2
Score
Roy
35
Asked
I replaced the LCD, but the backlight turns off after 2 seconds?
Did I mess up the connection to the inverter? The screen looks great for about 2 seconds at start up, after waking from sleep (also for 2 seconds), and when I take the brightness from all the way down to anything up. But it never stays on for more than a couple seconds. I can still see images on the screen it's just not illuminated.
A magnet did drop out while I was re-installing the LCD and I can't tell where it is supposed to go. Does it trigger a control to keep the backlight on? It is not one of the 4 magnets in the top corners of the LCD case. Thanks for any help you can give!
5
Score
markus weiher
22.7k
Answered
Accepted Answer
there are most likely 3 possible problems
- the inverter cable is scuffed or clamped
- the backlight tubes (CCFL) are defective
- the inverter is faulty
i marked the magnet position on the picture, but it has nothing to do with the backlight problem. did you change the inverter too ?
check the position of the inverter cable
I got the magnet back in place, but, like you said no effect on the backlight. I did not change the inverter, and I didn't take the case apart to get into the area you showed. I only removed the LCD frame from the enclosure. Could be a cable, I may try to put the old one back in to see if it acts the same way. The old one was working fine apart from the cracks. It's strange that I can get it to come on repeatedly by changing the brightness from 0 to 1, but it goes off after 2 seconds! It seems as though everything can function, but something is sending a signal to turn the backlight off.
Roy,
Took it by the Apple store to talk to a "Genius" He agreed it was somehow related to the inverter. Thanks for your help!
Roy,
0
Score
lemerise
17.3k
Answered
0
Score
dadioh
211
Answered
When it dims do you see the screen display the dimming logo (the one that hows the brightness sun logo and the bars decreasing below it? The reason I ask is if the key on the keyboard that controls brightness is "stuck" then it would continuously dim the display. You could verify by disconnecting the built in keyboard and using an external keyboard.
Just a thought...
Yes I did see the icon, turns out it was a problem with the wires and/or connector to the inverter. thanks
Roy,
+ well stated question
mayer,
A quick follow up. The replacement LCD must have been a refurb. The wires coming out of it to plug into the inverter had been repaired. I sent the screen back and ordered another from a different vendor. This one worked perfectly. It must have been the connection to the inverter! Thanks for all the help and advice
Roy,