Daewoo DLT - 42U1GMB User manual

Service Manual
LCD TV
CHASSIS : SL-701T
Model : DLT - 42U1GMB
DLT - 42G1LTBD
DLT - 46U1UMB
DLT - 46U1STB
S/M NO. : DSL701TEF0
Dec. 2007

Contents
1.Safety Precaution ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 3
2.Product Specification ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 4
2-1.Product Specification⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 4
2-2.Available Input Signal ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5
3.Block Diagram ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 8
3-1.Signal Block Diagram ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 8
3-2.Power Tree ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 9
4.SERVICE MODE ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 10
4-1.EEPROM initial DATA ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 10
4-2.Description of SERVICE MODE ITEM ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 12
5.Trouble Shooting ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 13
5-1.No Signal⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 13
5-2.When No Sond ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 20
5-3.When Key does not operte ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 20
5-4.Facts you must know when trouble diagnosing or repairing ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 21
6.Schematic ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 22
7.Printed Circuit Board ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 34
8.Mechanical Exploded Diagram ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 35
9.Part List ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 38
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1. Safety Precautions
(1) When moving or laying down a LCD Set, please deal with care. Avoid any impact towards
the LCD Set.
(2) Do not leave a broken LCD Set on for a long time. To prevent any further damages, after
check the broken Set’s condition, make sure to turn the power (AC) off.
(3) When opening the BACK COVER, you must turn off power (AC) to prevent any electric
shock.
(4) When loosening screws, check the connecting position and type of the screw.
Sort out the screws and store them separately
Because screws holding PCBs are working as electric circuit grounding,
make sure to check if any screw is missing when assembling.
(5) A LCD Set contains different kinds of connector cables.
When connecting or disconnecting connector cables, check the direction and position
of the cable beforehand.
(6) When disconnecting connectors unplug the connectors slowly with care.
(7) Connectors are designed so that if the number of pins or the direction does not match,
connectors will not fit.
When having problem in plugging the connectors, make sure to check their kind, position,
and direction.

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2. Product Specification
Features
LCD Panel
TV System
Input
Connector
Output
Connector
Sound
Output
Power
Consumption
Dimension
(W x H x D)
Screen Size
Aspect Ratio
Resolution
Pixel Pitch
RF
Contrast
Ratio
Receiving
System
46” 42”
16 : 9
1800 : 1
DVB-T,
PAL, SECAM,
NTSC(AV)
DVB-T,
PAL, SECAM,
NTSC(AV)
DVB-T,
PAL, SECAM,
NTSC(AV)
DVB-T,
PAL, SECAM,
NTSC(AV)
75 Ohm Coaxial
S-Video 1
SCART 2
75 Ohm Coaxial
1
2
Component RCA X 1
PC RGB D-Sub X 1
PC Audio 3.5mm Mini-Jack
SPDIF Optical-Jack Optical-Jack Optical-Jack Optical-Jack
10W
260W 230W
1114 x 745.5 x
125.5(mm) 1044 x 692 x 125(mm) 1114 x 745.5 x 125.5(mm) 1044 x 692 x 124.9(mm)
Max
Power
Source
Set
Dimension
220 ~ 240V,
50~60Hz 220 ~ 240V, 50~60Hz 220 ~ 240V, 50~60Hz 220 ~ 240V, 50~60Hz
HDMI
RCA X 1
D-Sub X 1
75 Ohm Coaxial 75 Ohm Coaxial
11
22
RCA X 1 RCA X 1
D-Sub X 1 D-Sub X 1
3.5mm Mini-Jack
10W
260W 210W
3.5mm Mini-Jack 3.5mm Mini-Jack
Headphone
RF-out
3.5mm Mini-Jack
1111
3.5mm Mini-Jack 3.5mm Mini-Jack 3.5mm Mini-Jack
10W 10W
1920 x 1080 1920 x 1080
0.17675mm x
0.17675mm
1000 : 1 1800 : 1 1000 : 1
1366 x 768 1366 x 768
0.4845mm x
0.4845mm 0.7455mm x 0.7455mm 0.227mm x 0.681mm x RGB
16 : 9 16 : 9 16 : 9
46” 42”
DLT-46U1UMB DLT-42U1GMB
2222
DLT-42G1LTBDDLT-46U1STB
2-1.PRODUCT SPECIFCATION

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Product Specification
2-2.Available Input Signal
2-2-1.DLT-46U1UMB, DLT-42U1GMB
Resolution
640 x 480
800 x 600
1024 x 768
1280 x 1024
480P
576P
720P
1080i
480i
576i
1920 x 1080i
V-freg
60Hz
HDMI
OOX
75Hz
60Hz
75Hz
60Hz
75Hz
60Hz
60Hz
75Hz
50Hz
50Hz
60Hz
50Hz
60Hz
50Hz
60Hz
60Hz
60Hz
OOX
OOX
OOX
OOX
OOX
OOX
OOX
O
O
O
O
O
X
OO
O
OO
O
OO
O
X
XO
XO
X
O
OOO
OXO
O
X
PC(D-Sub) Component Standard
VESA Standard
VESA Standard
VESA Standard
VESA Standard
VESA Standard
VESA Standard

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Product Specification
2-2-2.DLT-46U1STB, DLT-42G1LTBD
Resolution
640 x 480
800 x 600
1024 x 768
1360 x 768
480P
576P
720P
1080i
480i
576i
V-freg
60Hz
HDMI
OOX
72Hz
60Hz
72Hz
60Hz
70Hz
60Hz
60Hz
50Hz
50Hz
60Hz
50Hz
60Hz
60Hz
50Hz
OOX
OOX
OOX
75Hz OOX
OOX
OOX
OOX
O
O
O
O
O
X
X
OO
X
XO
XO
X
O
OO
OX
X
O
X
X
PC(D-Sub) Component Standard
75Hz OOXVESA Standard
VESA Standard
VESA Standard
VESA Standard
VESA Standard
75Hz OOXVESA Standard

-7-
Product Specification
2-2-3.Available PIP Mode
Main/Sub
TV
AV 1
XXX X X OO
AV 1 XXX X X OO
AV 2 XXX X X OO
XXX X X OO
DVB XXX X X OO
HDMI 1 OOO O O X X
HDMI 1 OOO O O X X
AV 2 AV 3/
S-Video
AV 3/
S-Video
DVB HDMI 1 HDMI 2
TV

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3. Block Diagram
3-1.Signal Block Diagram

-9-
Block Diagram
3-2.Power Tree

-10-
4. SERVICE MODE
Using the Service Remote controller, you can enter service mode directly.
SERVICE REMOCON : R-34SVC(S/N:48B3034SVC)
4-1.EEPROM initial DATA
Key
S1
S2
S3
S4
Name
Heat Run Mode
Volume Test
EDID write
S5 PANEL TEST
S6
S7
S8
PICTURE TEST
Default
0
0
0
300
290
290
Don’t use
Don’t use
CUT OFF R
CUT OFF G
CUT OFF B
DRIVE R
DRIVE G
DRIVE B
Auto Y Clamp
Auto Y Gain
Adjustment
fix
fix
fix
fix
fix
fix
fix
fix
White balance &
EEPROM Erase
Gumi channel map write
Volume 0->32->63->L->R
1.Connect jumper(I2C)
2.Press "S4" key and then, TV set display "EDID WRITE
OK" upper left of screen.
3.If EDID writing is fail, TV set display "EDID Write Error"
upper left of screen.
4.After EDID write, remove jumper
1.Press the "S8" key.
2.Press the "OK" key of user remocon. And then TV set
display " EEPROM CLEARED" upper left of screen.
3.When you turn off/on AC POWER. EEPROM data will
be cleared.
PATTERN: BLACK -> WHITE -> RED -> GREEN -> BLUE
DEMPOL CHANNEL MAP WRITE
PATTERN: BRIGHT MIN -> CEN-> MAX ->
CONTRAST MIN -> CEN -> MAX->
COLOR MIN -> CEN -> MAX
Operating Method
EEPROM Erase
operating method
Details Default
Function
Adjustment