From: legg@nospam.magma.ca   
      
   On Wed, 6 Sep 2023 20:38:27 +0200, Arie de Muijnck    
   wrote:   
      
      
   >> I see no I2C data traffic to the lamp control IC U2   
   >> - both lines pulled low.   
   >   
   >That is an illegal state, I2C idle is both lines high.   
   >This indicates a double short, or a bad 16-bit expander.   
   >   
      
   Can now see I2C clk and data lines are running when either   
   the charger is connected or the unit is playing.   
      
   The low condition occurs when the charger is disconnected   
   and the unit is not playing (ie is off). I guess that is   
   reasonable. . . . silly me. . . . or I could have been   
   measuring the wrong pins on the wrong IC (it has happened   
   before).   
      
   The volume control switches are routed through the TPS1116   
   - and THEY are functional. I can see the volume inc and   
   decrement on the I2C lines in response to a button press   
   and hear the difference.   
      
   . . . . .but the battery capacity indicators and others   
   (besides the CPU-driven 1/0 white and BT blue connect) are   
   not being driven from the TPS1116 pins.   
      
   RL   
      
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