820-3115 no audio? no chime

gadgetfix

New member
hey guys,

This one had no power/no boot. Upon closer inspection i found some corrosion under the grey spongey type sticker next to battery connector. Once i peeled it away i noticed some corrosion and tested components to find short on one of the caps. it was corrosponding to pp_audio_ch and shorting to ground. I also lifted the U6400 and reballed just incase there was any crap under there. All is well boots but no chime.

I notice now pp3v42_g3h is measuring 3.50v??
What is the best way to proceed. Thanks
 

2informaticos

Administrator
Staff member
Check if any traces to audio area is corroded.
There are some small coils placed on the power rails.
U6400 is only for microphone.
 
Last edited:

gadgetfix

New member
Not sure what it was my workmate washed in ultrasonic and pram few times and sound came back. not sure what was causing the issue.
 
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