Toshiba L300-21Z Laptop: Audio Codec ALC268 & Amplifier AN12947A Replacement, Sound Card, Speakers

I have to repair the Toshiba L300-21Z laptop. The audio codec (ALC268) and the amplifier (AN12947A) were damaged. After replacing it with a new laptop, it correctly detects the sound card and plays the sound on the headphones. Silence on the speakers. AN12947A has a built-in headphone and loudspeaker amplifier. Switching is carried out with a logic signal on the appropriate knives. Podejzewam that it has been damaged by this control circuit. Does anyone have an L300 schema or a fragment of the schematic with a switching circuit?

Page with AN12947A


Page from _ALC268

Unfortunately, the case is not as simple as I initially thought. After more accurate measurements it turned out that the laptop correctly detects the connection of the headphones, the audio codec (ALC268) correctly switches the signals between the inputs for the headphone and loudspeaker signal. The signals reach the amplifier's block, unfortunately there is no sound in the speakers. The sound is correct on the headphones.
Amplifier power supply OK, voltage at the HP_STBY and SP_STBY 5V input. Submiilame for AN12947A amplifier tests for a different one and the symptom is unchanged. Does anyone have any ideas?

I was looking for an AN12947A coffee note, but even on the PANASONIC website it is not there.

I am refreshing the topic.
In addition, during the measurements it turned out that between the digital and analog mass is around 20 Ohm. During operation, the analog mass has a potential of about 1.4V relative to the digital mass. Podejzewam with damaged some path / resistor connecting analog and digital masses. Maybe someone also has a piece of the diagram showing the point in which the analog mass is emitted?

I am refreshing the topic

In addition, during the measurements it turned out that the meidza analog and digital mass is around 20 Ohm. During normal operation between analogue and digital mass, this results in a voltage drop of approximately 1.4V. I pick up the path's damage, or the resistor / jumper through which the mass of the analog and digital connects. Does anyone have a piece of a schematic where the analogue mass is distributed to the audio systems?

M@rek wrote:

anyone have a piece of a schematic where the analogue mass is distributed to the audio systems?

On the second picture is the R776 jumper that connects the two masses.

Thanks, I actually missed it

The amplifier moved after the mass connection. I am writing to everyone for help, I close the topic.