Sharp XG-C455W (serv.man5) Service Manual ▷ View online
XG-C455W/PG-C355W
5 – 1
XG-C455W
Service Manual
CHAPTER 5.
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
Checking the basic operation
Does the power LED light up or
flash in red or green?
flash in red or green?
NO
Has P1704 or P1705 come off or is it
loose?
loose?
YES
Fully insert the connector.
YES
No
Check the TEMP Fuse and BI-
METAL SW
METAL SW
Does the set function with its keys
or the remote controller?
or the remote controller?
NO
Go to "Main PWB check".
YES
Lamp does not turn on or it turns
off in a short time.
off in a short time.
YES
Go to "Lamp fails to light-up".
NO
Colors are not display correctly.
YES
Has SC1101, SC1201 or SC1301
come off or is it loose?
come off or is it loose?
YES
Fully insert the connector.
NO
Are RGB and component input
displayed normally?
displayed normally?
NO
Go to "RGB and component signal
check".
check".
YES
Is VIDEO input displayed nor-
mally?
mally?
NO
Go to "VIDEO input check".
YES
Is S-VIDEO input displayed nor-
mally?
mally?
NO
Go to "S-VIDEO input check".
YES
Does the LAN function?
NO
Go to “checking the LAN”.
YES
END
XG-C455W/PG-C355W
5 – 2
Main PWB check
Is 6 V applied to TL1711, 13 V to TL1712 and 17V to TL1727?
NO
Go to "Power supply ballast PWB check".
YES
Is approx. 5 V applied to TL1709?
NO
Check IC1710 and peripheral circuits.
YES
Is 1.8 V applied to TL1704?
NO
Check IC1702 and peripheral circuits.
YES
Is 3.3 V applied to TL1706?
NO
Check IC1704 and peripheral circuits.
YES
Is 1.2 V applied to TL1705?
NO
Check IC1706 and peripheral circuits.
YES
Is 5 V applied to TL1708?
NO
Check IC1707 and peripheral circuits.
YES
Is 3.3 V applied to TL1703?
NO
Check IC1708 and peripheral circuits.
YES
Is 15.5 V applied to TL1707?
NO
Check IC1705 and peripheral circuits.
YES
Is5 V applied to TL1701?
NO
Check IC1701 and peripheral circuits.
YES
Is 3.3V applied to TL1723, TL1734?
NO
Check IC1703, IC1713 and peripheral circuits.
YES
Is 3.3V applied to TL2002?
NO
Check IC2002, IC2003, IC2004 and IC2005 and periph-
eral circuits.
eral circuits.
YES
Is 0 V applied to pin(2) of S2701?
NO
Check that it is set to the NORMAL side. Or remove
S2701.
S2701.
YES
Is rectangular wave of 27 MHz sent to TL2004?
NO
Check X2002 and peripheral circuits.
YES
Is 0.9V applied to pin(8) of IC2106?
NO
Check IC2106, Q2103 and peripheral circuits.
YES
Check IC2001, IC2101, IC2102, IC2103, IC2104, IC2202 and periph-
eral circuits.
eral circuits.
XG-C455W/PG-C355W
5 – 3
Lamp fails to light-up
Turn on the power switch.
Is discharging sound heard
from lamp?
Is discharging sound heard
from lamp?
YES
Is the lamp out of
socket?
socket?
YES
Reconnect the lamp into
socket.
socket.
NO
NO
Replace the lamp.
Is the ballast cooling fan running?
YES
Check the cooling fan cir-
cuits.
cuits.
NO
Does the power LED
flash red in 0.5 second
interval?
flash red in 0.5 second
interval?
YES
Check the “RCS” signal.
(Air filter cover/Lamp door/
Lens door)
(Air filter cover/Lamp door/
Lens door)
NO
Is the DC voltage of 380V applied to pin(1) of P702 connector?
NO
Check the power supply cir-
cuits.
cuits.
YES
Is LOW LEVEL voltage
applied between pins(3)
and (4) of Main's P1702
connector?
applied between pins(3)
and (4) of Main's P1702
connector?
NO
Is the P1702 connector
disconnect?
disconnect?
NO
The lamp light-up. After
about 30 seconds, the
TEMP LED flash red and
the lamp turn off.
about 30 seconds, the
TEMP LED flash red and
the lamp turn off.
YES
Check the TEMP1,
TEMP2 and TEMP0
signal line.
TEMP2 and TEMP0
signal line.
YES
YES
NO
Replace the ballast.
Reconnect it into
socket correctly.
socket correctly.
Check the microprocessor
and its peripheral circuits.
and its peripheral circuits.
XG-C455W/PG-C355W
5 – 4
Checking the power unit
There is no voltage output at P703?
NO
Check the Main PWB
unit.
unit.
YES
Is AC voltage (90-264V) applied across the
P801 connector?
P801 connector?
NO
Check the P801 or AC
Cord.
Cord.
YES
Is AC voltage (90-264V) applied across the
P701 connector?
P701 connector?
NO
Is the resistor R729
open?
open?
YES
Replace R729.
YES
NO
Replace power unit?
Is the fuse F801 open?
YES
Replace the F801.
NO
Is the Bimetal SW open?
YES
Push the red button of
the bimetal.
the bimetal.
NO
Replace the Inlet unit.
Display