2.0GHz, 2.3GHz, oder 2.6GHz quad-core Intel Core i7 Prozessor (mit Turbo Boost bis zu 3,8GHz) mit 6MB geteiltem L3 Cache.

Alle 256 Fragen Alle anzeigen

Display Backlight not working after replacement.

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

Block Image

Block Image

Diese Frage beantworten Ich habe das gleiche Problem

Ist dies eine gute Frage?

Punktzahl 1

Kommentare:

If you need a closer lookup of any part just tell me :)

durch

FWIW the old screen worked before (it had damage) I connected it right now and it has the backlight problem too.

durch

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.

durch

I've done PRAM and SMC reset it didn't help. It was liquid damage

durch

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

durch

6 Weitere Kommentare anzeigen

Einen Kommentar hinzufügen

1 Antwort

Hilfreichste Antwort

Block Image

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.

War diese Antwort hilfreich?

Punktzahl 1

Kommentare:

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!

durch

I think either it's Backlight Driver (U7701) or Transistor(Q7706)

durch

Einen Kommentar hinzufügen

Antwort hinzufügen

Adrian Rangel wird auf ewig dankbar sein.
Statistik anzeigen:

Letzte 24 Stunden: 0

Letzte 7 Tage: 0

Letzte 30 Tage: 3

Insgesamt: 126