From: legg@nospam.magma.ca   
      
   On Thu, 7 Sep 2023 09:56:22 +0200, Arie de Muijnck    
   wrote:   
      
   >On 2023-09-07 01:49, legg wrote:   
   >> 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   
   >   
   >So maybe the MCU does not know the battery condition?   
   >Or the measured value is out of spec. Check voltage dividers etc.   
   >Does the charging stop automatically or MCU controlled?   
   >Do you have a USB-USB charge measuring dongle?   
   >(The schematics are mostly unreadable for me).   
   >   
   >Arie   
      
   I found the trouble - connex were NOT OK - The ribbon cable   
   to thecharge level display had a broken edge trace for ground   
   connection.   
      
   MCU driven leds werepull-down. Charge display is pull-up.   
      
   I frankly didn't see any pulling-up going on at the TSP1116   
   output ports.   
      
   The 0/1 switch now works for both on and off functions.   
      
   Good enough for now.   
      
   RL   
      
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