Sharp XV-Z12000 (serv.man12) Service Manual ▷ View online
51
XV-Z12000
Select the video signal type.
Supply an NTSC3.58 VIDEO
signal to INPUT4.
signal to INPUT4.
Select INPUT4 using the key on
the main unit or the remote control.
the main unit or the remote control.
YES
NO
Is the color normal?
Is the image frame normal?
Set the video signal system to
Auto and see if any abnormality
is present.
Auto and see if any abnormality
is present.
Go to "IC8338 peripheral check".
End.
Check the composite VIDEO
(CVBS) input.
(CVBS) input.
Supply an NTSC3.58 S-VIDEO
signal to INPUT3.
signal to INPUT3.
Select INPUT3 using the key on
the main unit or the remote control.
the main unit or the remote control.
Check the S-VIDEO input.
YES
NO
Is a projection image displayed?
Is the picture distorted?
Go to "Check the VIDEO
synchronization signal."
synchronization signal."
Select NTSC3.58 as the optional video
signal system on the menu display.
signal system on the menu display.
52
XV-Z12000
Is a clock signal (20.25 MHz)
present at TL8002?
present at TL8002?
NO
YES
Is a video signal present at pin
(74) of IC8338?
(74) of IC8338?
Check the peripherals of pin
(74) of IC8338.
The main unit is defective.
(74) of IC8338.
The main unit is defective.
IC8338 is defective.
Is a video signal present at pin
(73) of IC8338?
(73) of IC8338?
YES
Is a horizontal synchronization
signal present at TL8142?
signal present at TL8142?
The VIDEO synchronization
signal is normal.
signal is normal.
Is a vertical synchronization
signal present at TL8140?
signal present at TL8140?
Is the input signal composite
VIDEO (CVBS)?
VIDEO (CVBS)?
NO
Check the peripherals of pin
(73) of IC8338.
The main unit is defective.
(73) of IC8338.
The main unit is defective.
Is the input signal S-VIDEO?
Is a video signal present at pin
(72) of IC8338?
(72) of IC8338?
NO
Check the peripherals of pin
(72) of IC8338.
The main unit is defective.
(72) of IC8338.
The main unit is defective.
Check the VIDEO
synchronization signal.
synchronization signal.
YES
NO
YES
YES
YES
YES
NO
YES
Is a video signal present at
TL8138?
TL8138?
Is the input signal 525iRGB
(or component)?
(or component)?
IC8338 is defective.
NO
NO
X8006 or IC8338 is defective.
NO
NO
YES
YES
53
XV-Z12000
Is a clock signal (20.25 MHz)
present at TL8002?
present at TL8002?
Supply a RAMP signal to INPUT4,
and observe pins (31 - 40) of
IC8338 using an oscilloscope.
and observe pins (31 - 40) of
IC8338 using an oscilloscope.
Is a pulse present at pins (31 - 40)
of IC8338?
of IC8338?
IC8338 is defective.
IC8025 or after is defective.
IC8338 peripheral check
IC8338 is defective.
Supply a color bar signal to
INPUT4, and observe pins
(41 - 50) of IC8338.
INPUT4, and observe pins
(41 - 50) of IC8338.
Is a pulse present at pins
(41 - 50) of IC8338?
(41 - 50) of IC8338?
IC8338 is defective.
Is a clock signal present at
TL8004?
TL8004?
Check X8006, or IC8338 is
defective.
defective.
YES
NO
YES
NO
YES
NO
YES
NO
54
XV-Z12000
Check the input signal type.
Supply a PC-RGB analog signal
to INPUT5.
to INPUT5.
Select INPUT5 using the key on
the main unit or the remote
control.
the main unit or the remote
control.
NO
YES
Is an RGB signal present at pins
(126), (136), and (141) of IC8004?
(126), (136), and (141) of IC8004?
Is a vertical synchronization signal
present at pin (6) of IC8330?
present at pin (6) of IC8330?
Check in the vicinity of the DVI
connector.
connector.
IC8004 or after is defective.
Check the DVI analog input.
YES
NO
IC8330 or peripheral parts are
defective.
defective.
Is a horizontal synchronization
signal present at pin (6) of
IC8331?
signal present at pin (6) of
IC8331?
YES
NO
IC8331 or peripheral parts are
defective.
defective.
Is a synchronization signal
present at TL8130 and TL8131?
present at TL8130 and TL8131?
YES
NO
IC8330 is defective.
NO
YES
Is a projection image displayed?
End.
When checking the optional input
signal on the menu display, set it to "A.
RGB".
signal on the menu display, set it to "A.
RGB".
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