Daewoo LM32L1 Series User manual

Service Manual
LCD TV
CHASSIS : SL-602M/P
Model : LM/LP(32/37/42)L1
LM/LP(32/37/42)L1B1M
LM/LP(32/37/42)L2
LM/LP(32/37/42)L2BSM
LM/LP(32/37/42)L2Z
LM/LP(32/37/42)L2BZM
LM/LP(32/37/42)L2K
LM/LP(32/37/42)L2BKM
LM/LP(32/37/42)L2R
LM/LP(32/37/42)L2BRM
S/M NO. : TSL602MEF0
Jan. 2008

Contents
1.Safety Precaution 3
2.Product Specification 4
2-1.Product Specification 4
2-2.Available Input Signal 5
2-2-1.HDMI/PC/COMPONENT 5
2-2-2.VIDEO 5
3.Block Diagram 6
4.Description of Each Block 7
4-1.Overview 7
4-1-1.AV1_CVBS 8
4-1-2.AV2 - S-VIDEO 8
4-1-3.COMPONENT-Y Pb Pr 9
4-1-4.HDMI 10
4-1-5.PC 10
4-1-6.Sound Output 12
4-2.POWER PCB 12
4-2-1.Input Requirements 12
4-2-2.Output Voltage and Current 13
4-2-3.Connectors 14
5.SERVICE MODE 15
6.Main PCB Trouble Diagnosis 16
6-1.Main PCB Trouble Diagnosis 16
6-1-1.Common checking process when “No signal of Noraster” 16
6-1-2.When No Sound 23
6-1-3.When Control Key does not operate 24
6-1-4.When Remote Controller does not operate 25
6-2.POWER PCB 27
7.Trouble Diagnosis 28
7-1.Facts you must know when Diagnosing or Repairing 28
7-2.Typical Symptoms of PCB problem or bad connection 29
8.Exploded View 30
9.Service Part List 36
9-1.BOM 36
9-2.Differential parts list for Panel 43
10.Circuit Diagram 44
-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 Sets 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) Connecotrs 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
Screen Size
Aspect Ratio
Resolution
Pixel Pitch
LCD Panel
TV System
Input
Connector
Output
Connector
Sound Output
Power
Consumption
Dimension(W x H x D) (mm)
32" Model
32"
16 : 9
1366x768(WXGA)
0.170mm x
0.510mm x RGB
37" Model
37"
16 : 9
1366x768(WXGA)
0.200mm x
0.600mmx RGB
42" Model
42"
Panel Name LC320WXN LC370WXN LC420WXN
16 : 9
Contrast Ratio
Receiving
System
Stereo
System
Channel
Memory
RF
S_Video
RCA(602M)
Component
PC RGB
PC Audio
HDMI
Headphone
796 x 563 x 244 927 x 656 x 320 1033 x 714 x 320
Weight(with stand) (kg) 12.5 17 20.5
P: 220~240VAC,50~60Hz P: 220~240VAC,50~60Hz P: 220~240VAC,50~60Hz
M: 110~240VAC,50~60Hz M: 110~240VAC,50~60Hz M: 110~240VAC,50~60Hz
115W 150W 200W
Max
Power
Source
9W 9W 9W
3.5mm Mini-Jack 3.5mm Mini-Jack 3.5mm Mini-Jack
333
3.5mm Mini-Jack 3.5mm Mini-Jack 3.5mm Mini-Jack
D-Sub x 1 D-Sub x 1 D-Sub x 1
RCA x 1 RCA x 1 RCA x 1
2(CVBS)/1(Monitor Out) 2(CVBS)/1(Monitor Out) 2(CVBS)/1(Monitor Out)
SCART(602P) 2(CVBS)/2(RF/Monitor Out) 2(CVBS)/2(RF/Monitor Out) 2(CVBS)/2(RF/Monitor Out)
75 Ohm Coaxial
1
75 Ohm Coaxial
1
75 Ohm Coaxial
1
ANALOG :
0~99CH ANALOG : 0~99CH ANALOG : 0~99CH
FM MONO / 2-
Carrier,NICAM FM MONO / 2- Carrier,NICAM FM MONO / 2- Carrier,NICAM
PAL,SECAM,
NTSC(AV) PAL,SECAM, NTSC(AV) PAL,SECAM, NTSC(AV)
10000 : 1 10000 : 1 10000 : 1
1366x768(WXGA)
0.227mm x
0.681mmx RGB

-5-
Product Specification
2-2.Available Input Signal
2-2-1.HDMI/PC/COMPONENT
2-2-2.VIDEO
Note : '1360(6) x 768' is same with '1280 x 768'(Only different from OSD display)
- PAL, PAL-M, PAL-N
- NTSC, NTSC4.43
- SECAM
Resolution
640 x 480
800 x 600
1024 x 768
1360(6) x 768
(1280 x 768)
720 x 480
720 x 480i
720 x 576i
720 x 576
1280 x 720
1920 x 1080i
V-freg
60Hz
HDMI
OOX
72Hz
75Hz
60Hz
72Hz
75Hz
60Hz
70Hz
75Hz
60Hz
75Hz
60Hz
50Hz
50Hz
60Hz
50Hz
60Hz
60Hz
50Hz
OOX
OOX
OOX
OOX
OOX
OOX
OOX
O
O
O
O
O
O
OO
O
OO
O
OO
X
X
OO
XO
X
XO
X
X
OOX
OOX
X
X
PC(D-Sub) Component Standard
VESA Standard
VESA Standard
VESA Standard
VESA Standard
VESA Standard
VESA Standard

-6-
SL-602P/M Block Diagram
Analog Tuner
Main IC
(CORT Z LIT )
[FLI8541]
K Y
Circuit
R MOCON
Circuit
KEY1
REMOTE
LED
HDMI Switch
[PI3HDMI412-B]
LCD PAN L
Flash Memory
[SST25VF016]
16Mb
Audio
Processor
[STV83x7]
PROM
[M24C02]
SPK_L/R
10W 8
3
Audio AMP.
[TDA7491]
[ST232 CD]
IIC_Tuner
R/G/B
CVBS
L/R
Y/Pb/Pr
CVBS
Y/C
3
3
2
RF Out FB
SC1 S/SW
L/R 2
CVBS
2
L/R Out
2
L/R
2
L/R
2
SC2 S/SW
IIS
Reset
IIC_0
CLK/Data
HDMI_SEL
SIF
3R/G/B
2H/V Sync
Tuner_CVBS
2L/R
Tx/Rx
UART
SPDIF
LVDS
2
KEY2
16bit
IIC
B/L ON
PROM
[M24C32]
x
PROM
[M24C02]
For EDIDFor EDID
For EDIDFor EDID
DDR RAMDDR RAM
256Mb
Monitor out
ï
2
3. Block Diagram
.Block Diagram

-7-
4. Description of Each Block
4-1.Overview
Digital PCB is Multi Media circuit board that can process various input signals such as Video,
Component, PC, HDMI and analog TV signal.

-8-
Description of Each Block
4-1-1. AV1 _CVBS
CVBS signal(input to IC501), LOC : RC508
4-1-2. AV2_S-VIDEO
Y signal(input to IC501), LOC : RCA31
Color signal(input to IC501), LOC : RCA30

-9-
Description of Each Block
4-1-3. COMPONENT_YPbPr
Y signal(input to IC501), LOC : LCA08
Pb signal(input to IC501), LOC : LCA06
Pr signal(input to IC501), LOC : LCA04

-10-
Description of Each Block
4-1-4. HDMI
HDMI signal(input to IC 501), LOC : LC301 ~ LC312
4-1-5. PC
R signal(input to IC501), LOC : LC210
G signal(input to IC501), LOC : LC208