Sharp XG-NV7XE (serv.man3) Service Manual ▷ View online
33
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
Checking IC6008 (3-D noise reduction circuit)
and its peripheral circuits
and its peripheral circuits
Yes
No
Check the buffer circuit of Q6001,
Q6003, Q6004, Q6006 and Q6007
as well as Q6009 and Q6010.
Q6003, Q6004, Q6006 and Q6007
as well as Q6009 and Q6010.
Yes
No
Are there signal outputs at pins (55)
(Y signal) and (51)(chroma signal) of
IC6008?
(Y signal) and (51)(chroma signal) of
IC6008?
Check IC6007, IC6010 (memory) and
their peripheral circuits.
their peripheral circuits.
Yes
No
Are there signal outputs at the
emitters of Q6013 (Y signal) and
Q6011 (chroma signal)?
emitters of Q6013 (Y signal) and
Q6011 (chroma signal)?
Check the low-pass circuit around
Q6011, Q6012 and Q6013.
Q6011, Q6012 and Q6013.
Check IC6009, IC6010 and IC801
(RGB signal output circuit).
(RGB signal output circuit).
Are there signal inputs at pins (40)
(Y signal) and (45)(chroma signal) of
IC6008?
(Y signal) and (45)(chroma signal) of
IC6008?
No color or unusual tone (NTSC, PAL)
Yes
No
Go back to the signal processing
block.
block.
Yes
No
Check the oscillation of X801 and
X802, and their peripheral circuits.
X802, and their peripheral circuits.
Check IC805, IC814 and their
peripheral circuits.
peripheral circuits.
Are there signal outputs at pins
(46)(R-Y) and (45)(B-Y) of IC801?
(46)(R-Y) and (45)(B-Y) of IC801?
Is there chroma signal input at pin
(20) of IC801?
(20) of IC801?
34
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
No or unusual Y signal
Yes
No
Go back to the signal processing
block.
block.
No
Check IC801 and its peripheral
circuits.
circuits.
Yes
No
Check IC805 and its peripheral
circuits as well as IC807 (AGC).
circuits as well as IC807 (AGC).
Yes
Check IC805 and its peripheral
circuits.
circuits.
Is there Y signal output at pin (17) of
IC805?
IC805?
Is there Y signal output at pin (40) of
IC801?
IC801?
Is there Y signal input at pin (21) of
IC801?
IC801?
No or unusual horizontal sync
Yes
No
Check IC801 and its peripheral
circuits.
circuits.
Yes
No
Is there horizontal sync pulse output
at pin (9) of IC803?
at pin (9) of IC803?
Check the pulse shaping circuit of
IC802 and IC803.
IC802 and IC803.
Go to "Trouble shooting table for PC
I/F unit".
I/F unit".
Is there horizontal sync pulse output
at pin (56) of IC801?
at pin (56) of IC801?
No or unusual vertical sync
No
Check IC801 and its peripheral
circuits.
circuits.
Yes
Go to "Trouble shooting table for
PC I/F unit".
PC I/F unit".
Is there vertical sync pulse output at
pin (4) of IC801?
pin (4) of IC801?
35
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
No audio output
Yes
No
Check the input, the switching circuit
of IC3301 and IC3302, and their
peripheral circuit.
of IC3301 and IC3302, and their
peripheral circuit.
Is there audio signal inputs at pin (2)
of IC302?
of IC302?
Yes
No
Check the IC5201 control voltage,
and its peripheral circuits.
and its peripheral circuits.
Is there audio signal outputs at pin (7)
of IC302?
of IC302?
Yes
No
Check IC301 and its peripheral
circuits.
circuits.
Is there audio signal outputs at pin (6)
of IC301?
of IC301?
Check IC301 and its peripheral
circuits, and the SP connectors and
speakers.
circuits, and the SP connectors and
speakers.
If the voltage at pin (7) of IC301 is
not as specified, check Q302, Q303
and their peripheral circuits.
not as specified, check Q302, Q303
and their peripheral circuits.
Checkig the Power Unit
There are no voltage output at
PA and PB connector.
PA and PB connector.
No
No
No
Yes
Yes
Are PA and PB connector
disconnected or loose?
disconnected or loose?
Reconnect the PA and PB
connector.
connector.
Replace AC Power Switch
(QCNW-5413 CEZZ).
(QCNW-5413 CEZZ).
Replace Power Unit.
Are AC power switch
(QCNW-5413CEZZ) and
bimetal nomal?
(QCNW-5413CEZZ) and
bimetal nomal?
36
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
Power on
Yes
No
Is the right input selected?
Select the right input with remote
control.
control.
Yes
No
Are the PC, video and LCP cables as
specified and properly connected?
specified and properly connected?
No
With the contrast control at maximum,
does the image appear?
does the image appear?
Use the right cables or reconnect the
cables.
cables.
Readjust the video system.
Yes
No
Is the voltage at PA and PB
connectors as specified?
connectors as specified?
Power circuit faulty.
Yes
No
Does the image appear?
Go to "Checking the clock circuit and
its peripheral circuits".
its peripheral circuits".
Yes
No
Is the image as specified?
Check the sync signal circuit and its
peripheral circuits.
peripheral circuits.
Yes
No
Is the image's colour as specified?
Check the video circuit and its
peripheral circuits.
peripheral circuits.
Yes
No
Does the on-screen display function?
Go to "Checking the OSD circuit and
its peripheral circuits".
its peripheral circuits".
Yes
No
Does the remote control function?
Go to "Checking the remote control".
Yes
End
A
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