Sanyo LCD-20CA1Z User manual

SERVICE MANUAL LCD Television
Specifications
Power Source . . . . Monitor: DC12V
AC Adapter: AC100
- 240V, 50Hz/60Hz (Output DC 12V)
Screen Size . . . . . . . . . .20 Inch (Measured Diagonally)
Picture Resolution . . . . .640 x 480=307,200 Pixels
Brightness . . . . . . . . . . .500 cd/m2
Colour System . . . . . . . .PAL, SECAM, NTSC4.43, NTSC, PAL-60Hz
Television System . . . . .B/G, DK, K’, I, M/M
Channel Coverage . . . .VHF: E2-E12, R1-R12, K1-K9, A2-A13, J1-J12
0-11, 5A (Australia), 1-11 (New Zealand)
UHF: 21-69, A14-A69, J13-J62
28-69 (Australia)
CATV: S1-S41, X, Y, Z, Z+1, Z+2
Aerial Input Impedance 75Ω
Speaker . . . . . . . . . . 5 cm ✕9 cm ✕ 2 pcs.
Sound Output (RMS). ...2W+2W
Input Terminals
AV1 (Video): Composite video Input
S-Video (Y/C Separate) DIN Jack Input
AV1 (Audio): L/R Stereo Input
AV2 or DVD (Video): Composite/Component Y, CB, CRInput
AV2 or DVD (Audio): L/R Stereo Input
Output Terminals
Video Monitor Output x 1
Audio Monitor Output: L/R x 1
Headphone Jack: Mini Stereo Jack x 1
Dimensions . . . . . . . . . . 480 (W) ✕468 (H) ✕226 (D)mm (Included Stand)
Weight . . . . . . . . . . . . . . approx. 8.0 Kg (Included Stand)
Specifications subject to change without notice
N2KVZ
FILE NO.
Model No. LCD-20CA1Z
(Australia/Middle East/Asia)
Give complete “SERVICE REF. NO.” for parts
order or servicing. It is shown on the rating label
at the cabinet back of the unit.
This T.V. receiver will not work properly in
foreign countries where the television
transmission system and power source dif-
fer from the design specifications. Refer to
the specification table.
Product Code:111372616
REFERENCE NO. SM5110675
Original Version
Chassis Series: UB3-C
Service Ref. No. LCD-20CA1Z-00

Contents
-2-
Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chassis Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CPU Port Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Service Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
On-screen Service Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mechanical Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11
Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chassis Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-21
Safety Notice
Safety Precautions
The following precautions must be observed.
1: Comply with all caution and safety-related notes provided on the cabinet back, cabinet bottom, inside the
cabinet or on the chassis.
2: 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, etc..
DO NOT OPERATE THIS TELEVISION WITHOUT THE PROTECTIVE SHIELD IN POSITION AND PROPERLY
SECURED.
3: Before replacing the cabinet cover, thoroughly inspect the inside of the cabinet to see that no stray parts or
tools have been left inside.
Before returning any television to the customer, the service personnel must be sure that it is completely safe to
operate without danger of electrical shock.
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 .

-3-
Chassis Block Diagrams (Video Signal Lines)
TU201
TUNER
ASSY, PWB MAIN
IC301
SWITCHING IC
COMP. VIDEO/Y
4
8
AV2 INPUT
COMPONENT VIDEO IN COMPOSITE VIDEO IN
AV1 INPUT
COMPOSITE VIDEO IN S-VIDEO IN
VIDEO MONITOR OUT
COMP. VIDEO or S-VIDEO
IC303
VIDEO SW 7
3
S-VIDEO
COMP.
VIDEO
1
TV COMP. VIDEO
2
19
IIC BUS
4/5
22
VIDEO MONITOR OUT
Cb, Cr
IC601
DIGITAL DECODER
WITH Y/C SEPARATON
92/94
Cb, Cr IN
85
Y
18
90
20 C
Y IN
C IN
IIC BUS
13/14
IC701
I/P CONVERTER
SCREEN CONTROLLER
IC702
SDRAM
LCD PANEL
(20V)
LCD PANEL
(15V)
(For 20V)
(For 15V)
IC801
TTL/LVDS
CONVERTER
R/G/B (0-7)
R/G/B (0-7)
IC201
CPU
IC204
DC/DC
CONVERTER
154 153
OSD_HD OSD_VD
53
OSD_HD OSD_VD
26 27
64
OSD_CC
22 23 24 25 21 R G B Y I
152 151 150 144 149 R G B Y I
OSD OUT
OSD IN
IIC BUS
Y/C DIGITAL
(0-7)
IIC BUS
IIC BUS
ASSY, PWB,
KEY BOARD
KEY INPUT
17
ASSY, PWB,
LED BOARD
RC INPUT
35

-4-
Chassis Block Diagrams (Audio Signal Lines)
TU201
TUNER
ASSY, PWB MAIN
IC301
SWITCHING IC
AUDIO R (AV2)
5
11
AV2 INPUT
AV2 AUDIO IN
AV1 INPUT
AUDIO MONITOR
OUT
AUDIO
3
16
IIC BUS
4/5
23
AUDIO MONITOR OUT
(RIGHT)
IC302
AUDIO AMP.
10
17
8
16
IIC BUS
13/14
IC201
CPU
IIC BUS
ASSY, PWB,
KEY BOARD
KEY INPUT
17
ASSY, PWB,
LED BOARD
RC INPUT
35
2
24
AUDIO MONITOR OUT
(LEFT)
AUDIO L (AV2)
9
AUDIO L (AV1)
AUDIO R (AV1)
7
AV1 AUDIO IN
AUDIO R
AUDIO L
SP902
SP901
3
1
HEADPHONE JACK
L-OUT
R-OUT
5
MUTE
3

IC Block Diagrams
-5-
IC601 < Digital Decoder with 3D YC.> TC90A92AFG
27 M
10bit ADC
CVBS/Y
Sync Sep.
Clamp
MPX
C
Cb
Cr
reference
clock
3D comb
3line
comb
Motion
Det.
ID1
S/N detection
CCD slice
42M
X'tal
Vertical enhance
delay adjust
contrast adust
ACC
color decord
TINT adjust
Color adjust
ITU-R656
encode
IIC-BUS
SCL SDA
656/601
Format
HD/VD
Timing
LTI
Clock
Gene.
D/A
X 8
SW
27M
4fsc
27M
8bit ADC
Digital I/F
4M
DRAM
IC701 < I/P Converter Screen Controller > TC6398AF
IN 2
Video
I/ F
RGB
to
YCbCr
Color A djust.
H/ V Scaling
IP- Conv.
H/ V Filt er
Outline-
sharpening
YCbCr
to
RGB
YCbCr
to
RGB
SDRAM(32 or 64Mbit)
Blending
Positioning
-correct .
µ
-Com
TFT- LCD
Dat a 2 4bit
S D R A M C
LC D
I/ F
I2C- I/ F
VIN2
RGB through mode
Data 16bit
CLK
VD
HD
FI EL D
IN 1
Video
I/ F
Data 24bit
CLK
VD
HD
FI EL D
VIN1
OSD
I/ F
Dat a 8bit
CLK
VD
HD
VIN3
(OSD)
RGB
YCbCr
YCbCr
YCbCr
RGB
CKE CLK
DQM-4bit
WEN
CASN
RASN
CSN
DQ-32bit
BS-2bit A-11bit
CLKI
CLKO
ENAB
VD
HD
VO UT_DISP
TC6398AF/ XB
SDA SCL
Clock Gen.
( P LL )
SYSCLK
AGS
LP
RESETN

-6-
CPU Port Functions
Pin No. Function Name Function IN/OUT
1VSS GND -
2BL-BRI FOR PANEL BACK LIGHT BRIGHTNESS OUT
3PWM1 SOUND MUTE OUT
4DISPLAY ON DISPLAY ON OUT
5POWER DOWN POWER DOWN OUT
6STAND-BY POWER ON/OFF OUT
7PANEL ON PANEL ON OUT
8 SCALER RESET SCALER RESET (RESET=LOW) OUT
9VDATR RESET VDATR RESET OUT
10 BL-ON PANEL ON OUT
11 SCL1 IIC BUS PRT FOR EEPROM (SCL: CLOCK) I/O
12 SDA1 IIC BUS PRT FOR EEPROM (SDA: DATA) I/O
13 P53 PANEL OPTION (HIGH=15”, LOW=20”) IN
14 P54 BASS OUT
15 AFT AFT INPUT IN
16 SENSOR-IN P-FAIL2 (FAILURE=Less than 4V) IN
17 KEY KEY INPUT IN
18 MODE1 MODE1 OUT
19 MODE2 MODE2 OUT
20 SAW SW SAW SWITCH OUTPUT OUT
21 OSD-I OSD-I OUTPUT OUT
22 OSD-R OSD RED OUTPUT OUT
23 OSD-G OSD GREEN OUTPUT OUT
24 OSD-B OSD BLUE OUTPUT OUT
25 OSD-Y OSD BLANKING OUTPUT OUT
26 P70(HD) H-SYNC. IN IN
27 P71(VD) V-SYNC. IN IN
28 OSC1 CLOCK INPUT FOR OSD IN
29 OSC2 CLOCK OUTPUT FOR OSD OUT
30 TEST TEST PORT IN
31 XIN CLOCK INPUT FOR MAIN IN
32 XOUT CLOCK OUTPUT FOR MAIN OUT
33 RESET RESET PORT (RESET=LOW) IN
34 P-FAIL1 POWER FAILURE (FAILURE=LOW) IN
35 RMT RC INPUT IN
36 BVIREADY BVIREADY IN
37 SCL0 IIC BUS PORT FOR IC I/O
38 SDA0 IIC BUS PORT FOR IC I/O
39 GND GND --
40 FORMAT2 STATUS IN
41 FORMAT2 ACK IN
42 VDD VDD 5V --

Service Adjustments
-7-
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.
On-screen Service Menu System
1. Enter the Service Menu
While pressing the MENU button on the televi-
sion, press the Number Key 1on the remote control
unit. The Service Menu now appear.
2. Service Adjustments:
Press the POSITION UP or POSITION DOWN
button on the remote control handset to select the
desired service menu item you want to adjust.
When the POSITION UP is kept pressed, ten steps of
adjustment items will step up at a time.
When the POSITION DOWN is kept pressed, ten
steps of adjustment items will step down at a time.
Use the VOLUME + or
- or number button to adjust
the data. The + or - button will increase or decrease
the data sequentially.
3. Exit from the Service Menu
Press the MENU button twice to turn off the Service
Menu display.
The data which is set in the service mode is stored
into the memory IC automatically.
SERVICE
001 PLUG PLAY 00
[ Service Mode Display ]
Title
Item No. Adjustment
Data
MENU
1
[ Entering the Service Menu ]
VOLUME +
VOLUME
-
POSITION UP
POSITION DOWN
[ Service Adjustment ]
MENU
[ Exit from the Service Menu ]

-8-
Important Notice:
Do not attempt to adjust service adjustments not listed
on above otherwise it may cause loss of performance
and for correct operation.
Service Adjustments
White Balance Adjustment
1. Receive a White Pattern.
2. Set the television to following conditions:
Brightness: Normal
Colour: Normal
Contrast: Maximum
3. Enter the Service Menu.
Adjustment Item:
142 WBGREEN
151 WBRED
160 WBBLUE
4. Decide the fixed item which is maximum value
(Example, Item 151 WBRED), select item of other 2
colours (Example, Item 142 WBGREEN or
Item 160 WBBLUE) with the POSITION UP or DOWN
button, and adjust a proper white balance with the
VOLUME + or
- button.
After adjustment, confirm white balance again by
normal picture.
Note: Adjusted data is less than the fixed data.
5. 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.
On-screen Service Menu
Item TITLE INITIAL
No. DATA
001 PLUG PLAY 00
002 TUNER SEL 00
003 IF1HSIZEL 00
004 IF1HSIZEH 80
005 IF1VSIZEL 00
006 IF1VSIZEH C0
007 IF1HSTAL 00
008 IF1HSTAH 26
009 IF1VSTAL 01
010 IF1VSTAH 08
011 NT HCUTSTAL 00
012 NT HCUTSTAH 07
013 NT VCUTSTAL 00
014 NT VCUTSTAH 05
015 NT HCUTSIZL 00
016 NT HCUTSIZH A7
017 NT VCUTSIZL 00
018 NT VCUTSIZH 79
019 IF2HSTAL 00
020 IF2HSTAH 00
021 IF2VSTAL 00
022 IF2VSTAH 00
023 IF2HCUTSTAL 00
024 IF2HCUTSTAH 0A
025 IF2VCUTSTAL 00
026 IF2VCUTSTAH 06
027 IF2HCUTSIZL 00
028 IF2HCUTSIZH A1
029 IF2VCUTSIZL 00
030 IF2VCUTSIZH 83
031 OSDHSIZEL 00
032 OSDHSIZEH B6
033 OSDVSIZEL 00
034 OSDVSIZEH 70
035 OSDPISEL 00
036 OSDHOFSTL 00
037 OSDHOFSTH 10
038 OSDVOFSTL 00
039 OSDVOFSTH 09
040 IP2MODEN 02
041 IP2MODE 02
042 FILTERSEL 00
043 FILH2YTAP1 00
044 FILH2YTAP2 00
045 FILH2YTAP3 87
046 FILH2YTAP4 87
047 FILH2YTAP5 5C
048 FILH2CTAP1 00
049 FILH2CTAP2 00
050 FILH2CTAP3 87
051 FILH2CTAP4 87
052 FILH2CTAP5 5C
053 FILV2YTAP1 85
054 FILV2YTAP2 10
055 FILV2YTAP3 2A
056 FILV2CTAP1 85
057 FILV2CTAP2 10
058 FILV2CTAP3 2A
059 FILH2ON 03
060 FILV2ON 03
061 EDG2ON 13
062 EDG2PLM 20
063 EDG2MLM 20
064 EDG2TAP 5A
065 LOHSIZEL 00
066 LOHSIZEH 64
067 LOVSIZEL 00
068 LOVSIZEH 78
069 EDG2LIM 06
070 EDG2BAI 10
071 LO1HSTAH 00
072 LO1VSTAL 00
073 LO1VSTAH 00
074 LO2ON 01
075 LO2HSTAL 00
076 LO2HSTAH 00
077 LO2VSTAL 00
078 LO2VSTAH 00
079 LRFLG1 00
080 LRFLG2 00
081 COLADJ1CONT 1B
082 COLADJ1BRIG 40
083 COLADJ1UFU C0
084 COLADJ1VFU 80
085 COLADJ1UFV 80
086 COLADJ1VFV C0
087 COLADJ2CONT 1B
088 COLADJ2BRIG 40
089 COLADJ2UFU C0
090 COLADJ2VFU 80
091 COLADJ2UFV 80
092 COLADJ2VFV C0
093 NT HSIZEL 00
094 NT HSIZEH 50
095 NT VSIZEL 00
096 NT VSIZEH 78
Item TITLE INITIAL
No. DATA
097 LO2HSIZEL 00
098 LO2HSIZEH 50
099 LO2VSIZEL 00
100 LO2VSIZEH 78
101 EXPMODE1 00
102 EXPMODE2 00
103 EXP1INA 28
104 EXP1INB 28
105 EXP1INC 28
106 EXP1IND 28
107 EXP1INE 28
108 EXP1OUTA 28
109 EXP1OUTB 28
110 EXP1OUTC 28
111 EXP1OUTD 28
112 EXP1OUTE 28
113 EXP2INA 18
114 EXP2INB 1B
115 EXP2INC 1E
116 EXP2IND 21
117 EXP2INE 38
118 EXP2OUTA 24
119 EXP2OUTB 24
120 EXP2OUTC 24
121 EXP2OUTD 24
122 EXP2OUTE 38
123 GAMWS 01
124 IF2CUTEN 01
125 VIDEOS1COL 23
126 VIDEOS1BRI 20
127 VIDEOS1CONT 3F
128 VIDEOS1SHP 16
129 VIDEOS2COL 1E
130 VIDEOS2BRI 24
131 VIDEOS2CONT 36
132 VIDEOS2SHP 08
133 VIDEOS3COL 12
134 VIDEOS3BRI 22
135 VIDEOS3CONT 1B
136 VIDEOS3SHP 03
137 NOR G 00
138 WARM G E8
139 COOL G F8
140 WBGREEN DIF 00
141 WBGREEN S 00
114422WWBBGGRREEEENNFF77
143 BBGREEN 02
144 BBGREEN DIF 00
145 BBGREEN S 00
146 NOR R 00
147 WARM R 00
148 COOL R F0
149 WBRED DIF 00
150 WBRED S 00
115511WWBBRREEDDFF77
152 BBRED 00
153 BBRED DIF 00
154 BBRED S 00
155 NOR B 00
156 WARM B EA
157 COOL B 00
158 WBBLUE DIF 00
159 WBBLUE S 00
116600WWBBBBLLUUEEFF44
161 BBBLUE 02
162 BBBLUE DIF 00
163 BBBLUE S 00
164 GAMMA 0A
165 WSVSTA 0F
166 WSVSIZE E1
167 PERR 00
168 SOUND OPT 00
169 INDONESIA 00
170 YUV COLOR 02
171 YUV TINT 00

Mechanical Disassembly
-9-
Stand Removal
1. Remove a screw and remove a stand cover.
2. Position TV face down on a padded or cushioned
surface to protect the screen and finish.
3. Remove 4 screws to take the stand off.
CAUTION: Hold the stand firmly as you remove the
last screw.
Cabinet Back Removal
1. Remove 4 screws and remove the Cabinet Back.
Note: The cabinet back may still be a little tight due to the
snaps at the other locations.
75 mm
226.2 mm
226.2 mm
480 mm
188.3 mm
424 mm
467.9 mm
Screen Center
[ Details of Dimensions ]
Snap
Snap
Snap

Mechanical Disassembly
-10-
Chassis Removal
Remove the cabinet back and shield cover and can be seen the chassis.
To remove the Shield Cover of Main PWB, remove 11 screws.
To remove the Shield Cover of Inverter PWB, remove 6 screws.
Screw
Screw
Screw
Screw
Shield Cover of
Main PWB
Shield Cover of
Inverter PWB
Screw