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Versione corrente di: mayer ,

Titolo:

820-3115-b no backlight issue but has video

Testo:

I have a MacBook Pro 820-3115-B.

There is no water damage and the customer brought it in for a thermal paste cleaning.

I changed the paste and put it all back together to find out they no longer have backlight…

The LDVS Cable has no damage nor the connector as I checked all the pins for damage….

I shined a light from the back and you see a image just no backlight…

Anyways, I am very little experienced in board level repairs and reading schematics but I did check the fuse… I thought it was that an I removed and ran a micro wire for testing and still no backlight..

However though the fuse reads when turned on and booting 11.7volts which I thought should be 12.5 volts

I also tested:

Capacitor C9710 1 Pin, the voltage is 5V

R9731 and R9715 to split voltage, the voltage measured is 2.9volts

Measure the resistor R9704 2 Pin, it has 3volts

I am not sure if U7901 IC Is blown for some odd reason. I take these MacBooks apart all the time and never had this issue….

Can someone guide me fixing this and what else to check….. I don’t know what else to do

Dispositivo:

-MacBook Pro 15" Unibody 2.53 GHz Mid 2009
+MacBook Pro 13" Unibody Mid 2009

Stato:

open

Modifica di: mayer ,

Titolo:

820-3115-b no backlight issue but has video

Testo:

I have a MacBook Pro 820-3115-B.

There is no water damage and the customer brought it in for a thermal paste cleaning.

I changed the paste and put it all back together to find out they no longer have backlight…

The LDVS Cable has no damage nor the connector as I checked all the pins for damage….

I shined a light from the back and you see a image just no backlight…

Anyways, I am very little experienced in board level repairs and reading schematics but I did check the fuse… I thought it was that an I removed and ran a micro wire for testing and still no backlight..

However though the fuse reads when turned on and booting 11.7volts which I thought should be 12.5 volts

I also tested:

Capacitor C9710 1 Pin, the voltage is 5V

R9731 and R9715 to split voltage, the voltage measured is 2.9volts

Measure the resistor R9704 2 Pin, it has 3volts

I am not sure if U7901 IC Is blown for some odd reason. I take these MacBooks apart all the time and never had this issue….

Can someone guide me fixing this and what else to check….. I don’t know what else to do

Dispositivo:

-MacBook Unibody Model A1278
+MacBook Pro 15" Unibody 2.53 GHz Mid 2009

Stato:

open

Post originale di: Daniel Ringuette ,

Titolo:

820-3115-b no backlight issue but has video

Testo:

I have a MacBook Pro 820-3115-B.

There is no water damage and the customer brought it in for a thermal paste cleaning.

I changed the paste and put it all back together to find out they no longer have backlight…

The LDVS Cable has no damage nor the connector as I checked all the pins for damage….

I shined a light from the back and you see a image just no backlight…

Anyways, I am very little experienced in board level repairs and reading schematics but I did check the fuse… I thought it was that an I removed and ran a micro wire for testing and still no backlight..

However though the fuse reads when turned on and booting 11.7volts which I thought should be 12.5 volts

I also tested:

Capacitor C9710 1 Pin, the voltage is 5V

R9731 and R9715 to split voltage, the voltage measured is 2.9volts

Measure the resistor R9704 2 Pin, it has 3volts

I am not sure if U7901 IC Is blown for some odd reason. I take these MacBooks apart all the time and never had this issue….

Can someone guide me fixing this and what else to check….. I don’t know what else to do

Dispositivo:

MacBook Unibody Model A1278

Stato:

open