Philips MDV434/55/77 Service Manual page 18

Abnormal color of video picture
Abnormal color of
video picture
Yes
Check
27MHz output signal is
Yes
Check whether the 3.3V
and 2.5V power supply
voltages on the decoder
board are normal.
Check whether the
video filter network
circuit is normal.
Check if the Y1 to Y6 signals on Pin164
to Pin 173 of U3 are normal
whether the
Yes
Yes
4-8
No
Check Y1, R56, R56, C39 and C40
No
Check other of power supply electric
circuit
No
Correct the connection
No
change U3 or U14、U15
Trouble shooting chart