Sanyo CE20LM5 User manual

Part No. 1KA6P2P0068-- N4FB AUG 2008
Colour Monitor
Service Manual
Model CE20LM5
Service Ref. No. CE20LM5-00
PRODUCT CODE: 113002801
ORIGINAL VERSION:Chassis No.UK6-A
Give complete "SERVICE REF. NO." for parts
order or servicing, it is shown on the rating sheet
on the cabinet back of the TV set.
Note
This TV receiver will not work properly in foreign
countries where the television transmission
system and power source differ from the design
specifications. Refer to the specifications for the
design specifications
CE20LM5
Contents
Safety precautions/Specifications ..................................................................................................................2
Service menu access......................................................................................................................................3
Hotel and Option Menus ................................................................................................................................4
Others Menu and ADC calibration ..................................................................................................................5
Colour Temperature adjustment and Picture Mode setting ............................................................................6
Teletext brightness and Factory reset ......................................................................................................................................7
Options and settings ......................................................................................................................................8
Signal block diagram ....................................................................................................................................10
Power Flow diagram ....................................................................................................................................11
Cabinet Parts List ........................................................................................................................................12
Cabinet Disassembly ....................................................................................................................................13
Pin description of semiconductors ................................................................................................................14
Part description and reading of schematic diagram ....................................................................................15
Electrical Parts List ................................................................................................................................16, 17
Schematic Diagram is included in this Service
Manual.

SM5111106-00

2
SAFETY PRECAUTION
PRODUCT SAFETY NOTICE
SPECIFICATIONS
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 .
!
!
!
1: An isolation transformer should be connected in the
power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.
2: Comply with all caution and safety-related notes
provided on the cabinet back, inside the cabinet, on
the chassis or the LCD panel.
3: 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, isolation resistor-capacitor networks
etc. Before returning any monitors to the customer,
the service technician must be sure that it is completely
safe to operate without danger of electrical shock.
Important recycling information.
Your SANYO product is designed and
manufactured with high quality materials
and components which can be recycled
and reused.
This symbol means that electrical and
electronic equipment, at their end-of-life,
should be disposed of seprately.
In the European Union there are separate collection systems for
used electrical and electronic products.
Please help us to conserve the environment we live in!
Note: This symbol mark and recycle system are applied only to
EU countries and are not applied to other countries of the
world.
RoHS
.This product does not contain any hazardous substances prohibited by the RoHS Directive.
(You will find “R” or “Z” at the last digit of the serial number or an “RSF” label near the rating plate on
the RoHS compliant product.)
WARNING
.You are requested to use RoHS compliant parts for maintenance or repair.
.You are requested to use lead-free solder .
!
!
Power source AC 220~240V 50Hz
Television system System I
Colour system PAL/NTSC4.43 (PAL/NTSC4.43/NTSC3.58 IN AV MODE)
Receiving channel UHF: #21~69
VHF: A-J E2-E12
CATV: X,Y,Z,S1-S41
Aerial input impedance 75ohm
Rear AV terminal
SCART: CENELEC standard
INPUT: Composite video, RGB and Audio L/R
OUTPUT: TV-output with composite video and audio L/R
Sound output(Music) N/A
Contrast ratio 600:1
Display resolution 640 x 480 (VGA)
Dimensions (WxHxD) 486 x 383 x 83 mm
Weight 5.2 Kg
N4FB

3
Service Menu
Procedure for accessing the service menu:
MENU, 3, 6, 0, 9
Factory Menu
Source SCART shows the current input mode
ADC ADJ to access the ADC auto calibration menu
Picture Mode to access the picture preset adjustment menu
Colour Temp to access the white balance adjustment menu
TTX Brightness to access the text brightness preset level adjustment menu
Other to access other availible adjustment options
Model B/S to select the model characteristics (betting shop or CCTV)
Factory Reset to perform a memory reset to restore default values
Version : 1.01 indicates the current software version loaded
05 / 07 / 08 indicates the issue date of the software version
Model Option:
B/S (Betting shop) For models fitted with SCART & TUNER
CCTV (Closed circuit TV) For models fitted with BNC in & out
Also some menu's & options will not be accessible in the CCTV mode.
Use P+ / P- on the remote to highlight the desired item, then use Vol + to enter or change the item.
With the set turned ON, press the following sequence of buttons on the remote control:-
The main service menu will be displayed on screen.
Changing the model option will automatically alter some of the settings to suit
the requirements of the application.
N4FB

4
Hotel Menu
Hotel
Hotel Mode Off Turn ON to disable RF channel tuning facility
Volume Max 100 set value between 0 and 100 to limit the sound output availible from speaker
On Program SCART set the desired input or channel that will appear at switch on
Use P+ / P- to select item and Vol+ / Vol- to change data.
To enter the Hotel Menu press & hold the GREEN button on the remote for about 5 seconds,
the Hotel menu will appear at the bottom of the screen.
Hotel mode allows the owner to restrict the functionality of the set so that the user may not tamper
Volume max' allows the owner to set a limit to the maximum sound output to prevent noise disturbance.
with settings such as channel tuning.
Option Menu
This menu is used to enable or disable certain functions availible in the bios.
To enter the Option menu press and hold the GREEN button on the remote for about 5 secs, first the
HOTEL menu will appear. Now press and hold GREEN for a further 5 secs, now the OPTION menu
will appear. Only the highlighted items may be accessed by the user.
Tuner option On Allows RF tuning. (not availible in CCTV mode)
Sound option Off Allows sound output to loudspeaker (if fitted)
SCART option On Allows inputs by SCART connector (not availible in CCTV mode)
BNC option Off Allows inputs by BNC connector (not availible in B/S mode)
PC option Off Allows VGA input from PC (if VGA connector fitted)
Auto shut off AV On Enables Auto shut off operation in AV mode
RGB option On Allows RGB input from SIS network via SCART (B/S model only)
Text no signal On Prevents loss of Text stability with no signal
Blue back Off Enables Blue Background operation during no signal condition.
to change the state.
Use P+ / P- on the remote to highlight the desired item, then use Vol+ / Vol-
N4FB

5
Other Menu
SCART Brightness 164
Black Stretch 100
OSD Transparency Off
Gamma 2.3
TTX H Position 90
TTX V Position 0
Peaking Level : RF 18
Peaking Level : Scart 16
Peaking Level : Svideo 16
Peaking Level :RGB 18
Peaking Level : AV 16
Use P+ / P- to select item & Vol+ / Vol- to change value.
Can be used to equalise the picture peaking in SCART mode
Can be used to equalise the picture peaking in SVIDEO mode
Can be used to equalise the picture peaking in RGB mode
Can be used to equalise the picture peaking in AV mode
Allows the Gamma curve to be altered if required
Can be used to centralise the Teletext horizontally
Can be used to centralise the Teletext vertically
Can be used to equalise the picture peaking in RF mode
This menu contains some items that should not normally require adjustment.
Controls brightness of composite video inputs independantly to RGB
Used to overcome the problem of crushed dark shades
Allows the OSD to become partially or fully transparent
ADC Calibration
A test signal of RGB colour bars must be applied to the SCART input for this adjustment to be
Source SCART
R-Offset 127 It is not possible to manually adjust these values
G-Offset 127
B-Offset 127
R-Gain 127
G-Gain 127
B-Gain 127
AutoTune
Press Vol + to begin auto Calibration
The ADC ADJ menu is accessible from the main service menu.
performed. If the result is successful, OK will be displayed at the bottom of the OSD.
ADC calibration is performed automatically by pressing Vol + key whilst the ADC menu is displayed.
This adjustment is not required for the CCTV model.
N4FB

6
Colour Temperature
Source SCART
Colour Temp Normal
R-Gain 128
G-Gain 128
B-Gain 128
R-Offset 128
G-Offset 128
B-Offset 128
Method
Use P+ / P- to select item and Vol+ / Vol- to change value.
If the Grey scale suffers from a predominant tint use the R, G, B Offset adjustment to neutralise,
in this case the white level adjustment should be re-checked.
the pictures' white balance.
If a suitable colour analyser is availible adjust the co-ordinates to X= 0.290, Y= 0.290 (+/- 0.01)
Keeping one colour constant, adjust R, G, B Gain value to achieve a pure white image.
Connect a 100% white test signal to either SCART or Aerial input and set picture mode to STANDARD
Enter the service mode & select Colour Temperature option.
Red adjustment (grey scale)
Green adjustment (grey scale)
Blue adjustment (grey scale)
The Colour Temperature menu is accessible from the main service menu and is used to adjust
Red adjustment (white level)
Green adjustment (white level)
Blue adjustment (white level)
Picture Mode
as required.
Source SCART
PIC Mode Standard
Contrast 42
Brightness 48
Colour 45
Sharpness 25
The predetermined settings for the fixed picture modes can be adjusted using this Menu.
Select the PIC Mode desired to be changed using P+ / P- and Vol+ / Vol- change the value
N4FB

7
Text Brightness
MAX 63
MID 42
MIN 21
The three predetermined levels set for Teletext brightness control can be adjusted in this menu.
Use P+ / P- to select item & Vol+ / Vol- to change value.
Factory Reset
In certain circumstances it might be useful to restore the memory to the default conditions
preset within the system bios.
To do this enter the main factory menu and select the "Factory Reset" option.
Press vol+ to proceed with the initialisation.
This reset does not affect the ADC calibration or the White balance adjustment settings,
nor does it clear the stored RF channels.
N4FB

8
OPTIONS & SETTINGS
The table below shows the correct factory settings for this model.
Some of these items may need to be restored if a ‘Factory Reset’ is performed.
N4FB
PIC MODE CONTROL N4FB
Standard
Contrast 42
Brightness 48
Colour 45
Sharpness 25
Movie Contrast 36
Brightness 48
Colour 54
Sharpness 22
Vivid Contrast 52
Brightness 48
Colour 55
Sharpness 48
User Contrast 50
Brightness 48
Colour 50
Sharpness 49
Picture Picture mode Standard
TXT Brightness mid
Sound Volume N/A
Advance Child Lock Off
3D NR Off
Colour System Auto
TTX Language West
OSD Setup Language English
Time out 15
TV Setup Colour system Auto
Sound system I
AFT On

9
N4FB
OPTIONS & SETTINGS continued
Factory Model B/S
Hotel Hotel Mode Off
Volume max 100
On Program SCART
Options
Tuner option On
Sound option Off
SCART option On
BNC option Off
PC option Off
Auto shut off AV On
RGB option On
Text no signal On
Blue Back Off
TTX Bright
Max 63
Mid 42
Min 21
Other SCART Brightness 164
Black Stretch 100
OSD Transparency Off
Gamma 2.3
TTX H Position 90
TTX V Position 0
Peaking Level RF 18
Peaking Level Scart 16
Peaking Level Svideo 16
Peaking Level RGB 18
Peaking Level AV 16

10
SIGNAL BLOCK DIAGRAM
N4FB
MST96885CLD
U10
Audio
Amplifier
MP7720
U5
Backlight
LCD panel
EEPROM
U9
Flash ROM
U11
IR Sensor
&LED
SCART
CN2
BNC in/out
CN1
Tuner TU1
PC (VGA)
CN3
PC/Video Audio input SCART Audio input Tuner Audio input SCART Audio output
CVBS input PC Video input
Tuner Video input
TTL /LVDS
SCART-RGB/SIS input
SCART-S-VIDEO
input
SCAR-CVBS input
ADC+
GPIO
2-Wire Bus
Speaker
DDC EEPROM
U3
User
Keypad
SDRAM
U12
GPIO
RS232
Power Module /Inverter
Video signal
Audio signal Control signal
Input unit process unit Output unit
Icon explaining
RS232
Audio in
CN4
Loop
Video Switch
U1
CVBS input SIS CVBS input
Hotel-IR
ISP
CN11