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L6B TFT- LCD TV
SERVICE MANUAL
CONTENTS PAGES
Safety instructions 1
Technical specifications 2
Panel Specification 3
Back appearance of TV 5
Interconnection Diagram 5
Block diagram 6
Block diagram of power supply 7
Service mode 8
Service Mode items and values 10
Data sheet of important IC's and parts 11
Recommended Part List 23
Frequency list of channels 25
SAFETY PRECAUTIONS
GENERAL GUIDELINES There are electro-static sensitive components such
as CMOS in LCD Module. Please earth human
1. It is advised to insert an isolation transformer in the body when handle the LCD.In addition, please do
AC supply before servicing a hot chassis. not touch the interface connector pin with bare.
2. Always use the manufacturer's replacement safety
components. The critical safety components marked 8 - Do not operate for a long time under
the same pattern
with on the schematics diagrams should not be
Operating LCD for a long time under the same
by other substitutes. Other substitute may create the
electrical shock , fire or other hazards. Take pattern can cause image persistence and can
attention to replace the spacers with the originals. damage it. Please follow following guidance.
Furthermore where a short circuit has occurred , 1. Turn the power off when do not use.
replace those components that indicate evidence of 2. Change the pattern periodically.
overheating.
3. After servicing , see that all the protective devices LEAKAGE CURRENT COLD CHECK
such as insulation barriers, insulation papers, shields 1. Unplug the AC cord and connect a jumper
and isolation R-C combinations are correctly between the two prongs of the plug.
installed. 2. Turn the receiver's power switch.
4. When the receiver is not being used for a long time 3. Measure the resistance value with an ohmmeter,
of period of time , unplug the power cord of the between the jumpered AC plug and each exposed
Adaptor from the AC outlet. metallic cabinet part on the receiver. When the exposed
Color TFT LCD Module is very sensitive metallic part a return path to the chassis the reading
should be between 4Mohm and the 20Mohm. When the
both electrically and physically.Users, exposed metal does not have a return path to the chassis,
therefore, are requested to follow the the reading must be infinite.
"Guidance of handling color TFT LCD
Module"on the followings. LEAKAGE CURRENT HOT CHECK
1 -Be careful not to make scratch on the 1. Plug the AC cord directly in to the AC outlet. Do
polarizer. not use an isolation transformer for this check.
Surface of polarizer is soft and can be physically 2. Connect a 2Kohm 10W resistor in series with an
damaged easily.Please do not touch, push or rub exposed metallic part on the receiver and an earth,
such as a water pipe.
polarizer surface with materials over HB hardness.
3. Use an AC voltmeter with high impedance to
2 - Keep clean the surface.
measure the potential across the resistor.
Please wear rubber glove when touch the surface of
4. Check each exposed metallic part and check the
LCD screen. Please use soft and anti-static material voltage at the each point.
as cleaner. 5. Reverse the AC plug at the outlet and repeat each of
3 -Keep out of water.Water on/in the LCD may the above measurements.
cause electrical short or corrosion. Please wipe out 6. The potential at the any point should not exceed 1.4
dry or water carefully. Vrms. In case a measurement is outside the limits
4 -Prevent swift Temperature & Humidity specified , there is the possibility of a shock hazard ,
change.Instantaneous temperature and/or humidity and the receiver should be repaired and rechecked
change can make dew or ice which cause before it is returned to the customer.
nonconformance such as malfunction.
5 - High temperature & high humidity
reduce the life-time. HOT CHECK CIRCUIT
AC-Voltmeter
LCD is not proper to be used at high temperature
and high humidity. Please keep specified TO INSTRUMENTS
EXPOSED
temperature and humidity condition. METALLIC PARTS Water pipe
(earth)
6 - Keep out of Corrosive Gas.Corrosive gas
effect the polarizer and the circuit chemically and
cause defects accordingly. 2 K Ohm
7 - Electrostatic discharge can make
Damage
L6B TECHNICAL SPECIFICATION
Receiving System PAL B/G+I+D/K SECAM L/L'
Comb Filter Adaptive 4H\2H
LTI, CTI Filters +
DVI 1.0 Compliant +
DVI Receiver Resolution VGA to SXGA
2 Pixel \ Clk Support +
Gamma Correction 8 to 10-bit LUT
PIP\PAP\POP\PAT +
OSD Graphics Based 8-bit\pixel
Level (1.5, 2.5, Teleweb) Teletext 1.5
Teletext Type (Fast\Top\Simple) Simple, Fast, Top
Page Memory 800p
WSS +
VPS\PDC +
4:3 +
16:9 +
Picture Formats 14:9 +
(4:3, 16:9, 14:9, Panorama, LetterBox, Panorama +
Subtitle) Letterbox +
Subtitle +
Zoom +
WSS (Wide Screen Signalling) +
ATS (Automatic Tuning System) Frequency Search
Manual Search Channel Table Search
Number of Program Storage +
No Ident Timer +
Picture Freeze +
Equalizer +
AVL (Automatic Volume Level) +
Sound Status Memory +
Picture Status Memory +
Swap +
Child Lock +
Program Lock +
Picture Format Switching Tru Pin 8 +
Auto RGB Detect Tru Pin 16 +
Off Timer (Sleep Timer) +
Timer
On Timer +
Picture Smart (User, Soft, Natural, Rich) +
Sound Smart (User, Music, Sports, Cinema,
+
Speech)
Scart2 Out Selectable +
S-Video Input Through Scart2 +
2x5W for 22"W, 23"W
Audio Output Power
2x10W for 26"W
RMS in Max at 10% THD)
2x10W for 30"W
Stereo (German A2, Nicam, BTSC) German A2, Nicam
S-video In (DIN) 1
AV In (3 RCA) 1
AV Out (3 RCA) 1
PC Audio (L, R) 1
D-Sub 15 1
Headphone 1
CVBS In 4
Y\C In 1
DVI In YES
CVBS Out 4
PANEL SPECIFICATION
Sizes 22" 23" 26" 27" 30" 32"
Samsung LG- Samsung LG- Chimei AUO
Manufacturer Samsung Chimei
Philips Hannstar Philips AUO LG-Philips
Interface Single LVDS Single LVDS Singlel LVDS Singel LVDS Single LVDS Single LVDS
Resolution WXGA (1280x720) WXGA (1280x768) WXGA (1280x768) WXGA (1280x720) WXGA (1280x768) WXGA (1280x768)
Brightness (cd/m2)>= 450 450 450 550 550 450
Contrast>= 500 400 400 600 600 700
Response Time
25 25 25 25 25 23
(Tr+Tf) msec =<
Viewing Angle
85/85 85/85 85/85 85/85 85/85/85/85 85/85/85/85 85/85/85/85 85/85/85/85
R\L\H\L>=
Adaptor nput 15V 24V Built-in TV Built-in TV Built-in TV Built-in TV
PoweR consumptions 100W 100W 120W 120W 140W 180W
St-By Power
<4W <4W <4W <4W <4W <4W
Consumption
Input Range 100V-240V/50- 60Hz 100V-240V/50- 60Hz 100V-240V/50- 60Hz 100V-240V/50- 60Hz 100V-240V/50- 60Hz 100V-240V/50- 60Hz
BACK SIDE APPEARANCES
CONTROL
BOARD
SPEAKERS
POWER
SWITCH
220VAC INPUT
LED/IR BOARD
POWER SUPPLY
MAIN BOARD
CHASSIS
NOTE: LOCATION AND THE SHAPE OF IR /LED BAORD, CONTROL BOARD AND MAIN SWITCH
BOARD MAY CHANGE ACCORDING TO THE COSMETIC OF THE TV AND SIZE
TO PANEL
MAIN CHASSIS CN1
JP452 JP451 JP453 POWER
SUPPLY
MODULE
S150
SPEAKER
S2
S550 CN3 CN2
TO
PANEL
S350
S50 JP450
TO HEADPHONE JACK MAIN POWER
SWITCH
MODULE
IR RECEIVER/LED KEY BOARD
MODULE MODULE 220V AC
INPUT
L6B BLOCK DIAGRAM
Video-Main
RF In SDRAM
Video Decoder
Multi Standard
IF IC TDA9886T
SAA7118MP
Tuner-Main MT48LC16M
QSS-Main
16 Bit
YUV PW1231
Tuner-PIP IF IC TDA9886T EEPROM
De-Interlacer
QSS-PIP
Main-Video
24C64
PIP-Video
24 Bit RGB
AV-Out Video Flash Memory
AV4 Video-In AM29VL160
Video Switch Video-PIP PW181
Video In/Out TDA6415C 16 Bit IMAGE
LVDS Transmitter
Video Decoder
Multi Standard
SAA7118MP
YUV PROCESSOR
DS090C385
De-Interlacer Progressive
SCART 1 2 3 Pin 8 Switch or Intrelaced
Scaler
Scart RGB
PCF8591 24 Bit Dual TO THE
OSD PANEL
I2C Communication RGB ,HS,VS
Micro-Cont.
Audio-In/Out
DE,PCLK
Gamma Corr.
SC1-SC2 RGB IR In
RGB Switch
Stand by
PI5V30
LED's
AV4
Reset
Audio-In
Mute
Audio-Switch B/L Enable
TDA6420 AUDIO PROCESSOR
Audio MSP3410D Digital Dim
In-Out
SVHS Y/C
48 Bit RGB VS/HS
AV Out Audio
Dual nterface for
FPD
Audio Amplifier AD9887
EEPROM
TA2024 24LC21
EEPROM
24LC21
Headphone RGB HS/VS-In
Amp. DVI Input
TDA1308
DVI Socket
PC DVI Audio -In SVHS Socket D-SUB 15 socket
Speaker
Headphone Jack
L6B POWER SUPPLY BLOCK DIAGRAM (MAIN CHASSIS)
J450
12V F450 +2,5V_STBY
U451 (5V) U454 +5V_STBY U458
FDS9933A LM2576 NCP1117
DC_IN
GND
F451 VOLTAGE
S450 DOUBLER +3,3V_STBY
12V '33V U450 +1,5V_STBY
NCP117
12V_AMP
U452
GND
FDS9933N
+5V
U457 U456 +8V
STAND_BY NCP1117 +3,3V LM317
U453 +12V U455 PANEL_POWER
FDS9933N LM2576
PNL_EN +12V_INVERTER
L6B SERVICE MENU
1. Activating the Service Menu
When the menu is on the screen press `9', `3', '0', '1' on the remote controller. This will
activate the service menu.
2. Service Menu Structure
The service menu has three items: display, calibre and version
2.1 Display
Display item has seven options:
a- Panel
Panel option gives information about the current panel resolution. It is a read only
option and can not be set.
b- Power on time
Power on time gives information about the last update time of the SW running. It
is a read only option and can not be set.
c- Backlight on time
Backlight on time option reserved.
d- Scart prescale
Scart prescale option sets the prescale values for the input sounds entering the scart
input of the MSP(Micronas Sound Processor). Changing this value you can adjust
the level of the output sound going to loudspeakers for all the sources except the
Tuners. The range is between 0 and 100.
e- nicam prescale
Nicam prescale option sets the prescale values for the Nicam standard sounds for
tuner inputs. Changing this value you can adjust the level of the output sound
going to loudspeakers for Nicam sounds entering the analog sound input of MSP.
The range is between 0 and 100.
f- fm/am prescale
fm/am prescale option sets the prescale values for the FM/AM standard sounds for
tuner inputs. Changing this value you can adjust the level of the output sound
going to loudspeakers for FM/AM sounds entering the analog sound input of MSP.
The range is between 0 and 100.
g- Agc(Automatic Gain Control) adjust
Agc adjust option sets the input voltage going to IF decoder AGC pin. Changing
this value you can adjust this voltage for optimum Tuner performance. The range
is between 0 and 31.
h- R/G/B Brightness/Contrast: These are used for color bias adjustment. The range is
Between 0 and 255
2.2 Calibre
Calibre item has nine options:
a- video format
Video format option force the video format to the desired format. Selectable
formats are Auto, Pal, NTSC and SECAM.
b- colorspace
Colorspace option gives the information about the video input colorspace input to
PW181 IC. Do not change this value unless an error occurred in the colors
displayed.
c- test pattern
This option activates the internal pattern of PW181 IC. There are 3 choices: none,
vert bars, solid color. None will deactivate the internal pattern. Vert bars choice
activates the bar pattern for the selected color component. Solid color activates the
solid pattern with one color selected in color component and also you can change
the level of the color by solid field level.
d- Color components:
This option selects the color for the internal pattern of PW181 IC. There are 4
choices: all, red, green and blue. If you choose all, you can see the white pattern
and if you choose one of the other choices you can see the test pattern with the
selected color.
e- solid field level
This option will adjust the level of the colors for the test pattern. The range is
betwwen 1 and 64.
f- Initial ATS
This option will enable or disable the Initial setup for the TV. Setting this option to
On, the TV will open from the Quick setup menu. Setting this option to Off will
disable this option.
g- factory reset
Factory reset option executes a reset operation for the NVRAM. Pressing OK
when this option is selected will erase the NVRAM and load default values to
NVRAM.
h- dpms
This option selects the Power option for the TV. Setting this option to On the TV
will switch to the last state for power on transition. Setting this to Off will disable
this option and the TV will always switch to Stand-by state while power on
transition.
i- osd timeout
This option sets the OSD timeout for the main menu structure. Selections are 5, 15
and 60 secs. The default is 60 sec.
2.3 Version
This item gives the information about the version of the software. Also you can see the
last modified time for the GUI(graphical user interface).
L6 CHASSIS SERVICE MODE ITEMS
display menu
ITEM TYPICAL VALUES/OPTIONS
panel 1280x768
power on time 03:39:45
back light time 03:39:45
scart prescale 25
nicam prescale 45
fm/am prescale 24
agc adjust 16
red brightness 128
red contrast 128
green brightness 128
green contrast 128
blue brightness 128
blue contrast 128
calibre menu
ITEM TYPICAL VALUES/OPTIONS
video format auto
color space RGB
test pattern none
color components all
solid field level 33
initial ats on
factory reset press to reset
dpms on
osd time out 60 sec
version
ITEM TYPICAL VALUES/OPTIONS
Software
SL630T_CH1_T13 L6B 1.22 Chi30
GUI
Project; L6B Toshiba
Generated Date: October 01,2004 at 22.42
TEA6415C
BUS-CONTROLLED VIDEO MATRIX SWITCH
s 20MHz BANDWIDTH
s CASCADABLE WITH ANOTHER TEA6415C
(INTERNAL ADDRESS CAN BE CHANGED BY
PIN 7 VOLTAGE)
s 8 INPUTS (CVBS, RGB, MAC, CHROMA, ...)
s 6 OUTPUTS
s POSSIBILITY OF MAC OR CHROMA SIGNAL
FOR EACH INPUT BY SWITCHING-OFF THE
DIP20
CLAMP WITH AN EXTERNAL RESISTOR (Plastic Package)
BRIDGE
s BUS CONTROLLED ORDER CODE : TEA6415C
s 6.5dB GAIN BETWEEN ANY INPUT AND OUT-
PUT
s -55dB CROSSTALK AT 5MHz
s FULLY ESD PROTECTED
DESCRIPTION
The main function of the TEA6415C is to switch 8
video input sources on the 6 outputs.
Each output can be switched to only one of the SO20
inputs whereas but any same input may be con- (Plastic Micropackage)
nected to several outputs.
All the switching possibilities are controlled through ORDER CODE : TEA6415CD
the I2C bus.
PIN CONNECTIONS
INPUT 1 20 INPUT
DATA 2 19 GROUND
INPUT 3 18 OUTPUT
CLOCK 4 17 OUTPUT
INPUT 5 16 OUTPUT
INPUT 6 15 OUTPUT
PROG 7 14 OUTPUT
INPUT 8 13 OUTPUT
VCC 9 12 GROUND
6415C-01.EPS
INPUT 10 11 INPUT
TEA6415C
BLOCK DIAGRAM
P ERI P ERI TTX LUMA PIP MAC
TV1 TV2 CHROMA DEC.
POWER
GND
18 17 16 15 14 13 12
CVBS
1
(MAC/DEC)
CVBS
3
(P ERI P LUG1)
CVBS
5
(AM TUNER)
MAC S IGNAL
6
(AMTUNER)
CVBS
8
(P ERI P LUG2)
CVBS
10
(FM TUNER)
MAC S IGNAL
11
(FM TUNER)
SYNCHRO
20
(TTX/BTX)
T
E
A
BUS
6
DECODER
4
1
5
C
2 7 4 9 19 6415C-02.EPS
DATA P ROG CLOCK VCC GND
GENERAL DESCRIPTION
The main functionof the IC is to switch 8 video input input (with external resistor bridge). All the switch-
sources on 6 outputs. ing possibilities are changed through the BUS.
Each output can be switched on only one of each Driving 75 load needs an external transistor.
input. On each input an alignment of the lowest It is possible to have the same input connected to
level of the signal is made (bottom of synch. top for several outputs.
CVBS or black level for RGB signals). The starting configuration upon power on (power
Each nominal gain between any input and output supply : 0 to 10V) is undetermined.
is 6.5dB. For D2MAC or Chroma signal the align- In this case, 6 words of 16 bits are necessary to
ment is switched off by forcing, with an external determine one configuration. In other case, 1 word
resistor bridge, 5 VDC on the input. Each input can of 16 bits is necessary to determine one configura-
be used as a normal input or as a MAC or Chroma tion.
I2C-bus controlled single and multistandard
TDA9885; TDA9886
alignment-free IF-PLL demodulators
1 FEATURES