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5-8
Abnormal color of video picture
Yes
Abnormal color of
video
p
icture
Check whether the 3.3V
and 1.8V power supply
voltages on the decoder
board are normal.
Check Y2, R28, C31 and C33
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 out
p
ut si
g
nal
Trouble shooting chart
change U2
Yes
No
Check if the video signals on Pin
58,60,61,63 of U1 are normal.