Zenith XBV613 Service Manual - Page 28
Tuner/IF CIRCUIT
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UPC - 719192169715
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7. Tuner/IF CIRCUIT (1) No Picture on the TV screen No picture on the TV screen YES Does the Video signal at NO the TU701 Pin16. YES Is +33V applied to TU701 NO Pin14? YES Is +5V applied to TU701 NO Pin3? YES Does the Clock signal NO appear at TU701 Pin9? YES Does the data signal NO appear at TU701 Pin10? YES Replace Tuner. Check 33V line. Check 5V line. Check the lIC Clock Signal of µ-COM Pin71. Check the lIC Data Signal of µ-COM Pin72. Does the Video signal NO appear at IC501 Pin 52. YES Does the Video signal NO appear at JK901 YES Check the signal flow from IC501 Pin52 to JK901 Pin Video out. Check the signal from IC301 Pin29 to IC501 Pin50. Check the signal from IC501 Pin52 to Q924 3-17
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3-17
7. Tuner/IF CIRCUIT
(1) No Picture on the TV screen
No picture on the TV
screen
Does the Video signal at
the TU701 Pin16.
YES
YES
YES
Is +33V applied to TU701
Pin14?
YES
Is +5V applied to TU701
Pin3?
NO
Does the Video signal
appear at IC501 Pin 52.
NO
Does the Video signal
appear at JK901
YES
NO
Check the signal flow from IC501
Pin52 to JK901 Pin Video out.
YES
Check 33V line.
NO
Check 5V line.
NO
YES
Does the Clock signal
appear at TU701 Pin9?
Check the lIC Clock Signal
of μ-COM Pin71.
NO
YES
Does the data signal
appear at TU701 Pin10?
Replace Tuner.
Check the signal from IC301
Pin29 to IC501 Pin50.
Check the signal from IC501
Pin52 to Q924
Check the lIC Data Signal
of μ-COM Pin72.
NO