Sansui SJC24FH-ZMA User manual

Service Manual
Model Name: LEDTVSJC24FH-ZMA

1.Preface
1.1 Applicable area
This test manual is applicable for KDLXXMSXXQ(A) LCD TV.
1.2 Test notes
1.2.1 Please follow the pointed test steps and choose the proper test equipment to conduct
adjustment, otherwise good effect of TV set could not be obtained. Pointed bias voltage value
should be ensured during test to get satisfied test result.
1.2.2 Be sure that you have the static electricity –protective glove in before test.
2 Test environment
1）Temperature：15 ~ 35°C
2）Relative humidity 45 ~ 75%
3）Air pressure: 86 ~ 106kPa
3 Test equipment
Test equipment below must be calibrated
1) Computer(With serial, parallel) 1 set
2) Multi-meter (VICTOR VC9801) 1 set
3)Video Signal Generator(ChromaModel2227/2327/VG859) 1 set
4) Color Analyzer (Chroma Model 7120 ) 1 set
5) TV Video Signal Generator (FLUKE PM54200) 1 set
6) USB Mass Storage Device（Only be used in sets with USB function）1 set
7) Remote controller with factory keys 1 set
8)AV，VGA，YPbPr/YCbCr，HDMI Signal line etc 1 set
9) Burner such as all-11 or BeeProg 1 set
4.Test item and method
Test items
Equipments
Requirements
Procedure and SPEC
1. M/B
Voltage confirmation
Digital Multimeter
Please refer to appendix
4.1/4.2/4.3 if there is
abnormal phenomenon.
2. Software writing
and Upgrade
PC
Debug Tool
Please refer to appendix
4.5/4.6 or follow the RD
engineer guidance.
3. HDMI EDID
writing
No need.
4. HDCP KEY writing
PC
Debug Tool
Please refer to appendix
4.6.
5. Enter and exit the
factory menu
Remote control
Method: press “MENU”
button on the remote
control and then press
“2”, “0”, “0”, “8”in 3
seconds, and enter the
factory menu in success.
Press EXIT button to
exit the factory menu.
6.Initialization
parameters
（Transferred to
default values）
Enter the factory menu,
and select “Reset”and
click "OK" button, the
confirmation pop-up
menu, select "Yes",

television began to reset
and automatic re-
starting.
7. Auto color
video signal generator
(VG859),Computer
YPbPr:
Enter 75% color bar
signal (SD: 576i or
480i formats; HD:
1080i format);
VGA:
White-black
checkerboard grid
signal
Enter the factory meun
as above, in the factory
area menu, select "ADC
ADJUST"
and press "OK" button
to enter. VGA access
under the MODE select
RGB; YPbPr channel
SD signal MODE select
YPbPr (SD), HD signals
select YPbPr (HD). And
then select "AUTO
ADC" click "OK"
button to begin
adjusting. Successful
show "SUCCESS",
failed show "FAIL", to
be re-adjusted. (YPbPr
channels generally do
not have to adjust, use
the default value can be;
VGA channels such as
making adjustments,
please note that the
adjusted R, G, B values
should not be that much
difference)
8. Color temperature
adjustment and white-
balance calibration
This adjustment is
getting better, can not
do Auto Color action.
a. AV:
1. Color temperature
adjustment
2. Brightness and
black-balance
calibration
TV Signal Generator,
Color Signal Analyzer
Input gray step signal
(100%)
1. Enter factory menu,
select “COLOR
TEMP”, and select
“COLOR TEMP
NORMAL”.
2. Test the second gray
step signal and
adjust R/G/B OFF
to get black
calibration;
Test the eighth gray
step signal and
adjust R/G/B GAIN
to get white
calibration.
b. YPbPr:
1. Color temperature
adjustment
2. Brightness and
black-balance
High-definition video
Signal Generator,
Color Signal Analyzer
Input gray step
signal (100%)
1. Enter factory
menu, select “COLOR
TEMP”, and select
“COLOR TEMP

calibration
NORMAL”.
2. Test the second gray
step signal and
adjust R/G/B OFF
to get black
calibration;
Test the eighth gray
step signal and
adjust R/G/B GAIN
to get white
calibration.
c. VGA:
1. Color temperature
adjustment
2. Brightness and
black-balance
calibration
High-definition video
Signal Generator,
Color Signal Analyzer
Input gray step signal
1. Enter factory menu,
select “COLOR
TEMP”, and select
“COLOR TEMP
NORMAL”.
2. Adjust R/G/B OFF
to set black color
temperature to 9300.
Adjust R/G/B GAIN
to set whiter
temperature to 9300.
9. TV mode check
Factory TV Signal or
TV Signal Generator
Output PAL Signal
1. Enter User menu,
Check
whether the pictures
normal or not, and
snowflake points
come forth in no signal
background. It would
enter
standby state in 5
minutes if no signal
inputs.
2. Check Auto Search /
Manual Search etc
right or not.
10. AV check
DVD Video cable
Play DVD
Set DVD to interlace/
progress output
Screen is clear and
fluent. Audio checks if
the output is normal.
11. YCbCr(480I/576I)
DVD Component
Cable
720p/1080i DVD
Player
Play DVD
Set DVD to interlace
output (Y/Cb/Cr)
Screen is clear and
fluent. Audio checks if
the output is normal.
12. YPbPr
SDTV: 576P/480P
HDTV:
720p/1080i/1080p
DVD Component
Cable
720p/1080i DVD
Player
Play SDTV/HDTV
(Y/Pb/Pr)
Screen is clear and
fluent. Audio checks if
the output is normal.
13. VGA INPUT
PC
VGA Cable
TV BOX
PC Mode
1. Each Mode Screen is
clear and fluent.
Audio checks if the
output is normal.

D-SUB cable
2. Confirm PC can
automatically
identify TV model.
3. Play TV BOX Screen
is clear and fluent,
Audio checks if the
output is normal.
14. HDMI check
SAMSUNG
DVD-HD948
BuBuGao DVD （or
DVD with HDMI）
HDMI Cable
HDMI Mode
1. Choose HDMI
mode in the
SOURCE menu.
2. Each Mode Screen
is clear and fluent.
Audio checks if the
output is normal.
15. HDCP check
BuBuGao DVD （or
DVD with HDMI）
VGA859 or authorized
equipment which is the
same level
HDMI Mode
1. Choose HDMI mode
in the SOURCE
menu.
2. Check the test signal
with HDMI/HDCP,
that is output by
signal generator. See
whether it will show
“PASS”or not.
16. Earphone Output
function check
Earphone、DVD
TV or play DVD IN
1. Plug in the
earphone, the main
speaker silent, the
sound of headphone
normal. Press
VOL+-, Audio
checks if the output
is normal.
2. Unplug the
earphone, the main
speaker sound
normal.
17.USB check
（Only be used in sets
with USB function）
USB Mass Storage
Device
Images, audio, video,
text files
1. Select SOURCE to
the USB;
2. insert U disk, should
be able to quickly
identify the
corresponding letter
on the screen;
3. Select the file
playing, should be
able to play
correctly
18. Remote control
function check
PC 、DVD Pattern
Generator
TV Signal Generator
HDTV Player
Use remote control to
check whether each
mode function is normal
or not.
4.1 Accessories

4.1.1 Power Supply/M/B Voltage confirmation
4.1.2 The input and output characteristic test of power
4.1.3 Testing intention: Check input and output to find whether or not short circuit
4.2 checking method:
Use a multimeter set as resistance stalls, measure AC input of the power module, and check
voltage inputs on the main board to find whether or not short circuit to ground.
No.
Items
Test Points
Standard
1
The resistance of AC input of the power
module
AC input connector XS901
no short circuit
2
The resistance of 12V output on the main
board
R1
no short circuit
3
The resistance of 5Vstb output on the main
board
C912
no short circuit
4
The resistance of 5VA output on the main
board
C390
no short circuit
5
The resistance of 3.3Vstb output on the main
board
C47
no short circuit
6
The resistance of 1.8V_DDR2 output of the
main board
U27 Pin2
no short circuit
7
The resistance of 1.26V output of the main
board
C395
no short circuit
8
The resistance of Tuner5V output of the
mainboard
U28 Pin2
No short
circuit
9
The resistance of VCC-Panel output of the
mainboard
C58
no short circuit
10
The resistance of 3V3_Normal output of the
main board
U23 Pin2
no short circuit
4.3 Signal Board part
4.3.1 Signal board power part
Signal Board power distribution
3.3VSTB
U23(3.3V)
Q37(5V) +3.3V_Normal
U27(2.5V)
U6(1.32V)
+2.5V_Normal
+1.2V_VDDC
+5V_USB2
U908(12V)
+12V
U901(5V)
U32(12V)
U28(5V) TUNER
Q3 PANEL VCC
U20(3.3V)

4.3.2 Verify the state of TV set
Set “ON/OFF”on the right side of the TV set to “ON”and verify the LED indicator’s color. If the
LED color is red, TV is in standby state. If the LED color is green, TV is in working state.
4.3.3 Checking supply power
If the LED color is green, power supply is ON, test the major power voltage: 5Vstb, test C912; 12V,
test R1; 1.26V, test C395; 2.5V_DDR, test U27 Pin2, refer to the power test table above.
4.3.4 Electrify TV in several minutes, if it shows black screen (backlight is not turned on), please
press the standby button.
4.3.5 If TV still shows black screen, check whether power supplies and backlight line connection is
normal or not.
4.4 White Balance adjustment
4.4.1 Turn on the Color Signal Analyzer, then set detector to 0Cal model. After adjusting, set detector
to Measure model. Press “Mode”button, set Color Signal Analyzer to Lv U V mode. The Lv shows
brightness.
4.4.2 Enter the picture menu, set picture to normal mode, set backlight to 90.
4.4.3 Enter the factory menu,
Adjust R OFFSET 0-255 default: 128
G OFFSET 0-255 default:128
B OFF SET 0-255 default: 128
R GAIN 0-255 default: 128
G GAIN 0-255 default: 128
B GAIN 0-255 default: 128
4.4.4 Find the brightest point
Input white signal, keep R gain, B gain，R off ,B off , G off, adjust G gain to find the brightest point.
Procedure:
Input 100% white signal, increase G gain until the bright don’t change. This is the brightest point. For
the default may be the brightest value, the bright don’t change even increase default. In this case, first
decrease G gain until the bright get down, then increase it.
4.4.5 Then set R gain, G gain, B gain, R off, G off, B off to the default, adjust R gain and B gain as
same as the G gain shown above. Generally, the maximal value of R gain or B gain equals to G gain.
So this step can be simplified.
4.4.6 Find the blackest point
Procedure:
Input black signal(0% white signal),keep the values that get in the fifth step. Then decrease G off until
the bright don’t change. This is the blackest point. If the bright don’t change when decrease G off
from 128, the value of the blackest point is 128.
4.47 Adjust black calibration
Procedure:
Record the values of R gain, G gain, B gain in the forth and fifth step, input 25% white signal, adjust
R offset, G offset, B offset equally. Generally, increase values to the bright area.
4.4.8 Find the brightest point again
Procedure:
Input 100% whit signal, refer to the forth and fifth step. Get the new values of R gain, G gain and B
gain.
4.4.9 According demand, decrease the values of R gain, G gain, B gain synchronously from 5 to 10.
Procedure:
Input 75% white signal, adjust R gain, G gain, B gain until the color temperature meets demand.

Note: the values of R gain, G gain, B gain can’t be more than the brightest values that get in the eighth
step.
4.4.10 Adjust black-balance calibration
Procedure:
Input 20% or 25% white signal, adjust R off, G off, B off until the color temperature meets demand.
Note: the values of R off, G off, B off can’t be less than the blackest values that get in the sixth step.
4.4.11 Adjust brightness and black-balance calibration again and again until them meet demand. Then
according picture character and demand, do fine tune. Input 100% gray step signal, measure parameter
and do fine tune again. Then measure values again, the parameter of every gray should meet demand.
4.5.1 Upgrade software instruction
1）Upgrade Tool connection method
2）USB connect to upgrade board and computer,4PIN CABLE connect to upgrade tool board and
mainboard.

3）Run the ISP_TOOL, and then click “Config”，burning tools are set as shown:
4) Pitch on the “Connect”，check if the connection is available. If shown the following dialog box, it
means hardware connection is successful. Otherwise, it means hardware connection failure.

5）Click “Read”, and then choose the XXX.bin file.
6）Pitch on the “Auto” menu，setup the tool as following picture. Then click the “Run”，serial
minutes it will show PASS, that means update is successful，if show “Error” means the update
failure. Please pitch on the “Run” button once again, do not need to cut off.