Sharp XG-MB70X (serv.man13) Service Manual ▷ View online
37
XG-MB70X
Checking the lamp light-up
Does each cooling fan
function?
function?
Check the power supply circuit
or fan circuit on the main circuit.
or fan circuit on the main circuit.
Is the rotating sound of the
color wheel heard?
color wheel heard?
Check IC9102, 9003 and
the peripheral circuits of
the motor driver IC
IC9101.
the peripheral circuits of
the motor driver IC
IC9101.
Go to "Checking the
peripheral circuits of
the formatter".
peripheral circuits of
the formatter".
Replace the color wheel.
Is the discharging sound
(high voltage) heard?
(high voltage) heard?
Is the lamp tight in the
socket?
socket?
Replace the lamp.
Securely insert the
connectors.
connectors.
Is DC voltage of approx.
370V applied to both ends
of the ballast power supply?
370V applied to both ends
of the ballast power supply?
Is pin (2) of P1707 at the
H level?
H level?
Go to "Checking the
power unit".
power unit".
Go to "Checking the
peripheral circuits of the
peripheral circuits of the
Check IC1701, IC2003 and
their peripheral circuits.
their peripheral circuits.
NO
YES
NO
ABNORMAL
YES
NORMAL
YES
NO
YES
NO
NO
YES
YES
NO
38
XG-MB70X
Checking the peripheral circuits
of the formatter
of the formatter
What is the screen problem?
The rainbow-like screen is
displayed. Each color (R,
G and B) does not match.
displayed. Each color (R,
G and B) does not match.
The problem remains
even after adjusting
"Process menu", "DLP"
and "Index".
even after adjusting
"Process menu", "DLP"
and "Index".
IC9003 and IC9004 are
defective.
defective.
Check the main PWB
and power unit.
and power unit.
IC9301 or its peripheral
circuits are defective.
circuits are defective.
Check the color wheel
sensor PWB.
sensor PWB.
IC9301 or its peripheral
circuits are defective.
circuits are defective.
IC9301 or its
peripheral circuits are
peripheral circuits are
The screen is all black.
Other
Thick and white
vertical lines (flash).
Is the socket of
SC9001 connected
properly?
SC9001 connected
properly?
Does the color wheel
rotate?
rotate?
Is the proper voltage
supplied to the socket
of SC9001?
supplied to the socket
of SC9001?
Is the voltage of the
positive polarity pin of
C9308 normal (+5V)?
positive polarity pin of
C9308 normal (+5V)?
IC9101, 9102, their
peripheral circuits or
color wheel is defective.
peripheral circuits or
color wheel is defective.
Does the lamp turn on?
When no signal is sent, is
a pulse signal of 180Hz
present on pin (2) of
P1705 on the main PWB?
a pulse signal of 180Hz
present on pin (2) of
P1705 on the main PWB?
Is the voltage of pin (9)
of IC9301 normal
(between +23 and
+26V)?
of IC9301 normal
(between +23 and
+26V)?
Is the voltage of pin
(13) of IC9301 normal
(-26V)?
(13) of IC9301 normal
(-26V)?
Is the voltage of pin
(49) of IC9301 normal
(+7V)?
(49) of IC9301 normal
(+7V)?
Is there a pulse signal
of 60MHz at TP9025
(DCLK_L)?
of 60MHz at TP9025
(DCLK_L)?
Is the socket of
SC9001 connected
properly?
SC9001 connected
properly?
Is the voltage of pin (3)
of IC9007 normal
(+2.5V)?
of IC9007 normal
(+2.5V)?
Is there a sine wave of
400MHz at pins (18)
and (20) of IC9001?
400MHz at pins (18)
and (20) of IC9001?
IC9003, IC9004,
IC9006 or their
peripheral circuits are
defective.
IC9006 or their
peripheral circuits are
defective.
Does the fan rotate?
Is the pulse-shaped
waveform supplied to
the pin (14) of P1707
on the main PWB?
waveform supplied to
the pin (14) of P1707
on the main PWB?
Check the ballast unit
and power unit.
and power unit.
Are contact terminals
of DMD, the formatter
board and CLGA
dirty?
of DMD, the formatter
board and CLGA
dirty?
Reinstall DMD, optical
mechanism, and
Formatter PWB.
mechanism, and
Formatter PWB.
IC9001 or its
peripheral circuits are
defective.
peripheral circuits are
defective.
Check the fan circuits.
IC2003, 1701 or their
peripheral circuits are
defective.
peripheral circuits are
defective.
YES
NO
NO
YES
YES
NO
YES
YES
NO
YES
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
NO
YES
NO
YES
39
XG-MB70X
Checking the RGB input
Send RGB signals to INPUT1
or INPUT2. Use keys on the
main unit or remote control to
select INPUT1 or INPUT2.
or INPUT2. Use keys on the
main unit or remote control to
select INPUT1 or INPUT2.
Are sync signals input to pins
(30) and (31) of IC3005?
(30) and (31) of IC3005?
Go to "Checking the sync
signal".
signal".
Are picture signals input to pins
(43), (48) and (54) of IC3005?
(43), (48) and (54) of IC3005?
Are picture signals input to
pins (2), (5), (11), (3), (6) and
(10) of IC3003?
pins (2), (5), (11), (3), (6) and
(10) of IC3003?
When toggling between INPUT1
and INPUT2 by using keys on
the main unit and remote
control, does the voltage of pin
(1) of IC3003 change?
and INPUT2 by using keys on
the main unit and remote
control, does the voltage of pin
(1) of IC3003 change?
Replace IC3003.
Check Q3123, IC2003 and
peripheral circuits.
peripheral circuits.
Are picture signals input to pins
(1), (5) and (8) of IC4003, and
pins (1), (5) and (8) of IC4004?
(1), (5) and (8) of IC4003, and
pins (1), (5) and (8) of IC4004?
When toggling between INPUT1
and INPUT2 by using keys on
the main unit and remote control,
does the voltage of pins (2), (4)
and (7) of IC4003, and pins (2),
(4) and (7) of IC4004 change?
and INPUT2 by using keys on
the main unit and remote control,
does the voltage of pins (2), (4)
and (7) of IC4003, and pins (2),
(4) and (7) of IC4004 change?
Check IC4009, IC2003 and
peripheral circuits.
peripheral circuits.
Check SC4003, SC4001 and
peripheral circuits.
peripheral circuits.
Replace IC4003 or IC4004.
Are picture signals input to pins (43),
(48) and (54), and sync signals input
to pins (30) and (31) of IC3005?
(48) and (54), and sync signals input
to pins (30) and (31) of IC3005?
Check IC3106, 3107, 3108
and peripheral circuits.
and peripheral circuits.
Are sync signals output from pins
(64), (65) and (66), and sine wave
output from pin (67) of IC3005?
(64), (65) and (66), and sine wave
output from pin (67) of IC3005?
Check IC3005 and peripheral
circuits.
circuits.
Are signals input to pins (56),
(58), (62) and (64) of SC2501?
(58), (62) and (64) of SC2501?
Check IC8001 and peripheral
circuits.
circuits.
Go to "Checking the peripheral
circuits of the formatter".
circuits of the formatter".
NO
YES
YES
NO
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
YES
NO
YES
NO
YES
1
1
40
XG-MB70X
YES
YES
Check IC4003, IC4004 and
peripheral circuits.
peripheral circuits.
NO
NO
Check IC3101 and
peripheral circuits.
peripheral circuits.
NO
Check IC3103 and
peripheral circuits.
peripheral circuits.
NO
2
1
Component signal
check
check
Send component signals to
INPUT1 or INPUT2. Use
keys on the main unit or
remote control to select
INPUT1 or INPUT2.
INPUT1 or INPUT2. Use
keys on the main unit or
remote control to select
INPUT1 or INPUT2.
Is picture signal including
sync signal input to pin (46)
of IC3002?
sync signal input to pin (46)
of IC3002?
Are picture signals input to
pins (8), (9) and (10) of
IC3101?
pins (8), (9) and (10) of
IC3101?
NO
Are picture signals output
from pins (35), (37) and
(39) of IC3101?
from pins (35), (37) and
(39) of IC3101?
YES
Are picture signals sent
from pins (76), (77) and
(78) of IC3101 to pins (17),
(18) and (19) of IC3103?
from pins (76), (77) and
(78) of IC3101 to pins (17),
(18) and (19) of IC3103?
YES
Are picture signals sent
from pins (21), (22) and
(23) of IC3103 to pins (67),
(68) and (69) of IC3103?
from pins (21), (22) and
(23) of IC3103 to pins (67),
(68) and (69) of IC3103?
YES
Check C3101 and
peripheral circuits.
peripheral circuits.
YES
Click on the first or last page to see other XG-MB70X (serv.man13) service manuals if exist.