Abnormal color of video picture
Check
27MHz output signal
Check whether the 3.3V
and 1.2V power supply
voltages on the decoder
board are normal.
Check if the video signals on Pin
69,73,74,75, of U1 are normal
Abnormal color of
video picture
Yes
whether
the
Yes
Yes
Check whether the
video filter network
circuit is normal.
Yes
4-8
No
Check Y1, R10,R11,C10 and C11
No
Check other of power supply electric
circuit
No
Correct the connection
No
change U1
Trouble shooting chart