XOCECO LC-42HW36, Руководство по обслуживанию

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3. With sound but no picture (has backlight)
4. With picture but no sound
Check if the main board X111 output signal
Check if the corresponding pin of the sound
power amplifier output square ware
Speaker damaged
Check the periphery circuit of
the power amplifier backend
Check each level of circuit following
input audio signal channel.
No Yes
No Yes
With sound and raster
Check if the signal output form
NS01 to XS01 is normal Check if pin 2,4
is low voltage?
Abnormal Normal
Check if LVDS power supply is normal?
LVDS receiver
board has problem Check NS01 power
supply and its periphery
Abnormal
Normal
Check N402
Check N801 71#
and its invert circuit
No
Yes
Check if R162, R165 input
signal to the power amplifier
Check if N103 has signal input
No Yes
Check the periphery circuit of the power
amplifier, power supply and MUTE circuit
Check the periphery circuit of
N103, crystal and power supply
No Yes