Casio TV-M430S Troubleshooting guide

R
(without price)
AUG. 2002
TV-M430S
TV-M430S
INDEX
Ver. 1 SEP. / 2002

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ....................................................................................... 2
SETTING THE SYSTEM SELECTOR ........................................................... 3
ADJUSTMENT............................................................................................... 4
DISASSEMBLY ........................................................................................... 10
PRINTED CIRCUIT BOARDS ..................................................................... 13
EXPLODED VIEW ....................................................................................... 15
PARTS LIST ................................................................................................ 16
SCHEMATIC DIAGRAMS ........................................................................... 17

— 1 —
SPECIFICATIONS
1. Type LCD Color Television
2. Reception Frequencies UHF: UHF band
CH 21 – CH 69 (CCIR, O.I.R.T., F.O.T.)
CH 21 – CH 68 (U.K.)
CH 13 – CH 57 (CHINA)
VHF: VHF band
CH 2 – CH 12 (CCIR)
CH 1 – CH 12 (CHINA, O.I.R.T.)
CH 4 – CH 9 (F.O.T.)
3. Display Element: High resolution color liquid crystal display (TN Type)
4. Drive System: TFT active matrix system
5. Screen Size: 4.0 inches
6. Backlight: High luminance fluorescent material
7. Antenna: Rod antenna (VHF, UHF)
8. Speaker: 11/8ø inches (28 mm) x 1
9. Connection Terminals: Earphone jack (3.5ø mini)
External power source jack (DC IN 12V)
Audio/Video input jack (3.5ø mini)
External Antenna jack (3.5ø mini)
10. Power Supply: 2-way power supply system
AC: AC adaptor AD-K1200 (option)
Car battery: Car battery cord CA-K1200 (accessories)
11. Power Consumption: Approx. 6.8 W
12. Ambient Temperature Range: 32°F (0°C) ~ 104°F (40°C)
13. Dimensions: 14.6 x 3.4 x 12.0 cm
14. Weight (excluding batteries): Approx. 340 g
Item Specification

— 2 —
SETTING THE SYSTEM SELECTOR
You can set the TV to receive signals for any one of seven different television systems. This means that the
TV can be adjusted to suit the tuning requirements of almost any geographic area in the world.
Setting the Color system selector and TV system selector
Find the name of the country where you will be using the TV
in the table below, and then set your TV’s color system
selector and TV system selector accordingly.
COLOR
SECAMPAL
TV SYSTEM
D,K’/KB/G,H
Area
(Angola) / Hong Kong /(Ireland) / (Lesotho) / (South Africa) / U.K.
Afghanistan / (Albania) / Algeria / (Australia) / Austria / Bahrain /
Bangladesh / Belgium / Bosnia Herzegovina / Brunei / Cambodia
/ Cameroon / (Croatia) / Cyprus / Denmark / Ethiopia / Finland /
Germany / Ghana / Gibraltar / Greenland / Iceland / India /
(Indonesia) / Israel / Italy / Jordan / Kenya / Kuwait / (Laos) /
(Libya) / (Lithuania) / Luxembourg / Macedonia / Malaysia /
Maldives / Malta / (Monaco) / Mozambique / Nepal / Netherlands
/ (New Zealand) / Nigeria / Norway / Oman / Pakistan / Papua
New Guinea / Portugal / Qatar / (San Marino) / Seychelles / Sierra
Leone / Singapore / Spain / Sri Lanka / Slovenia / Sudan /
Swaziland / Sweden / Switzerland / Syrian Arab Republic /
Tanzania / Thailand / Turkey / Uganda / United Arab Emirates /
Yemen / (Yugoslavia) / Zambia / Zimbabwe
Albania / Italy
Cyprus / Egypt / Equatorial Guinea / Greece / Iran / Iraq / Lebanon
/ Mauritania / Mauritius / (Morocco) / Saudi Arabia / Tunisia
China
Hungary / North Korea / Poland / (Romania)
Benin / Burundi / Chad / (Congo) / Djibouti / Gabon / Guadeloupe
/ Guiana / (Ivory coast) / Madagascar / Mali / Martinique / New
Caledonia / Niger / Polynesia / Senegal / St.Pierre & Miquelon /
Togo
(Azerbaijian) / Belarus / Bulgaria / Burkina Faso / Czech / Estonia
/ Georgia / (Kyrgyzstan) / Latvia / (Lithuania) / (Moldova) /
Mongolia / Russia / Slovak / (Tajikistan) / (Turkmenistan) /
(Ukraine) / (Uzbekistan)
Channel
UK
CCIR
ITALY
CCIR
CHINA
O.I.R.T.
F.O.T.
O.I.R.T.
Color
system
selector
PAL
PAL
PAL
SECAM
PAL
PAL
SECAM
SECAM
TV
system
selector
I
B/G,H
B/G,H
B/G,H
D,K’/K
D,K’/K
D,K’/K
D,K’/K
* Countries in ( ) may have reception restrictions.

— 3 —
BLOCK DIAGRAM
L-PCB
VCC1-2
EXT VIDEO AUDIO2
EXT AUDIO
EARPHONE
VCC8
VIDEO2
LCM
R,G,B
R,G,B
EXTANT
VCOM
VCC7
AFT
TU
VCOM
TU R-Y
B-Y
R-Y
B-Y
R-Y
B-Y
VCC1-2
AC ADAPTER 12V 9V
KEY-PCB
CAR BATTERY 12V
VCC8
7.8V
LAMP
CN401
BV,BU
FRPC-SYNC
CN700
VIDEO1
AUDIO1
VIDEO2
VIDEO2
VCC6
VCC5-1
VCC2-5
GND
VEE1
MCLK
CLR
OE
SRTL
SRTR
RESET
GSRT
GPCK
GRES
HCNT
ANT
TUNER
(TEPM5-01)
IF
AMP
SAW
FILTE
R
TUNING
BT AMP
(BA10358F)
POWER/BAND SW
DC/DC
CONVERTER
TRANS
(CEE98-**)
TUNING
CONTROLLER
(AN5707NFAP)
CHOPPER
1CHIP 7.8V
9V REGULATOR
NJM78M09DL1A
9V REGULATOR
NJM78L09UA
VCC7(30V)
VCC5(13.5V)
VCC3(7.5V)
VCC2(5V)
VDD(3V)
VEE1(-15V)
CHOPPER
BL 7.8V
INVERTER
TRANS
(C-81**)
DC/DC
CONTROLLER
TFT
CONTROLLER
(CM7021L4)
IH DELAY LINE
(LC89950)
VIF/SIF/VIDEO/CHROMA
(LA7688)
AV JACK AUDIO
VOL AUDIO AMP
(NJM386BD)
SECAM
(LA7642N)
VCOM AMP
(NJM3414AM)
LCD
INTERFACE
(RB5P0020M)
TFT LCD
559*220
COD40T4027LN
GATE DRIVER
SOURCE
DRIVER SOURCE
DRIVER
VCC2
UP/DOWN
CH CALL
GND CH CALL
KEY
CH UP
KEY
CH DOWN
KEY

—4 —
ADJUSTMENT
1. VCC2 adjustment, VCC9, VCC8, VCC7, VCC5, VEE1, VDD, VCC1-2 voltage check
2. Free running frequency adjustment
3. Bright, contrast adjustment for 1 chip
4. COLOR adjustment
5. Bright, Contrast adjustment
6. Current consumption check
Preparations
1. Adjust the above items 1 through 5 with the dummy load.
Adjustment And Test Point Locations
Top View Bottom View
VR303
VR301
VR502
VR700
VR101
VR511
P105
P155
P151 P154
P131
P141
P702
P703
P704
P181
P304
P510
P307
P300
P152
P171
P303

—5 —
Adjustment procedures
1. VCC2 adjustment, VCC9, VCC8, VCC7, VCC5, VEE1, VDD, VCC1-2 voltage check
•Condition
Power supply: VCC1-1(P105) = 13.50 ±0.05 [V]
•Adjustment
Apply 13.50 ±0.05 [V] on VCC1-1(P105).
Adjust VR101 so that VCC2 (P154) voltage becomes 5.00 ±0.05 [V].
As the dummy load, connect the following.
VCC2 (P154) to GND = 1.3 KΩ
VCC5 (P152) to GND = 22 KΩ
VEE1 (P155) to GND = 150 KΩ
•Checking
VCC9 (P141) = 7.8 ±0.3 [V]
VCC8 (P131) = 7.8 ±0.3 [V]
VCC7 (P151) = 30.0 ±2.0 [V]
VCC5 (P152) = 13.5 ±1.0 [V]
VEE1 (P155) = –15.0 ±1.0 [V]
VDD (P171) = 3.0 ±0.1 [V]
VCC1-2 (P181) = 9.0 ±0.3 [V]
•Block diagram
VDigital
Voltmeter
L-PCB
Stabilizer
VCC1-1
VCC9
VCC8
VCC7
VCC5
VCC2
VEE1
VDD
22KΩ150KΩ1.3KΩ
VCC1-2

— 6 —
2. Free running frequency adjustment
•Conditions
(1) Signal
No signal (PAL standard signal should be applied only at synchronous check)
(2) Signal level
Input electric field only at synchronous check: 70 dBµ(terminated with 75-ohm resistance),
P/S = 10 dB
(3) Other conditions
CCIR IF input only at synchronous check (input electric field with 75-ohm termination).
Power supply: VCC1-1(P105) = 13.50 ±0.05 [V]
Connect SYF terminal (P702) and GND.
Room temperature: 25 ±5 [°C]
•Adjustment
Monitoring HDB (P704) with a frequency counter, adjust VR700 so that the frequency is 15.625±0.1
[kHz].
•Caution
(1) Disconnect the wire between SYF terminal and GND. When inputting Applying IF signal, make
sure that synchronization is normal on the display.
•Block diagram
L-PCB
SYF
HD
GND
Frequency
Counter
VCC1-1
IF signal
Signal
generator
Stabilizer

—7 —
3. Bright, contrast adjustment for 1 chip
•Conditions
(1) Signal
Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 70 dBµ(terminated with 75-ohm resistance), P/S = 10 dBµ
(3) Other conditions
CCIR IF input (input electric field should be terminated with 75-ohm resistance).
Use VIDEO signal equivalent to TG7.
Power supply: VCC1-1(P105) = 13.50 ±0.05 [V]
Room temperature: 25 ±5 [°C]
•Adjustment
(1) Connect the KILLER terminal (P307) to GND (P300).
(2) Adjust the bright VR304 so that the voltage of the 1 chip G-output (P304) from the blank level to
the black level becomes 0.30 ±0.05 [V].
(3) Adjust the contrast VR301 so that the voltage of the 1 chip G-output (P304) from the blank level
to the white level becomes 0.87 ±0.05 [V].
(In case of the white 100% signal, adjust the voltage to 1.10 [V].)
•Block diagram
L-PCB
0.3V 0.87V
G output
Oscilloscope
VCC1-1
IF signal
Signal
generator
Stabilizer

—8 —
4. COLOR adjustment
•Condition
(1) Signal
Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 70 dBµ(75Ωtermination), P/S = 10 dB
(3) Other conditions
CCIR IF input (input electric field should be terminated with 75Ωresistance).
Use VIDEO signal equivalent to TG7.
Power supply: VCC1-1(P105) = 13.50 ±0.05 [V]
Room temperature: 25 ±5 [°C]
Carry out this adjustment after the Bright, contrast adjusmtnet for 1 chip.
•Adjustment
Adjust the color VR303 so that the amplitude of the fourth pulse of the B-output (P303) from the blank
level to its peak becomes 1.10 ±0.05 [V], which is the same level as that of white 100%.
•Caution
(1) Perform after Contrast adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0 ±0.1 [V].
•Block diagram
Oscilloscope
L-PCB
B output
VCC1-1
IF signal
Signal
generator
Stabilizer
1.10V