Bright Adjustment; Contrast Adjustment - Sony CCD-TRV32 Service Manual

20-3.

BRIGHT adjustment

Purpose : Adjusts video signal level to drive the LCD
panel.
Adjustment Error : Picture on LCD will be white saturated or black
compressed.
Mode Playback
Signal Color bar signal with the chroma and
burst signals turned OFF.
CN804 〈CN1804〉 pin 2 (VG)
Measurement point
Measuring equipment Oscilloscope
[External trigger : CN804 〈CN1804〉
pin !¡ (HDB)]
Adjustment page F
Adjustment address D8
Type 1 : A=1.50 ± 0.05Vp-p
Specification
Type 2 : A=0.50 ± 0.05Vp-p
Type 3 : A=0.47 ± 0.05Vp-p
Type 4 : A=2.44 ± 0.05Vp-p
Adjustment procedure:
Order Page Address
1 6
2 F D8
3
4 6 00
Related Adjustment:

CONTRAST adjustment

NTSC MODEL (TYPE 4 only)
2H
2H 2H
NTSC MODEL (TYPE 3 only)
2H
2H 2H
Data
00 01 After setting the data, press the PAUSE button. (Preparation)
Change data using the PLAY and STOP buttons until the VG signal amplitude (A) has
the specification value.
Press the PAUSE button.
00 After setting the data, press the PAUSE button. (End)
Pedestal level of
inverted waveform
Amplitude level A
Pedestal level of
non-inverted
waveform
Blue
A
Pedestal level
(peak to peak)
of blue signal
LCD size
Type 1
2.5 inch (PAL only)
Type 2
Type 3
3.0 inch (NTSC)
Type 4
3.5 inch (NTSC/PAL)
No mark : Type 1, Type 4
〈 〉 : Type 2, Type 3
Note 1 : Adjustment procedure of TYPEs 2 and 3 machines
are as follows :
D.RANGE (item 20-5) →
BRIGHT (item 20-3) →
CONTRAST (item 20-4)
Note 2 : The adjustment points of the TYPEs 2 and 3 machines
are as follows :
Note 3 : This adjustment must be performed together with the
CONTRAST adjustment as the pair adjustment.
(Re-adjust them when they are out of specifications.)
Procedure
PAL MODEL (TYPE 1, 4)
2H
2H 2H
PAL MODEL (TYPE 2 only)
2H
2H 2H
6-35
LCD board
PD-74/SD-24
PD-75/SD-25
PD-77
PD-76
Pedestal level of
inverted waveform
Amplitude level A
Pedestal level of
non-inverted
waveform
Blue
A
Pedestal level
(peak to peak)
of blue signal