26
DDJ-RZX
1
2
3
4
A
B
C
D
E
F
1
2
3
4
Yes
When the signal is interrupted at the path from
IC1701 to IC1901-IC1903, confirm the
peripheral circuits of the IC.
If there is no problem, replace the
corresponding IC among IC1701 and IC1901
to IC1903.
LCD Module : CWX4352
LCDM Assy : DWX3828
LCDP Assy : DWX3791
LCD Module : CWX4352
LCDM Assy : DWX3828
LCDP Assy : DWX3791
No
Is the signal output to the LVDS path?
Confirm the connecting path of pin 8 of IC1351
and pin 8 of 1851 (PWM signal).
If there is no problem, replace the LCDM and
LCDP Assys.
Replace the LCDM Assy as IC1501 or the
peripheral circuits are supposed to be defective.
When the LCD BRIGHTNESS is changed to
“1” - “4” from the UTILITY menu, confirm that
the Duty (ratio of High/Low time) of the following
waveforms vary.
Or confirm if the following waveforms are normal.
LCDM Assy : CN1351 2pin, IC1351 8pin
LCDP Assy : CN1851 2pin, IC1851 8pin
Refer to “
LCD Backlight
” as to waveforms.
Note: The waveform duty does not vary when the
LCD BRIGHTNESS is “5” , And decide the
judge by not the waveform duty variation but
the waveform normality, as it is unable to
change from the UTILITY such as the occasion
when the LCD of MIXER section is not displayed.
The ratio of the “Low” of waveform increases
when the LCD BRIGHTNESS value is rather small.
varies
normal
The circuits operates normal until just before
the LCD module.
Replace the LCD module as it is supposed to
be defective.
varies
normal
As the output waveforms of IC1351 and
IC1851 are not normal, confirm the peripheral
circuits of that ICs.
And confirm if the input power voltage
(V+5R2BL1/2/3) of this IC is normal.
If there is no problem, replace the LCDM and
LCDP Assys as IC1351 and IC1851 are
supposed to be defective.
Not vary
abnormal
Not vary
abnormal
Does the duty of the waveform
of pin 2 of CN1351and pin 2
of CN1851 vary?/
Are the waveforms normal?
Does the duty of the waveform
of pin 8 of CN1351and pin 8
of CN1851 vary?/
Are the waveforms normal?
The brightness of the LCD backlight does not
adjust.
LCD backlight does not light up.
Confirmation the LCD backlight
Yes
As the LCD module is supposed to be
defective, replace it.
LCDM Assy (LCD of the MIXER section)
Replace the LCDM Assy
LCDP Assy
Confirm the path from IC1701 to
IC1901/IC1902/IC1903.
When the signal does not exist in this line,
confirm the path from IC1501 to CN1501/
CN1531 to 1701 of the LCD_LVDS
additionally
Refer to “
LVDS
” as to waveforms.
No
Is the RGB waveform normal?
Ch 2
Ch 4
3-5
3-6
Ch 1:
Ch 2: TP1618 (LVDS_CLKP)
Ch 3:
Ch 4: TP1617 (LVDS_CLKN)
V: 200 mV/div. H: 10 ns/div.
LVDS
*: oscilloscope is set to "Coupling AC"
3-7
3-8
3-9
3-10
Ch 1: TP1610 (V+5R2BL1/2)
Ch 2: TP1625 (BL_PWM)
Ch 3: TP1859 (CN1851_pin 1)
Ch 4: TP1860 (CN1851_pin 2) (LED1/LED2)
Ch1, Ch3 V: 5 V/div. H: 1 ms/div.
Ch2, Ch4 V: 2 V/div. H: 1 ms/div.
Ch1, Ch3 V: 5 V/div. H: 40 us/div.
Ch2, Ch4 V: 2 V/div. H: 40 us/div.
Ch 1
Ch 2
Ch 3
Ch 4
Ch 1
Ch 2
Ch 3
Ch 4
LCD Backlight