APPENDIX-B: Exploded View
Removing or Installing the Stand
3
5
15
16
18
20
22
27
Page 3
Attention:
please read the following points carefully.
Safety precautions
This service manual is only for service personnel to take reference with. Before
servicing
1. Instructions
Be sure to switch off the power supply before
inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production
process!):
a) Do not touch here and there by hand at will;
b) Be sure to use anti static electric iron;
c) It’s a must for the welder to wear anti static gloves.
Please refer to the detailed list before replacing components that have special safety requirements.
Do not change the specs and type at will.
replacing or welding any components or
2. Points for attention in servicing of LCD
2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to
Use the screen of the original model for replacement.
2.2 The operation voltage of LCD screen is
protecting yourself and the machine when testing the system in the course of normal operation or
right after the power is switched off. Please do not touch the circuit or the metal part of the module
high voltage. Be
sure to take proper measures in
That is in operation mode. Relevant operation is possible only one minute after the power is switched
off.
2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or damage
to the set.
2.4 Never operate the set or do any installation work in bad environment such as wet bathroom,
laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc.
Otherwise bad effect will result.
2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into the
module, be sure to cut the power off immediately and do not move anything on the module lest it should
cause fire or electric shock due to contact with the high voltage or short circuit.
2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at
once. Likewise, if the screen is not working after the power is on or in the course of operation, the
power must be cut off immediately and no more operation is allowed under the same condition.
2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the
power is off because in this case relatively high voltage still remains in the capacitor of the driving
circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.
2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting or
extrusion, collision lest mishap should result.
2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary to
pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and
ensure full grounding for all the parts that have to be grounded.
2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or
moving the set please take care not to touch or scratch them. Once they are damaged the screen
would be unable to work and no way to get it repaired.
If the connection wires, connections or components fixed by the thermo tropic glue need to disengage
when service, please soak the thermo tropic glue into the alcohol and then pull them out in case of
damage.
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2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to
breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case
before the transportation or handling.
2.12 For the storage make sure to put it in a place where the environment can be controlled so as to
prevent the temperature and humidity from exceeding the limits as specified in the manual. For
prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one
place. The ambient conditions are tabulated as follows:
Temperature
Scope for operation
5
~+ 35
oC
Humidity
2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the
screen, as commonly called “ghost shadow”. The extent of the residual picture varies with the maker
of LCD screen. This phenomenon doesn’t represent failure. This “ghost shadow” may remain
in the picture for a period of time (several minutes). But when operating it please avoid displaying still
picture in high brightness for a long time.
Scope for storage
Scope for operation
Scope for storage
0 ~
+ 40oC
0% ~
90
0% ~ 90%
%
3. Points for attention during installation
3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.
3.2 For service or installation it’s necessary to use specified screw lest it should damage the screen.
3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between the
screen and the glass will affect the receiving and viewing effect
3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and
insulation please take care to keep it in intactness so as to avoid hidden trouble.
3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.
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2. Alignment instructions
2.1. Test equipment
VG-848 (Video, YPbPr and VGA signal generator)
VG-849 (
Video, YPbPr, VGA and
HDMI signal generator)
FLUKE 54200(TV signal generator)
CA210
(white balancer)
2.2. Power test
Connect main board, power board and IR board according the wiring diagram, connect
the power and press power key(Remote controller or Keypad) button to turn on the TV.
a) Test the pin voltage of P802/power board , the data is shown in table1:
Table1
voltage data of P802
P802 Pin1,2
Voltage
GND 22.8-25.2V
Pin3,4 Pin5,6,7
GND 11.4-12.6V 4.75-5.25V
For42”
Pin8,9 Pin10,11,12
On:2V-5.5V
Off: 0-0.5V
b) Test the pin voltage of P803/power board, the data is shown in table2:
Table2 voltage data of P803
P803 Pin1,2,3,4,5 Pin6,7,8,9,10
Voltage
22.8-25.2V GND NC 2V-5V 2.5-5V PWM NC
For42”
Pin11 Pin12 Pin13 Pin14
Pin13 Pin14 Pin15 Pin16
<0.6V
2.5-5V
PWM
2-5V
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2.3. Alignment flow-chart
The alignment flow-chart is shown as fig-1
Connect to the center signal source and check each
Function of TV (station leaking, analog control, etc.)
Check the output of earphone and speaker.
Check if DDC, HDCP KEY, FLASH are written
Combined test for general assembly
White balance adjustment
Input AV/SVIDEO signal and check the function
Input HD signal and check the function of YPbPr
Input VGA signal and check if the display is normal, check
the function (analog control), horizontal/vertical center, etc.
Input HDMI signal and check if the display is normal, check
the function (analog control), horizontal/vertical center, etc.
Preset ex-factory
Check the accessories and packing
Fig-1 adjustment flow-chart
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2.4. Adjustment instruction
At any input source then press the remote controller buttons “<”, “EXIT” and “>” to enter factory mode.
During Factory menu, if “MENU” or “EXIT” key is pushed, system will exit factory mode.
2.4-1. Source Calibration
4-1.1. Set the TV input source to YPbPr; ASTRO-859 signal setting to PG2 program number 933(1080i).
(PG2 mode Timing 933 and Pattern 924 100% Color Bar.)
4-1.2. Entering into factory Mode: Press up or down key of remote control to select “Auto Calibration”, Press
「OK」 key to start.
-> Source calibration performed automatically when finished that will show OK.
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4-1.3. Change input source to PC.
Change Astro-859 Timing to No.953 (640x480@60Hz) and pattern on 953(8step V-grayscale).
Repeat step 4-1.2 to do source calibration,
2.4-2. Color Temperature Adjustment & Check
4-2.1. Set input source.
Set the signal generator Astro-859 timing to PG2-924 on Video & YPbPr, PG2-860 on HDMI, and PG2-963
on PC. Pattern sets 956 on all of the source.
Then press Astro-859 “FORMAT” key and key, then adjust RGB value to R:204, G:204, B:204
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4-2.2. In factory mode OSD menu, select “Color Temperature” item, press “OK” key to enter the item.
R, G, B drive values are set for Warm, Medium, and Cool independently.
4-2.3. Set Color Temperature for “Warm”, “Medium” and “Cool” with following spec table.
Color temperature(for 42")
Color Temp. Cool Medium Warm
x 0.267
y 0.271
Tolerance ± 0.01
0.281
0.288
± 0.01
If the x and y value are larger than specification,
Decrease Red drive from default value.
Increase Blue drive from default value.
If the x or y or both x and y value is/are smaller than specification.
Decrease Blue drive from default value
According to a x and y value, please following adjustment of 1 or 2.
1 If x value is higher than spec
Decrease Red drive from default value.
2 If y value is higher than spec,
Increase Blue drive from default value
4-2.4 Exit Factory Mode:
After finishing adjusting color temperature, press [MENU] or [EXIT] to exit factory mode.
0.301
0.310
± 0.01
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2.5. Items of Factory menu
Vendor may customize design and add adjustment items Factory menu as far as all required items are
included.
Press up and down key can move high light item from Color Temperature Warn -> Color Temperature
Medium -> Color Temperature Cool ->Preset Channel-> Source Calibration -> Reset to Default.
The NVRAM Clear and Reset to Default items will have a check dialog “YES” and “NO” to do or not.
Push “Enter” key can select high light item function. (Press left and right can adjust value)
Display model name, firmware version and released date on top.
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5-1) Color Temperature for Warm
Press up or down key can select high light item function.
Press enter key to enter the item.
Following data for color temp shall be edited manually.
-R, G, B data for each preset.
-Press “Up” or “Down” key to select “R”, “G”, “B” item
-Press “Left” or “Right” key to set the “R”, “G”, “B” value.
-Press “MENU” or “EXIT” item to exit to factory mode
5-2) Color Temperature for Medium
Press up or down key can select high light item function.
Press enter key to enter the item.
Following data for color temp shall be edited manually.
-R, G, B data for each preset.
-Press “Up” or “Down” key to select “R”, “G”, “B” item
-Press “Left” or “Right” key to set the “R”, “G”, “B” value.
-Press “MENU” or “EXIT” item to exit to factory mode
5-3) Color Temperature for Cool
Press up or down key can select high light item function.
Press enter key to enter the item.
Following data for color temp shall be edited manually.
-R, G, B data for each preset.
-Press “Up” or “Down” key to select “R”, “G”, “B” item
-Press “Left” or “Right” key to set the “R”, “G”, “B” value.
-Press “MENU” or “EXIT” item to exit to factory mode
5-4) Time Clear
Press up or down key can select high light item function.
Press “Left” & “Right” key to select the item.
The timer on bottom is to record power on time for panel life.
It was set one time on production only.
5-5) Preset Channel
This is for factory to do some tests.
5-6) NVRAM Clear
Initialize program’s default values to NVRAM for following adjustment items accuracy.
In factory mode it is the first and important step to make sure all values are default value and correct.
- Reset settings: Channel table, Mode table (H/V Position, Clock, Phase), Source dependent setting
(Contrast, Brightness etc.), Common setting (Volume, Language etc.), Parental Control (Rating,
Password etc), Closed Caption.
To avoid a mistake initial process after factory setting is done. This item will have a check dialog to do the
initial or not.
NOTICE:
After this item is processed, the DUT needs to be powered off then AC powered off.
5-7) Full Power
This is for power consumption testing.
To measure the maximum power consumption of TV set, we adjust the value of following items to maximum.
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- Video: Contrast maximum value, Brightness maximum value, Backlight maximum value.
- Audio: Volume maximum value.
Press right key to turn on Full Power and OSD stay display until press enter key to recover from Full Power.
5-8) Source Calibration
Auto Calibration (gain/offset) must be adjusted color by firmware automatic adjustment in PC, and
Video3(Component) input source.
This item will have a result dialog “OK” or “NG”.
5-9) Reset to Default
This function is same as “NVRAM Clear”, but it will power off automatically after processing this function.
5-10) RF Burn In
Use “snow” pattern for burn in. Selected items are “On” and “Off”.
While turn on burn in mode, firmware will automatically turn off “Auto power off” function.
If there is no power supply suddenly, firmware will re-enter burn in mode automatically
when power supply is back.
Pressed the “Power” key, firmware will automatically turn off burn in mode.
- Burn in mode: Source is “TV”, Input Configuration is “Antenna” and channel is NTSC channel 2.
5-11) USB F/W Upgrade
The function is using USB device to upgrade firmware via USB port.
Copy the firmware file to USB device root path.
Execute this function to update firmware, the following OSD will display.
Note: After finishing updated, the system will reboot automatically
5-12) Protocol Switch
This is for debugging only. It is no use for service.
5-13) EDID Write
This is for writing EDID on the VGA source.
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5-14) MEMC Demo Mode
To separate screen into two parts that left side is 60Hz and right side is 120Hz for display.
5-15) MEMC Level
Changing MEMC level to Weak, Medium or Strong.
2.6. Performance check
No
Signal
name
Table4
Signal mode
Resolution
YPbPr
frequency(Hz)
signal format
Vertical
Horizontal
frequency
(KHz) (MHz)
Dot clock
frequency
Remarks
6-1 TV function
Connect RF to the center signal source, enter Channel menu → Channel Scan, check if there are channels be
skipped, check if the picture and speaker are normal.
6-2 AV/S-Video terminals
Input AV/S-Video signal, check if the picture and sound are normal.
6-3 YPbPr/YCbCr terminal
Input YPbPr signal (VG-859 signal generator), separately input the YUV signals listed in table4 and check if
the display and sound are normal at any situation (power on, channel switch and format convert, etc.)
1
2
3 720P/60
4 1080i/60 1920x1080 60 33.75 74.25
480i 720x480 59.94 15.73 27
480P 720x480 59.94 31.47 27
1280x720 60 45 74.25
6-4
PC(
VGA) terminal
Input
PC(V
GA) signal (VG-859 signal generator), separately input the signals listed in table5 and check the
display and sound. If the image is deflection of the Horizontal and Vertical, select Menu->PC->Auto Adjust to
perform auto-correct.
Signal mode
No
Signal
name
1
VGA 640 x 480
2 SVGA 800 x 600
3
XGA 1024 x 768
Resolution
Table5
PC
signal format
Horizontal
frequency
Vertical
frequency(Hz)
59.941 31.469 25.175
60.317 37.879 40
60.004 48.363 65
(KHz) (MHz)
Dot clock
frequency
Remarks
4
W-XGA
5
6 SXGA 1280 x 1024
1280 x 768
1360 x 768
59.87 47.776 79.5
60.015 47.712 85.5
60.02 63.981 108
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6-5 HDMI terminal
Input HDMI signal (VG-859 signal generator), separately input the signals listed in table6 and check the display
and sound (32KHz, 44.1KHz, 48KHz) at any situation (power on, channel switch and format convert, etc.)
Table6
HDMI
signal format
No
1
2
3
Signal mode
Signal
name
VGA 640 x 480 59.94 31.469 25.175
SVGA 800 x 600 60.317 37.879 40
XGA 1024 x 768 60.004 48.363 65
Resolution Vertical frequency(Hz) (KHz) (MHz)
Horizontal
frequency
Dot clock
frequency
Remarks
4
W-XGA
5
6
SXGA 1280 x 1024
7
8
9 720P/60
10 1080i/60 1920x1080 60 33.75 74.25
11 1080p/60 1920x1080 60 67.5 148.5
12 1080p/24 1920x1080 24 27 74.25
480i 720x480 59.94 15.734 27
480P 720x480 59.94 31.5 27.03
1280 x 768 59.87 47.776 79.5
1360 x 768 60.015 47.712 85.5
60.02 63.981 108
1280x720 60 45 74.25
6-6 other functions check
a) Check the turn on/turn off timer, sleep timer, picture/sound mode, OSD, stereo and analog TV Close Caption, V-
Chip, etc.
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3. Working principle analysis of the unit
1. NTSC/ATSC signal flow:
Antenna reception NTSC/ATSC signal will be send to tuner U32,
demodulating and output
These
differential IF+ IF- signal
interlace and scaler, then output LVDS level drive for panel display.
The
differential signals
amplifying, bass adjusting and volume control, the sound signal will
I2 S s i g na l b y
scaler
2. AV/S-VIDEO signal flow
S-VIDEO & Video path AV signal switch
differential IF+ IF- signal .
will send to the master control IC U1 to video/MPEGII decode, de-
will be fed into U1 to demodulate audio signals , after demodulating, pre-
I C
and sent to digital amplifier U5 amplifying,
by menu “Inpput list”
t h e n T u n e r w il l b e
b e t r a ns f or m i nt o d ig i t a l
then output to speaker.
via terminal socket, the signal and
the Video2 path AV signal will be fed to U1 to perform video decode, de-interlace and scaler, then
output LVDS drive level for panel display.
Audio signal from AV
the sound signal will be
amplifying,
output to speaker.
3. PC/YPrPb signal flow
terminal
via matched resistance is fed to U1 to bass adjust and volume control,
transfered into digital I2S signal by scaler IC
and sent to digital amplifier U5
PC and the Video2 path YPbPr signal are via terminal sent to U1 A/D conversion, output R/G/B of
24 bit to back end module to digital decode, image scale, then send to LVDS level drive for panel
display.
Sound signal of PC/YPrPb
te r m i n a l
via matched resistance
an d
sent to U1 to bass adjust and
volume control, the sound signal will be transform into digital I2S signal by scaler IC and sent to digital
amplifier U5 amplifying,
4. HDMI signal flow
HDMI video signal via terminal sent to
level for panel display. HDMI audio signal via decoder built-in terminal sent to
to bass adjust and volume control, the sound signal will
scaler IC and sent to digital amplifier
then output to speaker.
U1
U5
amplifying,
to digital decode, image scale, then output LVDS drive
U1 is
be
transform into digital I2S signal by
fed to back end
then output to speaker.
5. MEDIA signal flow
The JPEG file via USB terminal send to U1 to MPEG decode , image scale , then output LVDS
drive level for panel display .
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4. Block diagram-SANYO 42” ATSC model System Diagram
IR / LED Board
Light Sensor
42" MEMC
Main Board
HDMI 2
HDMI 1
Flash
MXIC
MX25L3205DM2I
PC
PC audio
DDRII 512M
Samsung
K4T51163QG-HCF7
DTV system IC
RENESAS
DTV-C7
R8J66977BG
S_Video
Composite
Y
Component
PrPb
Panel out
LVDS out
Audio I2S output
Digital audio out
(Coaxial)
Audio
AMP
ST
STA335W
DRV602PW
audio Line Out
IF +/-
R_out
L-out
DTVA50CVH1019B
ANT / CABLE
Tuner
Samsung
Side
HDMI
USB
Keypad
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Block diagram-POWER-42”
17
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5.IC block diagram
5-1. Renesas R8J66975-RFJZ , R8J66977BG-RFJZ
Model - SubModel Surround Maximum panel size Number of HDMI ports
R8J66975BG-RFJZ Simple surround WSXGA+
(1680 x 1050)
R8J66977BG-RFJZ Simple surround FullHD
(1920 x 1080)
Features
Main CPU
32bit RISC Super-H architecture SH3 CPU core
Demodulator
ATSC A/53 compliant 8VSB receiver /w QAM.
IF AGC control interface x1ch
System decoder (Stream demultiplexer)
Video and audio ES stream filtering x1
Section filtering: max. 32 PIDs
MPEG video decoder
Single ISO-13818-2 MP@ML or MP@HL support
Supports decoding of all ATSC-compliant formats
JPEG decoder
Decode Base-line JPEG file
2D Graphics
CEA-608/CEA-708-B closed caption support
Display processor, Video input/output
Full 10bit processing
MPEG Noise Filter (De-blocking/De-ringing)
Over Drive (Panel resolution : up to WXGA)
Inputs : CVBS x3, Y/C x2, YPbPr x2, RGB x1, HDMI x3
Outputs : 10-bit dual LVDS
3 24V 3 LED Red 3 VDD 23 Panel SEL 3 SPK_OUTL- 3 24V
4 24V 4 GND 4 VDD 24 GND 4 SPK_OUTL+ 4 24V
5 GND 5 IR SENS 5 LV0OUT4M 25 LV1OUT4M 5 GND
6 GND 6 3.3V 6 LV0OUT4P 26 LV1OUT4P 6 GND
7 GND 7 Light Sensor 7 LV0OUT3M 27 LV1CKOM 7 GND
8 12V 8 5V 8 LV0OUT3P 28 LV1CKOP
9 12V 9 LV0OUT2M 29 LV1OUT3M
10 5V 10 LV0OUT2P 30 LV1OUT3P
11 5V 11 GND 31 LV1OUT2M
12 5V 12 GND 32 LV1OUT2P
13 Power ON 13 LV0CKOM 33 LV1OUT1M
14 AC OFF Detect 14 LV0CKOP 34 LV1OUT1P
15 BACKLIGHT_ADJ 15 GND 35 LV1OUT0M 15 BL_ADJ
CN16 8 12V
MEMC SEL 0 9 12V
SIDA1 10 5V
MEMC SEL 1 11 5V
SICL1 12 5V
FR Select 13 Power ON 13 BL_ADJ
GND 14 ACD
P803
24V
24V
24V
24V
24V
GND
GND
GND
GND
GND
NC
BL_EN
NC
16 BACKLIGHT_EN 16 GND 36 LV1OUT0P 16 BL_EN
17 LV0OUT1M 37 GND
18 LV0OUT1P 38 DCR EN
19 LV0OUT0M 39 BACKLIGHT_ADJ
20 LV0OUT0P 40 DCR ADJ
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7. Trouble Shooting
7-1. Fault clearance
22
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7-2. Troubleshooting guide
The flow chart shown below will help you to troubleshoot your Televison set with it doesn’t display
normally. Each procedure offers a simple way to check for system errors. Before starting, ensure
that there is a signal in and that the Televison is turned on.
7.2-1 Power LED no light
Change to new power board.
P/N : PK101V2010I (SSB42T)
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7.2-2 Has audio but no video out
Change to new power board.
P/N : PK101V2010I
(
SSB42T)
24
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7.2-3 Has video but no audio out
Have a video but no
sound
Check volume or
Mute
OK
Check Input
source
OK
Check speakerChange speaker
OK
MUTE
NG
NG
Cancel mute function
Or adjust volume up
Change source device
Change main pcb
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Change to new power board.
P/N : PK101V2010I (SSB42T)
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8.SCHEMATIC DIAGRAM
ELECTRON-42"
Page 28
5
Sheet Index
Page 03 - System Power
4
3
2
MAIN PCB1
MAIN PCB1
1
FW1
FW1
FIRMWARE
FIRMWARE
FW STC40T REV1.0
FW STC40T REV1.0
Page 04 - C7 & MCU / Key
DD
Page 05 - C7 & Tuner Input
EMIcover1
EMIcover1
Page 06 - C7 & Video Input
Page 07 - C7 & VGA Input
Page 08 - C7 & HDMI Input
Page 09- C7 & Audio Input
Page 10 - C7 & Debug IO / FLASH ROM
EMIcover-C7
EMIcover-C7
Page 11- C7 & Power
Page 12 - C7 & DDRII-800
Page 13 - C7 & LVDS Output
Page 14 - C7 & Audio Out
CC
Page 15 - Audio Amplifier
VTV-L40601 REV:0A
VTV-L40601 REV:0A
Notice
1. All Res. is 0603.
2. All Cap. is 0402 (<=0.47uF), 0603 (<=1uF), 0805 (<=10uF).