Table of Contents
Advertisement
2.3. Have picture, but no sound
Check if the relevant pins of the
sound amplifier have square
wave output?
yes
Check
the
back-circuit of the
sound amplifier
Check the peripheral
circuit,
crystal
power supply of N304.
Check if X203 on main
board has signal output?
no
no
Check
if
amplifier has signal input
through R201, R202?
no
Check if N304 has
signal input?
yes
no
Follow the sound signal
and
input channel and check
each level circuit
yes
The speaker has problem.
the
sound
yes
Check the peripheral circuit,
power supply and MUTE of the
sound amplifier.
23
Advertisement
Table of Contents
