Technical Support Macbook pro A1990 820-01814 no Backlight

user61596

isa198585
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it was schurt to GND on one of Capasitors
C8460 C8461 C8462 C8463 C8464 C8465
C8466 C8467 C8468 C8469 C8470 C8471
C8472 and C8473 can´t say wich one exactly.
I replaced all, now the mosfet will be open,
cause it get firs second 3V, and Backligth will work.
But I can´t get image, don´t now why, Please Help why.
 

user61596

isa198585
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I dont get Image now, what I have to try, I get my order U8400, but I dont tryed now, will do it tomorow, But I can´t understand why I dont have Image. Please look the link and what I have to try to get Image.
My be it, cause I try without Battery and Battery Comunikations Flex Cable, will try later, what can your say, It is Posible?
 

Hosein Asadolahi

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so I just soldered my new U8400, nothing has changed.
So I removed this U8400 and Q8400 and soldered it to a working macbook ,Backligth is here, its woking perfectly, so we can be sure, U8400 and Q8400 is fine.
But my Problem now, its that I can´t get Picture, I don´t talk now about Backligth, my First Problem was No Backligth, but now, I don´t get Picture. ( look a Video👆
remove display and test with hdmi (external display)
 

user61596

isa198585
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I have one Q. Can I make jumper from pin 3 to pin 2, do your know it will be work or no?
 
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