Sanyo LCD-37XR8DA, Service Manual

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23
2.3 Picture, but no sound
Check if NV02 pin4,
5, 32, 33 are 24V?
Check 24V power
supply of power
board and the path
between XV03 and
NV02 on main board
Is there sound in
earphone?
Is there sound when
touch CV04, CV05
with probe?
Check earphone
amplify circuit
Replace
NV02
Check the
audio output
circuit of the
main IC
no
yes
no
yes
yes
yes
no
Check if NV02
pin10, 27 are high
voltage?
If NS01 pin126, 148
are low voltage?
no
Check the path
between NS01 pin
126,148 and
NV02 pin10, 27
Replace NS01