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XG-MB67X

8 – 1

XG-MB67X

Service Manual

 

Does the power LED light up or 
flash in red or green?

NO

Has P1701 come off or is it 
loose?

YES

Fully insert the connector.

YES

NO

Does the set function with its keys 
or the remote controller?

NO

Go to "Main PWB check".

YES

Lamp does not turn on or it turns 
off in a short time.

YES

Go to "Checking the lamp light-
up".

NO

Nothing is displayed or white ver-
tical line noise

YES

Go to "DMD system check".

NO

Colors are not displayed normally. 
Color deviation and color fluctua-
tion occur.

YES

Check PHOTO SENSOR circuit.

NO

Are RGB and component input 
displayed normally?

NO

Go to "RGB and component sig-
nal check".

YES

Is VIDEO input displayed nor-
mally?

NO

Go to "VIDEO input check".

YES

Is S-VIDEO input displayed nor-
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

Is 6 V applied to TL1702 and 13 V to 
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.

YES

Is rectangular wave of 50 MHz sent 
to X2251 pin(3)?

NO

Check X2251 and peripheral circuits.

YRS

Check IC2002, IC2262, IC2263 and 
peripheral circuits.

XG-MB67X

8 – 3

Check P2501 for breakage and 
solder crack and peripheral 
resistance for solder crack.

Check SC9101 for breakage 
and solder crack.

Is there any vertical stripe 
(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. 

NO

Is the screen all black?

NO

Is approx. 7 V applied to TL9303?

NO

Check IC9301 and peripheral cir-
cuits.

YES

YES

Is approx. 26 V applied to TL9301?

NO

Check IC9301 and peripheral cir-
cuits.

YES

Is approx. -26 V applied to TL9302?

NO

Check IC9301 and peripheral cir-
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. 

Is 3.27 V applied to IC2231 
pin(1) and 1.8 V to TL2231?

NO

Check IC2231, IC2201, and their peripheral 
circuits.

YES

Is 400 MHz on IC2241 pin(20)? NO

Check IC2241 and peripheral circuits.

1

XG-MB67X

8 – 4

YES

Is approx. 7 V applied to 
TL9303?

NO

Check IC9301 and peripheral circuits.

YES

Is approx. 26 V applied to 
TL9301?

NO

Check IC9301 and peripheral circuits.

YES

Is approx. -26 V applied to 
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. 

1