MacBook Air A1466 board 820-000165 - I've got no backlight. Backlight fuse is fine, and I've got 8.5v on that one. I replaced the backlight driver with one from a donor board but no results. I've also swapped the screen but still no backlight. What else can be checked?
Macbook A1466 - no backlight
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Re: Macbook A1466 - no backlight
check voltage on d7701 both side.
check lvds connector pin 3-4 if are ok or have oxidized and move from place.
edit: u sure no backlight ? ( u can see folder icon or os loading )? if screen is totally black can be also braindead.
check if usb pendrive led blink when ocnnected if ur not sure if its backlight poroblem only.Last edited by dellxps15; 05-24-2023, 03:50 PM. -
Re: Macbook A1466 - no backlight
Try a new backlight IC rather than a donor. Reballing these is a pain, they are pretty cheap so I don't bother. 8.5V shows that at least the BL is enabled, just the 25V boost isn't working. Also check pin 5 under the IC for continuity to D7701.Comment
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by Comp_ProHello all,
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Tests performed:
There is no backlight even with a good screen.
Backlight IC is receiving the correct support voltages.
Fuse F8400 ok
Current sense resistor R8400 ok
Backlight IC is receiving 3.3V on enable pin.
Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
Backlight IC receiving 5V from PP5V_G3S
Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
I2C_BKLT_SCL and I2C_BKLT_SDA both measure... -
by imcoolHello,
On this Macbook Air A1466 with 820-00165
I have only 8V on backlight line but no high voltage in boost circuit, I have checked all components like caps and diode and they seems to be ok.
I have noticed that when macbook chimes after turning on there is no image at all even with flash light,
I have tried 2 different OEM LCD and still there is no image,
I see the LCD fades out when i remove power or turn off the macbook.
I have 2 problems
1 No image
2 No backlight, but i have 8VDC on backlight circuit.
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