17
CDJ-3000
5
6
7
8
5
6
7
8
A
B
C
D
E
F
1
Back light circuit
have defect
MLCB Assy
Confirm that pin 1 (BLO_A) of CN6003 is
about 30 V.
If not confirmed, confirm the peripheral circuit of
IC6004 (LCD BACKLIGHT DRIVER) and repair
the defective soldering if found. If not confirmed,
replace MLCB Assy.
—
4
MAIN CPU has
defect
MAIN Assy
Confirm that the waveform of LVDS circuits
of CN3002 (pin 3, 4, 7, 8, 11, 12, 15, 16, 19
and 20) are normal.
If not confirmed, confirm the peripheral circuit of
IC1801 (MAIN CPU) and repair the defective
soldering and replace parts if found. If not
confirmed, replace MAIN Assy.
10.45 WAVEFORMS
1
6
Main LCD module
has defect
Main LCD module
The problem has not improved until the above. Replace Main LCD module.
5
LVDS circuit from
MAIN Assy have
defect
MLCB Assy
Confirm that the waveform of LVDS circuits
of CN6001 (pin 30, 31, 33, 34, 36, 37, 39,
40, 42 and 43) are normal.
+
The same waveform as in
"10.45 WAVEFORMS
1
" is displayed.
If not confirmed, confirm LVDS circuit from MAIN
Assy and repair the defective soldering and
replace parts if found.
10.45 WAVEFORMS
1
10.45 WAVEFORMS
2
—
—
—
5
Jog LCD module
has defect
Jog LCD module
The problem has not improved until the above. Replace Jog LCD module.
—
2
TFT power
supply circuit
have defect
MLCB Assy
Confirm that the voltage of V+20LCD,
V+12R4LCD, and V-10LCD of IC6001
(LCD POWER IC) are normal.
+
The voltage is designed approximately as
the circuit name. (e.g. V+3R3*
d
3.3 V)
If not confirmed, confirm the peripheral circuit of
IC6001 (LCD POWER IC) and repair the
defective soldering if found. If not confirmed,
replace MLCB Assy.
3
Power supply
circuit from MAIN
Assy have defect
MLCB Assy
Confirm that the voltage of pin 4 (V+3R3LCD)
of CN6001 is normal.
+
The voltage is designed approximately as
the circuit name. (e.g. V+3R3*
d
3.3 V)
If not confirmed, confirm V+3R3D circuit from
MAIN Assy and repair the defective soldering
and replace parts if found.
[2] LCD display
[2-1] Main LCD does not turn on or the display is abnormal
No.
Cause
Diagnostics Point
Item to be Confirmed
Corrective Action
Reference
1
Defective soldering Each Assy
Confirm the soldering status of each LED.
Repair the defective soldering if found.
—
2
Defective LED
Each Assy
Confirm that the forward voltage of the LED
is about 2 V to 3 V.
If not confirmed, replace LED.
—
4
PANEL CPU
has defect
PNLB Assy
Confirm that the control signals output normal. If not confirmed, replace IC7202 (PANEL CPU)
or IC7200/IC6002/IC6003 (Shift register).
—
3
Lighting circuit
have defect
Each Assy
Confirm that the control signals that output
from IC7202 (PANEL CPU) or IC7200/
IC6002/IC6003 (Shift register) are normal.
If the signal is normal and the LED does not light
on, replace the drive transistor.
—
[3] LED indication
[3-1] Monochromatic LED does not turn on
No.
Cause
Diagnostics Point
Item to be Confirmed
Corrective Action
Reference
1
Back light circuit
have defect
MAIN Assy
Confirm that the voltage of the emitter of
Q4407 is normal.
+
The normal value is 0.1 V to 1.3 V.
If not confirmed, confirm the peripheral circuit of
Q4402, Q4403, Q4404, Q4406, Q4407 and
Q4408 and repair the defective soldering and
replace parts if found.
—
2
Power supply
circuit from MAIN
Assy have defect
JLCD Assy
Confirm that the voltage of pin 47 (V+3R3D)
on CN7004 is normal.
+
The voltage is designed approximately as
the circuit name. (e.g. V+3R3*
d
3.3 V)
If not confirmed, confirm V+3R3D circuit from
MAIN Assy and repair the defective soldering
and replace parts if found.
—
3
MAIN CPU has
defect
MAIN Assy
Confirm that the waveforms of the input
circuit (DU_CLKOUT, DU_DR*, DU_DG*,
DU_DB*) of IC4401 (LVDS Tx) is normal.
If not confirmed, confirm the peripheral circuit of
IC1801 (MAIN CPU) and repair the defective
soldering and replace parts if found. If not
confirmed, replace MAIN Assy.
10.45 WAVEFORMS
2
4
LVDS circuit from
MAIN Assy have
defect
JLCD Assy
Confirm that the waveforms of the input
circuit (JCL_CK, JLC_R*, JLC_G*, JLC_B*)
of IC7005 (LVDS Rx) is normal.
+
The same waveform as in
"10.45 WAVEFORMS
2
" is displayed.
If not confirmed, confirm the peripheral circuit of
IC1801 (MAIN CPU) and repair the defective
soldering and replace parts if found. If not
confirmed, replace MAIN Assy.
[2-2] Jog LCD does not turn on or the display is abnormal
No.
Cause
Diagnostics Point
Item to be Confirmed
Corrective Action
Reference
Note: The point where Monochromatic LED, full-color LED are applied to refer to "6. SERVICE MODE_Mode 2/10 LED ALL ON, LCD CHECK".
