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Current version by: Alessio Antonini ,

Title:

Need info about a component on logic board.

Text:

Hi,

I have a problem with screen backlight on my MBA. The screen turns on but backlight don't. Probably I found the problem on the logic board, the yellow fuse shown with the red arrow in the image is broken.

[image|601890]

Is there anyone can help me to find the fuse specifications?

Thank you very much.

Alessio

=== Update (09/03/2015) ===

Hi Israel,

thanks a lot for your precious help providing the images.

I made the resistance measurement. Since I don't know the position of the FET pins I cannot specify when in direct or reverse polarity. Anyway here it is the values:

Q9706: 299 kohm and 288 kohm (reverse). Tested on the green circles in the image posted

Q9707: 0.7 Mohm and 5 Mohm (reverse). Tested on the red circle in the image posted.

R9788: 298 kohm

R9789: 146 kohm

C9782: 95.5 nF

I hope this numbers make sense. Waiting for your comments.

Alessio

[image|618740]

Device:

MacBook Air 13" Mid 2011

Status:

open

Accepted Answer:

+245935

Edit by: Alessio Antonini ,

Title:

Need info about a component on logic board.

Text:

Hi,
I have a problem with screen backlight on my MBA. The screen turns on but backlight don't. Probably I found the problem on the logic board, the yellow fuse shown with the red arrow in the image is broken.
[image|601890]
-Is there anyone can help me to find the fuse specifications?
+Is there anyone can help me to find the fuse specifications?
Thank you very much.
Alessio
+
+=== Update (09/03/2015) ===
+
+Hi Israel,
+
+thanks a lot for your precious help providing the images.
+
+I made the resistance measurement. Since I don't know the position of the FET pins I cannot specify when in direct or reverse polarity. Anyway here it is the values:
+
+Q9706: 299 kohm and 288 kohm (reverse). Tested on the green circles in the image posted
+
+Q9707: 0.7 Mohm and 5 Mohm (reverse). Tested on the red circle in the image posted.
+
+R9788: 298 kohm
+
+R9789: 146 kohm
+
+C9782: 95.5 nF
+
+I hope this numbers make sense. Waiting for your comments.
+
+Alessio
+
+[image|618740]

Device:

MacBook Air 13" Mid 2011

Status:

open

Edit by: Alessio Antonini ,

Title:

Need info about a component on logic board.

Text:

Hi,
-I have a problem with screen backlight on my MBA. The screen turns on but backlight don't. Probably I found the problem on the logic board, there is not electrical continuity in the yellow fuse shown with the red arrow in the following image:
+I have a problem with screen backlight on my MBA. The screen turns on but backlight don't. Probably I found the problem on the logic board, the yellow fuse shown with the red arrow in the image is broken.
[image|601890]
-Please can you help me to find the fuse specifications? Probably I can find it in the Mouser catalog.
+Is there anyone can help me to find the fuse specifications?
Thank you very much.
Alessio

Device:

MacBook Air 13" Mid 2011

Status:

open

Edit by: Alessio Antonini ,

Title:

Need info about a component on logic board.

Text:

Hi,

I have a problem with screen backlight on my MBA. The screen turns on but backlight don't. Probably I found the problem on the logic board, there is not electrical continuity in the yellow fuse shown with the red arrow in the following image:

[image|601890]

Please can you help me to find the fuse specifications? Probably I can find it in the Mouser catalog.

Thank you very much.

Alessio

Device:

MacBook Air 13" Mid 2011

Status:

open

Original post by: Alessio Antonini ,

Title:

Need info about a component on logic board.

Text:

Hi,

I have a problem with screen backlight on my MBA. The screen turns on but backlight don't. Probably I found the problem on the logic board, there is not electrical continuity in the yellow fuse shown with the red arrow in the following image:

[image|601890]

Please can you help me to find the fuse specifications? Probably I can find it in the Mouser catalog.

Thank you very much.

Alessio

Device:

MacBook Air 13" Mid 2011

Status:

open