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(2)
with sound but no picture
Check
backlight is light
Yes
LVDS power supply
of C415 is normal?
No
N403
and
periphery
problem
Yes
Problem lies in LVDS
wire or panel
(3)
with picture but no sound
a) MP7722
If
audio
output (if X13 has wave)
No
If sound processing IC has
output (C116,C117)
No
Sound processing IC N03 and
its periphery has problem
No
if
Check the power
supply of backlight
Yes
XB12 3# switch level is abnormal
(such as shortage)
its
If X403 has LVDS wave
has
output
amplifier
has
Yes
No
Speaker damaged
Audio amplifier and the circuit
has problem. Check the power
supply, 6# MUTE, 14#,19#
42
No backlight power supply
output or short to the ground
No
Main
CPU
LVDS have problem
NS02
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