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