Desay M8 User manual

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8mm Pixel Pitch with SMD LEDs
M8
Outdoor LED Display Users Manual
Operation Manual
19-Mar.-2015
Document version 1.0M

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Attention
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN THE PANEL ACCESSIBLE
DOORS WHEN POWER IS ON.
Always ensure that the unit is properly earthed and power connections correctly made.
This equipment must be supplied from apower system providing aPROTECTIVE EARTH
connection and having aneutral connection, which can be reliably identified.
The power outlet supplying power to the unit should be close to the unit and easily accessible.
Always remember to close and lock the panel access doors after servicing and before resuming
the power supply.
Ensure whole system power off before connect or disconnect the net cable.
This pluggable type Aequipment is professional installable.
For pluggable equipment, the socket-outlet shall be installed near the equipment and shall be
easily accessible.
Always remember to dry the panel fully before packing .
Store in adry and airy place .
This is aclass Aproduct. In adomestic environment this product may interference in which case
the user may be required to take adequate measure.

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TABLE OF CONTENTS
1General………………….………………....................………………….………………………………......…………….. 4
1.1 M8 LED panel specification …….…………………………………………....….............………………............. 5
2Main Assemblies………………….……….....................………..…………………………………………………...... 6
2.1 Main Composition of display unit …………………………..................……...……………………..........…... 6
2.1.1 Component placement ……………….....................……………….……………………………………......……... 6
2.2 Intelligent modules (IM)………………….........................…………….……………………………………..……... 7
2.3 Hanging Stacker (HB) ………………………………………… ..............…………………...…………………..…... 8
2.4 Stacker &Base……………………….……………………………...…………………............................………….……9
2.4.1 Base ……………………………………………………………..………………............................………………..…….…. 9
2.4.2 Stacker ……………………………………………………………………………..................……………………...….… 10
2.5 Truss ……………………………………………………….....................…………………………………................…... 10
3Installation Guides…………………………………………………………………....................…………..…….…. 11
3.1 Mechanical……………………………………………………………………………………......................……..…...... 11
3.1.1 Rigging/Hanging Installation ……………………………………........……………………………..………….. 12
3.1.2 Stacking Installation ………………………………………………….....……………………………................…….13
3.2 Electrical……………………………………………………..........................……………………………………..……….14
3.2.1 Circuit protection………………………………………………....................………………………………..……....... 14
3.2.2 Earth leakage considerations……………………….............…………………………………………..………….. 14
3.2.3 Inrush-current and over-current considerations……………..…………………………………………..... 14
3.2.4 Earthing………………………………………………………………........................……………………..….………...... 14
3.2.5 MC statement………………………………………………........................…………………………………………….15
3.3 Power Cabling Wiring………………………………………………...............……………………..…….……....…15
3.3.1 AC Power…………………………………………………….........................……………………………………….….... 15
Appendix A : M8 Mechanical Assembly &Wiring Diagram.......................................................... 16
Appendix BProcedure for IM, Power supply& receiving cards Replacement.......................... 17
Appendix CTrouble shooting ………………...……….……………………........................................... 19

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1. General
Thank to use DESAY’Sled display screen and the relative devices.
This manual mainly introduces basic parameters and operation method of M8. A Led display screen
involves cabinet, Main controller, Branch controller, HUB, computer and other peripheral.
The M8 is easy to install and operate, with powerful functions, with low requirements on working
environment and high protection rate. And it can realize intelligent power on/off &24 hrs timing
on/off. These above aspects perfect the display function.
Address: Huizhou DESAY Intelligent Technology Co., Ltd. DESAY 3rd Industry Zone, Chenjiang,
Huizhou, Guangdong Province, China
Tel: [phone]（Headquarter in Huizhou）
Fax: [phone] （Shenzhen office）
Website: http://www.desayopto.com

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1.1 M8 LED Panel Specifications
M8 Specification
No
.
Specifications
Parameters
1
Model No.
M8
2
Pixel pitch
physical pitch:≥8 mm
3
Brightness
≥6000 nit
4
Pixel configuration
SMD 3in1
5
Pixel density
25600 pixels/sqm
6
Viewing angle (min. 50%
brightness)
Horizontal: 140 degree (+70/-70)
Vertical:120degree (+60/-60)
7
Lifetime (full white –50%
brightness)
≥100,000 Hours
8
Power consumption /sqm
Max.: 450W Avg.: 160W
9
Refresh frequency
≥2000Hz
10
Colors
281trilion
11
Weight/panel
16.6Kg
12
Control system
Nova system
13
Certification
CE
14
Module size
400mm×150mm
15
Panel size
800mm(W)×900mm(H) =0.72sq.m
16
Recommended viewing distance
≥8m
17
Operating environment
Temperature: 10°C～+40°C; Humidity: 10%～95%
18
Input voltage
110~230V/AC(±10%)
19
Input power frequency
50/60Hz

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2. Main Assemblies
2.1 Main Composition of display unit
Item
Description
Qty(PCS)
1
Intelligent Module (IM) including IM driver /LED PCBA
12 PCS
2
Reception board+ HUB
1
3
5V 300W Switched Mode Power Supply
2
4
Power connector
2
5
signal connector
2
2.1.1 Component Placement
Fast lock
Power/data out
Indicator
light
IM NO.
IM
Handle
Power supply lock
Heat sinks
Label
Lock buckle
Data/power in

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2.2 Intelligent module (IM)
Module usage: module is avery important part of display unit, it can convert video signal into
optoelectronic signal, finally return to video image.
Failure Analysis: When the display module does not work normally ,they generally will show ablack
screen, full white, flashing, color cast, multi-line black LED lamp dots, etc., and may affects next
module’sworking.
Note: Be sure to turn off the power before replacing the module, pay attention to the method and
strength when pulling out and inserting the power cable and flat cable, dot not damage the
power cable, when plugging the power cable, pay attention to insert to the corresponding place,
cannot misplace or reverse insert, the flat cable insert should choose the right place, do not
reverse insertion.
IM Model
PCB
Data/power supply interface

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2.3 Hanging Bracket (HB)
（hanging bracket） （double hanging bracket）
The hanging bracket (HB) is alifting device specially designed to lift one or several panels that have
been locked together, and thus form acolumn or astack. When screens are rigged or flown from a
truss, the HB will form the connection between the truss and the column of the screen. Subsequently
the HB holds the complete weight of this column. It is important to keep the HB in good condition and
check it before use.
Mechanism is basically made of the locking rod inside the centre door of the panel. To lock the panel
to the HB, you need to insert the kingpin through the hole in the HB, and then turn the locking rod
(inside the centre door of the panel), so that the kingpin can slide into the locking position on the HB.
When using the hanging brackets, the operator should make sure that the kingpin of the
panel is locked onto the hanging bracket.
Specification of the SHB (size: W x H x D)
Dimensions (hanging bracket including connection piece ): 799.5 x100 x50mm
Weight (hanging bracket): 3.8 Kg
Specification of the DHB (size: W x H x D)
Dimensions (double hanging bracket including connection piece): 1599 x100 x50mm
Weight (double hanging bracket): 8.5Kg

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2.4 Stacker &Base
（Double stacking +base）（Triple stacking +double base）
2.4.1 Base
The base is used for stacking ascreen. It uses the same locking system as
panels, so the kingpin on the base is locked into the panel. The base has
adjustable feet to level out the screen.
Specification of the Base (size: L x H x W)
Dimensions (base): 1795 x350x 50 mm
Weight (base): 8.0 Kg

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2.4.2 Stacker
（double stacking）（Triple stacking）
The stacker is an external buttress used when the screen is stacked. These stackers can be locked onto
the back of the panel to give the stacked panels extra support. There are two types of stacker available:
double stacker and triple stacker, which can lock respectively 2or 3panels on the stack. By combing
these, ascreen with uneven rows can be made. The stacker must be locked onto the ski or onto the
stacker underneath using the locking rod and the extra security pin. The stackers are locked onto the
panel using the connection screws. Stackers must be used at all times when screens are stacked. The
stacker should be properly locked to the panel and ski/base.
Specification of the Stacker (size: L x H x W)
Dimensions (double stacker): 1600 x150 x100mm
Weight (double stacker): 22 Kg
Dimensions (triple stacker): 2400 x150x 100mm
Weight (triple stacker): 32 Kg
2.5 Truss
The Truss is an external buttress used when the screen is stacked. These Truss can be
locked onto the back of the panel to give the stacked panels extra support. The truss
can lock respectively 2or 3panels on the stack. By combing these, ascreen with
uneven rows can be made. The Truss must be locked onto the ski. The Truss are
locked onto the panel using the connection screws.
Truss must be used at all times when screens are stacked. The Truss should be
properly locked to the panel and ski/base.
Specification of the Truss (size: H x W)
Dimensions (Short): 1795 x350 mm
Weight: 7Kg

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3. Installation Guidelines
Please read the following carefully before installing the panels
3.1 Mechanical
The M8 panels can be installed in two ways: rigging/hanging or stacking/ground support. In either
case, it is important to ensure that the entire screen is correctly aligned both vertically and horizontally,
to ensure there are no visible gaps.
The principle is to build several panels vertically on top of another and horizontally next to another.
The panels are locked together both vertically and horizontally, so that they can form one surface of
screen-configuration.
Locking mechanisms (4 lockers: Up &left )at the panel does the horizontal &vertical locking of the
panels on to each other. Each panel has been tested with aweight of 2.5tons attached to the bottom
locking mechanism. The Top locker is then attached to ahoist and the whole is lifted into suspension.
As panels are locked to one another, each panel forms acritical element of the complete structure.
Especially when screens are rigged or flown, the top panel of each column (or stack) supports its own
weight plus that of the number of panels underneath in the same column. In the stacked screens,
the bottom panel supports the weight of the whole column.
Lock
Loosen

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3.1.1 Rigging/Hanging Installation
When ascreen must be rigged, astructure must be placed before the building of the actual screen can
start. The screen engineer makes sure that the structure is correctly built and that it is intended for the
correct weight and size of the screen. The screen engineer must make the same checks for the beam,
beam trolleys, motors or any other devices that form apart of the structure or the lifting devices.
Consult for maximum height of screen in next section.
Notes:
1）A base can never be used without atruss.
2）The motor must always be secured with asteel cable or astrap.
3）Hanging structure verified with TUV strength test 1.8tons
3.1.1a To rig asingle column of ascreen
1Attach the hanging bracket to the hanging motor (with turnbuckle) and hoist it up.
2Lock and secure the panel onto the hanging bracket with the locking system.
3Repeat for all the columns.
4Place the columns next to each other and lock the panels horizontally.
5Bring the next panel straight under the row that is already hanging on the motor.
6Lock and secure the panel on the hanging panel. Repeat for other columns and lock
horizontal. Finally hoist up the 2rows of panels. Continue this process until the screen column
is finished.
3.1.1b To rig the screen in row direction
The side lock is used to lock the columns of panels next together to form the rows.
Safety while in use:
When the installation is finished, steel cables or straps can secure the columns.Cables or straps
must be attached to the screen so that it can rock back and forth, but cannot move to far to the front
or to the back. Make sure everything is locked &secured.
double stacking

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3.1.2 Stacking Installation
Before starting make sure that the surface, on which the screen
is to be build, is strong enough to hold all the weight, including
counterweights. Consult for maximum height of screen in
next section.
Procedure for stacking installation:
1Place the base with the one or two short skis. If
necessary you can place an extension ski locked onto ashort ski.
Lock the connection screws of the skis onto the bases and level
out with the adjustable feet. Do this for all bases and lock these
together and level out.
2Place the first row of panel onto the base and lock.
3Lock the panels horizontally together.
4Place and lock the next row(s) onto the panels and also
lock horizontally.
5Depending on the height of the total screen you now lock
adouble (two panels high) or triple stacker (three panels high)
onto the panels.
6Continue this procedure for all the rows. Make sure to
lock firmly and the stackers must be lock onto each other.
Safety while in use:
When dismounting the screen care must be taken that the
horizontal locking is undone before attempting to hoist the
panels.
Truss
Stacking
Base

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3.2 Electrical
The power distribution system used must provide adequate protection against excess line current and
leakage currents to earth.
Electrical Characteristics for ONE M8
For large installations, athree-phase supply is recommended and the power from each phase should
be distributed evenly to the single-phase appliance coupler on each panel. The screen may be
conveniently split into sections (e.g. rows or columns), each powered from asingle phase.
3.2.1 Circuit Protection
Each section of the screen should be protected by aCircuit Breaker to protect against high fault
currents, and aResidual Current Device (RCD) to detect earth leakage currents.
3.2.2 Earth Leakage Considerations
To reliably operate aLED video screen, the leakage value figure per panel must be known, or if the
leakage value is close to the breaker trip value, the breaker may trip at avery inopportune time.
Ensure that the total leakage current value per earth leakage breaker is at least 10% (preferably 20%)
below the value earth leakage breaker trip point to ensure that nuisance tripping does not occur. Earth
leakage current is normally aconstant value, but can increase in wet or humid weather, so this margin
is suggested.
Each panel of the system has earth leakage current contributions from two switched-mode power
supplies and one RFI filter. The total earth leakage current per panel can be up to 3mA at 240V. If a
24mA RCD is used, then the maximum number of panels per section should be safely limited to 8.
3.2.3 Inrush-current and over-current considerations
Video screen panels draw avery high in-rush or surge current at the moment of switch-on. This
current can be twenty times the maximum operating current of the panel, but occurs only for avery
short time –typically less than half an AC power cycle –less than 10 ms.
On each M8 panel the in-rush current is 180A at 230V. However, maximum current in the steady-state
for apanel is considerably less: 2 A at 240 volts. This high in-rush current needs to be considered when
selecting asuitable circuit breaker to feed the panels. In choosing the circuit breaker, both the
maximum operating current and the in-rush (surge) current need to be considered.

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3.2.4 Earthing
Each panel is separately connected to the ac power distribution system’searth though the appliance
coupler’sgreen/yellow wire connection. All exposed panel metalwork (main frame and doors) is also
connected to this earth.
If the framework is earthed only through each panel (i.e. through the panel’smounting bolts), there is
apossibility of electrical damage if awiring fault occurs, or if an electrical discharge, such as lightning
strike, hits the panels. Under these circumstances, the current discharge path will be through the panel
to earth rather than through the framework to earth. When permanently installed on ametal
framework, the framework itself should be directly connected to earth.
3.2.5 FCC Statement
This equipment has been tested and found to comply with the limits for aClass Adigital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in acommercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in aresidential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense. (in order to realize this one
product must be in conformity with the EMC standard screen, common case is not suitable )
*Note: Modifications not authorized by the manufacturer may void users authority to operate this
device. The above Electrical data subject to Ming Wei power supply with CE certification
3.3 Power Cable Wiring
3.3.1 AC Power
An approved three-pole appliance coupler inside the center door connects to the AC supply. The AC
power cable is then connected to the EMI filter and distributes to the power supply units on left and
right doors. Each door has an earth point for grounding.
DC power from each power supply unit provides low voltage power to the assigned electronics
components, for example, driver board, and fans, the responding color of the wire represents the
relevant component´s power connection, please note the list below for aclear cabling configuration.

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Appendix A: M8 Mechanical Assembly &Wiring Diagram
1. Mechanical Assembly

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2. Wiring Diagram
①handle
②Receive card
③PCB
④Reticle
⑤cable
⑥power supply
⑦The power supply box lock
⑧Black MYLAR sheet
Appendix B： Procedure for IM Replacement,Power Supply, Receiving Card
Procedure for IM Replacement :
1. Power off the panel.
2. Open the relevant panel door and locate the problem IM.
3. Remove all the cabling (from the power connector and data connector) of the problem IM
and take the IM off from the panel; (totally 5screws need to be remove, see the following pictures.)
4. Take out the replacement IM.
①
②
③
④
⑤
⑥
⑦
⑧

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Procedure for Receiving Card replacement：
1. Power off the panel.
2. Find the receiving cards. （see the following picture）
3. Disconnect the four screws.
4. cut off the cable tie fixed the black MYLAR sheet.
5. Replace it with new receiving cards.
Procedure for Power Supply replacement：
1. Power off the panel;
2. Open the relevant panel door and locate the problem Power supply;
3. Disconnect the four screws by M3 sleeve;
4. Disconnect the power supply line of the input and output;
5. Replace it with new power supply.
Cable tie

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Appendix C: Trouble shooting
Failure phenomena
Failure cause
Treatment
LED lamp in IM
(intellectual LED
module)dead, dark,
and long lighting.
Dead and dark Lights 50
are generally the problem of LED lamp; LED long
bright may be caused by IC empty soldering or
internal short circuit.
Replace the IM
Four LEDs in arow are
dark or long bright
IC short soldering or bad pin inserting
Replace the module
Entire IM and the IM
next to it doesn’t
display or display
white
1.The IM with bad circuit
2. Bad Flat signal cable
3. Bad power supply plug on the IM
1.Replace the bad
module
2.Replaced the bad flat
signal cable
3.Replace power supply
plug
Many IMS don’t
display
1.No voltage output for the power supply
2.Bad branch controller
1.Replace the bad
power supply
2.Replace the branch
controller
The whole screen is
blank
1.Main control card is damaged
2. The first branch card has been damaged.
3.IPC don’thave DVI output
4Multifunction card has been damaged
1.Replace the main
controller card
2.Replace the branch
controller
3.Set the DVI output or
replace the bad display
card in the PC;
4.Replace bad
multi-function card
picture is not
consistent in multiple
area of the screen
Wrong Panel address setting or wrong wire
connecting in the Control software
Reset the Panel address
and wire connecting in
the software
exchanged displaying
for multi -IMs
Exchang the connection of the first flat module of
data line
Exchange date line
The screen can not
automatically control
the brightness
1.Multifunction card has been damaged;
2Light sensors have been damaged;
3Control software does not start the automatic
brightness control;
1.Replace the
multifunction board;
2.Replace the light
sensors;
3. Reset to automatic
brightness control in
the software.