail but come back sometimes. Diagnostic?

Hello,

The backlight of my A1226 Laptop no works, i can see the image in the screen but without light, works fine with external monitor. I purchase a new LED Driver but don't fix the problem. After a few weeks with this issue the backlight come back but until i shut down the laptop, then, next time backlight no works again. In second time, after maybe two weeks the backlight come back again, this time i try to unplug the LED Driver without shut down the laptop for connect the new LED Driver that i purchased for testing, when i unplug the Logic Board wire from the LED Driver with the Laptop on, the backlight no works again, i connect the new LED Driver (and the old original) but backlight no works anymore.

Is this a suggestion of what can fail?

I don't know if i have a screen problem, Logic board problem or LED Driver purchased problem.

Additonal information: the screen since time ago (when works) shows some dark vertical columns. Like this:

http://blog.mclaughlinsoftware.com/wp-co...

UPDATE: Today (22.01.15), right now, in the same time that i plug the AC adapter, the LCD Backlight turns on (With the purchased LED Driver, then, i can say that works), but with the laptop OFF, only plugged, then turn on the laptop and works, until i will turn off the laptop again i assume.

Thanks for your attention.

Regards.

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7 comentarios:

deop, explain this "to disconnect the LED Driver" a bit better. Not sure what you are referring too. what driver? Also "shows some dark vertical columns." this needs to be clarified.

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Hello oldturkey03,

First thanks for your attention.

Sorry about my english. I edit the message i expect now is better. Anyway i mean that i change the Led Driver without shut down the laptop for try to not loose the backlight but the backlight turn off. I add a link from intternet with the dark columns.

Regards.

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try this Just press ctrl+shift+eject -> that sleeps your LCD Display and then press this combination again. This is a backlight issue and most likely an LCD panel issue.I don't think it's an LED driver board issue.

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BTW, if that is your screenshot, get a more neutral background. your emails are not a good public posting.

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I try it, but nothing changes. Don't worry is just a screenshot from google images.

There are another test that can i do? for assure the issue.

I don't want buy another wrong spare.

Thank you for your answer.

Regards.

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