평판: 13
2
So I replaced the display assembly (thanks for the great tutorial), and it worked fine for 2 days but it suddenly stopped working, after some debugging I noticed that if I shine a light behind the Apple logo the screen can be seen correctly and if I connect and external monitor it works great. I've read it my be a fuse, cable or conector but I'm not sure how to test them. My board is 820-3787-06.
Thanks
좋은 질문 입니까?
평판: 25
1
This shows the location of the backlight fuse. Check it with a multimeter. Should measure 0 to 1 ohm. If it doesn't, you're looking at a logic board replacement and/or component level repair.
해당 답변은 도움이 되었습니까?
Ok so yesterday I investigated a little more, and using the datasheet I just uploaded:
Fuse F7700: Continuity OK
U7701 EN: 3.29V
U7701 PWM: 3.27
PPBUS_SW_LCD_BKLT_PW: 11.58V
BLKT_SD: 11.42V
LCD_BKT_EN_L: 11.4V
C7726: 5V
BKL_SW: 0
BKL_FB: 0
BKL_FET_CNTL: 0
PPBUS_SW_BKL: 0V
PPVOUT_S0_LCDBKLT: 0V <---- I know this should be 55V!
I think either it's Backlight Driver (U7701) or Transistor(Q7706)
24 시간 전: 0
7일 전: 1
30일 전: 2
전체 시간: 273
댓글 11개
If you need a closer lookup of any part just tell me :)
Adrian Rangel 의
FWIW the old screen worked before (it had damage) I connected it right now and it has the backlight problem too.
Adrian Rangel 의
Tried a PRAM reset? If not, then could be a blown backlight fuse any history liquid damage drop damage? If you need board level repair, I can always help you out peep bio for that, but first thing is to try a PRAM reset.
Brady8812 의
I've done PRAM and SMC reset it didn't help. It was liquid damage
Adrian Rangel 의
Sounds like a board problem then. Unless you have a bad screen, but if the old one is doing it, then I'd go backlight problem
Brady8812 의
댓글 6개 더보기