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
-2-

-3-
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.

-4-
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

-5-
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

-6-
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

-8-
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

-11-
SERVICE MODE
S9 Device control 1
S10
40
128
121
121
0
3
off
on
186
126
16
0
0
0
23
178
178
128
0
+2
1
1
SSC ON -> OFF
0
42 INCH : 255
46 INCH :
42 inch : 42
46 inch : 46
42 inch : 32
46 inch : 20
148
C2
Video sub bri
Video sub Cb
Video sub Cr
Video sub hue
Video sub cont
Video YC delay
Pedestal level
Anti alias
PIP Brightness
PIP Contrast
Y/G Clamp
Pb Clamp
Pr Clamp
Y/G Gain
Peaking Threthold
Peaking Pos-Gain
Peaking Neg-Gain
APL
Threshold
Tuner AGC
Cb Offset
Cr Offset
SSC Enable
SSC DATA
Dimming Control
Panel Type
Key Type
Normal Brightness
Normal Control
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
fix
Off
fix
fix
fix
0~255

-12-
S10
S11
S12
Main : Analog upgrade
DVB-T : DVB-T upgrade
Software Upgrade
For debugging mode
I2C Stop
Shipping
fix
SERVICE MODE
4-2. Description of SERVICE MODE ITEM
A. S1(1): Heat-Run Key
B. S2(2): Gumi Channel Map Write
C. S3(3): Volume Test
=> This key can check sound
D. S4(4): EDIE WRITE
=> Using this key, you can update EDID data below method.
1. Connect two jumpers (P502) vertically
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
E. S5(5): PANEL TEST
=> Using this key, you can test problem of PANEL, as confirm white pattern, red
pattern,blue pattern, green pattern
F. S6(6): PICTURE TEST
=> Using this key, you can test brightness, contrast and color.
G. S7(7): DEMPOL CHANNEL MAP WRITE
H. S8(8): EEPROM Erase and White Balance adjustment
=> Using this key, you can erase EEPROM data and adjust White balance.
I. S9(9): Device control
=> This key only use for R&D.
J. S10(10): Option key
=> Using this key, you can adjust SSC, Dimming, Panel Type, Control key and etc.
K. S11(11): I2C STOP key
=> This key only use for R&D.
L. S12(SLEEP): Shipping key
=> Using this key, you can set up at shipping mode.

-13-
5. Trouble Shooting
5-1. No signal : OSD is working but on images are displaying

-14-
A. When “No signal” in RF, SCART1,SCART2,AV3
1) First check if other inputs are working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern (Using the oscilloscope)
-Main TP (RF): CC613 near IC601 (Top)
-Main TP(SCART1): LC019 near JP208 (Top)
-Main TP(SCART2): LC213 near JP207 (Top)
-Main TP(AV3): RC055 near P240
=> If all TP signal does not appear, replace MAIN PCB.
B. When “No Signal” in Y/C signal (S-Video)
1) First check if other inputs are working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern (Using the oscilloscope)
-Main TP(Y signal): RC053 near P240
-Main TP(C signal): RC050 near P240
=> If all TP signal does not appear, replace MAIN PCB.
CVBS signal (CC613, LC019, LC213, RC055)
Y signal (RC053)
Trouble Shooting

-15-
Trouble Shooting
C signal (RC050)
Y signal (RC233)
C. When “No Signal” in Y/Pb/Pr signal (Component)
1) First check if other inputs are working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern (Using the oscilloscope)
-Main TP (COMP_Y): RC233 near JP211 (Top)
-Main TP (COMP_Pb): RC234 near JP211 (Top)
-Main TP (COMP1_Pr): RC235 near JP211 (Top)
=> If all TP signal does not appear, replace MAIN PCB.

-16-
Trouble Shooting
D. When “No Signal” in PC
1) First check if other inputs are working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern (Using the oscilloscope)
-Main TP(R signal): RC629 near IC601(Top)
-Main TP(G signal): RC627 near IC601 (Top)
-Main TP(B signal): RC628 near IC601 (Top)
-Main TP(H-Sync): RC630 near IC601 (Top),
-Main TP(V-Sync): RC640 near IC601 (Top)
=> If all TP signal does not appear, replace MAIN PCB.
Pb signal (RC234)
Pr Signal (RC235)

-17-
Trouble Shooting
1024 X 768, 60Hz
R signal (RC629 near IC601)
G Signal (RC627 near IC601)

-18-
Trouble Shooting
B Signal (RC628 near IC601)
Horizontal sync (RC630 near IC601)
Vertical sync (RC640 near IC601)

-19-
E.When “No Signal” in HDMI
1) First check if other inputs are working
=>If other inputs are not working, replace MAIN
2) Checking waveforms with Color Bar Pattern (Using the oscilloscope)
-Main TP (RC672, RC671, RC670, RC668, RC667, RC666, RC665) near IC601
=> If all TP signal does not appear, replace MAIN PCB.
Trouble Shooting

-20-
Check Start
Does Screen appear?
1.Confirm AC connection
2.Confirm Power S/W ON
3.Check Vi eo or other
PCBs
Is the Soun input Jack
correctlyconnecte ?
Check the connection of ja
Is the Speaker
correctly connecte ?
Check the connection of S
SPEAKER or SOUND CABLE has a
trouble.
Y
N
N
Y
Y
N
Y
Are P622A and P
625A Outputs norm
Perhaps IC009 or IC008
problem. replace main PCB.
N
Trouble Shooting
5-2. When No Sound
5-3. When Key does not operate
42G1 : replace the key PCB.
42/46 U1 : replace the touch botton.