Hi,
I was given a not working MBA in which coffee has been spilled.
First inspection revealed a bit of corrosion next to U7200. I cleaned that, and replaced the caps and resistors involved.
The rest of the board has traces of coffee, but nothing too bad and no other trace of corrosion. I cleaned the coffee with alcohol.
When I power the board, I get a green light and then orange light on the charger, so SMC talks to the charger properly.
The fan then starts spinning, which is usually a good sign. Board draws 156mA at that point.
Then about 8 seconds later, the fan slowly starts ramping up to full speed. Once it is at full speed, I have a 192mA current draw on the board.
If I connect the board to the display, I get nothing there. No backlight, and also no image. I have no way to know if the display is working fine, and I don't have another one of that kind.
I checked most power rails and they look good. I have working Vcore.
CPU doesn't get hot.
So at that point I'm not sure if I have a working board with a defective screen, or a defective board. Any suggestion what I could try next ?
I was given a not working MBA in which coffee has been spilled.
First inspection revealed a bit of corrosion next to U7200. I cleaned that, and replaced the caps and resistors involved.
The rest of the board has traces of coffee, but nothing too bad and no other trace of corrosion. I cleaned the coffee with alcohol.
When I power the board, I get a green light and then orange light on the charger, so SMC talks to the charger properly.
The fan then starts spinning, which is usually a good sign. Board draws 156mA at that point.
Then about 8 seconds later, the fan slowly starts ramping up to full speed. Once it is at full speed, I have a 192mA current draw on the board.
If I connect the board to the display, I get nothing there. No backlight, and also no image. I have no way to know if the display is working fine, and I don't have another one of that kind.
I checked most power rails and they look good. I have working Vcore.
CPU doesn't get hot.
So at that point I'm not sure if I have a working board with a defective screen, or a defective board. Any suggestion what I could try next ?