Sanyo 27XA2 Schematic

SERVICE MANUAL LCD Television

N2WW

FILE NO.

Model No. LCD-27XA2

(Middle East / Indonesia)

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:111376217

REFERENCE NO.SM3010098

Original Ver sion
Chassis Series: UE2-A

Service Ref. No. LCD-27XA2-00

Contents

Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Chassis Block Diagrams . . . . . . . . . . . . . . . . . . . . . . 4-5

CPU Port Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Sub CPU Port Functions . . . . . . . . . . . . . . . . . . . . . . . 7

Option Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

On-screen Service Menu System . . . . . . . . . . . . . . . . 9

Initialisation of Memory IC . . . . . . . . . . . . . . . . . . . . . 10

Protection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Service Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 11

Mechanical Disassembly . . . . . . . . . . . . . . . . . . . 12-15

Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . 16-17

Chassis Electrical Parts List . . . . . . . . . . . . . . . . . 18-33

Printed Wiring Board . . . . . . . . . . . . . . . . . . . . . . 34-40

CS

P

210

436

476

800

599

338

377

233

109

153

Safety Notice

-2-

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 particular ly recommended that only parts designated on the par ts 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 .

[ Details of Dimensions ]

(Unit : mm)

Specifications

-3-

Power Source AC100-264 Volts, 50/60Hz

Colour System PAL/SECAM/NTSC4.43/NTSC3.58/PAL-60Hz
Sound System B/G, D/K K’, I, M/M
Channel Coverage VHF: E2-E12,A2-A13,R1-R12,J1-J12,K1-K9

UHF: 21-69,A14-A69,J13-J62
CATV: S1-S41, X, Y, Z, Z+1, Z+2

Aerial Input Impedance 75 Ω

LCD Panel

Screen Size (Measured Diagonally): 27 inches
Picture Resolution: WXGA 1280 (Horiz.) x 720 (Vert.) pixels
Viewing Angles: Horiz. 176˚, Vert. 176˚
Contrast Ratio: 900:1
Brightness: 550 cd/m

2

Audio Output (RMS) 10W+10W
Speakers 6 cm x 12 cm x 2 pcs.

AV Terminals

AV1 Video: Composite video Input (RCA Jack) x 1

Audio: L/R Stereo Input (RCA Jack) x 1 set

AV2 CENELEC

Standard (Scart

Terminal)
Input: Composite video, RGB, S-video and audio-L/R
Output: Monitor-output with composite video and audio-L/R

AV3 Video: Composite video Input (RCA Jack) x 1

Audio: L/R Stereo Input (RCA Jack) x 1 set

AV4 Video: Composite video Input (RCA Jack) x 1

Audio: L/R Stereo Input (RCA Jack) x 1 set

AV5 Video: Component Y , C

B,CR Input (RCA Jack) x 1 set

Audio: L/R Stereo Input (RCA Jack) x 1 set

Audio Monitor Output: L/R Stereo Output (RCA Jack) x 1 set

Headphone Jack: Mini Stereo Jack x 1
Weight 14.1 kg (Included Swivel Stand)
Dimensions: 800 (W) X 476 (H) X 233 (D) mm (Included Tilt Stand)

Specifications subject to change without notice.

-4-

Chassis Block Diagrams

(Video Signal Lines)

LED

D3901

132

(WXGA)

LCD PANEL

A3901

RC RECEIVER

ASSY,PWB, CONTROL

SW3951~

SW3955

K19J

K8J

RC-IN

KEY IN

POWER

KEY IN

145

146

117~124

IC805

FLASH

MEMORY

IC803

SDRAM

Standard Identifier

Soft Mixer

PAL/NTSC/SECAM

& Chroma Demodulator

Video Corection

& Output Scaler

Format Converter

DIGITAL

Y, CB, CR

OUTPUT

Pin-19~28

Output FIFO

Line-locked Output Pixel Clock

KLP1 (27")

KLP2 (32")

ASSY, PWB, SCAL

IC101

IF-PLL

(TDA9886)

DEMODULATOR

IC4001

1

VIF1

VIF2

32":77~86
27":90~99

(ADE3800)

(SCALER/LVDS)

ANALOG LCD

DISPLAY ENGINE

TV

17

2

OUTPUT

ANALOG PB/B, PR/R, Y/G

33/34/38/39/43/44

VIDEO OUT

SELECTED

16

IC1224

VIDEO SW

12

7

IC801

153/154/155

1

5

IC804

SDRAM

(STV3600)

MAIN CPU/TELETEXT DECODER

IC1801

SUB CPU

1

SCL

20

IC2001

3

4

6

IC802

5

MEMORY

SDA

R

R/C

S-VIDEO-C IN

G IN

3

5

3

16

1

14

DIGITAL VIDEO DECODER

(STV2310)

63

26

K8D

KD

15

B/CB
6

8

Luma

Chroma

SRC

Input

C IN

CVBS IN

3

14

27

9

Separator

Analog

Y IN

2

29

12

IC1251

RGB SW

RGB Insertion

Input Stage

R/CR IN

51

52

23

22

18

19

G IN

Synchronization

B IN

B/C

53

24

17

& Monitoring Unit

VBI Slicer

C Interface

generation

2

I

System Clock

X121

ASSY, PWB, SIGNAL

SAW

IF

A101

FILTER

TUNER

AV1 VIDEO IN

COMPISITE VIDEO IN

AV1 TERMINAL (K1001)

AV2 VIDEO IN

COMPISITE VIDEO/Y IN

20

AV2 SCART (K1002)

B IN (AV2)

CB IN (AV5)

COMPISITE VIDEO IN

AV3 TERMINAL (K1003)

COMPISITE VIDEO IN

AV4 TERMINAL (K1004)

COMPONENT CR IN

AV5 TERMINAL (K1006)

B IN

COMPONENT Y IN

COMPONENT C

19

R IN (AV2)

R/S-VIDEO C IN

15

G IN

CR IN (AV5)

11

G/Y IN (AV2)

B IN

7

AV4 VIDEO IN

AV3 VIDEO IN

VIDEO MONITOR OUT

-5-

Chassis Block Diagrams

(Audio Signal Lines)

IC001

(LA4919N)

AUDIO AMP.

IC3501

(NJM2155)

BBE/BASS EXPANDER

SP901

KSPL

L-OUT

15/16

13

AUDIO L-OUT

6

1

AUDIO L-OUT

28

SP902

KSPR

R-OUT

9

AUDIO R-OUT

19

24

AUDIO R-OUT

29

24/25

K001

HEADPHONE JACK

L-OUT

28

1

HEADPHONE L-OUT

31

27

2

R-OUT

HEADPHONE R-OUT

29

ASSY, PWB, SIGNAL

IC101

IF-PLL

(TDA9886)

DEMODULATOR

SIF1

X122

IF

23

SIF2

SAW

A101

TUNER

TV AUDIO OUT

8

24

FILTER

78

AUDIO L-IN

AV1 TERMINAL (K1001)

9

AUDIO R-IN

10

IC3451

14

AUDIO L-IN

6

AV2 SCART (K1002)

(STV8216)

AUDIO PROCESSOR &

DIGITAL SOUND DEMODULATOR

(NICAM/A2 STEREO/3D SURROUND)

15

AUDIO R-IN

AUDIO MONITOR OUT-L

2

3

AUDIO MONITOR OUT-R

1

18

AUDIO MONITOR OUT-L

(K1005)

AUDIO MONITOR OUT

R-IN

24
23

L-IN

L-OUT

19

IC1222

AUDIO SW

AUDIO MONITOR OUT-R

AV3 TERMINAL (K1003)

3

5

1

AV3 L-IN

AUDIO L-IN

AUDIO R-IN

AV4 L-IN

2

AV5 L-IN

AV4 TERMINAL (K1004)

AUDIO L-IN

AUDIO R-IN

12

AV3 R-IN

AV5 TERMINAL (K1007)

R-OUT

13

14

AV4 R-IN

AUDIO L-IN

15

AV5 R-IN

AUDIO R-IN

Main CPU Port Functions (IC801)

-6-

Pin No. Port Name Function

131 A0 N_Reset Output (Active=H)
133 A1 Power error-1 input

10 A2 PLL Lock (Not used)

11 A3 LCD Brightness Output
135 A4 LED / For software flash
136

A5

Audio Mute / For software flash
137 A6 Control of Inverter (Active=L)
138 A7 For writing / FAN Control Check (For manufacturing process) (Active=l)
146 B0 Power ON/OFF Switch Input (AD Input)
145 B1 Key Board Input (AD Input)
144 B2 8-pin of Scart-1 Input (AD Input) -Not used­143 B3 8-pin of Scart-2 Input (AD Input)
142 B4 8-pin of Scart-3 Input (AD Input) -Not used­141 B5 AGC Input

130 C0 SDA for ADE3800 (IC4001)
129 C1 SCL for ADE3800 (IC4001)
128 C2 AV Switch-C Output
127 C3 Power-3 Output

4C4SDA for EEPROM (IC802)
3C5SCL for EEPROM (IC802)
2C6SDA for device other than EEPROM
1C7SCL for device other than EEPROM
5D0AV Switch-A Output
6D1 LCD ON (Back-Light ON/OFF) Output
7D2 50/60Hz Switch (Switching PAL/NTSC) Output

8D3AV Switch-B Output (Active=H)
132 D4 RC Input (Active=L)
147 D5 Power Switch-1 output

9D6Power error-2 Input
134 D7 Power Info. Input (Input of the power supply condition)

Sub CPU Port Functions (IC1801)

-7-

Pin No. Function Name Function

1 SCL I2C Bus Clock (For Tuner, IC101, IC3451 of Signal Unit)
2 P3_7 TV_VGA (Not used)
3 Reset Reset Input (L=Reset)
4 Xout X’tal Osc. Output (10MHz)
5 Vss Vss (GND)
6

Xin

X’tal Osc. Input (10MHz)
7 Vcc Vcc=3.3V
8 Mode Mode / Connected to Vcc
9 P4_5

10 P1_7 A Detection Input -Not used-
11 P1_6 DM Clock Output (Not used)
12 P1_5 DM Data (Not used)
13 P1_4 DM IR Send (Not used)
14 P1_3 RGB ON/OFF Output (Not used)
15 P1_2 Power4 Output
16 Vref Reference for ADC (Vcc)
17 P1_1 Timer Recording Output (H=Recording) (Not used)
18 P1_0 D/A Control Output (H=Digital)
19 P3_3
20 SDA I

2

C Bus Data (For Tuner, IC101, IC3451 of Signal Unit)

P

Option Setting

-8-

After replacing Memory IC (IC801)

The memory IC (IC802) stores the option data of TV set and service adjustments data for each circuit, therefore, when
the memory IC is replaced, it should be programmed to the following settings and “ Service Adjustment” on page 11.

1) How to enter the Option Setting Mode

Press and hold the OK button on the remote control and press the Programme Down (▼)button on the front
control panel of the TV. The option window will appear on the screen.

[ Option Setting Menu ]

2) How to make the Option Setting

Select desired option item by pressing the Programme Up or Down button.
To switch the option mode, use the Volume + or -button.
The data which is set in the option mode is stored into the memory IC automatically.

The following table shows the available option items and default setting mode.

Option Items Mode Default / Description

ON Timer ON or OFF Default “OFF”/ Disable or enable ON Timer function.
Plug & Play ON or OFF Default “ON”/ Disable or enable Plug & Play function.
Welcome Text ON or OFF Default “ON”/ Display message when first set up.
BBE ON or OFF Default “ON”/ Disable or enable BBE function on Sound menu.
Auto Volume ON or OFF Default “ON”/ Disable or enable “Auto Volume Level” function

on Sound menu.

Headphone ON or OFF Default “OFF”/ Disable or enable Headphone control on Setting

menu.
16:9 Mode ON or OFF Default “ON” / 16:9 mode.
Noise Reduction ON or OFF Default “ON” / Disable or enable Noise Reduction function on

Setting menu.
Country UK. UK&IRE or EU Default “EU” / Selection of TV system.
Raster Rotation ON or OFF Default “OFF” / Disable or enable Raster Rotation function.
SESA ON or OFF Default “OFF”.
Digital RC ON or OFF Default “OFF” / Disable or enable use of Digital RC hand-set.
Light Monitoring ON or OFF Default “OFF” / Disable or enable Light Monitoring function.
Video Mute ON or OFF Default “OFF” / Disable or enable Video Mute function.

3) Exit from the Option Mode

Press the MENU button or turn off the TV set by pressing the Power ON/OFF button.

ON Timer OFF

Plug & Play ON

Welcome T ext ON

BBE ON

Auto Volume ON

Headphone OFF

16:9Mode ON

Noise Reduction ON

Country EU

Raster Rotation OFF

SESA OFF

DIGITAL RC OFF

Light Monitoring OFF

Video Mute OFF

CS

On-screen Service Menu System

-9-

General

This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the
service adjustments.

3) Exit from the Service Menu

Press the MENU button repeatedly or turn off the TV set by pressing the Power ON/OFF button.

2) How to select the service section and ser vice item and change data value:

To select Service Section: Press the Cursor or button on the remote control hand set, and press the

OK button to enter the Sub menu.

To change data value: Select service item by pressing the Cursor or

,

and change data value by pressing

the Cursor or button.

On-screen Service Menu System

1) How to enter the Service Menu

Press and hold the Green button of the remote control and press the Programme Down (▼)button on the front
control panel of the TV, and the Main menu of service mode will be displayed.

[ Main Menu of the Service Mode ]

Software Version
Information

Service Section

P

Service

UE2 27 Ver 5.06

Sound
Video
Other
STV8216

TTDDAA99888866

STV2310
ADE3800
WSS
EEPROM Reset

TDA9886 FE

Write 1 70

[Sub Menu]

Data V alue

Item No.

Example;

Important Notice: Do not attempt to adjust service adjustments not listed on page 11, otherwise it may cause

loss of performance and for correct operation.

Initialisation of Memory IC (IC802)

-10-

Protection Circuit

How to Initialise the Memory IC

To initialise the memory IC (IC802), press and hold the Picture Mode button on the remote control, then press the
Programme Down button on the front panel of the TV set and then turn the Mains switch off and on.The initialisation

is now completed.
When initialised the memory IC and all of the setting data (option data and service adjustment data) stored in the IC
are reset to the default value. It is necessar y to set the option settings and readjust the ser vice adjustments listed on
page 11 and to re-tune all the channels.

This TV set has a built-in power supply protection circuit.
It is provided to protect the TV set in case of a power supply circuit malfunctions.When something abnormality occurs
during TV reception, the TV set goes to the stand-by mode.

When operating the Protection Circuit, the Stand-by and Power Indicator will blink.

Releasing the protective circuit and restoring power supply

To release the protective circuit and restore power supply, disconnect the AC cord for a short time. This will work only
if the power supply trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot be
restored and the circuit will have to be repaired.

-11-

Service Adjustments

Important Notice:

Do not attempt to adjust service adjustments not listed below otherwise it may cause loss of performance and for
correct operation.

AGC Adjustment

1. Receive PAL colour bar pattern.
(ANT Input Level:58dBµV 75 ohms terminated)

2. Connect a Digital Volt Meter to Tuner-AGC terminal
(TP-A) and the ground.

3. Enter the Ser vice Mode, and select item TDA9885
with ▲ or ▼ key.

4. Select sub menu Write 1 of TDA9885 with ▲ or ▼ key.

5. Adjust voltage of Tuner-AGC to become 3.2V±0.3V DC
with or key.

White Balance Adjustment

[ Setting ]

1. Connect a colour-bar generator to the external
(composite) video input terminal (AV1, AV2, AV3 or
AV4 terminal), and input a White Pattern (100%).

2. Set the television to following conditions:
Picture Mode: Dynamic
Pre-heating Time:More than 10 minutes

[ White Balance Adjustment ]

1. Enter the Ser vice Mode, and select item Other
with ▲ or ▼ key.

Adjustment Item:

No. 55 White balance R
No. 56 White balance G
No. 57 White balance B

2. Set No. 55 White balance R value to “26” with or

key .
Set 56 White balance G value to “32”with or key.
Set 57 White balance B value to “32”with or key.

3. Decide one item in three items to a fixed value
(Example, let No. 55 White balance R be fixed value),
select item of other 2 colours (Example, No. 56 White
balance G or No. 57 White balance B) with ▲ or ▼
key, and adjust to produce a normal black and white

picture in highlight areas with or key.
After adjustment, confirm white balance again by
normal picture.

Black Balance Adjustment

[ Setting ]

1. Connect a colour -bar generator to the external
(composite) video input terminal (AV1, AV2, AV3 or AV4
terminal), and input a dark gray pattern (10% white).

2. Set the television to following conditions:
Picture Mode: Dynamic
Pre-heating Time:More than 10 minutes

[ Black Balance Adjustment ]

1. Enter the Service Mode.

Adjustment Item:

No. 58 Black Balance R
No. 59 Black Balance G
No. 60 Black Balance B

2. Set No. 58 Black Balance R value to “255” with or

key .

Set No. 59 Black Balance G value to “3” with or
key .

Set No. 60 Black Balance B value to “0” with or
key .

3. Decide one item in three items to a fixed value
(Example, let No. 58 Black Balance R be fixed value),
select item of other 2 colours (Example, No. 59 Black
Balance G or No. 60 Black Balance B) with ▲ or ▼
key , and adjust to produce a normal black and white

picture in dark gray areas with or key.
After adjustment, confirm white balance again by
normal picture.

-12-

Mechanical Disassembly

AV1

AV2

AV3

A

U

D

IO

M

O

N

IT

O

R

O

U

T

L

R

AV5

Y

C

B

C

R

AUDIO

L

R

L

R

V

ID

E

O

L

R

V

ID

E

O

DVD INPUT

1. Stand Removal

1. Position TV face down on a padded or cushioned surface to protect the screen and finish.

2. Remove 2 screws and pull the stand in the direction of the arrow to remove.

AV1

AV2

AV3

A

U

D

IO

M

O

N

IT

O

R

O

U

T

L

R

AV5

Y

C

B

C

R

AUDIO

L

R

L

R

V

ID

E

O

L

R

V

ID

E

O

DVD INPUT

Cushion

-13-

Mechanical Disassembly

2. Cabinet Back Removal

Remove 11 screws and take the Cabinet Back off.
Note: Cabinet Back can be removed even if it does not remove a stand.

AUDIO MONITOR OUT

Y

C

B

C

R

L

AUDIO

R

AV5

DVD INPUT

L

R

VIDEO

VIDEO

L

L

R

R

AV1

AV2

AV3

-14-

Mechanical Disassembly

3. Chassis Removal

After removing Cabinet Back and Stand, remove 8 screws of Chassis base, remove 2 screws of ASSY, PWB,
CONTROL, disconnect each connectors and the chassis can be taken out.

ASSY, PWB, CONTROL

Speaker

Speaker

Chassis Base

ASSY, PWB, SIGNAL

How to Remove Flat Cable

There are following kinds of the connectors of flat cable. Be careful not to damage a connector in the case of removal of
a flat cable or attachment.

Type-A

For removal of flat cable, lift up the
hook of both sides.
For insert and fixing, hold down the
hook after inserting the flat cable.

Cable

Type-B

For removal of flat cable, slide the
hook of both sides.
For insert and fixing, slide the hook
to previous position after inserting
the flat cable.

Cable

Type-C

Cable

For removal of flat cable, pull off only.
For fixing, insert into the socket.

Type-D

Cable

For removal of flat cable, hold down
the hook.
For insert and fixing, lift up the hook
after inserting the flat cable.

ASSY, PWB, POWER

ASSY, PWB, SCAL

Fan Motor