DAEWOO ELECTRONICS DLM-26C2 User manual

Caution
: In this Manual, some parts can be changed for improving. their
performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List)in
Service Information Center.
Service Manual
LCD TV
CHASSIS :
Model :
S/M NO. : DSL223MEF0
SL-223M
DLM-26C2
DLM-26C3
DLM-32C1
DLM-32C2
DLM-32C3
DLM-37C3
DLM-42C1
OCT. 2006

Contents
1. Safety Precautions 3
2. Product Specification 4
2-1. PRODUCT SPECIFICATION 4
2-2. Available Input Signal 6
3. Block Diagram 7
4. Description of Each Block 8
4-1. Block Diagram of Main IC and TP 8
4-2. Overview 9
4-2-1. Composite video, Y/C(S-Video) and SCART(CVBS, RGB) composite video 9
4-2-2. DTV/DVD signal 11
4-2-3. PC(Personal Computer) signal 13
4-2-4. HDMI signal 15
4-2-5. R/G/B PROCESSING(SCART1, TELETEXT R/G/B) 15
4-2-6. Audio signal processing, KEY, and LED 17
4-3. POWER PCB 22
5. SERVICE MODE 25
5-1. Check initial Menu Data 25
5-2. Entering SERVICE MODE 26
6. WHITE BALANCE Adjusting Method 29
7. Main PCBs Trouble Diagnosis 30
7-1. MAIN PCB Trouble Diagnosis 30
7-1-1. Common checking process when “No signal of Noraster” 30
7-1-2. When No Sound 37
7-1-3. When Control Key does not operate 39
7-1-4. When Remote Controller does not operate 40
7-2. POWER PCB 42
8. Trouble Diagnosis 43
8-1. Facts you must know when Diagnosis and Repairing 43
8-2. Typical Symptoms of PCB problem or bad connection 44
9. Structure of LCD Set 45
10. EXPLODED VIEW 47
11. Part List 53
12. Circuit Diagram 67
-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 the 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, turn off the power(AC) to prevent 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 PCB are working as electric circuit GROUNDING,
make sure to check if any screw is missing when assembling.
(5) A LCD Set contain different kind 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
2-1. PRODUCT SPECIFICATION
Features DLM-26C2AMSB DLM-32C2AMSB
LCD Panel Screen Size 26” 32”
Aspect Ratio 16 : 9 16 : 9
Resolution 1366 X 768(WXGA) 1366 X 768(WXGA)
Pixel Pitch 0.4215mm 0.51075
Contrast Ratio 1000 : 1 800 : 1
TV System Receiving System PAL, SECAM PAL, SECAM
Stereo System 2-Carrer/NICAM 2-Carrer/NICAM
Channel Memory 99ch, Auto Preset 99ch, Auto Preset
Input Connector RF 75 Ohm Coaxial 75 Ohm Coaxial
S-Video 1 1
SCART 2 2
Component RCA X 1 RCA X 1
PC RGB D-Sub X 1 D-Sub X 1
PC Audio 3.5mm Mini-Jack 3.5mm Mini-Jack
HDMI 1 1
Output Connector SPDIF Optical-Jack Optical-Jack
Headphone 3.5mm Mini-Jack 3.5mm Mini-Jack
RF-out 1 1
Sound Output 10W 10W
Power Consumption Max. 120W 160W
Power Source 110-240V, 50-60Hz 110-240V, 50-60Hz
Dimension(W X H X D) Set Dimension 812 X 502.7 X 240 944 X 585.5 X 240

Product Specification
-5-
Features DLM-37C3LMBS DLM-42C1LMR
LCD Panel Screen Size 37” 42”
Aspect Ratio 16 : 9 16 : 9
Resolution 1366 X 768(WXGA) 1366 X 768(WXGA)
Pixel Pitch 0.2mm X 0.6mm X RGB
0.227mm X 0.681mm X RGB
Contrast Ratio 800 : 1 550 : 1
TV System Receiving System PAL, SECAM PAL, SECAM
Stereo System 2-Carrer/NICAM 2-Carrer/NICAM
Channel Memory 99ch, Auto Preset 99ch, Auto Preset
Input Connector RF 75 Ohm Coaxial 75 Ohm Coaxial
S-Video 1 1
SCART 2 2
Component RCA X 1 RCA X 1
PC RGB D-Sub X 1 D-Sub X 1
PC Audio 3.5mm Mini-Jack 3.5mm Mini-Jack
HDMI 1 1
Output Connector SPDIF Optical-Jack Optical-Jack
Headphone 3.5mm Mini-Jack 3.5mm Mini-Jack
RF-out 1 1
Sound Output 10W 10W
Power Consumption Max. 200W 220W
Power Source 110-240V, 50-60Hz 110-240V, 50-60Hz
Dimension(W X H X D) Set Dimension 940 X 655 X 129 1060 X 758 X 133

Product Specification
-6-
2-2. Available Input Signal
2-2-1. HDMI/ PC/COMPONENT
2-2-2. VIDEO
- PAL, PAL-M, PAL-N
- NTSC, NTSC4.43
- SECAM
Resolution V-freq HDMI PC(D-Sub) Component Standard
60Hz O O X
640 X 480 72Hz O O X
75Hz O O X VESA Standard
60Hz O O X VESA Standard
800 X 600 72Hz O O X VESA Standard
75Hz O O X
60Hz O O X VESA Standard
1024 X 768 70Hz O O X VESA Standard
75Hz O O X VESA Standard
720 X 480P 60Hz O X O
720 X 576P 50Hz O O O
1280 X 720P 50Hz O X O
60Hz O O O
1920 X 1080i 50Hz O X O
60Hz O O O
720 X 480i 60Hz X X O
720 X 576i 50Hz X X O

-7-
3. Block Diagram

-8-
4. Description of Each Block
4-1. Block Diagram of Main IC and TP

-9-
4-2. Overview
Digital PCB is Multi Media circuit board that can process various input signals such as
video, component, PC, HDMI, and analog TV signal.
4-2-1. Composite video, Y/C(S-Video) and SCART(CVBS, RGB) composite video
- Flow Chart of RF, Video, S-Video Signal
Description of Each Block

-10-
Description of Each Block
Y signal(input to IC505)
Location : CC451
Color signal(input to IC505)
Location : CC456

Description of Each Block
-11-
CVBS signal(input to IC505)
Location : CC455
4-2-2. DTV/DVD signal
Y signal(input to IC505)
Location : CC445

Description of Each Block
-12-
Pb signal(input to IC505)
Location : CC446
Pr signal(input to IC505)
Location : CC447

Description of Each Block
-13-
G signal(input to IC505)
Location : CC452
B signal(input to IC505)
Location : CC453
4-2-3. PC(Personal Computer) signal
R signal(input to IC505)
Location : CC454

Description of Each Block
-14-
Horizontal sync(Output of IC505)
Location : RC458
Vertical sync(Output of IC505)
Location : RC459

Description of Each Block
-15-
4-2-4. HDMI signal
Location : RC465, RC466, RC467, RC468, RC469, RC470, RC471, RC472
4-2-5. R/G/B PROCESSING(SCART1, TELETEXT R/G/B)
R signal (input to IC505)
Location : RC450

Description of Each Block
-16-
G signal(input to IC505)
Location : RC448
B signal(input to IC505)
Location : RC449

Description of Each Block
-17-
4-2-6. Audio signal processing, KEY, and LED
- Flow Chart of Audio signal
COMP-L sound
Location : ZA225

Description of Each Block
-18-
IC602 output
Location : L606, L610
IC602 input
Location : RC685, RC687

-19-
Description of Each Block
Headphone out
Location : RC611, RC612
SIF input
Location : CC654

-20-
Description of Each Block
I2S input
Location : RC622(CLK)
SPDIF out
Location : RC655