LCD Television
Service Manual
Chassis： NT72671
Version: V 1.0
Hisense Visual Technology Co.，Ltd.
December 2, 2020
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REVISION HISTORY
Version
Revise content
Reviser
V1.00
First issued
Zhangxue
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Contents
Contents ....................................................................................................................................................................... - 3 -
Service Manual ........................................................................................................................................................... - 4 -
1. Precautions and notices ..................................................................................................................................... - 4 -
1.1 Warning ................................................................................................................................................... - 5 -
1.2 Notes ....................................................................................................................................................... - 7 -
2. TV boards: ...................................................................................................................................................... - 10 -
2.1 Main board layout ................................................................................................................................. - 10 -
2.2 TV boards part list ................................................................................................................................ - 16 -
3. Factory/Service OSD Menu and Adjustment .................................................................................................. - 17 -
3.1 Remote Control ..................................................................................................................................... - 17 -
3.2 Factory OSD Menu ............................................................................................................................... - 19 -
4. Software Upgrading ........................................................................................................................................ - 25 -
4.1 USB Upgrade ........................................................................................................................................ - 25 -
4.2 Novatek Tool upgrading ....................................................................................................................... - 27 -
5. Trouble shooting ............................................................................................................................................. - 30 -
5.1 Troubleshooting for Remote Control .................................................................................................... - 30 -
5.2 Troubleshooting for Function Key ........................................................................................................ - 31 -
5.3 TV won’t Power On .............................................................................................................................. - 32 -
5.4 Troubleshooting for Audio .................................................................................................................... - 33 -
5.5 Troubleshooting for TV/VGA/HDMI input .......................................................................................... - 34 -
5.6 Troubleshooting for YPbPr input .......................................................................................................... - 35 -
5.7 Troubleshooting for Video input ........................................................................................................... - 36 -
6. Signals Block Diagram & power assign & schematic diagram ...................................................................... - 37 -
- 4 -
Service Manual
1. Precautions and notices
BEFORE SERVICING THE LCD TV, READ THE SAFETY PRECAUTIONS IN
THIS MANUAL.
USE ONLY MANUFACTURER SPECIFIED REPLACEMENT PARTS WHEN
SERVICING.
USE OF NON-AUTHORIZED PARTS WILL VOID THE MANUFACTURE'S
WARRANTY
Proper service and repair is important to the safe, reliable operation of all Hisense
Equipment. The service procedures recommended by Hisense and described in this
Service Guide are effective methods of performing service operations. Some of these
service operations require the use of tools specially designed for the purpose. The special
tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES
which should be carefully read in order to minimize the risk of personal injury to service
personnel. The possibility exists that improper service methods may damage the
equipment and pose risk of personal injury
. It is also important to understand that these CAUTIONS and NOTICES ARE NOT
EXHAUSTIVE. Service should only be performed by an experienced electronics
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techician trained in the proper Television safety and service methods and procedures
Hereafter throughout this manual.
1.1 Warning
1.1.1
Critical components having special safety characteristics are identified with a by the
Ref. No. in the parts list. Use of non-manufacturer's recommended parts may create
shock, fire, or other hazards. Under no circumstances should the original design be
modified or altered without written permission from RCA. Hisense Eassumes no
liability, express or implied, arising out of any unauthorized modification of design.
Servicetech assumes all liability.
1.1.2.
All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD).
Careless handling during repair can reduce life drastically. When repairing, be sure to
use anti-static table mats and properly use a grounding wrist stra. Keep components and
tools also at this same potential.
IMPORTANT:
Always disconnect the power cord from AC outlet before replacing parts or modules.
1.1.3
To prevent electrical shock, use only a properly grounded 3 prong outlet or extension
cord.
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1.1.4
When replacement parts are required, be sure to use replacement parts specified by the
manufacturer or have the same characteristics as the original part. Unauthorized
substitutions may result in fire, electric shock, or other hazards and will void the
manufacturer's warranty.
1.1.5
Safety regulations require that after a repair the set must be returned in its original
condition. In addition, prior to closing set, check that:
-Note:
>All wire harnesses and flex cables are properly routed and secured with factory tape
and/or mounted cable clamps.
> All cables and connectors are properly insulated and do not have any bare wires/lead
exposed
1.1.6
(1) Do not supply a voltage higher than that specified to this product. This may
damage the product and may cause a fire.
(2) Do not use this product:
> High humidity areas
> In an area where any water could enter or splash into the unit.
High humidity and water could damage the product and cause fire.
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(3) If a foreign substance (such as water, metal, or liquid) gets inside the panel
module, immediately turn off the power. Continuing to use the product may cause fire
or electric shock.
(4) If the product emits smoke, and abnormal smell, or makes an abnormal sound,
immediately turn off the power. Continuing to use the product, it may cause fire or
electric shock.
(5) Do not pull out or insert the power cable from/to an outlet with wet hands. It may
cause electric shock.
(6) Do not damage or modify the power cable. It may cause fire or electric shock.
(7) If the power cable is damaged, or if the connector is loose, do not use the product:
otherwise, this can lead to fire or electric shock.
(8) If the power connector or the connector of the power cable becomes dirty or dusty,
wipe it with a dry cloth. Otherwise, this can lead to fire.
(9) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,
or sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip-over
1.2 Notes
Notes on Safe Handling of the LCD panel and during service
The work procedures shown with the Note indication are important for ensuring the
safety of the product and the servicing work. Be sure to follow these instructions.
• Before starting the work, secure a sufficient working space.
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• At all times other than when adjusting and checking the product, be sure to turn OFF
the POWER Button and disconnect the power cable from the power source of the TV
during servicing.
• To prevent electric shock and breakage of PC board, start the servicing work at least 30
seconds after the main power has been turned off. Especially when installing and
removing the power board, start servicing at least 2 minutes after the main power has
been turned off.
• While the main power is on, do not touch any parts or circuits other than the ones
specified. If any connection other than the one specified is made between the measuring
equipment and the high voltage power supply block, it can result in electric shock or
may trip the main circuit breaker When installing the LCD module in, and removing it
from the packing carton, be sure to have at least two persons perform the work.
• When the surface of the panel comes into contact with the cushioning materials, be
sure to confirm that there is no foreign matter on top of the cushioning materials before
the surface of the panel comes into contact with the cushioning materials. Failure to
observe this precaution may result in, the surface of the panel being scratched by foreign
matter.
• Be sure to handle the circuit board by holding the large parts as the heat sink or
transformer. Failure to observe this precaution may result in the occurrence of an
abnormality in the soldered areas.
• Do not stack the circuit boards. Failure to observe this precaution may result in
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problems resulting from scratches on the parts, the deformation of parts, and
short-circuits due to residual electric charge.
• Perform a safety check when servicing is completed. Verify that the peripherals of the
serviced points have not undergone any deterioration during servicing. Also verify that
the screws, parts and cables removed for servicing purposes have all been returned to
their proper locations in accordance with the original setup.
The lightning flash with arrowhead symbol, within an equilateral triangle is
intended to alert the user to the presence of uninsulated dangerous voltage within the
products enclosure that may be of sufficient magnitude to constitute a risk of electric
shock.
The exclamation point within an equilateral triangle is intended to alert the
service personnel to important safety information in the service literature. .
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2. TV boards:
2.1 Main board layout
2.1.1 The top of main board (RSAG7.820.10588/ROH)
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NT72671
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2.2 Wiring diagram( example for 50A683FEVS):
XP1： Power for main board jacket
Main board terminal
Power board terminal
Pin
definition
Pin
definition
1
GND
1
GND
2
BL_EN/SW
2
BL_EN/SW1
3
DIMMING2/PWM2
3
DIMMING2/DIM1
4
DIMMING/PWM
4
DIMMING/PWM1
5
VCC_A
5
VCC_A/ VCCA1
6
GND
6
GND
7
VCC_A
7
VCC_A/ VCCA1
8
GND
8
GND
9
GND
9
GND
10
3DEN-NC
10
NC
11
PWR-ON/OFF/ STB
11
POWER
ON/OFF/ STB1
12
GND
12
GND
13
12VS/ VCC2
13
12VS/ VCC3
- 13 -
14
12VS/ VCC1
14
12VS/ VCC2
15
12VS/ VCC2
15
12VS/ VCC3
16
GND
16
GND
XP11：68pin ISP jacket
Panel terminal jacket definition
Main board terminal jacket definition
Pin
definition
illustration
Pin
Config
68
NC
1
NC
67
NC
2
TER_CHOT
66
NC
3
ISP_RST
65
TEND
4
TER
64
VCE
5
X0B_YCLK
63
LC
6
X0B_LC
62
YDIO1
7
YDIO1
61
GND
8
GND
60
P2P12N
9
X0B_1P
59
P2P12P
10
X0B_1N
58
GND
11
GND
57
P2P11N
12
X0B_2P
56
P2P11P
13
X0B_2N
55
GND
14
GND
54
P2P10N
15
X0B_3P
53
P2P10P
16
X0B_3N
52
GND
17
GND
51
P2P9N
18
X0B_4P
50
P2P9P
19
X0B_4N
49
GND
20
GND
48
P2P8N
21
X0B_5P
47
P2P8P
22
X0B_5N
46
GND
23
GND
45
P2P7N
24
X0B_6P
44
P2P7P
25
X0B_6N
43
GND
26
GND
42
P2P6N
27
X0B_7P
41
P2P6P
28
X0B_7N
40
GND
29
GND
39
P2P5N
30
X0B_8P
38
P2P5P
31
X0B_8N
- 14 -
37
GND
32
GND
36
P2P4N
33
X0B_9P
35
P2P4P
34
X0B_9N
34
GND
35
GND
33
P2P3N
36
X0B_10P
32
P2P3P
37
X0B_10N
31
GND
38
GND
30
P2P2N
39
X0B_11P
29
P2P2P
40
X0B_11N
28
GND
41
GND
27
P2P1N
42
X0B_12P
26
P2P1P
43
X0B_12N
25
GND
44
GND
24
P2P_LOCK
45
P2P_LOCK
23
GND
46
GND
22
MISO
47
SPI_PANEL_MISO
21
MOSI
48
SPI_PANEL_MOSI
20
SCLK
49
SPI_PANEL_CLK
19
CS
50
SPI_Demura_CS
18
GND
51
GND
17
NC
52
T_nWR
16
S_SCL
I2C_CLK
53
T_SCL
15
S_SDA
I2C_DATE
54
T_SDA
14
GND
Ground
55
GND
13
GND
Ground
56
GND
12
GND
Ground
57
GND
11
GND
Ground
58
GND
10
GND
Ground
59
GND
9
NC
No Connection
60
NC
8
VCC_PANEL
Power Supply Input
Voltage
61
12V-Panel
7
VCC_PANEL
Power Supply Input
Voltage
62
12V-Panel
6
VCC_PANEL
Power Supply Input
Voltage
63
12V-Panel
5
VCC_PANEL
Power Supply Input
Voltage
64
12V-Panel
4
VCC_PANEL
Power Supply Input
Voltage
65
12V-Panel
3
VCC_PANEL
Power Supply Input
Voltage
66
12V-Panel
2
VCC_PANEL
Power Supply Input
67
12V-Panel
- 15 -
Voltage
1
VCC_PANEL
Power Supply Input
Voltage
68
12V-Panel
XP7：Speaker jacket
Pin
definition
illustration
Wire color
1
L+
Left speaker positive wire
红
2
L-
Left speaker negative wire
白
3
R-
right speaker negative wire
白
4
R+
Right speaker positive wire
红
2.3 Ties,clamps and tapes:
to show the positions where ties and clamps and tapes should be, for checking after
servicing, Before disassemble the TV ,besure to take photes for the TV assembly example
for 50A683FEVS.
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2.2 TV boards part list
Main board
Boards function difference
Main chassis type
RSAG7.820.10588/RO
H
1. Lateral terminal and vertical terminal.
2. TCON part on the board.
NT72671
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3. Factory/Service OSD Menu and Adjustment
3.1 Remote Control
- 18 -
- 19 -
3.2 Factory OSD Menu
figure -1
- 20 -
Factory OSD menu list: if you want to learn more about TV, you’d better read it but
would not adjust the value please. The Factory menu may be have difference for diverse
market and customer. Take HE55A7000EUWTS for example.
Options:
Write keys:
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Note:
Check whether the Key information under the current Version is OK, if appears “NG” or such as following
red surround irregular information then need rewrite the key.
- 22 -
Factory menu
Description
Remark
Menu
White Balance
White Balance data adjusting, different source
has different WB values. Before adjusting,
please change to desired source.
channel init
TV Produce signal preset, during the factory
produce using.
Option
Items can choose
Clear all
initial the TV，EEPROM reset
Soft version
current software version information
Version
Software Version information
MAC Adr
MAC address information
HDCP2.2 key
HDCP2.2 key information
ESN
The TV’s electronic Serial number
WIDEVINE key
WIDEVINE key code
Service No.
LTDNXXXXXXY-P0001
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Channel init
huangdao old
Qing Dao
TV Produce signal preset, during the
factory produce using.
huangdao new
……
- 24 -
Option
ToFAC M/U
"M" used in factory product.
"U" used in user state.
LNB power
13/14;18/19;Power off
Region
North America
country
Country choose
Logo
Customer logo choose
Language
Language choose
VCOM
Panel voltage,
UART
On/off (when choose "on" then can serial port
connect with Tool successfully)
PQ COM
On/off
Write keys
CI+
MAC
If MAC key code lost, you can write.
HDCP2.2
If HDCP key code lost, you can write .
Netflix
If Netflix key code lost, you can write .
Widevine
If Widevine key code lost, you can write .
Note:
The Factory menu may be have difference for diverse market and customer, above Factory
menu only for reference.
The factory menu data varies according to different sources. Incase changing the factory data by error, you can
choose to “Clear all”, by which you can resume the default value.
To clean the EEPROM:
a. Select the item “Option”--“Clear all” in Factory mode.
b. Press button to clear the EEPROM data.
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c. Close the OSD menu after 5 seconds.
d. Restart the TV.
e Also the Keys information must been checked, if appear “NG”, then must rewrite key code.
4. Software Upgrading
4.1 USB Upgrade
Main software upgrade directly with USB
The main software can be upgraded with USB disk. It includes two modes: user mode、 factory mode.
Take 50A683FEvS for example.
4.1.1 TV in user mode：
a. Decompress NOVATEK_DEV_EU_pkg_YYYYMMDD.tar.gz (YYYYMMDD is the year/month/day when the
software is being built, such as NOVATEK_DEV_EU_pkg_20201130.tar.gz) and copy
usb_NOVATEK_DEV_EU.bin file to the USB root directory. Please make sure the USB disk format is Fat32，
and there are no other “*.bin” files in the root directory of USB disk .
b. AC power off the TV, insert the USB disk to the USB 2.0 port, TV in standby status,next long press the “power
key . If “Loading data……” is shown on TV, it means TV successfully enters upgrading status..
c. Waiting TV is trying to load the software and it will spend about 2 minutes. After that “UPGRADING
SOFTWARE, PLEASE DO NOT TURN OFF” will be displayed and upgrade process bar will indicate the
progress. It needs about s5 minutes to complete the whole software upgrade.
d. After upgrade, TV can automatically reboot.
e. Enter the Factory OSD Menu to check the main software version, and then choose “option”“Clear All” to do
clean up.
4.1.2 TV in factory mode：
a. If TV is in Factory mode, only have difference from chapter 4.1.1 b. as following. others are same.
b. TV is in factory mode, only AC power off TV and insert the USB disk, next AC power on, TV can identify
automatically to update, till call up “Loading data……” interface , update process bar is 1%.
4.1.3 If the above USB upgrade methods fail, you can rename the upgrade software to
usb_NOVATEK_DEV_EU.bin,next use serical “cu” to update
4.1.4 When upgrade successfully, We must ensure the TV mode of running correctly.
Paths: Factory---Design –Project ID
Once choose another TV mode ,must AC power off and power on the TV to reboot.
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Firgure-1: Upgrading software
Firgure-1
- 27 -
4.2 Novatek Tool upgrading
If USB upgrades failure, TV crashed and SecureCRT no print message. Repairer must read IC device
ID code 、 decipher& burn the Mboot program the EMMC flash first. then USB disk to upgrade the
“usb_NOVATEK_DEV_EU.bin”file.
Hardware connecting
Connect the unit to your pc with Hisense USB-serial port cable. USB port connects to your PC and
earphone port to TV’s CN7(earphone hole). As following.
Earphone port Connect to
the TV earphone hole (CN7)
USB Connect to the
PC
- 28 -
4.2.1 Open the UART serial option
UAR serial choose “on “
Menu: Factory-->Options–>UART–>on
If finish the updating and data adjust UART serial, UART choose “off “
4.2.2 Novatek USB-serial driver
It’s the same as Mstar bebug Tool.
If First use Mstar bebug Tool, you have to install drive software for bebug board.
If your PC is Windows XP system:
First install FTCUNIN.EXE of FTC100103(MSTAR) rar file in your PC.
This is a drive software of Mstar
- 29 -
Another:
If your PC is Win7 system, you will have to install CDM20802_Setup_WIN7 rar file，and then open the
software of SecureCRT in your PC.
4.2.3 Stop board serial connect with SecureCRT
Run SecureCRT,printing information includes three status:Mboot\Supernova\no print information.
Current steps:
1) Run SecureCRT.exe
2) TV power on.
3) SecureCR tool print information can appear or not.
How to distribute the three status?
1) appearing “N62020_A32_SEC>” that meaning is in Mboot status;
2) Rolling many informmation automatically that meaning is in Supernova status;
3) No any print information that meaning the eMMC of board is no program.
Stop board serial with SecureCRT
1) In mboot status:
N62020_A32_SEC>
Input “shift” and “~” key to ensure, then close the SecureCRT window.
2) If no any print information with SecureCRT,then can directly close the SecureCRT window.
- 30 -
5. Trouble shooting
5.1 Troubleshooting for Remote Control
Remote control does not work
Try new batteries
Replace RC
Check IR receiver
Change Led & IR board
Change Led & IR cable
Replace main board
Replace battery
Replace remote control
Replace Led & IR BD
Replace Led & IR cable
YES
YES
NO
YES
NO
YES
NO
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5.2 Troubleshooting for Function Key
Buttons does not work
Check switches
Check key board
Check Key BD cable
Change Key BD
cable
Replace main board
Check solder connections and see if
any switches are stuck.
Replace Key BD
OK
YES
YES
NO
YES
NO
NO
- 32 -
5.3 TV won’t Power On
Notice:
Make Sure Power
source is live
Replace Power Cord
Check/replace IR BD or
Keypad PCA
TV won’t power on
Is LED
light?
NO
YES
Check Power
Output
YES
NO
Check Power
Cord
Only
one works
Replace Main
BD
Try Power on by
RC and Button
Neither
works
Both
Work
Power on
OK
YES
NO
Replace Power BD
YES
NO
RED
No light
Panel Bright
NO
Replace Main BD
NO
YES
Check signal
Source
YES
NO
YES
Replace Panel
(to contact Hisense tech support.)
OK
MSD6586 Europe market：
TV work normally indication led is no light.
TV standby indication led is red.
- 33 -
5.4 Troubleshooting for Audio
No sound
Check connecter
Check speaker wire
Replace main board
Reconnect
Replace speaker wire
YES
YES
NO
NO
Check speaker set
Replace speaker set
YES
NO
OK
YES
Power Supply Board
- 34 -
5.5 Troubleshooting for TV/VGA/HDMI input
No picture on the screen
Check Signal Source
Check connect
Check cable
Replace main board
Make sure signal
source is available
Reconnect
Replace cable
NO
YES
YES
NO
NO
- 35 -
5.6 Troubleshooting for YPbPr input
No picture on the screen
Check Source work or not
Check connect
Check Wires (Green Blue, Red)
Replace main board
Check Source Device
Reconnect
Replace wires
NO
YES
YES
NO
YES
NO
- 36 -
5.7 Troubleshooting for Video input
No picture on the screen
Check Source work or not
Check connect
Check Cable/ Wires
Replace main board
Check Signal Source
Reconnect
Replace Cable/Wires
NO
YES
YES
NO
YES
NO
- 37 -
6. Signals Block Diagram & power assign & schematic diagram
- 38 -