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Abnormal color of video picture
Check whether the 27MHz
output signal is normal.
Check whether the 3.3V
and 2.5V power supply
voltages on the decoder
board are normal.
Replace U3 or U9、U7
Abnormal color of
video picture
Yes
Yes
Yes
Check whether the
video filter network
circuit is normal.
Yes
4-7
No
Check XT1, R56, C48 and C49
Check other of power supply electric
No
circuit
No
Correct the connection
Trouble shooting chart
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