DOWNLOAD Sharp XG-NV21SE (serv.man4) Service Manual ↓ Size: 147.96 KB | Pages: 29 in PDF or view online for FREE

Model
XG-NV21SE (serv.man4)
Pages
29
Size
147.96 KB
Type
PDF
Document
Service Manual
Brand
Device
Projector / Resetting the total lamp timer, The optical unit outline, Covergence and focus adjustment, Electrical adjustment, Adjusting the PC board, Troubleshooting table - Page 15-43
File
xg-nv21se-sm4.pdf
Date
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35
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE 
(Continued)
Checkig the Power Unit
There is no voltage output at 
EA connector.
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
Is there any other output 
voltage failure?
Is EA connector disconnected 
or loose?
Is AC voltage (85-264V) 
applied across the PA 
connector?
Is R724 open?
Is there short-circuit between 
collector and emitter of Q702?
Reconnect the EA connector.
Replace F791.
Which output voltage line fails?
Replace R771.
Replace R755.
Replace Q702.
Replace PC702.
Replace IC701, IC702, T701 or 
R724.
4.5V
-7
36
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE 
(Continued)
Power on
Yes
No
Is the right input selected?
Select the right input with remote 
control.
Yes
No
Are the PC, video and LCP cables as 
specified and properly connected?
No
With the contrast control at maximum, 
does the image appear?
Use the right cables or reconnect the 
cables.
Readjust the video system.
Yes
No
Is the voltage at TC1 connector as 
specified?
Power circuit faulty.
Yes
Hook up a personal computer.
No
Does the image appear?
Go to "Checking the clock circuit and 
its peripheral circuits".
Yes
No
Is the image as specified?
Check the sync signal circuit and its 
peripheral  circuits.
Yes
No
Is the image's colour as specified?
Check the video circuit and its 
peripheral circuits.
Yes
No
Does the on-screen display function?
Go to "Checking the OSD circuit and 
its peripheral circuits".
Yes
No
Does the remote control function?
Go to "Checking the remote control".
Yes
End
A
37
XG-NV21SE
XG-NV21SM
XG-NV21SA
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?
Is the ballast cooling fan 
running?
Is DC 360V voltage applied at 
PL connector pins?
Is 2V or higher voltage applied 
between pins (1) and (2) of 
ballast's D connector?
Is power EA connector 
disconnected?
Check the power circuit.
Is the lamp out of socket?
Reconnect the 
lamp into socket.
Replace the 
lamp.
Reconnect the 
connector into socket.
Check the 
microprocessor circuit.
Replace the ballast.
38
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-1
Checking the clock circuit and its peripheral circuits
Yes
No
Is X8002 oscillating?
X8002 or its peripheral part faulty.
Yes
No
Is pin (3) of IC8001 oscillating?
No
Does pin (63) of IC8001 function?
C8288 or its peripheral part faulty.
IC8001 or its peripheral circuit faulty.
Yes
Check the sync signal circuit and its 
peripheral circuits.
No
Are there signals at pins (275) thru 
(277) of IC8025?
LCP circuitry faulty.
Yes
No
No
Are there signals at pins (141), (145), 
(148) and (150) of IC8020?
IC8025 or its peripheral circuit faulty.
Yes
Is the input having a resolution below 
S-VGA level or in the video mode?
Yes
Yes
No
Are there signals at pins (13), (14), 
(43) and (44) of TC2 connector?
IC8025 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (238) and 
(239) of IC8025?
IC8020 or its peripheral circuit faulty.
Go to "Checking the PLL circuit and 
its peripheral circuits".
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