ViewSonic VS10848-1M Service Manual page 14

viii.
AUDIO AMP MUTE ON/OFF
The control signal of AMP MUT was outputed from MUTE1 and MUTE2 I/O port of PW2000. MUTE2 will
control the RC JACK Audio Output Mute. (For preventing from abnormal sound occurred when turn on TV
set, Audio Amp Mute will act in first and last procedure)
ix.
x. THE THREE BIRDS LOGO
The ViewSonic Logo will show up in 5 seconds after program execution, then disappeared. All the
POWER ON procedure will be finished when AMP Relay sound be heard and screen displayed.
POWER OFF Mode ：
D.
i. After POWER ON procedure finished, the signal of Keypad and remote control will transform to
PW2000 for further processing. U48 chip did not handle the signal of Keypad and remote control
any more. When the system receives the power off order by Power Key of remote control or Power
ON/OFF of the keypad. Firstly PW2000 will send current screen status to memory U38 via I2C bus,
then the PWRDOWN I/O port of PW2000 will send a Hi signal to U48 closing the Switching
power.
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