Sansei TS4120 User manual

SERVICE MANUAL Colour Television
Product Code: 111337817
Original Version
Chassis Series: LA5-A
F5TW
FILE NO.
Model No. TS4120
Service Ref. No.TS4120-00
(Argentina)
Give complete “SERVICE REF. NO.” for parts
order or servicing. It is shown on the rating
plate at the cabinet back of the unit.
This T.V. receiver will not work properly in
foreign countries where the television trans-
mission system and power source differ from
the design specifications.Refer to the specifi-
cation table.
Specifications
Power Source . . . . . . . . .AC220V, 50Hz / 60Hz
Receiving System . . . . . .PAL (M/M, N/N), NTSC (M/M)
Channel Coverage
Antenna mode VHF: CH02-CH13, UHF: CH14-CH69
CATV mode VHF band: CH01-CH13, Mid band: CH14-CH22
Super band: CH23-CH36, Hyper band: CH37-CH64
Ultra band: CH65-CH94 and CH100-CH125
Low mid band: CH95-CH99
Video IF . . . . . . . . . . . . . 45.75MHz
Aerial Input Impedance . . 75Ω
Ext.Terminals
Video inputs: Phono jack ✕2 (1Vp - p, 75Ω)
Audio inputs: Phono jack ✕2 (436mVrms, more than 40KΩ)
Sound Output (RMS) . . . . 2W
Speakers . . . . . . . . . . . 5 cm x 9 cm x 1 pc.
Dimensions . . . . . . . . . 496 (W) ✕464 (H) ✕472 (D)mm
Weight . . . . . . . . . . . . . approx. 16.7 Kg
Specifications subject to change without notice.
JXMRR
VIDEO AUDIO MENU CH
- VOL +

Contents
-2-
Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chassis Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Service Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14
Purity and Convergence Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chassis Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-23
Safety Notice
SAFETY PRECAUTIONS
1: An isolation transformer should be connected in the
power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.
2: Comply with all caution and safety-related notes pro-
vided on the cabinet back, inside the cabinet, on the
chassis or the picture tube.
3: When replacing a chassis in the cabinet, always be
certain that all the protective devices are installed
properly, such as, control knobs, adjustment covers
or shields, barriers, isolation resistor-capacitor net-
works etc.. Before returning any television to the
customer, the service technician must be sure that
it is completely safe to operate without danger of
electrical shock.
X-RADIATION PRECAUTION
The primary source of X-RADIATION in television receiver is the picture tube.The picture tube is specially con-
structed to limit X-RADIATION emissions.For continued X-RADIATION protection, the replacement tube must be
the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous X
- RADIATION.To avoid such hazards, the high voltage must be maintained within specified limit.Refer to this ser-
vice manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits, take
necessary corrective action.Carefully follow the instructions for + B1 volt power supply adjustment, and high volt-
age check to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement is made in any area of a receiver.
Components indicated by mark in the parts list and the schematic diagram designate components in which
safety can be of special significance. It is particularly recommended that only parts designated on the parts list
in this manual be used for component replacement designated by mark . No deviations from resistance
wattage or voltage ratings may be made for replacement items designated by mark .

Chassis Block Diagrams
-3-
T611B
Q432
IC501
LA78040
VERT-OUT
T471
HV
IC802
IC801
CPU
QXXAVC479P
56
34
TUNER SAW IC201
LA76818AM
AUDIO
IC001
SDA SCL
ON-TIME STANDBY
R G B
BLK
OSD
32
31
19 20
21 22
SDA SCL
1
2
X161
A101
ANT
IF IN
5/6
SCL
SDA
R
G
B
BLK
12 11 14 15 16 17 42
EXT VIDEO IN
K1001 K1002
REAR AVIN FRONT AVIN
VIDEO VIDEO
A-L A-L
19 20
21
R G
B
7
AC
POWER
CIRCUIT
CONVERTER
TRANS
130V(MAIN HIGH)
20V(AUDIO)
12V(MAIN LOW)
24V(VERT)
9V IC202
REG.IC
5V-2
REG.IC
IC681
5VRC
2723
HORIZ-OUT
FBT
VERT.OUT
HORIZ.OUT
EXT AUDIO IN
AMP
LA4266_2W
1
AUDIO OUTPUT
51
5
Q900 CRT
IF/VIDEO/CHROMA/DEFLECTION
(WITH PLL)
FILTER
MEMORY
IIC BUS CONTROL
15
C-CAPTION IN
40
SELECTED VIDEO OUT
MAIN SIGNAL PROCESSING CIRCUIT

Chassis Block Diagrams
-4-
SYSTEM CONTROL
QXXAVC479P
15
C-CAPTION IN
IC001
*Stereo Model
only

IC Block Diagrams
-5-
IC201 < IF/Video/Chroma/Def. > LA76818A
1
DC
VOL
SW
FM
DET
23456
IF
AGC
RF
AGC
VIF
7
8910
IF
VCC 5V 11 12 13
BUS
PEAKING
CORING BLACK
STRETCH
SYNC
SEP
14 15
ABL
DC
REST
CLAMP
OSD
CONTRAST
BRIGHT
16 17 18 19 20
CONTRAST
BRIGHT RGB
MATRIX
OSD
SW
DRIVE/OUT-OFF
VCC 21 22 23
FSC/
SYNC SW
24 25 26 27
VER
RAMP HOR
VCCH
VCC
VER
C/D
HOR
OUT
PHASE
SHIFTER
AFC2
AFC1
VER
SEP
HOR
C/D
1/256
COLOR
CLAMP
LPF
ALC
+
SW
CLAMP
DEMO
PAL
SW
ACC
BPF
ON/OFF
DELAY
LINE
SW
TRAP
AFT
VIDEO
DET
TRAP
LIM
AMP
BPF
SPLL
BPF
VIDEO
AMP IF
IDENT VIDEO
SW APC1 TINT
VXO DDS APC2 DC ADS.
CLAMP
VCO
1H DELAY
HOR
VCO
FBP
2829
30
31
32 1H
VCC
33
34
353637
38
39
40
41
42
CLMP
43
4445
CLMP
V/C VCC
5V
46
47
48
4950
A2C
PLL
51
525354
Audio Output
FM Output/Selected
Audio Output
PIF AGC
RF AGC Output
PIF Input1
PIF Input 2
IF Ground
IF Vcc
FM Filter
AFT Output
Bus Data
Bus Clock
ABL
Red Input
Green Input
Blue Input
Fast Blanking Input
RGB Vcc
Red Output
Green Output
Blue Output
fsc output or C
Sync output
Vertical Output
Ramp ALC Filter
Horizontal/BUS Vcc
Horizontal Output
Horizontal AFC Filter
Flyback Pulse Input
VCO IREF
Clock (4MHz) Outupt
CCD Vcc
CCD Filter
CCD/Horizontal Ground
SECAM B-Y Input
(Cb Input)
SECAM R-Y Input
(Cr Input)
Chroma APC2 Filter
Clamp Filter
4.43 MHz Crystal
Chroma APC1 Filter
Selected Video Output
Video/Vertical/BUS Ground
External Video Input(Y-IN)
Video/Vertical Vcc
Internal Video Input (S-C IN)
Black Level Detector
Video Output
VCO Filter
VCO Coil 2
VCO Coil 1
APC Filter
Ext. Audio Input
SIF Output
SIF APC Filter
SIF Input

IC Block Diagrams
-6-
IC201 <IF System Block Diagram> LA76818A
11 12
BUS
Interface
SAW 5
6
4
8 7
PIF
In1
PIF
In2
IF In
9V
30K
RF AGC
Out
120K
IF VCC
IF
GND
VIF AMP
VIF 1 VIF 2 VIF 3
IF AGC
Drive
RF
AGC 2ndIF
AGC
RF AGC
Delay
6bit
IF AGC
Def
1bit
+
-
(6 Vcc)/7
To
BUS
3
0.022u PIF
AGC
IF
AGC
Data Clock
APC
Det
+π/4
-π/4
Snd
Det Amp
52
SIF.Out
Sound
Trap
Video
Det
Buzz
Canceller
50 APC
Filter
330
0.47u +
PLL Pull-in SW
To
BUS
Lock
Det
Video.Level
3bit
Amp
54
10p SIF.In
Sound
BPF
VCO.Coil
VCO
COIL1 VCO
COIL2
48 49
VIF
VCO Chroma
Counter
B/N INV IF
Ident
OSC
C/D
Amp
SIF. Sys
2bit pre-
scaller
SIF
VCO
500K
BPF
SIF
APC
Filter
1K
0.01u 1000p
53 LIM
AMP FM
Det
FM.Level
5bit
Chroma
C/D
APC
Det
500K
Det
To
BUS
Chroma
VCO
VIF
Counter
Reset
Pulse
VCO
Ident
VIF.Sys
2bit Phase
Detector
A.MUTE
1bit VOLUME
D/A
VOLUME
Filter
A.SW
1bit
Input
Select VOLUME
(ATT)
-
+
-
+
2.5V
Amp
FM Gain
1bit Deem-TC
1bit
De-
emph
FM Mute
1 bit
2
9
46
51
1
A.Fil.Def
1bit
VOLUME
7bit
47
VCO
Alignment
AFT 10 AFT
Vcc
100K
100K
0.1u
VCO
Filter
+
0.47u
Audio.out
+
Audio in
10u
Video
Out
FM
Filter
+
1u
FM
Out
0.01u
+
to BUS Line
+

IC Block Diagrams
-7-
IC001 < Audio AMP. > LA42052-E
123
PRE
GND
46789
NC
10
AMP
5
POWER
GND
NC FILTER NC
VCC
INPUT OUT
PUT
NFL
30KΩ
300Ω
Thermal
Protection
-
+AMP
Pump
Up
1
INVERTING INPUT
2
Vcc
3
PUMP UP OUT
4
GND
5
Ver. OUTPUT
6
OUTPUT STAGE Vcc
7
NON INV. INPUT
IC501 < Vertical Output > LA78040N, TDA9302H

MENU CH
-8-
Service Adjustments
S1.00110000 S2.11111000
ADDRESS DATA
02 H-PHA 08
Item No. Item Data value
General
This set has an On-screen Service Menu system includ-
ed in the CPU thar allows remote operation for most of
the service adjustments.
Service Adjustment-1
1. Enter the Service Menu
While pressing the MENU button on the televi-
sion, press the Number Key 2on the remote control
unit.The Service Menu now appear.
2. Service Adjustments:
Press the CHANNEL UP or CHANNEL DOWN
button on the remote control handset to select the
desired service menu item you want to adjust.
Use the VOLUME + or - to adjust the data.The + or
- button will increase or decrease the data
sequentially.
3. Exit from the Service Menu
Press the MENU button to turn off the Service Menu
display.
The data which is set in the service mode is stored
into the memory IC automatically.
[ Service Mode Display ]
[ Entering the Service Menu ]
VOLUME +
VOLUME -
CHANNEL UP
CHANNEL DOWN
[ Service Adjustment ]
[ Exit from the Service Menu ]
MENU
MENU

-9-
Service Adjustments
No. Item Initial value Range Description
01 RFAGC 06 00~63 RF AGC adjustment
02 H-PHA 08 00~31 H-PHASE adjustment (50Hz)
03 V-POS 32 00~63 Vertical position adjustment (50Hz)
04 V-SIZ 54 00~127 Vertical size adjustment (50Hz)
05 V-SCO 17 00~31 Vertical-S compensation (50Hz)
06 VLIN 15 00~31 Vertical linearity adjustment (50Hz)
07 H-P60 +4 -16~+15 Difference value of H-PHASE adjustment (60Hz)
08 V-P60 0 -32~+31 Difference value of V-POSITION adjustment (60Hz)
09 V-S60 +1 -64~+63 Difference value of V-SIZE adjustment (60Hz)
10 VSC60 0 -16~+15 Difference value of Vertical-S compensation (60Hz)
11 VLI60 +1 -16~+15 Difference value of Vertical linearity adjustment (60Hz)
12 OSDHP 30 01~255 OSD horizontal remark position
13 OSDC 50 00~127 OSD contrast
14 V-SCP 07 00~07 V-SIZE COMP (50Hz)
15 SBIAS 70 00~127 Sub Bias adjustment
16 RBIAS 00 00~255 Red Bias adjustment
17 GBIAS 00 00~255 Green Bias adjustment
18 BBIAS 00 00~255 Blue Bias adjustment
19 RDRIV 63 00~127 Red Drive adjustment
20 GDRIV 07 00~15 Green Drive adjustment
21 BDRIV 63 00~127 Blue Drive adjustment
22
-- -- -- White balance (a lateral line)
23 DRV
-- -- Brightness and dark of White balance adjustment
24 B-YD 10 00~15 B-Y DC Level
25 R-YD 10 00~15 R-Y DC Level
26 B-YND 0 -16~+15 Difference value of NTSC B-Y DC Level
27 R-YND 0 -16~+15 Difference value of NTSC R-Y DC Level
28 G-YA 00 00,01 G-Y Angle
29 RBGB 08 00~15 R-Y/B-Y Gain Balance
30 RBAG 08 00~15 R-Y/B-Y Angle
31 G-YAN 00 00,01 Difference value of NTSC G-Y Angle
32 RBGBN 0 -8~+7 Difference value of NTSC R-Y/B-Y Gain Balance
33 RBABN 0 -8~+7 Difference value of NTSC R-Y/B-Y Angle
34 COGV 01 00~03 Coring gain
35 BLK 03 00~03 BLK. STR. Start (W/Defeat)
36 BLKG 03 00~03 BLK. STR. Gain
37 BRTA 00 00, 01 BRT. ABL Defeat
38 BRST 00 00, 01 Mid. Stp. Defeat
39 BRTH 00 00~07 Bright. ABL.Threshold
40 WPL 00 00~03 WPL Ope. Point (W/Defeat)
41 YGAM 00 00~03 Y Gamma Start
42 PORW 00 00, 01 AV Mode Pre/Over SW
43 PORS 02 00~03 AV Mode Pre/Over-shoot adjustment
44 RFCO 0 00~03 Difference Value of RF Corring Gain
45 PORWN 01 00, 01 RF Pre/Over SW
46 PORSN 03 00~03 RF Pre/Over-shoot adjustment
47 TINT 0 -16~+15 Tint
48 SHRF 0 -16~+15 Difference Value of RF Sharpness
49 TEXC 08 00~127 OSD Text Contrast
50 AUFL 00 00, 01 Auto. Fresh
On-screen Service Menu
Following table shows the initial values which have been stored in the CPU ROM, and items for the service
adjustments.
To be continued.

-10-
Service Adjustments
Important Notice:
Do not attempt to adjust service adjustments not listed on below otherwise it may cause loss of performance and for
correct operation.
No. Item Initial value Range Description
51 COOP 07 00~07 Colour Killer
52 Y-APF 01 00, 01 Y-APF Select
53 DEEM 00 00, 01 De-emphasis TC
54 V-LVL 04 00~07 Video Level
55 FMLVL 16 00~31 FM Level
56 TTEST 00 00~07 Trap Test
57 IFOM-S 00 00, 01 Over Mod. SW
58 IFMN-S 00 00, 01 Audio Monitor SW, Monitor/FM
59 IFTRPS 01 00, 01 IC Built-in SIF Trap ON/OFF
60 IFMLVL 136 00~255 Video Level Coarse Adjustment & Mod. Operating Dot Setting
61 VBSW 00 00, 01 VBLK SW
62 FBTS 00 00, 01 FBP Blanking SW
63 HBLKL 06 00~07 H-Blanking Control Left
64 HBLKR 04 00~07 H-Blanking Control Right
65 AFCRF 00 00, 01 Adjustment of AFC Gain & Gate (RF)
66 VSURF 00 00, 01 Adjustment of Vertical Sync. Separation Sensitivity (RF)
67 CDMRF 00 00~07 Vertical Count Down Loop Adjustment (RF)
68 AFCAV 00 00, 01 Adjustment of AFC Gain & Gate (AV)
69 VSUAV 00 00, 01 Adjustment of Vertical Sync. Separation Sensitivity (AV)
70 CDMAV 00 00~07 Vertical Count Down Loop Adjustment (AV)
71 HLK-T 00 00, 01 H-lock, V-Det. (RF)
72 HLK-V 00 00, 01 H-lock, V-Det. (AV)
73 VCO-SW 00 00, 01 C. VCO Adjustment SW
74 VCOADJ 03 00~03 C. VCO Adjustment
75 GRAY 00 00, 01 Gray Mode
76 CROSS 00 00~03 Cross Black/White
77 HL-SW 01 00, 01 Half Tone ON/OFF
78 HL-TON 00 00~03 Half Tone Level
79 AVNCON 64 00~127 Contrast (No Signal in AV)
80 AVNBRI 64 00~127 Brightness (No Signal in AV)
81 POMT 12 00~127 Power Mute Time
82 CHMT 12 00~31 Channel Mute Time
83 SYST 03 00~255 System-N
84 RELAY 80 00~255 Power Relay Time
85 CCD 31 00~31 Horizontal Remark Position Compensation Register
86 TVAVTM 00 00~255 AV/TV Mute Time