TOSHIBA_HOW TO ENTER SERVICE MODE TO TOSHIBA COLOR TELEVISIONS (Various Models)
TOSHIBA – 2989UE / 2989UH / 2989XP
Entering into service mode
Press [Mute] button once on the remote control
handset.
Once again press and hold remote handset [mute]
button.
While keeping the Mute] button pressed, press [Menu]
button on TV set.
Displaying the adjustment menu
Press [menu] button on the TV set to shift from
adjustment mode to service mode and vice versa.
Service mode keys
Select
adjustment item by pressing the [channel+] or [channel-} button on the
remote control handset.
Adjust
data value by pressing the [Volume+] or [Volume-] button on the remote control
handset.
Cancellation of service mode
To return to normal TV mode, press Power] /
[Standby] button to turn off TV once
Service mode adjustments
Following adjustments items will appear on the
screen.
Item Name of adjustment Reference
data
R CUT R
CUTOFF B/W 40H
G CUT G
CUTOFF 40H
B CUT B
CUTOFF 40H
GDRV G
DRIVE 40H
BDRV BLUE
DRIVE 40H
CNTX SUB-CONTRAST
MAX(4:3 MODE) 7FH
BRTC SUB
BRIGHT CEN 7FH
COLC SUB
COLOR CEN NTSC 39H
TNTC SUB
TINT GEN 40H
COLP SUB
COLOUR CEN PAL 39H
COLS SUB
COLOUTR CEN SECAM 27H
SCOL SUB
COLOUR 13H
SCNT SUB
CONTRAST 2H
VOLS VOL
SCART 75H
FVOL FM
VOL PRE SCALE 15H
NVOL NICAM
VOL PRE SCALE 3AH
NICL NICAM
THRESHOLD LEVEL 03H
NICH NICAM
THRESHOLD LEVEL 0AH
IDL IGR
THRESHOLD LEVEL 04H
IDH IGR
THRESHOLD LEVEL 0EH
EVOL EXT
PRE VOLUME 01H
EMX NICAM
ON LEVEL FCH
EMN NICAM
ON LEVEL 64H
FMA FM
ATTENNUATOR LEVEL 00H
STS STEREO
SEPERATION 00H
HPOS 50HZ
HORIZONTAL POSITION FEH
VPOS V-POSITION 0DH
HIT HEIGHT 3EH
VLIN V-LENEARITY 17H
VSC V-S
CORRECTION 18H
VPS V-SHIFT 0CH
VCP V-COMPENSATION 07H
WID PICTURE
WIDTH 18H
PARA E-W
PARABOLA 22H
CNR E-W
CORNER 04H
TRAP TRAPEZIUM 0FH
HCP H-COMPENSATION 01H
VFC V-F
CORRECTION 0FH
BELL SECAM
BELL FILTER 80H
SRY SECAN
R-Y 08H
SBY SECAM B-Y 08H
INITILIZATION OF MEMORY DATA OF QA02
After replacing IC the following initialization is
required.
Enter the
service mode then select any register item.
Press and
hold the [call] button on the remote then press the [channel+] button on
the TV. The initialization of IC has been completed.
Check the
picture carefully. If necessary, adjust
any adjustment item as explained below.
Perform auto search memory as explained in the
owner’s manual.
CAUTION:- Never attempt to initialize the data
unless memory IC has been replaced.
Test signal selection
In the service mode, pressing of [AV] / [Video]
button shows the test patterns on screen.
Every pressing of [AV] / [Video] button cycle through 14 NTSC test
patterns and 14 PAL test patterns.
Some of the test patterns are:
Red single colour, green single colour, blue single colour
Black single colour, white single colour
White balance adjustment pattern
Black cross- bar, white crossbar
Black crosshatch, white cross hatch
Black cross dot, white cross dot, h signal etc.
White balance adjustment
Cutoff adjustment [RCUT] [GVUT] [BCUT]
Drive adjustment [GDRV] [BDRV]
- Set contrast to 40, and brightness to +20 by picture control.
- Set the TV in service mode, and get the inside W/B adjustment signal with [AV/Video] button.
- Select R CUT, G CUT, AND B CUT with [Channel+/-] buttons, to set individual values to 32, and to set GDRV and BDRV to 20 with [Volume+/-] buttons.
- Press [-/--] button on the remote control and rotate screen VR to get one slight horizontal line on screen.
- Every pressing of [-/--] button provides horizontal line picture and o\normal picture alternately.
- Press [-/--] button to release horizontal line picture, and select the two other colours which did not light in the above step with [CHANNEL+/-]. Then tap [Volume+/-] buttons so that three colors slightly light in the same level..
- To correct white balance in light area, select GDRV and BDRV with [CHANNEL+/-] buttons to adjust.
- To correct white balance in dark area, perform fine adjustment to RCUT, GCUT and BCUT.
Self-diagnostic function.
- Press [9] button on the remote control during display of adjustment menu.
- The diagnosis will begin to check if interfaces among ICs are executed properly.
During diagnosis the following displays are shown.
-----------------------------------------------------------------------
<Self
check>
2390****
power 00
bus
line OK
bus
cont OK
block UV
V1 V2
QV01
------------------------------------------------------------------------
Values 1-5
are explained below
Part number of micro control
- Operation number of protecting circuit-“00” is normal. When indication is other than “00”, over-current apts to flow, and circuit parts may possibly damaged.
BUS LINE CHECK OK
NORMAL
“SDA 1- GND” means that SDA line is shorted to
ground
“SCL - GND” means that SCL line is shorted to
ground.
“SCL 1-SDA 1” means that SDA line is shorted to SCL
line
bus
cont “OK” is normal
When indication shows “Q000 NG”, the device with the
number may possibly damage.
Block
UV-TV reception mode
V1-VIDEO 1 INPUT MODE (AV1)
V2-VIDEO2 input mode (AV 2)
Indicated colour of mode now selected: Green and
Red.
Indicated colour of other modes: White.
Green ; Normal
Red : the microcomputer operates to provide judgment
of no video signal. The red color is still indicated through the signal is input
QV01: In case of indication green-normal. In
case of indication red with input signal -
failure may exist in output line including QV01.
TOSHIBA – 2150 / 2876DD / 2988DG
Entering into service mode.
Press [Mute] button. Press and hold [Mute] button and press [Menu] on local keyboard.
Service mode keys
Select [PR+/-], adjust [VOL+/-],Store; [Auto], test
picture [AV]
Cancellation of service standby.
