Q7C3 LCD Monitor Service Guide
Circuit Operation Theory
7
#7.Audio Speaker:
DC POWER
INPUT
POWER IC
TDA7496
AUDIO
INPUT
Connect with
8 ohm/2W
Speaker
Connect with
PC Audio output
The Audio Speaker is consisting of an Audio board. The Audio Speaker has DC Volume control,
use 28mmX40mm Speaker (2W/per channel), power supply from AC-DC board and Audio input from PC
Audio output (Line Out).
(A) Power IC:
Use ST POWER IC TDA7496.The IC are stereo Class AB output amplifiers with DC
Volume control. The devices are designed for use in TV and monitor, but are also suitable for battery-
Fed portable recorders and radios. Use +15V from AC-DC Board and connect speaker to offer 1W per
channel.
(B)DC Power Input:
To 15V to be VCC source Voltage for TDA7496 and built-in AC-DC board.
(C) Audio Input:
connect with PC Audio output in 3.5mm to 3.5mm signal line.
(D) Speaker:
Use 8 ohm and 28mmX40mm speaker (2W/per channel)
(E) DC Volume Control:
The voltage range is 1 – 3.3 V (From MC)
