Hisense MSD6886 User manual

LCDTelevision
Service Manual
Chassis： MSD6886
Version: V 1.0
Hisense Electric Co.，Ltd.
December 5, 2018

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REVISION HISTORY
Version Revise content Reviser Date
V1.00 First issued 2018-12-5

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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 How to enter the Factory OSD Menu...................................................................................................- 18 -
3.3 Factory OSD Menu...............................................................................................................................- 19 -
4. Software Upgrading........................................................................................................................................- 25 -
4.1 USB Upgrade........................................................................................................................................- 25 -
4.2 Mstar Tool upgrading............................................................................................................................- 27 -
5. Trouble shooting.............................................................................................................................................- 41 -
5.1 Troubleshooting for Remote Control....................................................................................................- 41 -
5.2 Troubleshooting for Function Key........................................................................................................- 42 -
5.3 TV won’t Power On..............................................................................................................................- 43 -
5.4 Troubleshooting for Audio....................................................................................................................- 44 -
5.5 Troubleshooting for TV/VGA/HDMI input..........................................................................................- 45 -
5.6 Troubleshooting for YPbPr input..........................................................................................................- 46 -
5.7 Troubleshooting for Video input...........................................................................................................- 47 -
6. Signals Block Diagram & power assign & schematic diagram......................................................................- 48 -

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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 (RSAG7.820.8698/ROH)

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MSD6886

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2.2 Wiring diagram( example for HE55A7000EUWUTS):
XP1： Power for main board jacket
Main board terminal Power board terminal
Pin definition Pin definition
1 GND 15 GND
3 DIMMING2/DIM1 13 BL_ANA
5 VCC_A/ VCCA1 11 16V
7 VCC_A/ VCCA1 9 16V
9 GND 7 GND
11 POWER ON/OFF/
STB1
5 STB
13 12VS/ VCC3 3 12V

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15 12VS/ VCC3 1 12V
2 BL_EN/SW1 16 SW
4 DIMMING/PWM1 14 PWM
6 GND 12 GND
8 GND 10 GND
10 ×8 NC
12 GND 6 GND
14 12VS/ VCC2 4 12V
16 GND 2 GND
XP3:Localdimming jacket
脚位 definitionillustration
Electrical
characteristics

10 GND GND0V
9 2D_3D 2D/3D 切换 0V/3V
8 LDC_VSYNC 场同步 
7 3D_GLASS_VSYNC/PWM/Error 眼镜信号/PWM/报错 0V/3V
6 LD_HSYNC/I2C_SCL 行同步/I2C 时钟 
5 GND GND 0V
4 LDC_CLK SPI 时钟 
3 LDC_DATA_O 主板->屏 
2 LDC_DATA_I 屏->主板 
1 LD_CS/I2C_SDA SPI 片选/I2C 数据 
XP2：51pin VB1 jacket
Panelterminaljacketdefinition Mainboardterminaljacketdefinition
Pin  definitionillustration Pin  Config
1VDD Power Supply Input
Voltage 51 12V-Panel
2VDD Power Supply Input
Voltage 50 12V-Panel
3VDD Power Supply Input
Voltage 49 12V-Panel
4VDD Power Supply Input 48 12V-Panel

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Voltage
5VDD Power Supply Input
Voltage 47 12V-Panel
6VDD Power Supply Input
Voltage 46 12V-Panel
7VDD Power Supply Input
Voltage 45 12V-Panel
8VDD Power Supply Input
Voltage 44 12V-Panel
9NC No Connection 43 NC PCB上×
10 GND Ground 42 R209上件0Ω
11 GND Ground 41 R207上件0Ω
12 GND Ground 40 R206上件0Ω
13 GND Ground 39 R205上件0Ω
14 GND Ground 38 R203上件0Ω
15 NC No Connection 37 R600,R612,R620 NC
16 NC No Connection 36 R602,R613,R621 NC
17 NC No Connection 35 R601,R982,R983 NC
18 SDA I2C Data signal 模组确
认I2C有隔离 34 V15上件,R195,R193上件0Ω
19 SCL I2C Data signal 模组确
认I2C有隔离 33 V13,R210,R212上件10k,C245 NC
20 NC Write Protection,
L or OPEN: Protection;
H: Writable
32 R190 NC ,V17 NC,R208 NC,R197
NC,R200 NC,R614 NC,R622 NC
21 VSYNC VSYNC OUTPUT for
local dimming 31 R616,R624 NC
22 NC No Connection 30 R189,R611,R619 NC
23 NC No Connection 29 R924,R915,R617,R625 NC
24 NC No Connection 28 R623NC,R615,R916 NC
25 HTPDN Vx1 HTPDN模组确认无隔
离27 V14上件,R179 NC
26 LOCKN Vx1 LOCK 模组确认无隔
离26 V16上件,R243,C246 NC, R211,R213上件10k
27 GND Ground 25 Ground
28 RX0N VX1 lane 0 24 VRX0_N
29 RX0P VX1 lane 0 23 VRX0_P
30 GND Ground 22 GND
31 RX1N VX1 lane 1 21 VRX1_N
32 RX1P VX1 lane 1 20 VRX1_P
33 GND Ground 19 GND
34 RX2N VX1 lane 2 18 VRX2_N

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35 RX2P VX1 lane 2 17 VRX2_P
36 GND Ground 16 VGND
37 RX3N VX1 lane 3 15 VRX3_N
38 RX3P VX1 lane 3 14 VRX3_P
39 GND Ground 13 GND
40 RX4N VX1 lane 4 12 VRX4_N
41 RX4P VX1 lane 4 11 VRX4_P
42 GND Ground 10 GND
43 RX5N VX1 lane 5 9VRX5_N
44 RX5P VX1 lane 5 8VRX5_P
45 GND Ground 7GND
46 RX6N VX1 lane 6 6VRX6_N
47 RX6P VX1 lane 6 5VRX6_P
48 GND Ground 4GND
49 RX7N VX1 lane 7 3VRX7_N
50 RX7P VX1 lane 7 2VRX7_P
51 GND Ground 1GND
XP6：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

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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 HE55A7000EUWUTS.
2.2 TV boards part list
Main board Boards function difference
Main chassis type For Series
RSAG7.820.8698\ROH
1. Lateral terminal and vertical terminal.
2. TCON part not on the board.
MSD6886
HE55A7000EUWTS
55A6500EE

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3. Factory/Service OSD Menu and Adjustment
3.1 Remote Control

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3.2 How to enter the Factory OSD Menu
. With user’s RC
1. Power TV on
2. Press button on the RC then call up “Menu” option.
3. Move and “ok “button on RC to select Sound-> Speaker
->Advanced setting -> Balance
4. On the Balance, input figure 1->9->6->9 in sequence on RC.
Note: It is important to remember that the hand fingers can’t shield the RC
emitter diode.
5. Call up a “M” on the left-top of TV, then press button again, the
Factory menu appear then.
6．DC power off and DC power on the TV, which can exit Factory OSD.

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3.3 Factory OSD Menu
figure-1

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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: