Sanyo 20CA1Z Schematic

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/m

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, C

B, CR Input

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 differ 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)

IC702

SDRAM

(20V)

LCD PANEL

(For 20V)

(For 15V)

R/G/B (0-7)

IC701

(15V)

LCD PANEL

R/G/B (0-7)

IC801

TTL/LVDS

CONVERTER

OSD IN

152 151 150 144 149

R G B Y I

OSD_CC

OSD OUT

22 23 24 25 21

R G B Y I

RC INPUT

ASSY, PWB,

LED BOARD

I/P CONVERTER

CPU

SCREEN CONTROLLER

IIC BUS

(0-7)

Y/C DIGITAL

153

154

OSD_HD

OSD_VD

IC204

DC/DC

CONVERTER

OSD_VD

OSD_HD

IC201

IIC BUS

KEY INPUT

ASSY, PWB,

KEY BOARD

IC601

DIGITAL DECODER

ASSY, PWB MAIN

AV2 INPUT

WITH Y/C SEPARATON

Cb, Cr IN

IC301

SWITCHING IC

Cb, Cr

92/94

COMP. VIDEO/Y

AV1 I NPUT

Y IN

IIC BUS

C IN

TV COMP. VIDEO

TU201

IIC BUS

4/5

TUNER

VIDEO MONITOR OUT

13/14

IIC BUS

VIDEO COMP.

S-VIDEO

COMP. VIDEO or

S-VIDEO

IC303

VIDEO SW

VIDEO MONITOR

COMPOSITE VIDEO IN

COMPONENT VIDEO IN

COMPOSITE VIDEO IN

S-VIDEO IN

OUT

-4-

Chassis Block Diagrams

(Audio Signal Lines)

SP901

HEADPHONE

JACK

L-OUT

IC302

AUDIO AMP.

SP902

R-OUT

MUTE

CPU

IC201

RC INPUT

ASSY, PWB,

KEY INPUT

ASSY, PWB,

KEY BOARD

LED BOARD

ASSY, PWB MAIN

IC301

SWITCHING IC

AUDIO L (AV2)

IIC BUS

AUDIO L

AUDIO R

AUDIO L (AV1)

AUDIO R (AV1)

AUDIO R (AV2)

IIC BUS

AUDIO

4/5

(RIGHT)

AUDIO MONITOR OUT

(LEFT)

AUDIO MONITOR OUT

13/14

IIC BUS

AV2 INPUT

AV2 AUDIO IN

AV1 INPUT

AV1 AUDIO IN

TU201

TUNER

OUT

AUDIO MONITOR

IC Block Diagrams

-5-

IC601 < Digital Decoder with 3D YC.> TC90A92AFG

IC701 < I/P Converter Screen Controller > TC6398AF

42M

X'tal

D/A

Clock Gene.

CVBS/Y

Sync Sep.

Clamp

10bit ADC

HD/VD

Timing

27 M

ID1

S/N detection

CCD slice

X 8

27M

4fsc

DRAM

MPX

27M

8bit ADC

Digital I/F

reference

clock

3 line comb

3D comb

Motion

Det.

SCL SDA

IIC-BUS

Vertical enhance

LTI

contrast adust

delay adjust

ACC color decord TINT adjust Color adjust

ITU-R656

encode

656/601

Format

VIN3

(OSD)

VIN1

VIN2

Dat a 8bit

CLK

VD HD

Data 24bit

CLK

VD HD

FIELD

Data 16bit

CLK

FIELD

OSD

I/ F

IN 1

Video

I/ F

IN 2

Video

I/ F

RGB

RGB through mode

RGB

YCbCr

Clock Gen.

( P LL )

SDRAM(32 or 64Mbit)

CKE

CLK

YCbCr

DQM-4bit

CASN

WEN

S D R A M C

Color A djust.

H/ V Sc aling

IP- Conv .

H/ V Filter

Outline-

sharpening

RASN

CSN

DQ-32bit

BS-2bit

A-11bit

YCbCr

RGB

YCbCr

RGB

TC6398AF/ XB

Blending

Posit ioning

-correct .

LC D

I2C- I/ F

I/ F

Dat a 2 4 bit

ENAB

VD HD

CLKO

CLKI

VO UT_DISP

TFT- LCD

AGS

SYSCLK

RESETN

SDA

SCL

-Com

-6-

CPU Port Functions

Pin No. Function Name Function IN/OUT

1 VSS GND

2 BL-BRI FOR PANEL BACK LIGHT BRIGHTNESS OUT

3 PWM1 SOUND MUTE OUT

4 DISPLAY ON DISPLAY ON OUT

5POWER DOWN POWER DOWN OUT

6STAND-BY POWER ON/OFF OUT

7PANEL ON PANEL ON OUT

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 included 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 television, press the Number Key 1 on 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

[ Entering the Service Menu ]

VOLUME +

VOLUME

POSITION UP

POSITION DOWN

[ Service Adjustment ]

[ 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

11 4422 WWBBGGRR EEEENN FF77

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

11 5511 WWBBRREEDD FF77

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

11 6600 WWBBBB LL UU EE FF 44

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

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