Sharp XG-P25XE (serv.man12) Service Manual ▷ View online
XG-P25X
44
TROUBLE SHOOTING TABLE FOR PC I/F UNIT
0
Is the user menu
displayed onscreen?
Check the onscreen
display.
Check the basic signal flow. The
component signals and video signals flow
in the same way from CVIC IC to DAC
OUT. So there is no need to check the
lines after the CVIC IC.
component signals and video signals flow
in the same way from CVIC IC to DAC
OUT. So there is no need to check the
lines after the CVIC IC.
The component input signals flow through
the same circuitry as for the RGB input
signals. Check the SOG (Sync On Green)
circuit and the color correction circuit.
the same circuitry as for the RGB input
signals. Check the SOG (Sync On Green)
circuit and the color correction circuit.
The video input signals flow into the CVIC
IC through a different route from the RGB
input signals. Therefore check the video-
signal DAC and PLL IC.
IC through a different route from the RGB
input signals. Therefore check the video-
signal DAC and PLL IC.
Check the DVI digital as well as analog
input signals.
input signals.
Check the RGB input.
Check the component
input signals.
Check the video input
signals.
Check the DVI input
signals.
End.
Checking the PC PWB
YES
NO
XG-P25X
45
TROUBLE SHOOTING TABLE FOR PC I/F UNIT
(Continued)
Feed the sync-pulse-
separated RGB signals to the
INPUT1 or INPUT2 terminal.
separated RGB signals to the
INPUT1 or INPUT2 terminal.
Using the control panel key or
the remote controller, select
INPUT1 or INPUT2.
the remote controller, select
INPUT1 or INPUT2.
Checking the RGB input
Activate the AUTOSYNC
function.
function.
Does the image appear?
Check the video input
signals.
signals.
Check the sync signals.
Check the RGB signals.
Is the image distorted?
Are the R, G and B colors as
specified?
specified?
Is the image contour as
specified?
specified?
Is there any distortion in the
vertical stripe pattern?
vertical stripe pattern?
IC8004 or its peripheral
parts defective.
parts defective.
End.
1
2
3
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
XG-P25X
46
TROUBLE SHOOTING TABLE FOR PC I/F UNIT
(Continued)
Make the right
choice.
choice.
Reconnect the
connector as
specified.
connector as
specified.
Checking the video input
Check the input signal
settings.
settings.
Is there the video signal at
the land of C8077?
the land of C8077?
Input PWB defective.
Check the sync signals.
IC8025 or IC8004 defective.
Checking the input signal
settings
settings
Is the input menu selected
as specified?
as specified?
Is the connector tightly
connected?
connected?
End.
NO
NO
NO
YES
YES
YES
2
1
XG-P25X
47
TROUBLE SHOOTING TABLE FOR PC I/F UNIT
(Continued)
Readjust the signal
source settings.
source settings.
Checking the sync signals
Is there the vertical sync
signal at TL8134?
signal at TL8134?
Is there the horizontal sync
signal at TL8133?
signal at TL8133?
Check the input
signal settings.
signal settings.
Input PWB defective.
Is there the vertical sync
signal at TL8131?
signal at TL8131?
Is there the horizontal sync
signal at TL8130?
signal at TL8130?
IC8302, IC8325, IC8299
or their peripheral parts
defective.
or their peripheral parts
defective.
Are both the vertical and
horizontal sync signals in
good sync?
horizontal sync signals in
good sync?
Is the signal generator
(source) as specified?
(source) as specified?
Input PWB defective.
The sync signals are
okay. End.
okay. End.
2
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
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