Fried the chip?

[ralph23]

Hello all,

I'm finished all the soldering and now troubleshooting the chip.

I have connected the power supply (12V battery for testing) and with J2 open (meaning it's in sleep mode?) it consumes 140 - 110 mA (fluctuating like that).

When I short J2, it's still the same current draw. I even see a small arc at the terminal when I connect the battery!

The chip is heating up to ~40ºC in less than a minute.

Not right at all...

I am wondering if I fried the chip while soldering or there is a solder bridge there.

So I checked the chip with continuity tester between all the legs, and it flagged leads 5 & 6. This is the Analog GND and VRef??? It measures 57 ohms across these legs with the power off.

While running the speaker outputs give 2.8V and 0.15V DC offset respectively. My basic oscilloscope shows an AC component on both of tese with Vp-p of ~100 mV, and a freq. of ~ 1Mhz.

ANY HELP appreciated... I think I should just replace the chip, it seems it must be fried.

[ralph23]

Well, got the replacement chip, thanks Jan.

Soldered the new chip on, and consumes ~80 mA, but still fluctuating. Oddly, in sleep mode it's still in the 30-40mA draw range... maybe my DMM is out of wack.

Output offset ~30mV on both channels, so I tried to hook up speakers.

SUCCESS!

Both sound fine, time to box it up!