Macbook A1342 tiny missing component..please help pictures incl

elitetek

macrumors member
Original poster
Aug 21, 2012
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Just purchased a used Macbook A1342 2.26GHz. When plugged the there is no green light or oranage charging light. I then attempted a SMC bypass. However now there is a green light, but still does not power on. I plugged in the battery while the magsafe was plugged in and it turned on! chimed normally but the screen stayed white. I did plug to an external monitor and TADA! lion was up and running. I then did a pram and smc reset and still won't post normally, only when the magsafe is plugged in and the battery later is plugged in. I inspected the logic board and found a missing component which right below the LVDS connector. I have attached pictures. Does anyone know what this once was or what component should be there? any help would be fantastic!

 

elitetek

macrumors member
Original poster
Aug 21, 2012
66
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Did some research on A1342 820-2567-A logic board. The missing component is shown in the picture. Does anyone know what are the specs or measurements of this capacitor?

-Thanks

 

elitetek

macrumors member
Original poster
Aug 21, 2012
66
0
UPDATE:
It seems that the missing component is a ferrite bead. Dadioh suggests that it is a 3.3v power feeding the LCD. The A1278 suggests that it is a 120OHM 1.5A Ferrite. Thank you Dadioh! would any one have the schematics or know the part number for the ferrite bead.
 
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elitetek

macrumors member
Original poster
Aug 21, 2012
66
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Can anyone please confirm some measurements with me. I have having major issues. I measured DC in and the first 2 pins I am receving 25V, Pin 3,4 0V and Pin 5 5.5V. I also checked the G3HOT which is 5.5V. I think its supposed to be 3.42V correct? I also checked the power fuse located to the right and it shows 25V. I am checking with the board removed and the magsafe, if that helps. can anyone please confirm these readings. thanks!
 

elitetek

macrumors member
Original poster
Aug 21, 2012
66
0
this went to bad to even worse. The unit powers on however does not chime nor display an image. after about 2 min with it powered on the superdrive powers on, but still no image. any help would be great.