Read Sharp XG-MB67X (serv.man3) Service Manual online
XG-MB67X
8 – 1
XG-MB67X
Service Manual
CHAPTER 8.
TROUBLE SHOOTING TABLE
[1] TROUBLE SHOOTING TABLE
Checking the basic operation
Does the power LED light up or
flash in red or green?
flash in red or green?
NO
Has P1701 come off or is it
loose?
loose?
YES
Fully insert the connector.
YES
NO
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 "Checking the lamp light-
up".
up".
NO
Nothing is displayed or white ver-
tical line noise
tical line noise
YES
Go to "DMD system check".
NO
Colors are not displayed normally.
Color deviation and color fluctua-
tion occur.
Color deviation and color fluctua-
tion occur.
YES
Check PHOTO SENSOR circuit.
NO
Are RGB and component input
displayed normally?
displayed normally?
NO
Go to "RGB and component sig-
nal check".
nal 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-MB67X
8 – 2
Main PWB check
Is 6 V applied to TL1702 and 13 V to
TL1703?
TL1703?
NO
Go to "Power supply ballast PWB check".
YES
Is approx. 6 V applied to TL1742?
NO
Check IC1742 and peripheral circuits.
YES
Is 1.5 V applied to TL1741?
NO
Check IC1741 and peripheral circuits.
YES
Is 3.3 V applied to TL1762?
NO
Check IC1763 and peripheral circuits.
YES
Is 2.5 V applied to TL1763?
NO
Check IC1762 and peripheral circuits.
YES
Is 5 V applied to TL1791?
NO
Check IC1791 and peripheral circuits.
YES
Is 3.3 V applied to TL1792?
NO
Check IC1792 and peripheral circuits.
YES
Is 12 V applied to TL1761?
NO
Check IC1761 and peripheral circuits.
YES
Is3.3 V applied to pin(1) of IC1743?
NO
Check IC1743 and peripheral circuits.
YES
Is 3.18V applied to pin(1) of IC2001? NO
Check IC2001 and peripheral circuits.
YES
Is 3.3 V applied to pin(3) of S2001?
NO
Check that it is set to the N side. Or remove
S2001.
S2001.
YES
Is rectangular wave of 50 MHz sent
to X2251 pin(3)?
to X2251 pin(3)?
NO
Check X2251 and peripheral circuits.
YRS
Check IC2002, IC2262, IC2263 and
peripheral circuits.
peripheral circuits.
XG-MB67X
8 – 3
DMD system check
Check P2501 for breakage and
solder crack and peripheral
resistance for solder crack.
solder crack and peripheral
resistance for solder crack.
Check SC9101 for breakage
and solder crack.
and solder crack.
Is there any vertical stripe
(block noise) on the screen?
(block noise) on the screen?
YES
The main PWB and DMD PWB are in poor
contact. Check the contact surface for dirt
and smear. Check the DMD connector for
breakage. Reassemble the DMD, optical
mechanism, and DMD PWB.
contact. Check the contact surface for dirt
and smear. Check the DMD connector for
breakage. Reassemble the DMD, optical
mechanism, and DMD PWB.
NO
Is the screen all black?
NO
Is approx. 7 V applied to TL9303?
NO
Check IC9301 and peripheral cir-
cuits.
cuits.
YES
YES
Is approx. 26 V applied to TL9301?
NO
Check IC9301 and peripheral cir-
cuits.
cuits.
YES
Is approx. -26 V applied to TL9302?
NO
Check IC9301 and peripheral cir-
cuits.
cuits.
YES
The main PWB and DMD PWB are in poor
contact. Check the contact surface for dirt
and smear. Check the DMD connector for
breakage. Reassemble the DMD, optical
mechanism, and DMD PWB.
contact. Check the contact surface for dirt
and smear. Check the DMD connector for
breakage. Reassemble the DMD, optical
mechanism, and DMD PWB.
Is 3.27 V applied to IC2231
pin(1) and 1.8 V to TL2231?
pin(1) and 1.8 V to TL2231?
NO
Check IC2231, IC2201, and their peripheral
circuits.
circuits.
YES
Is 400 MHz on IC2241 pin(20)? NO
Check IC2241 and peripheral circuits.
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XG-MB67X
8 – 4
YES
Is approx. 7 V applied to
TL9303?
TL9303?
NO
Check IC9301 and peripheral circuits.
YES
Is approx. 26 V applied to
TL9301?
TL9301?
NO
Check IC9301 and peripheral circuits.
YES
Is approx. -26 V applied to
TL9302?
TL9302?
NO
Check IC9301 and peripheral circuits.
YES
The main PWB and DMD PWB
are in poor contact. Check the
contact surface for dirt and
smear. Check the DMD con-
nector for breakage. Reassem-
ble the DMD, optical
mechanism, and DMD PWB.
are in poor contact. Check the
contact surface for dirt and
smear. Check the DMD con-
nector for breakage. Reassem-
ble the DMD, optical
mechanism, and DMD PWB.
1