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

-11-
Description of Each Block
Horizontal sync(input to IC501), LOC : LC204
B signal(input to IC501), LOC : LC206
Vertical sync9input to IC501), LOC : LC203

-12-
Description of Each Block
4-1-6. Sound Output
Speaker Output
4-2. Power PCB
4-2-1. Input Requirements
32” & 37”
42”
Normal Voltage P: AC 220V ~ 240V
M: AC 110V ~ 240V
Normal Frequency 50/60Hz
Input Current < 1.0 Arms at 220 Vac input
Inrush Current 220V 80A peak
Earth Leakage Current 0.5mA MAX(250AC)
Normal Voltage P: AC 220V ~ 240V
M: AC 110V ~ 240V
Normal Frequency 50/60Hz
Input Current <1.5 Arms at 220 Vac input
Inrush Current 220V 80A peak
Earth Leakage Current 0.5mA MAX(250AC)

-13-
Description of Each Block
4-2-2. Output Voltage and Current
32” & 37”
42”
Output Current
Board Output
Voltage
Minimum
Output
Voltage
Ma imum
Output
Voltage MIN NOR MAX
Condition
+15Vdc +13.50Vdc +16.50Vdc 0A 0.5A 1.5A
+24Vdc +22.30Vdc +25.40Vdc 0A 5.0A 5.6A
+12Vdc +11.40Vdc +12.60Vdc 0.2A 1.2A 1.5A
ST+5Vdc +4.75Vdc +5.25Vdc 0A 0.7A 0.9A
ST+5Vdc +4.75Vdc +5.25Vdc 0A 0.7A 0.9A PWR-CTL
OFF
PWR-CTL
ON
DEP
MAXNORMIN
PWR-CTL
OFF
0.9A0.7A0A+5.25Vdc+4.75VdcST+5Vdc
0.9A0.7A0A+5.25Vdc+4.75VdcST+5Vdc
1.5A1.2A0.2A+12.60Vdc+11.40Vdc+12Vdc
9.0A8.0A0A+25.40Vdc+22.30Vdc+24Vdc PWR-CTL
ON
1.5A0.5A0A+16.50Vdc+13.50Vdc+15Vdc
DEP
Condition
Output Current
Ma imum
Output
Voltage
Minimum
Output
Voltage
Output
Voltage
Board

-14-
Description of Each Block
4-2-3 Connectors
A. Panel to Power(CN8,CN3) pin spec B. Power to Main(CN2) pin spec
CN8(32", 37"), CN3(42")
PIN No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Output
+24V
+24V
+24V
+24V
+24V
GND
GND
GND
GND
GND
DIMIMING
INV ON/OFF
P DIMMING
N/C
CN2
PIN No. Output
1+12V
2+12V
3GND
4GND
5+S5V
6GND
7 PWR ON/OFF
8 P DIMMING
9 DIMMING
10 INV ON/OFF
11 GND
12 +15V
13 +15V
14 GND
15 GND

-15-
5. SERVICE MODE
Using the Service Remote controller(R-34SVC), you can enter service mode
directly.
Key Menu Sub Menu Default Vallue Description
S1 Heat Run Mode Full White To enter into Heat Run Mode
S2
Gumi Ch Map Write Gumi Ch Map Write To set Gumi factory channels directly
EDID Write HDMI EDID Writing automatically.
(same function on S4)
To set sound(display in sequence)
Perss S3 key again and again,
S3 Volume Test Volume Min change like this: ‘Volume Min’ -
‘Volume Middle’ - ‘Volume Max’ -
‘Balance L’ - Balance R’
When it is finished,
S4 HDMI EDID WRITE EDID Write...Wait! display like this:
FINISH
HDMI1 EDID Success, HDMI2 EDID Success
S5 Index All On Turn on the all LED of INDEX(Smart Icon)
S6 Panel Test To check the defective pixel of LCD
panel Using
/ buttons, 'Full Red -
Green - Blue - White - Black - Gray'
S7 DEMPOL Ch Map Write To set DEMPOL channels dirctly
CUT OFF_R 0
CUT OFF_G 0
CUT OFF_B 0 To display offset and drive value at
S8 White Balance DRIVE_R 0 mode above
DRIVE_G 0
DRIVE_B 0
S9 MODEL SL-602M/P
Using /buttons, select between
‘SL-601T’ and ‘SL-602P’ and ‘SL-602M’
S10 Select Type PANEL LG-32 Using /buttons, select between
'AUO_26' - 'SAMSUNG_26' - 'LG_32' -
'SAMSUNG_32' - 'LG_37' ' '
' ' ' '
BUYER Daewoo Using /buttons, select between
'Daewoo' and 'IRAN' and 'Newziland' -
'Others' and Indonesia
/

-16-
Does No signal
screen appear?
Is LVDS connection
Correctly connected?
Is the signal
input Jack properly?
Check start
Y Y
Y
Y
Y
Y
Y
N
N
Does input source
(AV device) work?
Is input selection
in the Correct mode?
N
N
Is waveform of CLK
in the Main PCB
Normal?
N
Is a weak
Discharge detected
in the screen?
N
Check the connection
of Jack
(LCD and AV device)
Check AV device
N
Check input mode
Check LVDS connection
Panel & JP502 of Main PCB
Replace Main PCB
and/or Sub PCB
Replace Main PCB
and/or Sub PCB
Check other PCBs
and connectors
1.Check AC connection
2.Check Power S/W ON
3.Check other PCBs
6. Main PCB Trouble Diagnosis
6-1.Main PCB Trouble Diagnosis
6-1-1.Common checking process when “No signal of No raster”
No signal : OSD is work but no images are displying
No raster : OSD as well as images in not working

-17-
Main PCBs Trouble Diagnosis
A.When “No signal”in CVBS(RF, Monitor Out)
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) : CE103
- Main TP(Monitor Out) : RCA12

-18-
Main PCBs Trouble Diagnosis
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) : RCA31
- Main TP(C signal) : RCA30

-19-
Main PCBs Trouble Diagnosis
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(COMP1- Y) : LCA08
- Main TP(COMP1-Pb) : LCA06

-20-
Main PCBs Trouble Diagnosis
- Main TP(COMP1-Pr) : LCA04
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) : LC210