JVC HR-XV45SEF Service Manual page 50

5.1.6 Tuner/IF CIRCUIT
(A) No Picture on the TV screen
No picture on the TV
screen
YES
Does the Video signal at
the TU701 Pin19.
YES
Does Sync appear at
IC501 Pin111.
YES
Does the Video signal at
the IC501 Pin47.
YES
Does the Video signal at
the IC301 Pin61.
YES
Does the Video signal at
the IC903 Pin6.
YES
Check the signal flow from IC903
Pins26, 27 to SC901 Pin19.
1-50 (No.YD070)
NO
Is 33VT applied to TU701
Pin17?
YES
Is 5VT applied to TU701
Pin4?
YES
Does the Clock signal
appear at TU701 Pin12?
YES
Does the data signal
appear at TU701 Pin13?
YES
Replace Tuner.
NO
Check the signal flow from
TU701 Pin19 to IC301 Pin48.
NO
Check the signal from IC301
Pin65 to IC501 Pin49.
NO
Check the signal from IC501
Pin47 to IC301 Pin56.
NO
Check the signal from IC903
Pin6 to IC301 Pin61.
NO
Check 33V line.
NO
Check 5V line.
NO
Check the lIC Clock Signal
of -COM Pin18.
NO
Check the lIC Data Signal
of -COM Pin17.