Tuner/If Circuit - Philips DVP3350V/01 Service Manual

VCR ELECTRICAL TROUBLESHOOTING GUIDE

6. TUNER/IF CIRCUIT

6-1. 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.
Is 33VT
NO
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.
3-17
NO
Check 33V line.
NO
Check 5V line.
NO
Check the lIC Clock
Signal of µ-COM Pin18.
NO Check the lIC Data
Signal of µ-COM Pin17.