JBL Flip3

A little optomistic here maybe . . . no turn-off from switch in later trials.

RL

. . . . but will react to turn off button press five minutes later.

RL

... ...

That is an illegal state, I2C idle is both lines high. This indicates a double short, or a bad 16-bit expander.

I realize that, which is why I mentioned it. Double shorts being hard to come by . . . .

Remeasuring after hardware/factory reset shows both lines floating high, now, with no short. The TCA1116 is unobtainium.

Though TI flogs a pin-compatible replacement, they refuse to supply the original TCA1116 data sheet, for performance, address and power sequencing comparisons. They will provide the old data, through email, only to registered users of E2E support. Why the shyness?

The working white and blue LEDs are driven directly from the main control chip.

The 0/1 switch feeds a crude SW/HW reinforced latch.

RL

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

Thanks for the proper diagrams.

I noticed that all problems seem to be with the switches and the battery state LEDs. In the flip3 indicators diagram those have the GND pin in common. The other LEDs are using VCC. Could it be that GND in that connection (J11 pin 13 to J9 pin 1) has a bad contact? That would explain most (all?) problems. You could solder a jumper wire in parallel from PCB to PCB to test this hypothesis.

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

Good Catch. It was the chafed harness edge's ground connection.

The TSP1116 charge level indicators are only active for a short time after a button press, so it was possible to see no pull-up action on those output pins and blame the chip.

Thanks for your interest and assistance.

RL