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The first thing to check is wether you have a good screen or not.
If you have already done that, then start going upstream on the backlight circuit. You should have ~22V on FL2024. That implies that the boost circuit is not working. Check the diode, D1501 and then the coil L1503. Otherwise, it will be the IC U1502.
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I'd like to add that measurements must be taken with screen connected.
Thanks @rany, good point!
I also tried to measure with attached lcd.
By measuring the voltage of the diode, me by 0 left pole
So liquid damaged board failures are different from "short to ground" failure and different from blown filter failure.
In your case, anything can be bad, starting with the backlight driver itself. If you are able to solder, you should replace the back-light driver first, check the diode, compare the voltage drop to ground of the anode line to a known good, and may be even check or replace all the filters on the display FPC: anode, cathode, and may be 1.8 to avoid future failure. Really anything can be wrong.
So then I first replaced the diode, now I get a voltage of 3.8 ...But the backlight does not work the same..
It is normal that fl2024m is continuous with condensers C1505-C1531 - c1530???
How can I proceed now?
thank you so much
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What is the history? When/why/because of what did back-light fail? Is the screen completely dim, or partially as in dark and you can still use it but cannot increase brightness?
Rany さんによる
The iphone had fallen into the water.
I turned it back on and after a few hours the backlight disappeared,
The screen is obscured but in backlight you see the image
man_fry さんによる