5. TV without channel or less channel or interfered
YES NO
YES NO
6. Poor sound
YES NO
NO YES
Check TV antenna plug for looseness
and poor contact
Check whether the antenna plug or
its signal source with problem
Check the voltage of power supply(3.3V)
of tuner IC in normal or not
Poor sound refers to without sound or
tone or with noise; check whether the
selection of sound system is proper
TV with noise, check to see if other
audio inputs, such as HDMI, PC, and
so on
are normal
No sound, check whether the tone is minimal,
remote control mute, tone to see whether the
volume balance is set in the center
Other inputs have noise or no sound,
single tone check the public part of
power amplifier chip is not good
Other inputs are normal, only a source of no
sound or all are no sound, the relevant circuit is
no exception, use factory reset and restart, if
still have the phenomenon, replace the main
chips
Replace the 3.3V
transformed IC
AS1117L
Check silicon high frequency IC in
normal or related circuit is abnormal or
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