Sharp XG-NV7XE (serv.man3) Service Manual ▷ View online
29
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
Checking the PWB performance
RGB input in trouble
Feed test pattern signal from
PC.
PC.
Yes
No
Use specified cable.
Is specified cable connected
between PC and projector?
between PC and projector?
Yes
No
Power circuit in trouble.
Is supply voltage as specified?
Yes
No
Check the connectors, starting
from the PC input circuit.
from the PC input circuit.
Does image appear?
Video input in trouble
Go to "Checking the video unit
circuit".
circuit".
Remote control in trouble
Go to "Checking the remote
control".
control".
Go to "Trouble shooting table
for PC I/F unit ".
for PC I/F unit ".
30
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
Checking the video system
Yes
No
Go to "Lamp fails to light-up".
Yes
No
Are specified voltage fed to PA and
PB connectors?
PB connectors?
Check the power circuit and its parts.
Yes
No
Are there signal inputs at pins (12),
(13) and (17) of SC302?
(13) and (17) of SC302?
Is there signal at pin (4) of IC6001?
Are there signal outputs at pins (7) of
IC6006 and (5) of IC6009?
IC6006 and (5) of IC6009?
Yes
Check the video unit circuit
(IC4501 and IC4001 and its
peripheral circuits).
(IC4501 and IC4001 and its
peripheral circuits).
No
Check the oscillation circuit
of IC6001, and their
peripheral circuits.
of IC6001, and their
peripheral circuits.
Yes
Go to "Checking IC801
(RGB signal output circuit)".
(RGB signal output circuit)".
No
Check IC6008, IC6006,
IC6009 and their peripheral
circuits as well as switching
circuit.
IC6009 and their peripheral
circuits as well as switching
circuit.
Is the lamp on?
31
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
Checking the Video unit circuit
Yes
No
Check the IC3401 selector switch,
terminal voltage and input circuit.
terminal voltage and input circuit.
Yes
No
Is there video signal input at IC4001?
Check the low-pass and buffer
circuits of Q4002 thru Q4005.
circuits of Q4002 thru Q4005.
Yes
No
Are there signal outputs at pins (6)
and (8) of IC4001?
and (8) of IC4001?
Check IC4001 and its peripheral
circuits (bias).
circuits (bias).
Yes
No
Check the low-pass and buffer circuits
of Q4004 thru Q4008. Is the signal as
specified?
of Q4004 thru Q4008. Is the signal as
specified?
Go to "Checking IC801 (RGB signal
output circuit)".
output circuit)".
Is there video signal output at pin (7)
of IC3401?
of IC3401?
Check Q4004 thru Q4008 and their
peripheral circuits.
peripheral circuits.
32
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
Checking IC801 (RGB signal output circuit)
Yes
No
Check the data transfer and other
performance at pins (17) and (18) of
video IC801.
performance at pins (17) and (18) of
video IC801.
No
Go to "No color or unusual tone",
"No Y signal" or "Out of sync".
"No Y signal" or "Out of sync".
Yes
No
Are there output waveforms at pin
(1) of IC6803, IC6804, IC6805?
(1) of IC6803, IC6804, IC6805?
Check IC6802, IC6803, IC6804,
IC6805 and their peripheral circuits.
IC6805 and their peripheral circuits.
No
Are A/D outputs of IC6805, IC6806
and IC6807 as specified?
and IC6807 as specified?
Check the CLK IC6805, IC6806,
IC6807 and their peripheral circuits.
IC6807 and their peripheral circuits.
Yes
Are there RGB output waveforms at
pins (31), (32) and (33) of IC801?
pins (31), (32) and (33) of IC801?
Checking the chroma and Y signals of IC801
(RGB signal output)
(RGB signal output)
Yes
No
Go to "Checking the video unit
circuit".
circuit".
Yes
No
Check the IC6009 and IC6010
switching and their peripheral circuits. If
there is no signal at pins (1) of IC6010
and pin (16) of IC6009 check 3-D noise
reduction circuit (IC8001).
switching and their peripheral circuits. If
there is no signal at pins (1) of IC6010
and pin (16) of IC6009 check 3-D noise
reduction circuit (IC8001).
No
Are there signal inputs at pins (20)
(chroma signal) and (21) (Y signal)
of IC801?
(chroma signal) and (21) (Y signal)
of IC801?
Check IC801 and its peripheral
circuits.
circuits.
Check IC806 (3-D noise reduction
circuit) and its peripheral circuits.
circuit) and its peripheral circuits.
Go to "Checking IC801 (RGB signal
output circuit)".
output circuit)".
Yes
Are there signal inputs at pins (7), (9)
and (25) of SC401?
and (25) of SC401?
Are there output waveforms at pins
(7) of IC6010 (chroma signal) and
(5), (Y signal)of IC6009?
(7) of IC6010 (chroma signal) and
(5), (Y signal)of IC6009?
Go to "Trouble shooting table for PC
I/F unit".
I/F unit".
Click on the first or last page to see other XG-NV7XE (serv.man3) service manuals if exist.