Table of Contents
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MAIN BOARD
T681
VR641
Q613
IC501H2
Q461
TP-B
T451
IC501H3
K1002
BLOCK DIAGRAM (OUTLINE)
Aerial
A101
TUNER
20
X132
Q141
21
VIF
6
22
7
IC201
X131
SIF
PC-IN
POWER
9
54
IF/VIDEO/
CHROMA/
25
26
34
DEF
2
I
C BUS
3
35
BLK
BLK
43
44
15
B
R
45
16
39
G
G
IC801
46
17
40
R
B
47
18
41
SCL
IC803
24
CPU
26
32
SDA
MEMORY
23
CVBS-IN
60
61
PROTECT-IN
19
1 - 15
80 - 63
IC802
ROM
V-OUT IC501
6
BLOCK DIAGRAM (AV SELECTOR/ NICAM DECODER)
IC1201
AV-SELECTOR
<MM1313>
K12H
Q1203
FRONT AV3
MONITOR-OUT
FRONT-AV
1(V)
(V)34
2(L)
Q1202
MONITOR-OUT
4(R)
SC-1
Y-IN
SC-1
31
13(V)
(VIDEO/AUDIO-L/R)
14(L)
16(R)
SC-2
SC-2
7(V)
C-IN
(VIDEO/Y/C/AUDIO-L/R)
29
8(L)
9(Y)
L-OUT
10(R)
33
11(C)
R-OUT
32
K12J
Y-OUT
Q1204/1207
41(V)
37
(VIDEO)
C-OUT
Q1205
38
IC201
IF/VIDEO/
CHROMA
C-OUT
Y-OUT
SIF-IN
AUDIO L/R-OUT
AUDIO-OUT
IC001
AUDIO-OUT
SDA/SCL
I
2
C BUS
FIG. 2
Part No. SKP20357
C2VYS
(SHEET 3-3)
IC801
UNDERSIDE OF BOARD
IC201
TP-A
KJ
KM
K1001
BLOCK DIAGRAM (SYSTEM CONTROL)
IC701
VIDEO-OUT
Q242
R
R
G
Q243
G
CRT
B
RC-IN
Q244
B
2
I
C BUS
25
26
CONTROL
TV-OUT
AV1
Q121~Q133
IC801
TV-IN
IC803
SCL
13
24
SC-1
SIF-IN
MEMORY
SDA
8
23
C
C-OUT
SC-2
15
AV2
Y
Y-OUT
19
18
POWER-FAIL
1 - 7, 63 - 80
DETECT
MONTO
SYNC-IN
-OUT
EW-OUT
Refer also
to FIG.-2.
AV SELECTOR
FIG. 3
H-OUT
T451
NICAM DECODER
FBT
Q432
T431
FOCUS
SCREEN
Q431
PCC
CONTROL
D.Y
V
CS
CONTROL
3
H
IC3451
NICAM
37
&
36
STEREO
<TDA9875>
12
60
61
4
5
OPTION SETTING
[After replacing the Memory IC (IC803)]
The memory IC, IC803, stores the option data of TV set and service adjustments data for each circuit, therefore,
when the memory IC is replaced, it should be performed following setting and SERVICE ADJUSTMENT on next
page.
To enter to the Option Mode
+ Press and hold the F/OK button on the remote control and P
button on the front panel of the TV. The option win-
dow will appear on the screen. Enter the settings as shown below for the correct SERVICE REF. NO..
OPTION
ON-TIMER
ON
SORT MODE
AUTO TUNING
PLUG & PLAY
ON
SERVICE REF. NO. CE28DN6-C-00
WELCOME TEXT
ON
CODE TEST
OFF
WSS
ON
WIDE
OFF
OPTION
4 LANGUAGE
312/313 Mode
ON
AV3 OPTION
ON
3D SURROUND
ON
SIF OPTION
BG & DK
AUTO VOLUME
OFF
ADJUST :
EXIT : RECALL
To set the option mode
+ Highlight the desired option item by using the P
or P
button .
+ To switch the option mode, use the Volume - (LEFT) or Volume + (RIGHT) button.
+ The data which is set in the option mode is stored into the memory IC automatically.
Following table shows the available option items and default setting mode.
Option Mode
Mode
Description & Note
ON-TIMER
ON or OFF
On-timer available, default OFF
SORT MODE
AUTO TUNE/SORT
Tuning mode, default AUTO TUNING"
or AUTO TUNING
or ATS EURO PLUS
PLUG & PLAY
ON or OFF
Plug & Play mode, default ON
WELCOME TEXT
ON or OFF
Display message when first set up, default ON
CODE TEST
OFF or ON
For factory use, default OFF
WSS
ON or OFF
Wide Screen Signaling available, default ON
WIDE
ON or OFF
Wide mode, default ON
OPTION
4 LANGUAGE
Destination option , default 4 LANGUAGE
or ALL LANGUAGE
312/313 Mode
ON or OFF
Teletext mode, default OFF
AV3 OPTION
ON or OFF
Front AV disable, default ON
SIF OPTION
ON or OFF
Television system, default BG I L/L'
Exit from the Service Mode
+ Press the RECALL button.
SERVICE ADJUSTMENTS
Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the
adjustments are carried out by using the RC handset.
[After replacing the Memory IC (IC803)]
The memory IC, IC803, stores the service adjustments data for each circuit, therefore, when the memory IC is
replaced, it should be performed "OPTION SETTING" on previous page and the following adjustments, refer to
further adjustment on page 14.
ADJUSTABLE SERVICE ADJUSTMENT
REGULAR
Item No.
OSD
Description
1
AGC
AGC Adjustment
2
CUT
Cut-Off Drive Adjustment
3
GRY
G-Drive Adjustment
4
GRY
B-Drive Adjustment
7
HBP
H-Blanking Phase Adjustment
8
OSD
OSD Positioning Adjustment
WIDE
Item No.
OSD
Description
1
P V-P
Vertical Centre Adjustment
2
P H-P
Horizontal Centre Adjustment
5
P V-S
Vertical Size Adjustment
6
P H-S
Horizontal Size Adjustment
7
P PCC
Pcc Adjustment
8
P TRP
Trapezoid Distortion Adjustment
10
P CNR
Corner Adjustment
IMPORTANT NOTICE
Do not attempt to adjust service adjustments not listed on the above otherwise it may cause
loss of performance and product safety.
28
40
To enter to the Service Mode
BLK-OUT
44
+ Press and hold the GREEN button on the remote control and then press the P
45
B-OUT
adjustment window will appear on the screen.
46
G-OUT
47
R-OUT
CPU
ADJUST
REGULAR
WIDE
OTHERS
TB1251
SELECT:
OK
EXIT : RECALL
60
CVBS
Q806
61
IC802
To select the mode and service item and change data value
ROM
+ Highlight the desired adjustment mode by using the P
or P
+ To select the adjustment item, use the P
or P
button.
+ To change the service data, use the Volume -(LEFT) or Volume + (RIGHT) button.
+ The data which is set in the service mode is stored into the memory IC automatically.
REGULAR mode
REGULAR
1, AGC
38
Adjustment No.
Adjustment Data
and Item name
Exit from the Service Mode
+ Press the RECALL button or turn off the TV set by using the Mains switch.
INITIALISATION OF MEMORY IC
To initialise the memory IC (IC803), press and hold the NORMAL button on te remote control and then press the P
button on the front panel of the TV set, and then turn the Mains switch Off and On. Now the initialisation is
completed.
When initialised the memory IC, all of the setting data (option data and service adjustment data) stored in the IC are
reset to the default value. So it is necessary to set the option settings and readjust the service adjustments listed on
left page.
ADJUSTMENTS
IMPORTANT NOTICE
Do not attempt to adjust the following service adjustments except when adjustments are required in servicing
otherwise it may cause loss of performance and product safety.
Button No. Operation
+ B VOLTAGE ADJUSTMENT
1
Increase Red
2
Decrease Red
1. Receive white raster pattern.
2. Set controls to normal.
4
Increase Green
5
Decrease Green
3. Connect digital voltmetre to test point TP-B and GND.
4. Adjust voltage to 130 ±0.5V using VR641 (21" model).
7
Increase Blue
Adjust voltage to 150 ±0.5V using VR641 (25" model).
8
Decrease Blue
CE25DN6-C-00
Adjust voltage to 150 ±0.5V using VR641 (28" model).
CE21DN6-C-00
DRIVE ADJUSTMENT
6. Select item no.3 "REGULAR 3, GRY" (G-Drive) or 4
AGC ADJUSTMENT
"REGULAR 4, GRY" (B-Drive) and adjust both initially
to 3F.
1. Input and tune a VHF RF signal which has the
7. Change data value of each item by using LEVEL + or
strongest signal strength.
LEVEL - button to obtain the proper white balance.
2. Connect digital voltmetre to test point TP-A and GND.
4. Enter to the service mode and select mode "REGU-
LAR", and select item no.1 "REGULAR 1, AGC".
PCC ADJUSTMENT
5. Press the LEVEL+ or LEVEL - button to adjust voltage
to be 3.2Vdc.
PCC ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
"FULL".
FOCUS ADJUSTMENT
2. Enter to the service mode and select mode "WIDE",
and select item no. 7 "WIDE 7.P PCC".
By using FOCUS VR, adjust focus control for well
3. Press the LEVEL+ or LEVEL - button to adjust the
defined scanning lines.
vertical line to be straight.
GREY SCALE ADJUSTMENT
SCREEN ADJUSTMENT
1. Receive black & white pattern.
2. Enter to the service mode and select mode "REGU-
LAR", and select item no. 2 "REGULAR 2, CUT". The
horizontal line will appear on the screen.
TRAPEZOID ADJUSTMENT
3. Set the SCREEN VR for one colour to be just visible.
1. Receive cross hatch pattern and set screen mode to
4. Using the numeric buttons shown set each colour to
"FULL".
minimum by decreasing to the point where any further
2. Enter to the service mode and select mode "WIDE",
decrease resets the adjustment to maximum value.
and select item no. 8 "WIDE 8.P TRP".
BIAS ADJUSTMENT
3. Press the LEVEL+ or LEVEL - button to correct the
5. By using the buttons 1, 2, 4, 5, 7, 8 on the remote
trapezum distortion of the vertical line.
control, adjust the line to be white.
The key allocation is as follows;
CORNER ADJUSTMENT
VER TICAL HEIGHT ADJUSTMENT
1. Tune the receiver to a cross hatch pattern.
1. Tune the receiver to a circular pattern.
2. Enter to the service mode and select mode "WIDE",
2. Enter to the service mode and select mode "WIDE",
and select item no. 10 "WIDE 10.P CNR".
and select item no. 5 "WIDE 5.P V-S.
3. Press the LEVEL+ or LEVEL - button to correct the
3. Press the LEVEL+ or LEVEL - button to adjust the
distortion of the vertical line around the corners.
vertical height.
HORIZONTAL ADJUSTMENT
HORIZONTAL CENTRING ADJUSTMENT
1. Tune the receiver to a circular pattern.
2. Enter to the service mode and select mode "WIDE",
and select item no. 2 "WIDE 2.P H-P".
3. Press the LEVEL+ or LEVEL - button to adjust the
horizontal centre.
H-BLANK ADJUSTMENT
1. Tune the receiver to a circular pattern.
HORIZONTAL WIDTH ADJUSTMENT
2. Enter to the service mode and select mode "REGU-
1. Tune the receiver to a circular pattern.
LAR", and select item no. 7 "REGULAR 7.HBF".
2. Enter to the service mode and select mode "WIDE",
3. Press the LEVEL+ or LEVEL - button to adjust the
and select item 6 "WIDE 6.P H-W".
centre of picture image to be screen centre.
3. Press the LEVEL+ or LEVEL - button to adjust the
horizontal width.
OSD POSITIONING ADJUSTMENT
1. Tune the receiver to a circular pattern.
HIGH-VOLTAGE CONFIRMATION
2. Enter to the service mode and select mode "REGU-
1. Tune the receiver to a circular pattern.
LAR", and select item no. 8 "REGULAR 8 OSD". The
2. Set controls to normal.
OSD test bar will appear on the top of screen.
3. Connect high-voltage meter to the anode of CRT and
3. Press the LEVEL+ or LEVEL - button to adjust proper
GND.
OSD positioning.
4. Confirm that voltage is 38.0±1.0kV for 21" model.
button inside of the door. The
Confirm that voltage is 29.0±1.0kV for 25" model.
Confirm that voltage is 29.0±1.0kV for 28" model.
VERTICAL ADJUSTMENT
VER TICAL CENTRING ADJUSTMENT
1. Tune the receiver to a circular pattern.
2. Enter to the service mode and select mode "WIDE",
and select item no. 1 "WIDE 1.P V-P".
.3 Press the LEVEL+ or LEVEL - button to adjust the
vertical centre.
button and then press the F/OK button.
WIDE mode
WIDE
1. P V-P
1F
Adjustment No.
Adjustment Data
A2 STEREO BOARD
and Item name
CPU PORT FUNCTIONS
Pin No.
Function Name
Function
IN/OUT
1
MMU0
External memory 0
OUT
2
MMU3
External memory 3
OUT
3
ADDR10
Address bus 10
OUT
4
DSN
Data Strobe
5
ADDR11
Address bus 11
OUT
6
ADDR9
Address bus 9
OUT
7
ADDR8
Address bus 8
OUT
8
R WN
Read Write Strobe
9
GND
10
VDD
Power Supply
IN
11
OSC-IN
Clock Input
IN
12
OSC-OUT
Clock Output
OUT
13
ADDR13
Address bus 13
OUT
14
ADDR14
Address bus 14
OUT
15
MMU1
External memory 1
OUT
16
MMU2
External memory 2
OUT
17
MMU4
External memory 4
OUT
18
MMU5
External memory 5
OUT
19
P3.7/CSO
Protect - Power failure detect input
IN
20
P3.6/ASN
Dolby CLK(L/L')
OUT
21
P3.5
Dolby SO(Super 3D)
OUT
22
P3.4
PITTARI switch
OUT
23
P5.1
IIC BUS SDA
IN/OUT
24
P5.0
IIC BUS SCL
OUT
25
P2.0
Remote Control Signal Input
IN
26
P2.3
Power Relay & LED Drive On: L
OUT
27
P2.4
SUB CPU SO
OUT
28
P0.2
Key switch input
IN
29
P0.1
SUB CPU CLK
OUT
30
P0.0
SUB CPU SI
IN
31
P4.7
THRESHOLD switch
OUT
32
P4.6
JIMAKU(Caption) switch
OUT
33
P4.5
On-Timer LED Drive ON: L
OUT
34
VDD
IN
35
GND
36
P2.1
AV1 Scart function input
IN
37
P2.2
AV2 Scart function input
IN
38
P2.5
RF AGC input
IN
39
P4.4
H-Blank On/Off
OUT
40
P4.3
AMP Mute Mute On: H
OUT
41
P4.2
Dolby RQ
OUT
42
P4.1
H-Blank Phase
OUT
43
P4.0
50/60Hz output 50Hz: H
OUT
44
FB
BLK Output for OSD (Active H)
OUT
45
B
Blue Output for OSD (Active H)
OUT
46
G
Green Output for OSD (Active H)
OUT
47
R
Red Output for OSD (Active H)
OUT
48
V-SYNC
V-Sync Input (Active H)
IN
49
H-SYNC
H-Sync Input (Active H)
IN
50
WSCR
VPS/WSS Slicer Line PLL
51
WSCF
VPS/WSS Slicer Line PLL
52
VDD-A
Analogue P ower Supply
IN
53
PXFM
Pixel Frequency Multiplier
54
RESET
Reset Input (Active L)
IN
55
MCFM
Pixel Frequency Multiplier
56
JTRSTO
57
TXCF
58
CVBS0
59
TEST0
60
CVBS1
Video signal Input
IN
61
CVBS2
Video Signal Input
IN
62
GND-A
63
DAT3
Data bus 3
IN
64
DAT4
Data bus 4
IN
65
DAT5
Data bus 5
IN
66
DAT6
Data bus 6
IN
67
DAT7
Data bus 7
IN
68
DAT2
Data bus 2
IN
69
DAT1
Data bus 1
IN
70
DAT0
Data bus 0
IN
71
ADDR0
Address bus 0
OUT
72
ADDR1
Address bus 1
OUT
73
ADDR2
Address bus 2
OUT
74
ADDR3
Address bus 3
OUT
75
ADDR4
Address bus 4
OUT
76
ADDR5
Address bus 5
OUT
77
ADDR6
Address bus 6
OUT
78
ADDR7
Address bus 7
OUT
79
ADDR12
Address bus 12
OUT
80
ADDR15
Address bus 15
OUT
CRT BOARD
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