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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iMac, Macbook Pro, Macbook Air

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Old 01-25-2019, 03:02   #1 (permalink)
Junior Member
Join Date: Jun 2017
Location: USA
Posts: 30
Member: 2730637
Status: Offline
Thanks Meter: 7
Macbook A1534 dark screen quick fix

Model: Apple A1534
Board No. : 820-0045
Fault: the screen is black when turning on, we can hear the boot sound.

Inspection: the machine can operate. the backlight of the screen is not lit and the faint image can be seen under strong light.

first, measure the backlight boost circuit - no voltage
no voltage measured on two ends of D7701.

second, measure working conditions of U7701 - normal
Replace U7701 with a new one and test. Problem fixed.
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