Hi. Got a Macbook Pro early 2011 model, EMC2419, with no audio. Was hoping for a loose speaker cable or audio jack replacement...
Upon opening I have discovered some liquid damage. The R6211 had obvious corrosion. Replaced it and cleaned the board PCB as much as I could. Still no audio (no output devices, no startup chime, and before Macbook shows apple logo with loading bar, it displays white screen for about 10 seconds). I have noticed solder joints around audio jack a little bit worn/bad, corrected them so they appear neat now.
Anserwing some questions before they're asked:
There is no red light in audio jack.
I am not getting PP4V5_AUDIO_ANALOG voltage.
I am not reading short between PP4V5_AUDIO_ANALOG and the ground.
I am pretty sure something is still shorted, just not sure where should I look. I have read some threads here and outside the forum, but it didn't get me much closer.
When I was cleaning and scrapping the corrosion out of pads/traces next to R6211 (pics attached with how it looked initially), one of the testpoints went off along with the corrosion. I can also see that the corroded trace going left from R6211 (HDA_SDIN0) connects straight to U1800 BGA, if that trace is well-eaten by corrosion, think that might be my problem...
If you could guide me which voltages should I check, or where should I look for shorts, that'd be very helpful indeed. Many thanks in advance!
Upon opening I have discovered some liquid damage. The R6211 had obvious corrosion. Replaced it and cleaned the board PCB as much as I could. Still no audio (no output devices, no startup chime, and before Macbook shows apple logo with loading bar, it displays white screen for about 10 seconds). I have noticed solder joints around audio jack a little bit worn/bad, corrected them so they appear neat now.
Anserwing some questions before they're asked:
There is no red light in audio jack.
I am not getting PP4V5_AUDIO_ANALOG voltage.
I am not reading short between PP4V5_AUDIO_ANALOG and the ground.
I am pretty sure something is still shorted, just not sure where should I look. I have read some threads here and outside the forum, but it didn't get me much closer.
When I was cleaning and scrapping the corrosion out of pads/traces next to R6211 (pics attached with how it looked initially), one of the testpoints went off along with the corrosion. I can also see that the corroded trace going left from R6211 (HDA_SDIN0) connects straight to U1800 BGA, if that trace is well-eaten by corrosion, think that might be my problem...
If you could guide me which voltages should I check, or where should I look for shorts, that'd be very helpful indeed. Many thanks in advance!
Comment