Technical Support Macbook Air A1369 Motheboard 820-2838 white screen no logo

Ipart

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Laptop turns on, startup sound, white screen without logo appears. All the voltage on coils seem to be ok. What else can be checked in this case.
 

Hosein Asadolahi

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Laptop turns on, startup sound, white screen without logo appears. All the voltage on coils seem to be ok. What else can be checked in this case.
check with bootable usb of mac os .
check hard disk and other component like that . ex dvdrw , wifi , ...
 
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