Hisense 50E77HQ User manual

LCDTelevision
Service Manual
Chassis：MT9900
Version: V 1.0
Hisense Visual Technology Co.，Ltd.
November 19, 2021

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REVISION HISTORY
Version
Revise content
Reviser
Date
V1.00
First issued
Wangyue
2021-11-19

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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 andAdjustment..................................................................................................- 17 -
3.1 Remote Control.....................................................................................................................................- 17 -
3.2 Factory OSD Menu...............................................................................................................................- 19 -
4. Software Upgrading........................................................................................................................................- 24 -
4.1 USB Upgrade........................................................................................................................................- 24 -
4.2 Flash Tool upgrading ............................................................................................................................- 26 -
5. Trouble shooting.............................................................................................................................................- 29 -
5.1 Troubleshooting for Remote Control....................................................................................................- 29 -
5.2 Troubleshooting for Function Key........................................................................................................- 30 -
5.3 TV won’t Power On..............................................................................................................................- 31 -
5.4 Troubleshooting for Audio....................................................................................................................- 32 -
5.5 Troubleshooting for TV/VGA/HDMI input..........................................................................................- 33 -
5.6 Troubleshooting for YPbPr input..........................................................................................................- 34 -
5.7 Troubleshooting for Video input...........................................................................................................- 35 -
6. Signals Block Diagram & power assign & schematic diagram......................................................................- 36 -

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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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technician 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 assumes no liability,
express or implied, arising out of any unauthorized modification of design. Service tech
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 (2RSAG7.820.11711)
The rear of main board (2RSAG7.820.11711)

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2.2 Wiring diagram( example for 55U69GEVS):
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

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12
GND
12
GND
13
12VS/ VCC2
13
12VS/ VCC3
14
12VS/ VCC1
14
12VS/ VCC2
15
12VS/ VCC2
15
12VS/ VCC3
16
GND
16
GND
XP14：51pin VBO to Tcon board
Tcon
Main board
Pin
定义
说明
Pin
Config
1
VDD
Power Supply Input Voltage
51
12V-Panel
2
VDD
Power Supply Input Voltage
50
12V-Panel
3
VDD
Power Supply Input Voltage
49
12V-Panel
4
VDD
Power Supply Input Voltage
48
12V-Panel
5
VDD
Power Supply Input Voltage
47
12V-Panel
6
VDD
Power Supply Input Voltage
46
12V-Panel
7
VDD
Power Supply Input Voltage
45
12V-Panel
8
VDD
Power Supply Input Voltage
44
12V-Panel
9
NC
No Connection
43
12V-Panel,L65 NC
10
GND
Ground
42
GND,R223--0Ω
11
GND
Ground
41
GND,R217--0Ω
12
GND
Ground
40
GND,R222--0Ω
13
GND
Ground
39
GND,R216--0Ω
14
GND
Ground
38
GND,R221--0Ω
15
NC
No Connection
37
DATA FORMAT0 R479,R495 NC
16
NC
No Connection
36
DATA FORMAT1R480,R502 NC
17
NC
No Connection
35
Mplusmodel1R207,R213,R485,R
526 NC
18
SDA
I2C Data signal
34
Panel_I2C_SDA
V16OK,R214,R816--0Ω
R326,R332--10K，C271 NC
19
SCL
I2C Data signal
33
Panel_I2C_SCL
V15,R818,R224OK
20
NC
NC
32
I2C_WP
R219,R318,R215,R220,V30,R22
0,R208,R338,R540,R799,R797N
C
21
NC
No Connection
31
Bit_sel
R825,R483,R524,R564,R798 NC
22
SEL_S
ECTIO
Low or NC: 2 section(default)
High: 4 section
30
Data format
R218NC,R478NC,R486

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N
OK
23
NC
No Connection
29
AGP R496,R484,R525 NC
24
GND
Ground
28
MSE R814 OK，R482,R523NC
25
HTPDN
Vx1 HTP
27
HTPDN V18 OK,R421 NC
26
LOCKN
Vx1 LOCK
26
LOCKN V17OK,R423,C270 NC,
R278,R277OK10k
27
GND
Ground
25
Ground
28
RX0N
VX1 lane 0
24
C_VB1_1N
29
RX0P
VX1 lane 0
23
C_VB1_1P
30
GND
Ground
22
GND
31
RX1N
VX1 lane 1
21
C_VB1_2N
32
RX1P
VX1 lane 1
20
C_VB1_2P
33
GND
Ground
19
GND
34
RX2N
VX1 lane 2
18
C_VB1_3N
35
RX2P
VX1 lane 2
17
C_VB1_3P
36
GND
Ground
16
VGND
37
RX3N
VX1 lane 3
15
C_VB1_4N
38
RX3P
VX1 lane 3
14
C_VB1_4P
39
GND
Ground
13
GND
40
RX4N
VX1 lane 4
12
C_VB1_5N
41
RX4P
VX1 lane 4
11
C_VB1_5P
42
GND
Ground
10
GND
43
RX5N
VX1 lane 5
9
C_VB1_6N
44
RX5P
VX1 lane 5
8
C_VB1_6P
45
GND
Ground
7
GND
46
RX6N
VX1 lane 6
6
C_VB1_7N
47
RX6P
VX1 lane 6
5
C_VB1_7P
48
GND
Ground
4
GND
49
RX7N
VX1 lane 7
3
C_VB1_8N
50
RX7P
VX1 lane 7
2
C_VB1_8P
51
GND
Ground
1
GND
XP15：41pin VBO to Tcon board
TCON
Main board
Pin
定义
说明
Pin
Config
1
GND
Ground
41
GND
2
Rxn8
V-by-One HS Data Lane 8
40
C_VB1_9N
3
Rxp8
V-by-One HS Data Lane 8
39
C_VB1_9P
4
GND
Ground
38
GND
5
Rxn9
V-by-One HS Data Lane 9
37
C_VB1_10N
6
Rxp9
V-by-One HS Data Lane 9
36
C_VB1_10P
7
GND
Ground
35
GND

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8
Rxn10
V-by-One HS Data Lane 10
34
C_VB1_10N
9
Rxp10
V-by-One HS Data Lane 10
33
C_VB1_10P
10
GND
Ground
32
GND
11
Rxn11
V-by-One HS Data Lane 11
31
C_VB1_10N
12
Rxp11
V-by-One HS Data Lane 11
30
C_VB1_10P
13
GND
Ground
29
GND
14
Rxn12
V-by-One HS Data Lane 12
28
C_VB1_10N
15
Rxp12
V-by-One HS Data Lane 12
27
C_VB1_10P
16
GND
Ground
26
GND
17
Rxn13
V-by-One HS Data Lane 13
25
C_VB1_10N
18
Rxp13
V-by-One HS Data Lane 13
24
C_VB1_10P
19
GND
Ground
23
GND
20
Rxn14
V-by-One HS Data Lane 14
22
C_VB1_10N
21
Rxp14
V-by-One HS Data Lane 14
21
C_VB1_10P
22
GND
Ground
20
GND
23
Rxn15
V-by-One HS Data Lane 15
19
C_VB1_16N
24
Rxp15
V-by-One HS Data Lane 15
18
C_VB1_16P
25
GND
Ground
17
GND,R634OK
26
GND
Groun
16
GND，R636OK
27
NC
No Connection
15
Ground，R637 NC
28
NC
No Connection
14
GND R635 NC
29
NC
No Connection
13
NC
30
NC
No Connection
12
12V panel L82 NC
31
NC
No Connection
11
12V panel L81 NC
32
NC
No Connection
10
12V panel L80 NC
33
NC
No Connection
9
12V panel L79 NC
34
NC
No Connection
8
12V panel L78 NC
35
NC
No Connection
7
12V panel L77 NC
36
NC
No Connection
6
12V panel L76 NC
37
NC
No Connection
5
12V panel L75 NC
38
NC
No Connection
4
12V panel L74 NC
39
NC
No Connection
3
12V panel L73 NC
40
NC
No Connection
2
12V panel L72,R829 NC
41
NC
No Connection
1
12V panel L71,R828 NC
XP5：Speaker jacket
Pin
definition
illustration
Wire color
1
L+
Left speaker positive wire
RED
2
L-
Left speaker negative wire
WHITE
3
R-
right speaker negative wire
WHITE
4
R+
Right speaker positive wire
BLACK

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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 55U69GEVS.
2.2 TV boards part list
Main board
Boards function difference
Main chassis type
For Series
2RSAG7.820.11711\R
OH
1. Lateral terminal and vertical terminal.
2. Different AMP design
3.Adapt different panel，such as OLED and LCD
MT9900
55U69GEVS
RSAG7.820.11959\RO
H
1. Lateral terminal and vertical terminal.
2. Different AMP design
3.Adapt different panel，such as OLED and Mini
LED
MT9900
65E80GEVS

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

- 18 -

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3.2 Factory OSD Menu
figure -1
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

- 20 -
market and customer. Take 55U69GEVS for example.
Options:
Write keys:
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.