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L43R63 VKE Series

Daewoo L32R63 VKE Series, L40R63 VKE Series, L43R63 VKE Series, L49R63 VKE Series Maintenance Service Manual

Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
After-sales Maintenance
Service Manual
L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
Table of Content
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
I. Safety and Precautions inMaintenance Process
For your safety, please read the following safety rules and precautions:
1. Make sure the working table is well grounded before maintenance, and take sound static prevention measures.
2. Make sure the tools such as soldering iron and screwdriver are in good grounding before maintenance.
3. During the maintenance process, please wear the electrostatic ring to prevent damage to the product by personal static.
4. Clean the work table before maintenance to avoid scratching shell or screen by hard articles.
5. Pay close attention to warning information on the products during maintenance process.
6. Please set up the product in accordance with product instructions.
7. Only use a dry cloth to clean the circuit during maintenance process.
8. Please check the component model before replacing it. Using of unauthorized parts may lead to
harm such as electric shock, re or X-ray radiation.
9. When replacing maim board or bus, make are it is inserted at the proper position and in correct direction, otherwise the LCD screen may be burnt out.
10. When connecting to high-voltage board, make sure the plug is inserted in place; otherwise it may
lead to sparkle or protection on the screen, disabling display on the screen.
11. When replacing main board or at cable, please check whether the main board scheme and
software installed are consistent with the screen model.
12. Do not press the wires when installing parts, especially when you install the shielding shell and
back cover.
13. Do not block the ventilation hole when installing the product.
14. Please restore the locations of all parts, installing status, component models and all parameter
settings to the status before maintenance.
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
II General Electrical Fault Analysis Process
1. No power
Check 220V power supply voltage and the contact of power
socket Check AC (220V) voltage and the contact of CN101 socket.
YES NO
Check +5V and +12V output from embedded
power supply for abnormity
YES
Check +5V and +12V on main board for
abnormity
YES
Check for open-loop of fuse, or replace main
board
Replace power cord or power socket
NO
Abnormal output voltage +5V and +12V from embedded power supply, replace embedded
power supply with the same model
NO
Check main board of power supply for
looseness, open-loop and poor contact
2. Without light
When the indicator is on but there is no display, check remote control for power-off, minimum brightness,
contrast ratio, check high-voltage switchboard controlled by main board for abnormity
YES
Check the fuse on high-voltage board for the
supply of 12V
YES
Replace high-voltage switchboard
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Check each triode of control part for abnormity
or replace main board
Check fuse
NO
NO
Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
3. Protection or without light (refers to the disappearance of image
several seconds after the emergence of image)
The image disappeared immediately after the emergence; check the plug of high-voltage switch board
for striking sparks and poor contact
NO YES
No problems identied, replace high-voltage
board; if the fault remains, check the contact
line of back light of LCD for any damage, and
replace LCD board.
If there is spark striking,
replace high-voltage board
4. White panel
White panel refers to the back light works without visible signal and just show white screen.
Check the voltage of socket for at cable connecting the main board to screen for abnormality
YES NO
Check the interface between main board
and connect line for any looseness,
shedding, if no abnormity existed,
replace LCD screen
Check the power supply chip of
control screen or replace main
board
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
5. White screen after power-off (work normally when power on, but when
power-off or no signal input, the screen shows a white screen)
Check whether there is change of voltage at the high voltage
board controlled by main board when power-on and power-off
YES NO
Check whether the voltage change of the control
pins on the plug interface of high voltage board is
normal when power-on and power-off
YES YESNO NO
The circuit
related to high
voltage board is
poor
Check whether the lines
between main board and
high voltage board is in
open-loop or poor contact
Check whether the voltage of the pin on main
chip controlling the working voltage of high
voltage board is normal when power-on and
power-off
Check relevant
circuits of high voltage
board controlled by
main board
Replace poor main
chips or recopy
software
6. TV without channel or with color cast
Check TV antenna plug for looseness and poor contact
YES
If with color cast, check the setting of
color system under menu; and change
of color system to see whether it is
normal (Usually set to automatic)
NO
Check the antenna and its signal
source, if no problems exist, replace
tuner or control chips with the same model
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Replace antenna plug
Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
7. Poor sound
Poor sound refers to without sound or with noise; check whether
the selection of sound system is proper
YES
Switch to other audio input, check whether DVD
input and PC main board input has sound
NO
No sound for other inputs; check the sound
amplier and the shared control circuit
8. No VGAinput signal
VGA signal input does not respond, the screen prompts “Please input signal”,
check whether PC signal source and signal line is normal.
NO
No sound; check whether remote control mute is
selected and switch sound system
YES
There is sound for other inputs, replace TV tuner
or control chip
YES
Check VGA signal input board and see whether
the row and eld sync signal protection diode is
broke down
NO
Replace the motherboard or
factory reset is normal
Page 7 of 49
NO
Replace PC or signal line, check
display VGA plug for looseness
YES
Replace the 5.6V Zener diode
on the motherboard
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
9. Poor embedded power supply of TV
Power on, check embedded power supply 5VSB in TV for 5V
voltage output
NOYES
High electrical level existed at
STB (higher than 2.5V)
YES YESNO NO
Check +5V,
+12V
for normal input
NO
Replace power supply
Check EC2 for 380-400V
voltage; if there is not,
replace power supply
Check power supply line for looseness, check
indictor for working and power supply socket for
looseness
Fasten lines and
socket
Replace power
supply
10. Common fault of LCD screen
10.1 Bright line or bright belt (BL): constant longitudinal or transverse illuminating line or belt due to
non-conformed connection between IC and glass 10.2 Dark line (DL): constant longitudinal or transverse illuminating line due to non-conformed connection between IC and glass.
10.3 White panel (WP): only light tube illuminates owing to non-conformed drive plate of the LCD,
without any display signal in the display area, and the whole screen is white.
10.4 Screen breaking: (overow of LCD): with damage or invisible damage of the liquid crystal glass,
irregular black defect occurs from liquid crystal body to glass and polarizer, which can not be seen at any image. The overow portion can not form image and does not display.
10.5 Pressing Scrape (PS): after local display area at the front of LCD is heavily pressed, glass of the
pressed portion is not damaged, the liquid crystal body can not display normally, with spot or
block black defect.
10.6 Screen mess: irregular color display arising from damage of driving plate in LCD.
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
III. Simple Troubleshooting
No. Nonconformity Troubleshooting Remar ks
A. Check the antenna plug is loosened or not,
1
and conrm the cable connection is perfect
or not.
2
Image with snow, noise
3
in audio
4
5
Fine image and audio
6
with noise
Without display and
7
noise, and the indicator light is not on
Image with line or strip
8
and other interferences
9 Double TV image
B. Check the channel is set properly or not; or
reset.
C. Check the antenna type and select VHF/
UHF.
D. Check the antenna orientation and location,
and adjust to the optimum orientation and angle.
E. Conrm whether the signal is too weak, and
try to use signal intensier.
Enter TV menu, and re-select the audio system
Check connection of the power cable is ne or not, and the power socket is electried or not.
Check whether the signal is interfered by
blower, electric warmer and other equipment.
Check the antenna orientation, avoid reection
caused by high mountains and buildings, and
use the function of micro-tuning
10 No color of the image
11 No sound of TV
Computer gives no display, prompting no
12
signal input with the
indicator light is ashing
Check the color system or adjust the color saturation
Check whether it is mute, the volume is too
low; check and change the audio system
Check whether the signal wire is loosened or falling off, and reconnect
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
IV. Product Specication
1. Product Spec.
Division 32” 43" 49"
Panel type
DLED
(Wide TFT LCD)
DLED
(Wide TFT LCD)
DLED
(Wide TFT LCD)
Max. Resolution 1366 * 768 (WXGA) 1920 * 1080 (WUXGA) 1920 * 1080 (WUXGA)
Speakers 2 X 6 W(10 Ω) 2 X 8 W(10 Ω) 2 X 8 W(10 Ω)
Max. Power
consumption
Carton Dimension
(W*H*D)
< 55 W < 75 W < 110 W
885 x 514 x 132 1085 x 667 x150 1245 x 760 x163
Net Weight(Kg) 5.5 Kg 10.0 Kg 15.0 Kg
TV PAL(or SECAM), DVB-T2/T/C, VHF~UHF
Feature
CVBS PAL/NTSC/SECAM, Video Level 1.0 Vp-p
Power AC 100 ~ 240 V, 50/60 Hz
TV X 1 : D type Connector 75 Ω
CVBS X 2 : RCA terminal (Component sharing)
Component X 1 : RCA terminal (Y, Pb, Pr), (Mini jack available)
Input
PC - RGB X 1 : D-Sub 15 Pin terminal
Output
HDMI X 2 : HDMI terminal
USB X 2 : USB slot
Earphone X 1 : Earphone terminal (Optional)
AV Output X 1 : RCA terminal (Optional)
SPDIF X 1 : Coaxial terminal(Optional)
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
2. Supported resolution list (Depends on EDID information)
Division resolution
Vertical
Freq.
Component HDMI
PC
(D-sub)
comment
(Hz) Component HDMI PC X X
(D-sub) comment 60 O O O
480i 720 * 480 60 O X X
480P 720 * 480 60 O O O
720P 1280 * 720 60 O O O
1080i 1920 * 1080 60 O O X
1080P 1920 * 1080 60 O O O Full HD
VGA 640 * 480 60 X O O DOS/VESA
SVGA 800 * 600 60 X O O VESA
XGA 1024 * 768 60 X O O VESA
WXGA 1360 * 768 60 X O O
WUXGA 1920 * 1080 60 X O O Full HD
Aspect 16 : 9 16 : 9 16 : 9
3. LED Panel Characteristic
(Several kinds of Panel exibly are used for Mass production)
Division 32” 43" 49"
Luminance of White
(cd/m²)
static contrast ratio 1200 : 1 1200 : 1 1200 : 1
Response time 8 ms 8 ms 8 ms
240 / 200 260 / 220 330 / 280
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
V. Factory Service Mode
1. To enter the factory OSD menu
- Press “Menu” + “8” + “2” + “0” + “2” remote key and enter factory mode.
- Press “Up/Down” button to select the function menu and press “Right/Left”
To enter sub menu or adjust values in the menu.
- Press “Menu” or “Exit” remote key to exit factory sub menu and OSD main menu.
2. Service Hot key function with SVC Remote Controller
R-74S01 (Optional)
Key Function Detail information
S1 Aging mode Enter Aging mode with test pattern
S2 Channel Map (ATS) Factory channel map (ATS tuning)
S3
S4 -
S5 -
S6 -
S7 -
S8 -
S9
S10
-
-
Information Software Version / Panel Information
S11 -
S12
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Factory Reset(shipping) Initialize factory default setting
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
VI. Circuit Diagram Explanation
1. IF demodulator
ATSC/NTSC TUNER
SIF CVBS
AGC
IF
TUNER 12C
VSB/QAM Demodulator
TS 8bit
CLK SYNC. VALID
12C
RESET
Tuner(DTV : ATSC, ISDB-T, DVB-T/T2, ATV : PAL, SECAM, NTSC) receives live TV signal as
picture above. After receiving, this TV signal is converted to IF and passed to Demodulator. This demodulator makes TS(transport Stream) or CVBS(Composite Video) for Decoder.
Usually, this kind of demodulator and Decoder are in the ONE SOC main chipset.
2. MEPG decoder
12C
SPDIF_DTV
NAND Flash
16bit
Local Bus
16bit 16bit
UART O TX
TS 8bit
CLK SYNC. VALID
LVDS
UARTO RX
MPEG DECODER
12C
EEPROM
RESET
TS(Transport Stream) or CVBS(Composite Video) signal are passed to MPEG decoder. These input signal are converted to 16 Bit Digital Video Out signal by decoder and passed to Scaler again. This
front-end decoder effect on overall TV performance.
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
3. Video Signal processor
SPDIF Output (Optical)
DDR RAM X 2
16bit 16bit
Digital Video Out(16bit)
NAND
16bit
Local Bus
MSP RESET
Y1/Pb1/Pr1. Y2/Pb2/Pr2
SCALER
HDMI
PC(RGBHV)
CVBS
12C 12C
From HDMI
32bit
SPDIF_HDMI
LVDS
DISPEN. SDA. SCL
LCD
PANEL
Scaler IC, which is in the main SOC IC, do main video processing works of all external video input signal from RF, CVBS, Component, PC, HDMI, USB. These input video signal through the many kind of digital data manipulating are designed for optimal screen data and sended out as a LVDS(Low Voltage Differential Signal) signal format for TCON(Timing Control) board at LCD panel.
4. Audio Signal processor
SIF
Component1 L/R
Video L/R
HDMI_PC L/R
CVBS
Audio Processor
Sound L/R
12C
SPDIF
PWM
Shutdown
AMP IC
L/R
Audio signal from tuner(SIF) and all external audio input signal like HDMI are passed to audio signal processor, which is in the main SOC chipset. These input audio signal are selected by switching block and digital processed. After data manipulating, these data send to Audio amp IC as a analog format(PWM) or digital audio format(IIS) for speaker output.
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Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
VII. Power Module Fault Analysis
Model : L32R63*VKE, L40R63*VKE
(3in1 board (Power + LED driver + Main))
While checking Standby 5V, 3.3V, and Normal 1,5V, 3.3V, 5V, 12V, Main board must be exchanged if voltage output is not correct at the power check point on board.
PQ112 : #2, 5V StandBy
#3, 5V Normal
U8 : #1, 5V Normal
#2, 1.5V DDR
U114 : #3, 5V StandBy
#2, 3.3V StandBy #4, 3.3V Normal
L204 : 12V Normal, AMP 12V
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