Sharp XG-MB67X, Service Manual

Page: 35 / 128

XG-MB67X
8 – 7
Checking the lamp light-up
Does the lamp turn on
when the power is turned
on? YES Go to "Check when the
lamp turns off soon after
turning on".
NO
Is the lamp tight in the
socket? YES Securely insert the con-
nectors.
NO
Has the FPC cable to
SC3581 come off or is it
loose? YES Securely insert the con-
nectors.
NO
Is rotating sound of the
color wheel heard? NO Check IC3581 and periph-
eral circuits. (Refer to the
waveform chart .)
YES Replace the color wheel.
YES
Is approx. 0.7 V applied to
TL1706? NO Check IC1701 and periph-
eral circuits. (Refer to the
waveform chart .)
YES
Has the harness connected
to P702 on the power sup-
ply unit come off, or is it
loose? Otherwise, is it bro-
ken? YES Fully insert the connec-
tors or replace the har-
nesses.
NO
Dose the lamp turn on after
the replacement? YES Replace the lamp.
NO
Is 340 VDC applied to both
ends of C914? NO Go to "Power supply PWB
check".
YES
Is D911 or D912 shortcir-
cuited? YES Replace both D911 and
D912.
NO
Is D914or D910 shortcir-
cuited? YES Replace D914 or D910,
whichever is short-cir-
cuited.
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