Kortek KT-LL84ULFX-PD User manual

LCD MONITOR
Model : KT-LL84ULFX-PD
Written date: Jun 06, 2015
Composed by: Roy Yeom in KORTEK
SERVICE MANUAL

Service Manual
REV 0.1 2
REVISION HISTORY
REVISION
DATE
NOTE
REV0.1
Jun 06, 2015
1st issued

Service Manual
REV 0.1 3
VERY IMPORTANT!
This Equipment is compatible with RoHS Directive and Lead-Free.
Since the equipment is compatible with RoHS Directive, use components in which the use of specific
chemically noxious substances is restricted; use only designated spare parts when it is necessary to
replace such parts with new parts.
Use lead-free solder for the equipment compatible with ones with substrates on which lead-free
components are mounted. For the details, refer to “Caution for Lead-Free Soldering Work” given in the next
page.
1. Safety guideline in servicing
1) Never touch the portions with the marking ( ).
Serious injury or even death may result.
2) Do not expose the set to rain or water.
A risk of fire or electric shock can result.
3) Use an adequate power cord.
A risk of fire or electric shock can result.
4) Do not attempt to service or modify the set without prior permission of the manufacturer.
A risk of fire or electric shock can result.
5) Leave the maintenance service to a service engineer having qualification, knowledge
and experience.
A risk of electric shock, injury or fire can result.
6) Always employ genuine parts indicated in the service manual for replacement.
A risk of fire or electric shock can result.
7) Confirm the connection of the power supply connector earth cable in reassembling.
(Soldering or Screw fixation)
A risk of fire or electric shock can result.
8) Use the specified binding bands, clampers, tubes and barriers--all of which are
necessary for insulation/protection--in their original positions in reassembling.
A risk of fire or electric shock can result.
9) Other complete parts are returned to an appropriate position.
2. Other cautions necessary
1) When removing the cables from their connectors, take care not to damage the wire portions so as
to prevent the occurrence of poor contact.
2) When attaching/detaching screws, use a screwdriver that is well-fit to the screw size.

Service Manual
REV 0.1 4
Procedure of monitor repair-1 (Replacement of defective parts)
3. REPLACEMENT
Yes
Appearance parts
or No (NPF)
Adjustment of monitor
Repair completion
Confirmation
of monitor
version(Serial No.)
Confirmation
of defective parts
Replacement
of defective parts
Were A/D B/D
replacement ?
Was other parts
replacement ?
Inspection of monitor
1. SERIAL NUMBER INFORMATION
2. TROUBLE SHOOTING
Electric parts
Yes
5. INSPECTION PROCEDURES
What are replacement
parts?

Service Manual
REV 0.1 5
Procedure of monitor repai r-2 (New firmware updating)
2. SELECTING PROGRAM FOR FIRMWARE-UPLOADING
1. SERIAL NUMBER INFORMATION
What are uploading
parts?
Old Firmware
A/D BOARD
(SCALER)
Latest
Firmware
* For the detail, see the
separate description
Confirmation
of monitor
version(Serial No.)
Inspection of monitor
5. INSPECTION PROCEDURES
4. CALIBRATION and ADJUSTMENT
Update according to
procedure of uploading
for A/D-B/D
3. FIRMWARE UPDATING
Adjustment of monitor
(FACTORY RESET on
MENU)
Repair completion

Service Manual
REV 0.1 6
Contents
1. PRODUCT INFOMATIONS.......................................................................................................................... 8
1.1 Serial Number Information ............................................................................................................. 8
1.2 Product specification...................................................................................................................... 9
1.3 Overall blockdiagram for the panel ............................................................................................. 10
1.4 Input-Signal Timing(VESA)............................................................................................................11
2. TROUBLE SHOOTING.............................................................................................................................. 12
2.1 No Power........................................................................................................................................ 14
2.2 No Video (LED for Power indicator: Green)................................................................................ 16
2.3 No Video at DP input (LED for Power indicator: Green)............................................................ 19
2.4 No Video at HDMI1 input (LED for Power indicator: Green) ..................................................... 20
2.5 No Video at HDMI2 input (LED for Power indicator: Green) ..................................................... 21
2.6 No Video at DVI input (LED for Power indicator: Green)........................................................... 22
2.7 No Video at VGA input (LED for Power indicator: Green)......................................................... 23
2.8 No Speaker-out from internal-speakers...................................................................................... 24
2.9 The fault of Remote control.......................................................................................................... 25
2.10 The fault of Key control pad......................................................................................................... 26
2.11 Image overlap, focus or flicker .................................................................................................... 27
2.12 Brightness defect .......................................................................................................................... 28
2.13 Line defect / Block defect ............................................................................................................. 29
2.14 Partially color / Brightness uneven ............................................................................................. 29
2.15 Dot defect (Bright dot / Dark dot)................................................................................................. 30
3. DISASSEMBLY.......................................................................................................................................... 31
3.1 Rear-Cover Disassembly.............................................................................................................. 31
3.2 Front disassembly......................................................................................................................... 33
4. REPAIR/CHANGE ACCORDING TO THE FAILED PARTS ...................................................................... 34
4.1 Repair/Change for A/D-Board....................................................................................................... 34
4.2 Repair/Change for OSD Key Board ............................................................................................. 35
4.3 Repair/Change for SMPS.............................................................................................................. 37
4.4 Repair/Change for Speaker unit (Only for Kortek)..................................................................... 38
5. RS-232....................................................................................................................................................... 39
5.1 RS-232 Connection........................................................................................................................ 39
5.2 Serial Command List..................................................................................................................... 40
5.3 Command Format.......................................................................................................................... 40
6. FIRMWARE UPDATE................................................................................................................................ 42
6.1 Uploading the firmware for A/D board......................................................................................... 42
7. CONNECTION OF THE INTERNAL CABLES........................................................................................... 45

Service Manual
REV 0.1 7
8. SETTING(On Screen Display)................................................................................................................... 58
8.1 Shipment-Setting........................................................................................................................... 58
8.2 OSD Control Items in FACTORY- MENU..................................................................................... 58
9. INSPECTION............................................................................................................................................. 59
9.1 Electric Performance Inspection ................................................................................................. 59
9.2 Check for the received recommended frequency...................................................................... 59
9.3 Check the performance................................................................................................................. 59
9.4 Inspection for Audio function ...................................................................................................... 59
9.5 External Inspection on the LCD Module ..................................................................................... 59
10. DIMENSION/PACKING & PALLETIZATION.......................................................................................... 63
10.1 Dimension ...................................................................................................................................... 63
10.2 Packaging....................................................................................................................................... 64
10.3 Palletization.................................................................................................................................... 65
11. LABEL..................................................................................................................................................... 66
11.1 Label Design .................................................................................................................................. 66
11.2 Label Location ............................................................................................................................... 66
12. BOM(Bill Of Materials)............................................................................................................................ 67

Service Manual
REV 0.1 8
1. PRODUCT INFOMATIONS
1.1 Serial Number Information
1.1.1 Model number :
Refer to the serial number information shown below.
EX.) SERIAL NUMBER LABEL
Digit
Meaning
Example above
1~2
Year
14
3~4
Month
10
5~9
Number
04101
Example Serial number is : 141004101

Service Manual
REV 0.1 9
1.2 Product specification
Item
Specification
LCD Module
Pixel Pitch
0.4845 mm x 0.4845 mm
Resolution
3,840 x 2,160 dots
Color
1.06 Billion Colors
Brightness
Min 220 cd/m2, Typ 250 cd/m2
Contrast ratio
Min 750
Viewing Angle
H:178°/ V:178°(CR >10)
Viewable Size
1860.48 mm x 1046.52 mm (16:9 ratio)
Power Management
Yes (Power Save mode)
Plug and Play
Yes / VESA
Auto Adjustment
N/A
Controllable Function
Brightness / Contrast / Color control / etc.
Input
Signal
Video-Input
DisplayPort , HDMI1 , HDMI2 , DVI-D , VGA ,
Audio-Input
HDMI1, HDMI2, DisplayPort, DVI&VGA (Thru 3.5 Phi Stereo ),
Output
Signal
Audio-output
3.5 Phi Stereo-output
Speaker-output
Internal Speaker 10W+10W (8 ohm)
Firm ware Update
A-Type USB (USB2.0)
Control
Built-in Keypad , IR Remote Controller , RS232 In
Power Consumption @ 25degC
Max 500W
Power Consumption (Standby mode)
ECO : 0.5W , Normal : 2W
Power Supply
AC 100V-240V~, 50/60 Hz, 5 Amps(AC 100V) ~ 2 Amps(AC 240V)
Operational
Environmental
Temperature
0 ~ 40°C(temperature range for usage)
5 ~ 25°C(temperature range for Maximum brightness )
"For longer life operating LCD monitor at ambient (25C) is recommended."
Humidity
20 - 85% (without condensation)
Storage
Environment
Temperature(1)
-20 - 60°C
Humidity
10 - 90% (without condensation)
Dimension
Monitor
1910.0 (W) x 1102.0 (H) x 90.5 (D) mm
Shipping
2120 (W) x 1397 (H) x 340 (D) mm (Size packaged in Box and palette)
Weight
Monitor
68 kg
Shipping
98 kg
Wall Mounting Hole
600mm x 600mm VESA (screw M8 (Depth max 35mm))
Tilt/Swivel/Rotation
No
Complied Regulatory
* Safety: UL/cUL, CB, KC(자율안전)
* EMC : FCC, CE, KC(적합등록), -> EMI Level : Class A

Service Manual
REV 0.1 10
* License: HDMI, HDCP
Recommendation
-20C to +60C" Prior to operation, LCD must obtain operating temp. before powering up.
Recommend 1 day stabilization time for extreme temperature conditions
1.3 Overall blockdiagram for the panel
FRC
MST7410
VBY1 41pVBY1 51p
SCALER
MST9849
DDR-III
DDR-III
DDR-III DDR-III
HDMI
S/W
Sil9587-3
FLASH
Audio AMP
PAM8006A
SMW200-15
W200 Main power
SMW200-02
SMW200-10
W702 IR & OSD key
USB(F/W update)
USB Touch
Audio IN L/R
Audio OUT L/R
DP IN
HDMI IN
DVI IN
HDMI
HDMI
Audio OUT L/R
LVDS(DUAL)
IR & OSD KEY
VBY1VBY1
USB F/W Update
HDMIUSB-B
J701
F/W
update
J1105
Touch
USB-B
J105
Audio IN
Power
STB3.3V
TCON 12V
Audio 12V
A/D Main Board
LCD Panel VBY1
3840x2160(UHD)
K84 Block Diagram (ver1.0)
2014.06.01
USB-A Display
Port
J1103
Display
Port
J1107
HDMI1
IN
DVI
J1102
DVI IN
VGA
J1104
RGB IN
Stereo
Jack
W205 SUB BLU/DIM
SMW250- 03
W803
SPK-L
SMW250- 02
W804
SPK-R
SPKout-L
SPKout-R
VGA IN
Audio IN L/R
VGA IN(R,G,B,H,V)
Stereo
Jack
DP to HDMI
PS171
DRV632P
J801
Audio
OUT
Audio OUT L/R
Audio return OUT L/R
HDMI
HDMI IN
J1101
HDMI2
IN
SMW200- 03 W1102 IR
USB-A
J1106 Touch USB
SMW250-04
W203
Panel 12Vout
(UHD65 전용)
Stereo
Jack
SP3222
J1109
RS-232
RS232
UART
12505WR-05
OSD Key
12505
WR-03
IR receiver
(internal)
SMW200-
03
W701
F/W update
TSH343 74125
H,V R,G,B
FLASH
F/W
update
E2PRO
M
FLASH
10W 8Ω10W 8Ω
AFO IR Touch