Sanyo LCD-27XA2 User manual

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 Version
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 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 .
[ 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/m2
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, CB,CRInput (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)
IF
A101
TUNER SAW
FILTER
X121 LCD PANEL
(WXGA)
KLP1 (27") KLP2 (32")
15
AV2 SCART (K1002)
R/S-VIDEO C IN
G IN
B IN
11
7
COMPISITE VIDEO/Y IN
20
19
VIDEO MONITOR OUT
S-VIDEO-C IN
19
D3901
LED
A3901 RC RECEIVER
RC-IN
ASSY,PWB, CONTROL
ASSY, PWB, SIGNAL IC101
(TDA9886)
IF-PLL
DEMODULATOR
1
2
VIF1
VIF2
17
TV
IC805
FLASH
MEMORY
IC802
MEMORY
6
5
SCL
4
SDA
COMPISITE VIDEO IN
COMPONENT CRIN
COMPONENT CBIN
COMPONENTY IN
AV1TERMINAL (K1001)
AV5TERMINAL (K1006)
CBIN (AV5)
COMPISITE VIDEO IN
AV3TERMINAL (K1003)
COMPISITE VIDEO IN
AV4TERMINAL (K1004)
16
12
AV1 VIDEO IN
7
IC1224
VIDEO SW
AV2 VIDEO IN SELECTED
VIDEO OUT
1
KD
15
IC1251
RGB SW
14
9
G/Y IN (AV2)
5
AV3 VIDEO IN
AV4 VIDEO IN 3
R IN (AV2)
12
CRIN (AV5)
8
18
G IN
B IN (AV2)
5
6B/CB
16
1
3R/CR
17
K8D
27
ASSY, PWB, SCAL
IC2001
(STV2310)
26
29
3
63
51
52
CVBS IN
C IN
G IN
B/CB IN
R/CR IN
53
22
23
24
14
2Y INAnalog
Input Stage
RGB Insertion
Input
SRC
Luma
Chroma
Separator
Standard Identifier
& Chroma Demodulator
PAL/NTSC/SECAM
Soft Mixer
Format Converter
& Output Scaler
Video Corection
Output FIFO
Line-locked Output Pixel Clock
Synchronization
& Monitoring Unit
VBI Slicer
I2C Interface
System Clock
generation DIGITAL
Y, CB, CR
OUTPUT
Pin-19~28
IC801
(STV3600)
MAIN CPU/TELETEXT DECODER 117~124
IC803
SDRAM
IC804
SDRAM
IC1801
SUB CPU
3
20
1
IC4001
(ADE3800)
ANALOG LCD
DISPLAY ENGINE
(SCALER/LVDS)
POWER KEY IN KEY IN
SW3951~ SW3955
K19J
K8J
145 132
146
153/154/155
ANALOG PB/B, PR/R,Y/G
OUTPUT
DIGITALVIDEO DECODER
33/34/38/39/43/44
27":90~99
32":77~86

-5-
Chassis Block Diagrams (Audio Signal Lines)
IF
A101
TUNER SAW
FILTER
X122
2
AV2 SCART (K1002)
6
ASSY, PWB, SIGNAL
IC101
(TDA9886)
IF-PLL
DEMODULATOR
23
24
SIF1
SIF2 8TV AUDIO OUT
AUDIO L-IN
AV1TERMINAL (K1001)
AV5TERMINAL (K1007)
AV3TERMINAL (K1003)
AV4TERMINAL (K1004)
78
9
10
IC3451
(STV8216)
AUDIO PROCESSOR &
DIGITAL SOUND DEMODULATOR
(NICAM/A2 STEREO/3D SURROUND)
1
IC1222
AUDIO SW
14
18
14
15
15
5
3
12
1
2
L-OUT
24
23
IC3501
(NJM2155)
BBE/BASS EXPANDER
SP902
K001
HEADPHONE JACK
R-OUT
AUDIO R-IN
AUDIO L-IN
AUDIO R-IN
AUDIO L-IN
AUDIO R-IN
AUDIO L-IN
AUDIO R-IN
AUDIO L-IN
AUDIO R-IN
13 R-OUT
AV3 L-IN
AV4 L-IN
AV5 L-IN
AV3 R-IN
AV4 R-IN
AV5 R-IN
AUDIO MONITOR OUT
(K1005)
19
AUDIO MONITOR OUT-L
3
AUDIO MONITOR OUT-R
AUDIO MONITOR OUT-L
AUDIO MONITOR OUT-R
L-IN R-IN
IC001
(LA4919N)
AUDIO AMP.
28
29
1
24
AUDIO R-OUT
AUDIO L-OUT 6
19
13
9
AUDIO R-OUT
AUDIO L-OUT 15/16
24/25
SP901
L-OUT KSPL
KSPR
31
29
HEADPHONE L-OUT
HEADPHONE R-OUT
1
2
27 28
L-OUT
R-OUT

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 used-
143 B3 8-pin of Scart-2 Input (AD Input)
142 B4 8-pin of Scart-3 Input (AD Input) -Not used-
141 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
1SCL I2C Bus Clock (For Tuner, IC101, IC3451 of Signal Unit)
2P3_7 TV_VGA (Not used)
3Reset Reset Input (L=Reset)
4Xout X’tal Osc. Output (10MHz)
5Vss Vss (GND)
6 Xin
X’tal Osc. Input (10MHz)
7Vcc Vcc=3.3V
8Mode Mode / Connected to Vcc
9P4_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 I2C 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 Text 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 service 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 Value
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 necessary to set the option settings and readjust the service 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.