a1278 820-2879-b unknown compoant

[elitetek]

Can anyone help me identify the burnt or damage component just left of the lvds connector. You can see a burnt missing solder pad in the picture? This was a liquid spill. I don't have the schematics and appreciate any help. Can this be purchased from digikey?

 

[Beecker]

What make and model and year?

 

[elitetek]

MacBook Pro a1278 logic board 820-2879-b 2010 2.4ghz intel

Thanks

 

[Beecker]

MacBook Pro a1278 logic board 820-2879-b 2010 2.4ghz intel

Thanks

Look at this... I hope this helps. Don't mind the square red boxes.

 

[elitetek]

Thanks however The component in question is the square large black 4 pin package just left of the LVDS connector. The outer solder pad looks burnt. Please help

 

[triplelucky]

It is Q7085, an SI7149DP

 

[elitetek]

thank you triplelucky! Digi-key currently does not have SI7149DP-T1-GE3 http://www.digikey.ca/short/jbvdj in stock, but they have three other replacments. The datas sheets look a little different however wondering if I could just use one out of the three?

http://www.digikey.ca/short/j9rmw

please let me know what you think.

 

[elitetek]

bump please

 

[triplelucky]

I have not used those substitutes. Possibly someone else will comment on the best one. Also if the pin is corroded from liquid but your original part is still good maybe you could just clean up the pin and re solder it.

 

[elitetek]

Thanks Triplelucky. it seems that the pin is not even there. I cleaned the board using the ultra soinc. I will just wait until someone comments if the substitutes can be used.

 

[elitetek]

UPDATE:

SO I removed the corrosion off the pin as tripleluck recommend and resolder the pin. I am now getting 16.5V, from the pervious corroded pin4, pin 3 16.5v, pin 2 16.5v, pin 1 6.78v can anyone verify these values and if they are correct? I checked the same mosfet on the other side of the logic board and returned values of 16.5v on all 4 pins.I am getting a very dim green light still. I have also included a very interesting post for users with the same issue.

http://www.ifixit.com/Answers/View/131485/Not+turning+on.+Charging+battery+and+have+volts+across+logicboard

 

[elitetek]

bump

 

[elitetek]

is this the correct value that I should be getting from this device?

-Thanks

 

[triplelucky]

If you are working through problems that you are not familiar with and are not simple and apparent issues its always a good idea to obtain the schematics and also the board view for the logic board you are working with.
The schematics alone are little good without the board view to locate the components on the logic board.

With a little searching you can find these for less than $5 and will save you countless hours of prodding around in the unknown.

The board viewer is a windows only program but will run well on a Mac if used in a wine wrapper if OS X is your only OS on the Mac.

 

[elitetek]

bump