Sharp XG-P20XE (serv.man14) Service Manual ▷ View online
41
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
TROUBLE SHOOTING TABLE
(Continued)
No audio output
Yes
No
Check the input, the switching circuit
of IC461 ~ IC464, and their peripheral
circuit.
of IC461 ~ IC464, and their peripheral
circuit.
Are there audio signal inputs at pins
(2) and (23) of IC331?
(2) and (23) of IC331?
Yes
No
Check the IC331 control voltage,and
its peripheral circuits.
its peripheral circuits.
Are there audio signal outputs at pins
(1) and (2) of P301?
(1) and (2) of P301?
Yes
No
Check IC302 and its peripheral
circuits.
circuits.
Are there audio signal outputs at pin
(4)(6) of IC302?
(4)(6) of IC302?
Check IC302 and its peripheral
circuits, and the SP connectors and
speakers.
circuits, and the SP connectors and
speakers.
If the voltage at pin (7) of IC302 is not
as specified, check Q7055, Q7054
and their peripheral circuits.
as specified, check Q7055, Q7054
and their peripheral circuits.
Checkig the Power Unit
There is no voltage output at
EA connector.
EA connector.
No
No
No
No
Yes
Yes
Yes
Yes
Is EA connector disconnected
or loose?
or loose?
Is TF701 broken?
Is R711 broken?
Is AC voltage (85-264V)
applied across the PA
connector?
applied across the PA
connector?
Reconnect the EA connector.
There is a short-circuit along
the EA output line. Using a
tester, check the resistance
between each voltage line and
the ground.
the EA output line. Using a
tester, check the resistance
between each voltage line and
the ground.
No
Replace F791.
Replace.
Replace R711,R713 or
Q701.
Q701.
42
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
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 SC8502
connector as specified?
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".
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
43
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
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
(2) of ballast's D connector?
applied between pins (1) and
(2) 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.
83
82
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
17
16
19
18
15
14
13
12
11
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
CHASSIS LAYOUT / CHASSIS-ANORDNUNG
Click on the first or last page to see other XG-P20XE (serv.man14) service manuals if exist.