MacBook Air 11" (Mid 2011) 820-3024 Runs off charger but wont charge
Hi, iv got a MacBook Air 11" (Mid 2011) 820-3024 which will run fine on the charger, but when the charger is unplugged it turns off.
Iv tried 2x different chargers and 2x different dc in boards and it still wont charge. The battery has been changed and when it had charge in it the mac would run fine off the battery alone, until it went flat, then wont charge again.
The mac reports that the battery is at 0% and to replace it now, even though it has been replaced twice already with the same result.
I have replaced ISL6259 also and still have the same problem.
Im testing PPDCIN_S5_CHGR on Q7080 and am getting 14.5 volts but it should be 18.5v according to the schematic.
The board has had some water damage at one point, but this seems to be only on the dc in board, the rest of the motherboard appears to be fine.
If I measure resistance to ground on that line I get 040.0kohm , but without another board to compare to that is meaningless.
All we know what is happening so far is the voltage isnt what it should be on that line, so il see if I can find any filters or something on that line.
Iv tried two charger and two dc in boards and get that same 14.5-14.8volts at the dc in board connector.
Here are some voltages from around ISL6250 :
R5420 = good
R7085 = 0.469M
R7080 = good
R7081 = good
R7005 = good
Voltage @ R7005 = 14.1v & 14.35v
Voltage @ R7080 = 14.69v & 5.57v
Voltage @ R7001 = 5.1v & 5.05v
Voltage @ R7085 = 14.62v & 5.7v
Voltage @ R5420 = 0.061v & 0.061v