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    A1466无背光(暗屏)维修

    [复制链接]
    发表于 2018-6-14 15:46:32 | 显示全部楼层 |阅读模式

    收到客户一台苹果笔记本,客户描述开机能听到咚~的一声开机声,但是屏很暗,可以隐约看到图像。接过机器开机真如客户所描述。这是典型的背光电路故障,或者说是升压电路问题。沟通好之后拆机检测主板,测量屏线接口处电感无电压,说明是升压电路没有转换过来,如图电感L7701电压由PPG3H_G3H经过保险F7701再由N沟道导通转换而来。量保险F7701两头都有8.45V电压则保险没坏,测量Q77064脚8.45V电压,1256脚无电压,3脚还是8.45V。看来问题就在这一块。正常的电路是Q7707,2脚和5脚得到高电平导通双mos管接地,也就是R77892脚接地,起到R7788和R7789串联分压给Q7706,3脚一个低于4脚8.45V的电压则可以实现导通,侧量Q7707,2脚和5脚都有3.3V。电压正常,更换Q7707还是原故障,更换 分压测量分压电阻阻值正常,罪魁祸首可以确定应该是Q7706被软击穿了,测量阻值是正常的,更换一个Q7706完美亮机,维修到此结束。

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