Tuner/If Circuit - Sanyo VHR-M262EV Service Manual

5. Tuner/IF circuit

(1) No picture on the TV screen
No picture on the
TV screen
YES
Does the Video signal at
the TU701 Pin24?
YES
Does Sync appear at
IC501 Pin111?
YES
Check the signal flow from
IC501 Pin19 to JK901
Pin19.
NO
Is +30VT applied to
TU701 Pin 16?
Is +5VT applied to
TU701 Pin 13?
Does the Clock signal
appear at TU701 Pin 11?
Does the data signal
appear at TU701 Pin 12?
Replace Tuner
Check the signal flow
NO
from TU701 Pin 24 to
IC301 Pin 67.
3-16
NO
YES
NO
YES
NO
YES
NO
YES
Check 33VT line.
Check 5VT line.
Check the liC Clock
signal of µ-com Pin 59.
Check the liC Data signal
of µ-com Pin 60.