Sharp XG-C68X (serv.man4) Service Manual ▷ View online
41
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT
Checking of PC I/F UNIT
Check the video input.
Check the component input.
Check the RGB input.
Is the user menu displayed
onscreen?
onscreen?
End
Check the onscreen display.
No
Yes
Yes
Yes
Yes
0
TROUBLE SHOOTING TABLE (Continued)
No
No
No
Yes
Yes
Yes
Checking the RGB Sync.
Are the sync inputted into pins(2)
and (4) of SC3102?
and (4) of SC3102?
Are their signal inputted into pins(2)
and (12) of IC2404?
and (12) of IC2404?
Are their signal inputted into
pins(63) and (66) of P8002?
pins(63) and (66) of P8002?
Go to "Checking the PC I/F unit".
Check IC3152, IC3153, IC3154,
IC3151 and their peripheral circuits.
IC3151 and their peripheral circuits.
Check P3102 and its peripheral
circuits.
circuits.
Check IC2404 and its peripheral
circuits.
circuits.
42
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
Is the STEP signal as specified?
Select the STEP signal.
Is the onscreen display color
normal?
normal?
No problem with the onscreen
display.
display.
In the process mode, make the
LCD line adjustment.
LCD line adjustment.
Is the user menu displayed
onscreen normally by the MENU
key?
onscreen normally by the MENU
key?
Is the signal compatible with the
STEP signal outputted at TL106
thru TL111?
STEP signal outputted at TL106
thru TL111?
Enter the process menu and select
PATTERN. Then select the COLOR
pattern.
PATTERN. Then select the COLOR
pattern.
No
Yes
No
Yes
Go to "Checking of GA4 and Its
Periphery".
Periphery".
Yes
Rewrite the onscreen display data.
No
Checking of Onscreen Display
0
Rewrite the onscreen display data.
Yes
IC8025 is defective.
No
0
43
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
Yes
No
Yes
1
2
3
No
Yes
Checking of RGB Input
Feed the sync separation type
analog RGB signal to INPUT1.
analog RGB signal to INPUT1.
Select INPUT1 using the set’s key
or the remote controller.
or the remote controller.
Does the picture appear?
Go to "Confirmation of Video
Input".
Input".
Is the picture disturbed?
Go to "Checking of Sync Signal".
No
Go to "Checking of RGB Signal".
No
Yes
IC8013, IC8025 or their periphery
is defective.
is defective.
Do the three colors R, G and B
appear?
appear?
Carry out the AUTOSYNC process.
Yes
Is the contour of picture clear?
No
Is there any disturbance in the
vertical stripe pattern?
vertical stripe pattern?
End
44
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
IC8025 or IC8013 is defective.
Go to "Checking of Sync Signal".
Is there the signal at pin (55) of
SC8002 (B-to-B connector)?
SC8002 (B-to-B connector)?
Somewhere in the signal route is
defective. Check the capacitors
and resistors between SC8002
and IC8013.
defective. Check the capacitors
and resistors between SC8002
and IC8013.
Make "Confirmation of Input
Signal Setting".
Signal Setting".
Is there the video signal at the land
of C8070?
of C8070?
Yes
No
Yes
Confirmation of Video Input
The signal source or connector is
defective.
defective.
End
Is the right item selected from input
menu?
menu?
Are the connectors connected
correctly?
correctly?
Yes
No
Yes
Confirmation of Input Signal
Setting
Setting
Select the right item.
2
No
Connect the connectors correctly.
1
No
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