This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
Page 2
Service Manual
Model No.:
Chapter 1: General Information
1-1. Table of Contents
1. General Information...........................................................................
1-1. Table of Contents
1-2. General Guidelines
1-3. Important Notice
1-4. How to Read this Service Manual
When servicing, observe the original lead dress. If a short circuit is found, replace all parts
which have been overheated or damaged by the short circuit.
After servicing, see to it that all the protective devices such as insulation barriers, insulation
papers shields are properly installed.
After servicing, make the following leakage current checks to prevent the customer from
being exposed to shock hazards.
1) Leakage Current Cold Check
2) Leakage Current Hot Check
3) Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive
1-3. Important Notice
1-3-1. Follow the regulations and warnings
Most important thing is to list up the potential hazard or risk for the service personnel to
open the units and disassemble the units. For example, we need to describe properly
how to avoid the possibility to get electrical shock from the live power supply or charged
electrical parts (even the power is off).
This symbol indicates that high voltage is present inside.It is dangerous to
make any king of contact with any inside part of this product.
This symbol indicates that there are important operating and maintenance
instructions in the literture accompanying the appliance.
1-3-2. Be careful to the electrical shock
7R SUHYHQW
to rain or excessive moisture. This TV must not be exposed to dripping or splashing water,
DQG REMHFWV ¿OOHG ZLWK OLTXLG VXFK DV YDVHV PXVW QRW EH SODFHG RQ WRS RI RU DERYH WKH 79
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
components commonly are called Electrostatically Sensitive (ES) Devices. The following
techniques should be used to help reduce the incidence of component damage caused by
electros static discharge (ESD).
1-3-4. About lead free solder (PbF)
This product is manufactured using lead-free solder as a part of a movement within the
consumer products industry at large to be environmentally responsible. Lead-free solder
must be used in the servicing and repairing of this product.
8VH WKH JHQHZLQJ SDUWV VSHFL¿HG SDUWV
Special parts which have purposes of fire retardant (resistors), high-quality sound
(capacitors), low noise (resistors), etc. are used.
When replacing any of components, be sure to use only manufacture's specified parts
shown in the parts list.
in the original positions, or whether there are the positions which are deteriorated around
the serviced places serviced or not. Check the insulation between the antenna terminal or
external metal and the AC cord plug blades. And be sure the safety of that.
Always unplug the receiver
a. Removing or reinstalling any component, circuit board module or any other receiver
assembly.
b. Disconnecting or reconnecting any receiver electrical plug or other electrical
connection.
c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic
capacitors may result in an explosion hazard.
2. Test high voltage only by measuring it with an appropriate high voltage meter or other
voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage
probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its assemblies.
AC power cord from the
AC power source before;
4. Unless specified otherwise in this service manual, clean electrical contacts only by
applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or
comparable non-abrasive applicator; 10% (by volume) Acetone and 90% (by volume)
isopropyl alcohol (90%-99% strength).
9. Remove the antenna terminal on TV and turn on the TV.
10. Insulation resistance between the cord plug terminals and the eternal exposure metal
should be more than Mohm by using the 500V insulation resistance meter.
11. If the insulation resistance is less than M ohm, the inspection repair should be required.
If you have not the 500V insulation resistance meter, use a Tester. External exposure
metal: Antenna terminal Headphone jack
- 04 -
Page 6
Service Manual
Model No.:
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily by static electricity.
Such components commonly are called Electrostatically Sensitive (ES) Devices.
Examples of typical ES devices are integrated circuits and some field-effect transistors
and semiconductor "chip" components. The following techniques should be used to help
reduce the ncidence of component damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or semiconductorequipped assembly, drain off any electrostatic charge on your body by touching a known
earth ground.
strap device, which should be removed to prevent potential shock reasons prior to applying
power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly
on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
Alternatively, obtain and wear a commercially available discharging wrist
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static type solder removal device. Some solder removal devices not
6. Do not remove a replacement ES device from its protective package until immediately
before you are ready to install it.
(Most replacement ES devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement
ES device, touch the protective material to the chassis or circuit assembly into which the
device will be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other
safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices.
(Otherwise harmless motion such as the brushing together of your clothes fabric or the
OLIWLQJ RI \RXU IRRW IURP D FDUSHWHG ÀRRU FDQ JHQHUDWH VWDWLF HOHFWULFLW\ VXI¿FLHQW WR GDPDJH
an ES device.)
1-3-7. Ordering Spare Parts
Please include the following informations when you order parts. (Particularly the Version
letter)
1. Model number, Serial number and Software Version
The model number and Serial number can be found on the back of each product and the
Software Version can be found at the Spare Parts List.
2. Spare Part No. and Description
<RX FDQ ¿QG WKHP LQ WKH 6SDUH 3DUWV /LVW
- 05 -
Page 7
1-3-8. Photo used in this manual
The illustration and photos used in this Manual may not base on the final design of
products, which may differ from your products in some way
1-4. How to Read this Service Manual
Using Icons:
,FRQV DUH XVHG
each icon is described in the table below:
Note:
A “note” provides information that is not indispensable, but may nevertheless be valuable
to the reader, such as tips and tricks.
WR DWWUDFW WKH DWWHQWLRQ RI WKH UHDGHU WR VSHFL¿F LQIRUPDWLRQ 7KH PHDQLQJ RI
Service Manual
Model No.:
.
Caution:
A “caution” is used when there is danger that the reader, through incorrect manipulation,
may damage equipment, loose data, get an unexpected result or has to restart(part of) a
procedure.
Warning:
A “warning” is used when there is danger of personal injury.
Reference:
A “reference” guides the reader to other places in this binder or in this manual, where he/
VKH ZLOO ¿QG DGGLWLRQDO LQIRUPDWLRQ RQ D VSHFL¿F WRSLF
- 06 -
Page 8
Service Manual
Model No.:
6SHFL¿FDWLRQV
- 07 -
Page 9
3. Location of Controls and Components
3-1 Board Location
Service Manual
Model No.:
A Board
B Board
3-2 Main Board
No.Description
A Board Mainboard
B
Board
Power Supply
- 08 -
Page 10
Service Manual
Model No.:
3-2-1 Function Description:
Main Board
Pr
ocess signal which incept from exterior equipment then translate into signal that panel
can display.
3-2-2 Connector denition
Main board connector
Power connectors ( J 20 )
Notes:
J 20-Pin 3: Backlight on/off:
he system can turn on or turn off the backlight of TFT LCD Panel through the power
T
supply unit path.
J 20-Pin 5: System power on / standby
System board will use this pin to control system power.
J 20-Pin 3: Control the luminance of backlight
The system can generate the PWN signal to control the strength of TFT LCD Panel’s
backlight through this connector
Keypad and remote connector ( 2)Keypad and remote connector ( 2)Keypad and remote connector (J 2)
Service Manual
Model No.:
WIFI J ACK J 25
- 10 -
Page 12
Service Manual
Model No.:
3-3. Power Board
3-3-1 Function Description:
Supply power for Main board, Panel.
3-3-2Connectordefinition
CON201
Pin numberSignal name
1
2
3
4
5
6
7 +5V
8
9
10
11
12
13
SGND
AD
ON/BK
+5V
ON/OFF
+5VSTB
+5V
GND
GND
GND
+12V
+12V
- 11 -
Page 13
3-4. LED Panel
Service Manual
Model No.:
LSC490FN02-W/
- 12 -
Page 14
Service Manual
Model No.:
3-4-1.Connector de finition
Page 15
Service Manual
Model No.:
4. Disassemble and assemble
4-1 Remove the Pedestal
4-2Remove the Back Cover
/D\ GRZQ WKH XQLW VR WKDW UHDU FRYHU
faces upward
5HPRYH WKH WKUHH VFUHZ IURP WKH
UHDU FRYHU LQGLFDWHG ZLWK ż
7KHQ UHPRYH WKH SHGHVWDO
4-3. Remove the adhesive tape
5HPRYH WKH
¿JXUH DERYH E\ ż
7KHQ UHPRYH WKH EDFN FRYHU IURP WKH
unit.
Remove the adhesive tape indicated on the
WKHVH VFUHZ LQGLFDWHG RQ
- 14 -
¿JXUH DERYH
Page 16
LE49U6500DUA
4-4 Remove the Main board
Service Manual
Model No.:
4-5 Remove the speaker
'LVFRQQHFWHG WKH
J2 J25 J20 P501
5HPRYH WKH 0DLQ ERDUG
FRXSOHU
Take out the speaker
- 15 -
Page 17
Service Manual
Model No.:
4-6 Remove the remote control
take out the Remote Control and Keypad Assembly
4-7 Remove the Power Supply
- 16 -
Page 18
5. Installation Instructions
5-1 External Equipment Connections
A
Service Manual
Model No.:
Battery
Remote Control
Antenna Connection
Connect one end of a coaxial cable (not included) to the ANT IN jack on the back of
your TV/DVD combo, then connect the other end of the cable into the antenna or cable
TV wall outlet.
Remote Control
To improve picture quality from an antenna in a poor signal area, install a signal
DPSOL¿HU
If you need to split the antenna signal to connect two TVs, install a two-way splitter.
- 17 -
Page 19
ANTENNA
PC
INSTALLATION
- 18 -
Page 20
* Subject to material object.
SUPPORTED MODE (PC)
1
RESOLUTION
640*480
V.Freq.(Hz)H.Freq.(KHz)
60
31.47
INSTALLATION
2
3
4
5
6
800*600
1024*768
1366*768
1280*1024
1920*1080
(Only for 40")
NOTE: PC V.Freq.(Hz) not more than 60Hz.
PRESET MODE (HDMI)
1
2
3
4
5
RESOLUTION
800*600
1024*768
1366*768
1280*768
1920*1080
60
60
60
60
60
V.Freq.(Hz)H.Freq.(KHz)
60
60
60
60
60
37.88
48.36
47.71
63.98
67.5
37.88
48.36
47.71
47.3
67.5
- 19 -
Page 21
AV EQUIPMENT
This TV provides one group of AV, one group of YPbPr for convenient connection to VCR, DVDor other
video equipment. Please refer to the owner's manual of the equipment to be connected as well.
You can use the input terminals on TV set rear as follows.
- 20 -
Page 22
Service Manual
Model No.:
5-2 HDMI Connections
When the source device(DVD player or Set Top Box) supports HDM
How T
1. Connect the source device to HDMI port of this TV with an HDMI cable(not supplied
with this product).
2. No separated audio connection is necessary.
How To Use
If the source device supports Auto HDMI function, the output resolution of the source
device will be automatically
set to 1280x720p.
If the source device does not support Auto HDMI, you need to set the output resolution
appropriately.
To get the best picture quality, adjust the output resolution of the source device to
1280x720p.
Select HDMI input source in input source option of Select Main source menu.
o Connect
When the source device(DVD player or Set Top Box) supports DVI
How To Connect
1. Connect the source device to HDMI port of this TV with a HDMI-to-DVI cable(not
supplied with this product).
2. A separated audio connection is necessary.
3. If the source device has an analog audio output connector, connect the source device
audio output to DVI Audio In port located on the PC port.
How To Use
If the source device supports Auto DVI function, the output resolution of the source device
will be automatically
set to 1280x720p.
If the source device does not support Auto DVI, you need to set the output resolution
appropriately.
To get the best picture quality, adjust the output resolution of the source device to
1280x720p.
Press the INPUT button to select HDMI input source in input source option of Select Main
source menu.
Installation
- 21 -
Page 23
Cable sample
Service Manual
Model No.:
HDMI Cable
(not supplied with the product)
HDMI to DVI Cable
( not supplied with the product)
Analog Audio Cable
(Stereo to RCA
(not supplied with the product)
type)
- 22 -
Page 24
Service Manual
Model No.:
Power source
TO USE AC POWER SOURCE
Use the AC polarized line cord provided for operation on AC.
Insert the
NOTES:
simply unplug the unit from the AC outlet and plug it back in. The unit should return to
normal operation.
AC cord plug into a standard polarized AC outlet.
- 23 -
Page 25
6. Operation Instructions
6-1 Front panel controls
Service Manual
Model No.:
Front panel
KEYBOARD
Rear/Side Sockets
- 24 -
Page 26
TELETEXT
Teletext is an information system broadcast by certain channels which can be consulted like
a newspaper. It also offers access to subtitles for viewers with hearing problems or who are
not familiar with the transmission language(cable networks, satellite channels, etc.)
Remote Control
Press:
TEXT
SELECTING A PAGE
DIRECT ACCESS
TO THE ITEMS
INDEX
SUB PAGE
HOLD
You will obtain :
This is used to call or exit teletext modes. The summary appears with a list
of items that can be accessed. Each item has a corresponding 3 digit page
number. If the channel selected does not broadcast teletext, the indication
100 will be displayed and the screen will remain blank (in this case, exit
teletext and select another channel).
Enter the number of the page required using the 0 to 9 up/down. Example:
page 120, enter 120. The number is displayed top left, the counter turns and
then the page is displayed. Repeat this operation to view another page. If
the counter continues to search, this means that the page is not
transmitted. Select another number.
Coloured are as are displayed at the bottom of the screen. The 4 coloured
keys are used to access the items or corresponding pages. The coloured
areas flash when the item or the page is not yet available.
This returns to the contents page (usually page 100).
Certain pages contain sub-pages which are automatically displayed
successively. This key is used to stop or resume sub-page acquisition.
The indication appears top left.
To freeze the page.
REVEAL
MIX
EXIT
SIZE
To display or hide the concealed information (games solutions).
Teletext,program,image are displayed together.
Exit the te le t ex t.
Swi tch t he ima ge to top, botto m,ful l.
EN-18
Page 27
5
DD
3
2
1
5V_Standby_0.85A5V_Normal_2.06A
5V_Standby5V_Normal12V_Normal
5V_Standby_0.85A
5V_Normal_2.06A
12V_Normal_3.5A
12V_Normal_3.5A
MOS
GV3401
V_Panel_1.5A12V_Normal_1.5A
ON/OFF
12V_Normal_2AAMP
CC
5V_Normal_0.5A
MOS
GV3401
Cl_0.5A
AD82587
DC
MSH6110
DC
RT7240
2*8W12V_Normal_1.5A
VDDC_CPU_1.05V_1.6A12V_NORMAL_0.16A
VDDC 0.96V 3.8A12V NORMAL 0.38A
ON/OFF
5V_Normal_0.3ATUNER_0.3A
BB
LDO
1117-3.3
FUSE5V_Normal_1A5V_USB_1A
1.5A
MSD6586
5V_Normal_0.26A
1117-3.3
3.3V_Normal_0.26ALDO
5V Standy 0.15A
DC
RT8097C
1117-3.3
1.5V_1.5A5V_Standy_0.5A
3.3V Standby 0.15ALDO
WIFI5V_Standby_0.2A
AA
Title
Title
Title
01. Power_Tree
01. Power_Tree
01. Power_Tree
SizeDocument NumberRev
SizeDocument NumberRev
SizeDocument NumberRev
<Doc><RevCode>
A3
<Doc><RevCode>
A3
<Doc><RevCode>
A3
DateSheetof
DateSheetof
5
3
2
DateSheetof
113Thursday, March 30, 2017
113Thursday, March 30, 2017
113Thursday, March 30, 2017
1
Page 28
5
+12V_Normal
J26
1
2
3
4
5
6
DD
7
8
9
10
1*10P*2.54mm/180
J27
1
2
3
4
5
6
1*6P*2.0mm/180
STANDBY
BL-ADJUST
BL-ON/OFF
+5V_Normal
Vcc_Panel
+5V_Standby
+12V_Normal
VDDC_CPU Power
+12V_Normal
R120
100K
C125
C124
靠近
DCDC
10uF/16V/X5R
R12310K
C126
0.1uF/16V/X5R
0.1uF/16V/X5R
C127
0.1uF/16V/X5R
4
U104
MSH6110A
Addr 0x80
8
PVDD
1
EN
3
5V
4
SDA
I2C-SDA 3,7,13
LX
BST
FB
SCL
PowerPAD
9
D101
L102
2.2uH/6A/不涂胶
NC/SS34
6
C118
7
0.1uF/16V/X5R
2
R2=50K
5
Vout=0.828V*(1+R1/50K)
有
DVFS
R1
I2C-SCL 3,7,13
功能,此
12
DCDC
R122
C119
NC
330pF
R12415K/1%
不能更改
R124:
538
和
Note
:能提供最大平均电流5A。
远端反馈,即 从
IC
3
6586
统一为
+1.05_VDDC_CPU
底部引线
C120
2
15K
22uF/6.3V/X5R
C121
+1.05_VDDC_CPU
C123
C122
靠近
DC-DC
22uF/6.3V/X5R
0.1uF/16V/X5R
NC/22uF/6.3V/X5R
1
Control
BL-ADJUST
BL-ON/OFF
CC
STANDBY
C117
R119
10K
R126100R
R1171K
R1181K
R121
10K
2.2uF/6.3V/X5R/NC
+5V_Standby
H :Power on
R125
L :Power off
4.7K
PWR-ON/OFF 3
BRI_ADJ 3
VBL_CTRL 3
VDDC Power
R6856 100K
C2245
C2247
C2248
R6944
NC
10uF/16V/X5R
10uF/16V/X5R
0.1uF/16V/X5R
C2178
U11
RT7240
VCC8SW
1
EN
3
VREG5
C29
C30
3900pF
1uF/10V/X5R
0.1uF/16V/X5R
BST
4
SS
5
FB
GND
9
GND
6
7
2
L17
12
C31
0.1uF/16V/X5R
C217910pF/NC
R1
RW225.6K/1%
RW2521K/1%
R2
2.2uH/6A/不涂胶
C2261220uF/10V/X5R/LowESR
470R/1%
R106
远端反馈,即 从
0.96V
C105
+1.10V_VDDC
C106
IC
+1.10V_VDDC+12V_Normal
C107
底部引线
C108
22uF/6.3V/X5R
22uF/6.3V/X5R
22uF/6.3V/X5R/NC
0.1uF/16V/X5R
靠近
DC-DC
Vout=0.765V*(1+R1/R2)=0.979V
Connector
1*13P*2.54mm/180/NC
+12V_Normal
13
12
11
10
9
8
7
6
5
STANDBY
4
3
BL-ON/OFF
2
BL-ADJUST
1
J20
+5V_Normal
+5V_Standby
H :Power on
L :Power off
+5V_Normal
LDO
2
U103
ADJ
+5V_Normal
0.1uF/16V/X5R
4
OUT
IN
321
+3.3V_Normal
C116
C115
C114
10uF/6.3V/X5R
0.1uF/16V/X5R
Title
Title
Title
02. System power
02. System power
02. System power
Size Document NumberRev
Size Document NumberRev
Size Document NumberRev
<Doc><RevCode>
Custom
<Doc><RevCode>
Custom
<Doc><RevCode>
Custom
Date:Sheetof
Date:Sheetof
Date:Sheetof
+5V_Normal
4
U1111117-1.8V
ADJ
OUT
IN
321
+1.8V_Normal
C2260
C162
C163
10uF/6.3V/X5R
0.1uF/16V/X5R
40mA
1
0.1uF/16V/X5R
213Thursday, March 30, 2017
213Thursday, March 30, 2017
213Thursday, March 30, 2017
L103
2.2uH/2.2A
R6953 10K
C131 22pF/NC
R12915K/1%
R130 5.1K/1%
R2
R69434.7K/1%
12
SW3VIN
POK
FB
GND
JW5212SOTB
5
R1
6
Vout=0.6V*(1+R1/R2)=1.518V
H3
1
2
金属支架
4
Note
:能提供最大平均电流2A。
C132
22uF/6.3V/X5R
+12V_Normal
R6954
R6955
0R/NC
0R/NC
C133
靠近
22uF/6.3V/X5R/NC
+1.5V_DDR
DCDC
R6956
0R/NC
C134
0.1uF/16V/X5R
3
H115
NC
+5V_Standby
C135
C2240
靠近
10uF/10V/X5R
10uF/10V/X5R
RT8097C 2A
1
输入耐压值
C136
DCDC
BB
TP & MARK
1
H104
NC
H108
NC
H113
NC
1
H105
H106
NC
NC
1
1
H110
H109
NC
NC
H1
NC
1
1
5
1
1
H101
NC
1
1
H107
NC
H117
NC
AA
H120
NC
1
1
U106
5.5V
4
1
EN
H118
金属支架
1
2
2
H2
金属支架
0.1uF/16V/X5R
1
2
1117-3.3V
+5V_Standby
U102
ADJ
0.1uF/16V/X5R
4
OUT
IN
321
+3.3V_Standby
C110
C111
C112
10uF/6.3V/X5R
0.1uF/16V/X5R
1117-3.3V
Page 29
HDMI/Audio BlockGPIO Pull up
5
Note : Port A needs shielding ground all signal pair
CHIP_CONFIG[3:0]
{PAD_PM_LED1,PAD_PM_SPI_DI,PAD_PM_LED0,PAD_PWM_PM}
Value Description
4'b1010 1 ARM boot from ROM; outer storage is eMMC
4'b1011 ARM boot from ROM; outer storage is NAND
D DDR3-A0-T2
D DDR3-A1-T2
D DDR3-A2-T2
D DDR3-A3-T2
D DDR3-A -T2
D DDR3-A5-T2
D DDR3-A6-T2
D DDR3-A7-T2
D DDR3-A8-T2
D DDR3-A9-T2
D DDR3-A10-T2
D DDR3-A11-T2
D DDR3-A12-T2
D DDR3-BA0-T2
D DDR3-BA1-T2
D DDR3-BA2-T2
D-CSB2
D DDR3-RASZ-T2
D DDR3-CASZ-T2
D DDR3-WEZ-T2
D DDR3-ODT-T2
Connection Wire(For Speaker)
Connection Wire(Power For Mainboard)
VBO Wire
Connection Wire(For Remote and Keyboard)
WIFI Wire
1
5
4
2
3
- 36 -
Page 41
9. Trouble shooting
9-1. Simple check
Service Manual
Model No.:
- 51 -
Page 42
Service Manual
Model No.:
9-2. Main board failure check
No picture but have
sound
Check whether the normal
work of the backlight
Yes
Check if there is +12V at
Pin38 in CN202
Yes
Change LVDS
wire
No
No
Replace the
U49
Check if there is
+3-5V at Pin2-3 in
J20
Yes
Replace Power supply
No
Replace Main board
Still having
problems
Replace Main board
Change Panel
- 52 -
Page 43
Trouble Shooting
AV No sound but have picture
Check if there is sound input signal
Yes
Check if there is signal at C3 and C4
Yes
Check if there is signal at RA230 RA229 and RA40 RA228
Yes
Check if there is signal at LA3,LA8,LA16,LA15
Yes
Check the speakers
No
No
No
Check the input source
Change U201
Change L32 voltage
Change L32
Else
12V
Change UA4
Still having problems
Change Mainboard
- 53 -
Page 44
Trouble Shooting
No sound No picture NO LED indicate
Check if there is voltage in
J20(Pin1~2:12V;Pin8:5V;Pin9:2~
5V;Pin10~11:5V;Pin12:3.3V)
Yes
Check if L17(0.97V)
L102(1.06V)
L103 (1.5V) are OK
,
Yes
To upgrade
,
No
No
No
Change the mainboard
Change the
power board
Change U11 or
U104 or U106
Still having problems
Change
Mainboard
- 54 -
Page 45
Trouble Shooting
Poor sound
Poor sound
Verify if sound system is
correct .
No
Change Speaker
For ease of use, recommend that customer format the picture and sound
settings in the automatic option.
Update the software and
Still having
problems
make the reboot;
or change the
Mainboard
- 55 -
Page 46
Trouble Shooting
•Mainboard not work
•1. check if there is +12V/+5V
output on the power board
•2.Verify if the DC/DC convertors
have the right output (5V,3.3Vstandby 3.3V,1.5V,1.15V)
•3.Verify if the Mainchip
AudioAMP
•4.Verify if the FLASH(U6) has the
right software and right voltage
3.3V;
•
5.Verify if the Y1 (Crystal) has the
right frequency(24MHz)
…solder well;
(MSD308BEM),
Panel not work
1. check if the voltage input and
output of voltage boost IC of the
backlight is OK ;
2.Verify if the Mainboard output the
right On/Off signal to power board;
3.Verify if the Mainboard output the
LVDS singal to panel T-con board
4.Verify if the software is the right
version of this model.
5.Change the LVDS wire to check if
it’s broken.
- 56 -
Page 47
Trouble Shooting
Power board not work
1.Verify if the power cord connect well;
2. check if +5Vstandby of the power
board part is functioning normally;
3. Check if voltage of the POWER
ON/OFF of the power board part is on
the high level voltage;
4. check if there is +12V/+5V output on
the power board;
Check if Main board / LVDS wire /
Panel are in good condition ?
- 57 -
Page 48
9-3. Pannel failure
Failure Mode
Service Manual
Model No.:
PartName
V B/DVertical bar
V DimVertal gray line
V L/D
TCP
H B/DHorizontal bar
H Dim
DescriptionPhenomenaFailure cause
Block Defect :TCP cracking or cracking
Dim or L/D :TCP Sunken
:TCP lead cracking
:ACF bonding short
:Awful environment and
something electric enter
into LCD
:Mis-align between TCP and