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Abnormal color of video picture
Check whether the 27MHz
output signal normal.
Check whether the 3.3V
and 1.8V power supply
voltages on the decoder
board are normal.
Check if the video signals on Pin
147,149,151,152,154 of U1 are normal
Abnormal color of
video picture
Yes
Yes
Yes
Check whether the
video filter network
circuit is normal.
Yes
1-8
No
Check Y1, R13, C38 and C39
Check other of power supply electric
No
circuit
No
Correct the connection
No
Trouble shooting chart
change U1
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