Sharp XG-MB50X Service Manual page 35

Checking the lamp
light-up
Does the lamp turn on
when the power is turned
NO
Is the lamp tight in the
socket?
NO
Has the FPC cable to
SC3581 come off or is it
loose?
NO
Is rotating sound of the
color wheel heard?
YES
Is approx. 0.7 V applied to
TL1706?
YES
Has the harness connected
to P702 on the power
supply unit come off, or is it
loose? Otherwise, is it
broken?
NO
Dose the lamp turn on after
the replacement?
NO
Is 340 VDC applied to both
ends of C914?
YES
Is D911 or D912 short-
circuited?
NO
Is D914or D910 short-
circuited?
Go to "Check when the
YES
lamp turns off soon after
turning on".
YES
Securely insert the
connectors.
YES
Securely insert the
connectors.
Check IC3581 and
NO
peripheral circuits. (Refer
to the waveform chart 2.)
Check IC1701 and
NO
peripheral circuits. (Refer
to the waveform chart 1.)
YES
Fully insert the connectors
or replace the harnesses.
YES
Replace the lamp.
NO
Go to "Power supply PWB
check".
YES
Replace both D911 and
D912.
YES
Replace D914 or D910,
whichever is short-circuited.
35
YES
Replace the color wheel.
XG-MB50X
XR-11XC
XR-10X/S
XR-20X/S