Toshiba 2857DD - Service Mode Adjustments (Continued); White Balance Adjustment; Cutoff Adjustments (RCUT, GCUT, BCUT); Drive Adjustments (GDRV, BDRV)

ITEM ADJUSTMENT PROCEDURE
WHITE
BALANCE
1.
Set
Contrast
to
40,
and
brightness
to
+20
by
picture
control.
ADJUSTMENT
2.
Set
the
TV
in
service
mode,
and
get
the
inside
W/B
adjusting
signal
with
VIDEO
button
(see
pages
7,
9.).
3. Select RCUT, GCUT and BCUT with CHANNEL A, YW buttons, to set
individual
values
to
32,
and
to
set
GDRV
and
BDRV
to
20
with
VOLUME
<i —/+ buttons.
4.
Press
-/-
-
button
on
the
remote
control
and
rotate
Screen
VR
to
get
one
slight
horizontal
line
on
screen.
Note:
Every
pressing
of
-/--
button
provides
Horizontal
line
picture
and
Normal
picture
alternately.
5. Press -/-- button to release horizontal line picture, and select the two other
colors which did not light in the above step with CHANNEL 4A, W buttons.
Then tap VOLUME .4 -/+ buttons so that three colors slightly light in the
same level.
Light area check
(to show white)
* CUTOFF ADJUSTMENT
(RCUT)
(GCUT)
(BCUT)
* DRIVE ADJUSTMENT
(GDRV)
(BDRV)
XX To correct white balance in light area,
select GDRV and BDRV with CHANNEL
A, V buttons to adjust.
XX To correct white balance in dark area,
perform fine adjustment of RCUT, GCUT
and BCUT.
Dark area check
(to show black)
SELF DIAGNOSTIC FUNCTION
1) Press “9” button on Remote Control during display of adjustment menu.
The diagnosis will begin to check if interface among IC’s are executed properly.
2) During diagnosis, the following displays are shown.
® BLOCK
{SELF
CHECK)
UV
:
TV
reception
mode
@®
|
23905310
V1:
VIDEO
1
input
mode
(©)
1)
@
|
Power
:
00
V2
:
VIDEO
2
input
mode
(©
2)
@ | BUSLINE : OK
@®]
BUSCONT
:
OK
Indicated
color
of
mode
now
selected:
Green
and
Red
®
|
Block
>:
UVV1
V2
Indicated
color
of
other
modes
:
White
Qvo1
Green : Normal
Red: The microcomputer operates to provide
judgement of no video signal. The red color is
still indicated though the signal is input, failure
may exist in input signal line including QVO1.
QV01 : In case of indication green ---Normal
In case of indication red with input signal----
@ Part number of microcomputer (QA01)
@® Operation number of protecting circuit ----“00” is
normal.
When indication is other than “00”, overcurrent apts
to flow, and circuit parts may possibly be damaged.
® BUS LINE CHECK ----“OK" is normal. Failure may exist in output line including QVO1.
“SDA1-GND” means that SDA line is shorted to
ground.
“SCL1-GND” means that SCL line is shorted to
ground.
“SCL1-SDA1” means that SDA line is shorted to
SCL line.
@ BUS CONT ----“OK” is normal.
When indication shows “QOOO NG’, the device
with the number may possibly be damaged.
-i1-