Sharp XG-NV6XE (serv.man4) Service Manual ▷ View online
41
XG-NV6XE
TROUBLE SHOOTING TABLE
(Continued)
Lamp fails to light-up
Yes
Yes
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Turn on the power switch. Is
discharging sound heard from
the lamp?
discharging sound heard from
the lamp?
Is the ballast cooling fan
running?
running?
Is DC 360V voltage applied
between PL connector pins?
between PL connector pins?
Is 3.5V or higher voltage
applied between pins (1) and
(3) of ballast's D connector?
applied between pins (1) and
(3) of ballast's D connector?
Is power EA connector
disconnected?
disconnected?
Check the power circuit.
Is the lamp out of socket?
Reconnect the
lamp into socket.
lamp into socket.
Replace the
lamp.
lamp.
Reconnect the
connector into socket.
connector into socket.
Check the
microcomputer circuit.
microcomputer circuit.
Replace the ballast.
42
XG-NV6XE
Checking the clock circuit and its peripheral circuits
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Is X8001 (6MHz) oscillating?
X8001 or its peripheral part faulty.
No
No
Is X8002 (32.768kHz) oscillating?
X8002 or its peripheral part faulty.
No
Is X8004 (22.165MHz) oscillating?
X8004 or its peripheral part faulty.
No
Is X8005 (16.25MHz) oscillating?
X8005 or its peripheral part faulty.
Is X8003 (1.84MHz) oscillating?
No
Does pin (162) of IC8001 function?
X8003 or its peripheral part faulty.
IC8001 or its peripheral circuit faulty.
Check the sync signal circuit and its
peripheral circuits.
peripheral circuits.
Yes
No
Are there signals at pins (46), (49)
and (50) of P8404 (or TP5 and TP4)?
and (50) of P8404 (or TP5 and TP4)?
LCP circuitry faulty.
No
Is the signal a sync on green signal?
No
No
No
Are there signals at pin (7) of IC8036?
IC8023, IC8034, IC8036 or its
peripheral circuit faulty.
peripheral circuit faulty.
No
Are there signals at pins (149) and
(150) of IC8020 (TL34, 35)?
(150) of IC8020 (TL34, 35)?
IC8025 or its peripheral circuit faulty.
Is the input having a resolution below
XGA level or in the video mode?
XGA level or in the video mode?
Yes
No
Are there signals at pins (14), (16) and
(18) of P8405 connector?
(18) of P8405 connector?
IC8029 or its peripheral circuit faulty.
IC8025 or its peripheral circuit faulty.
IC8029 or its peripheral circuit faulty.
No
No
No
Are there signals at pins (26), (28) and
(29) of IC8020 (TL43,TL41,TL42)?
(29) of IC8020 (TL43,TL41,TL42)?
IC8020 or its peripheral circuit faulty.
Are there signals at TL22, TL25,
TL27?
TL27?
Are there signals at TP6 and TP7?
Go to "Checking the PLL circuit and
its peripheral circuits".
its peripheral circuits".
Is the sync signal of H/V separate
type?
type?
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-1
43
XG-NV6XE
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-2
Checking the PLL circuit and its peripheral circuits
Yes
No
Are there signals at pins (6) and (22)
of IC8015?
of IC8015?
IC8025 or its peripheral circuit faulty.
Yes
No
Is there signal at pins (18) and (19)
of IC8015?
of IC8015?
IC8015 or its peripheral circuit faulty.
Check the video circuit and its
peripheral circuits.
peripheral circuits.
No
Is image as specified at resolution
above XGA level?
above XGA level?
Check the SXGA video circuit and
its peripheral circuits.
its peripheral circuits.
Yes
No
Is image as specified at resolution
below XGA level?
below XGA level?
Check the VGA video circuit and its
peripheral circuits.
peripheral circuits.
Yes
No
Hook up a video system. Is the
display as specified?
display as specified?
Check the video system's video
circuit and its peripheral circuits.
circuit and its peripheral circuits.
Yes
A
44
XG-NV6XE
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-3
Yes
Yes
No
No
Is there signal at pin (13) of IC8004
(or pin (6) of IC8067)?
(or pin (6) of IC8067)?
Is there signal at pin (13) of IC8004
(or pin (6) of IC8067)?
(or pin (6) of IC8067)?
Output PWB faulty.
B
B
Yes
Yes
No
No
Is there signal at the base of Q8009?
Is there signal at the base of Q8009?
IC8004 (or IC8067) or its peripheral
circuit faulty.
circuit faulty.
Yes
Yes
Yes
No
No
Is there signal at pin (6) of IC8011
Yes
Are there signals at TL44 and TL46?
Is there signal at pin (6) of IC8011?
Q8008 and Q8009 or there peripheral
circuit faulty.
circuit faulty.
Yes
Yes
No
No
No
Are there signals at pins (21) thru (27)
and (33) thru (40) of IC8011?
and (33) thru (40) of IC8011?
Are there signals at pins (21) thru (27)
and (33) thru (40) of IC8011?
and (33) thru (40) of IC8011?
Are there signals at pins (112) thru
(119) of IC8020?
(119) of IC8020?
IC8011 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (69) thru (73)
and (189) thru (192) of IC8020?
and (189) thru (192) of IC8020?
IC8020 or its peripheral circuit faulty.
Yes
Yes
No
Are there signals at pins (9) and (10)
of P8405 connector?
of P8405 connector?
Are there signals at pins (1) thru (10)
of IC8051?
of IC8051?
IC8051 or its peripheral circuit faulty.
No
IC8029 or its peripheral circuit faulty.
No
IC8025 or its peripheral circuit faulty.
P8405 connector or output PWB
faulty.
faulty.
Checking the
SXGA's red video
circuit and its
peripheral circuits
SXGA's red video
circuit and its
peripheral circuits
Checking the VGA's
red video circuit and
its peripheral
circuits
red video circuit and
its peripheral
circuits
Yes
No
Are there signals at pins (35) thru (42)
of P8404 connector?
of P8404 connector?
Check the video
system's red video
circuit and its
peripheral circuits
system's red video
circuit and its
peripheral circuits
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