This machine was exposed to liquid and would not start up. It initially presented with corroded left speaker amps, a shorted backlight driver UP800, as well as liquid-damaged trackpad. After cleaning and replacement of speaker amps UR660/UR630/UR600 and UP800 the machine is functional except for audio. The speakers show up as output devices in macOS but they produce no sound. Neither headphones nor microphone work. Any ideas?
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820-02098 board with no audio (A2442)
- Thread starter sekidata
- Start date
Check SPKRAMP_RESET_L and SPKRAMP_INT_L; voltage and diode mode.
Success! I found that one of the right speaker amps was also liquid damaged (UR760). Replacement restored sound on speakers. Apparently, all 6 amps must be functional for speaker audio.
Incidentally, do you know which speaker amps (A-C, D-F) correspond to what frequency ranges? Thanks.
Incidentally, do you know which speaker amps (A-C, D-F) correspond to what frequency ranges? Thanks.
