Tuner/If Circuit - Philips DVDR3320V/01 Service Manual

VCR ELECTRICAL TROUBLESHOOTING GUIDE

6. Tuner/IF CIRCUIT

(1) No Picture on the TV screen
No picture on the TV
screen
Does the Video signal
appear at TU701 Pin19.
YES
Does the video signal
appear at IC802 Pin28.
YES
Does the Video signal at
the IC802 Pin31.
YES
Does the Video signal at
the IC301 Pin15.
YES
Does the Video signal at
the IC301 Pin29.
YES
Does the video signal at
the PMD02 Pin5?
YES
Does the Video signal at
the IC802 Pin 29.
YES
Does the Video signal at
the IC901 Pin 23.
YES
Check the Pattern between IC901
Pin23 with SC901 Pin19
NO
Is 33V applied to TU701
Pin17?
Is +5V applied to TU701
Pin4?
Does the Clock signal
appear at TU701 Pin12?
Does the data signal
appear at TU701 Pin13?
Replace Tuner.
NO
Check the Pattern between
TU701 Pin19 and IC802 Pin28.
NO
Replace the IC802.
NO
Check the Pattern between
IC802 Pin31 and IC301 Pin15.
NO
Replace the IC301.
NO
Check the DVD Board
Video Path.
NO
Replace the IC802.
NO
Replace the IC901.
3-19
NO
YES
NO
YES
NO
YES
YES
Check 33V line.
Check 5V line.
Check the llC Clock Signal
of µ-COM Pin18.
Check the llC Data Signal
of µ-COM Pin17.