Backlight filters / diodes
I have a question regarding the filters and diodes on an ipad air wi-fi.
This is my first attempt to fix this kind of thing, so bear with me please because i am still trying to learn things.
So, the backlight is sometimes working (barely, left side has 50% “flashlight”) and sometimes isnt at all. (the right side of the screens seems fine)
The damage came from a blown lcd connector that burned filter L7085
If i measure both diodes D8258 and D8228, they read out somewhere around 0.6 or 0.7 (out of my head) and they do not seem cracked or whatsoever.
The filters though, at least one of them (the right one) looked bad, but i changed both of them with used filters from a donor and the backlight started working again on a new lcd, only to have it malfunction again after a few power button standby clicks.
My main question, when i measure backlight filters, do they need continuity or not?
I have always thought they did have to have continuity?
And if it does, does this count for basicly all filters on iphones aswell as ipads?
I am asking this because i bought some brand new filters off a chinese supplier but i get the feeling they didnt send me filters at all but something else. When i measure them they do not have continuity.
What is going on here?
The weird thing is, both filters on the ipad did not have continuity but the backlight still worked for a while, after it stopped working, nothing changed. Though, the filters didnt look blown again but also didnt have continuity. This is why i am so confused!
As a side question.. I did saw that one of the filters (L7085) has a bad/damaged pad/trace on the left side wich barely makes contact.
So just to be sure to have a second option on this; Seeing as L7085 is connected to D8228-K, if i was to make a jumper from L7085 to D8228-K, would this be acceptable?
Or would it be better to make it jump to C8250/1/2/3 or 4?
Thanks in advance!
Cette question est-elle utile ?