BenQ T201WA, Service Manual

Page: 52 / 59

A-5.) Audio block diagram:
Fig.1
The audio block consists of an audio board and dual speaker drivers. The speaker drivers are
using 35 x 16mm (rated 1.5W/CH) with DC volume control, power is supplied by power board
and audio input is from PC audio output (Line Out).
1. Audio Power Amplifier IC:
Use ANPEC POWER IC APA2069 which is stereo ClassAB BTL output amplifiers with
DC volume control. The devices are designed for use in TV and monitor. Use +5V from
power board and connect speaker drivers to offer 1W/CH.
2. DC Power Input:
To 5V for Amplifier IC APA2069 power source.
3. Audio Input:
Connect with PC audio output
in 3.5mm to 3.5mm signal line
.
4. Speaker driver:
Use 8 ohm / 35 x 16mm speaker driver (rated 1.5W/CH).
5. DC Volume Control:
The control voltage range is 0 ~ 3.3V (from MCU).
Audio IC
APA2069
DC volume
control
Speaker
Mute
Enable/Disable
Audio in
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