Sharp XG-MB70X Serviceanleitung Seite 38

XG-MB70X
Checking the peripheral circuits
of the formatter
The rainbow-like screen is
displayed. Each color (R,
G and B) does not match.
The problem remains
even after adjusting
"Process menu", "DLP"
and "Index".
YES
IC9003 and IC9004 are
defective.
Check the main PWB
and power unit.
IC9301 or its peripheral
circuits are defective.
Check the color wheel
sensor PWB.
IC9301 or its peripheral
circuits are defective.
IC9301 or its
peripheral circuits are
What is the screen problem?
The screen is all black.
Is the socket of
SC9001 connected
properly?
YES
Does the color wheel
rotate?
NO
NO
Is the proper voltage
supplied to the socket
of SC9001?
YES
NO
Is the voltage of the
positive polarity pin of
C9308 normal (+5V)?
YES
IC9101, 9102, their
peripheral circuits or
color wheel is defective.
Does the lamp turn on?
YES
NO
When no signal is sent, is
a pulse signal of 180Hz
present on pin (2) of
P1705 on the main PWB?
YES
NO
Is the voltage of pin (9)
of IC9301 normal
(between +23 and
+26V)?
YES
NO
Is the voltage of pin
(13) of IC9301 normal
(-26V)?
YES
NO
Is the voltage of pin
(49) of IC9301 normal
(+7V)?
NO
Is there a pulse signal
of 60MHz at TP9055
(DCLK_L)?
Other
Is the socket of
SC9001 connected
properly?
YES YES
Is the voltage of pin (3)
of IC9001 normal
(+2.5V)?
YES
Is there a sine wave of
400MHz at pins (18)
and (20) of IC9001?
YES
IC9003, IC9004,
IC9006 or their
peripheral circuits are
defective.
NO
Does the fan rotate?
YES
Is the pulse-shaped
waveform supplied to
the pin (14) of P1707
on the main PWB?
YES
Check the ballast unit
and power unit.
38
Thick and white
vertical lines (flash).
Are contact terminals
of DMD, the formatter
board and CLGA
dirty?
Reinstall DMD, optical
mechanism, and
Formatter PWB.
NO
IC9001 or its
peripheral circuits are
defective.
NO
Check the fan circuits.
NO
IC2003, 1701 or their
peripheral circuits are
defective.