Daewoo L32R63 VKE Series Manual

Document: After-sales Maintenance Service Manual No.: L32R63*VKE/L40R63*VKE/L43R63*VKE/L49R63*VKE Version: 1.0 Effective from: APRIL 4th, 2016
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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
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Table of Content
I. Safety and Precautions inMaintenance Process.................................................................................03
II General Electrical Fault Analysis Process.........................................................................................04
III. Simple Troubleshooting..................................................................................................................09
IV. Product Specication.......................................................................................................................10
V. Factory Service Mode.......................................................................................................................12
VI. Circuit Diagram Explanation..........................................................................................................13
VII. Power Module Fault Analysis .......................................................................................................15
VIII. Major Part BOM ..........................................................................................................................18
IX. S/W updating method .....................................................................................................................21
X. Explosive view (32"/40").................................................................................................................24
XI. Explosive view (43") ......................................................................................................................25
XII. Explosive view (49").....................................................................................................................26
XIII. Circuit Diagram (32"/40", 3in1 board) ........................................................................................27
XIV. Circuit Diagram (43", 3in1 board) ...............................................................................................34
XV. Circuit Diagram (49", 3in1 board).................................................................................................42
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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
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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
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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
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.
Check +5V and +12V output from embedded
power supply for abnormity
Check +5V and +12V on main board for
abnormity
Abnormal output voltage +5V and +12V from
embedded power supply, replace embedded
power supply with the same model
Check for open-loop of fuse, or replace main
board
Check main board of power supply for
looseness, open-loop and poor contact
Replace power cord or power socket
YES NO
YES NO
YES NO
Check the fuse on high-voltage board for the
supply of 12V
Replace high-voltage switchboard
YES
YES
2. Without light
Check each triode of control part for abnormity
or replace main board
Check fuse
NO
NO
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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
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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 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.
NO YES
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
Check the interface between main board
and connect line for any looseness,
shedding, if no abnormity existed,
replace LCD screen
YES NO
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
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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)
6. TV without channel or with color cast
Check TV antenna plug for looseness and poor contact
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)
Check the antenna and its signal
source, if no problems exist, replace
tuner or control chips with the same model
Replace antenna plug
NO
YES
Check whether there is change of voltage at the high voltage
board controlled by main board when power-on and power-off
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
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
YES NO
The circuit
related to high
voltage board is
poor
Check relevant
circuits of high voltage
board controlled by
main board
Replace poor main
chips or recopy
software
Check whether the lines
between main board and
high voltage board is in
open-loop or poor contact
YES YESNO NO
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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
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7. Poor sound
Poor sound refers to without sound or with noise; check whether
the selection of sound system is proper
Switch to other audio input, check whether DVD
input and PC main board input has sound
No sound for other inputs; check the sound
amplier and the shared control circuit
No sound; check whether remote control mute is
selected and switch sound system
There is sound for other inputs, replace TV tuner
or control chip
NO
YES
YES
NO
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.
Check VGA signal input board and see whether
the row and eld sync signal protection diode is
broke down
Replace the motherboard or
factory reset is normal
Replace PC or signal line, check
display VGA plug for looseness
Replace the 5.6V Zener diode
on the motherboard
NO
YES
YES
NO
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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
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9. Poor embedded power supply of TV
Power on, check embedded power supply 5VSB in TV for 5V
voltage output
High electrical level existed at
STB (higher than 2.5V)
Check power supply line for looseness, check
indictor for working and power supply socket for
looseness
NOYES
Check +5V,
+12V
for normal input
Fasten lines and
socket
Replace power
supply
Check EC2 for 380-400V
voltage; if there is not,
replace power supply
YES YESNO NO
Replace power supply
NO
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
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III. Simple Troubleshooting
No. Nonconformity Troubleshooting Remar ks
1
Image with snow, noise
in audio
A. Check the antenna plug is loosened or not,
and conrm the cable connection is perfect
or not.
2B. Check the channel is set properly or not; or
reset.
3C. Check the antenna type and select VHF/
UHF.
4
D. Check the antenna orientation and location,
and adjust to the optimum orientation and
angle.
5E. Conrm whether the signal is too weak, and
try to use signal intensier.
6Fine image and audio
with noise Enter TV menu, and re-select the audio system
7
Without display and
noise, and the indicator
light is not on
Check connection of the power cable is ne or
not, and the power socket is electried or not.
8Image with line or strip
and other interferences
Check whether the signal is interfered by
blower, electric warmer and other equipment.
9Double TV image
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 Check the color system or adjust the color
saturation
11 No sound of TV Check whether it is mute, the volume is too
low; check and change the audio system
12
Computer gives no
display, prompting no
signal input with the
indicator light is ashing
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
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IV. Product Specication
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 < 55 W < 75 W < 110 W
Carton Dimension
(W*H*D) 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
Feature
TV PAL(or SECAM), DVB-T2/T/C, VHF~UHF
CVBS PAL/NTSC/SECAM, Video Level 1.0 Vp-p
Power AC 100 ~ 240 V, 50/60 Hz
Input
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)
PC - RGB X 1 : D-Sub 15 Pin terminal
HDMI X 2 : HDMI terminal
USB X 2 : USB slot
Output
Earphone X 1 : Earphone terminal (Optional)
AV Output X 1 : RCA terminal (Optional)
SPDIF X 1 : Coaxial terminal(Optional)
1. Product Spec.
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