Daewoo DLA-32C7LAB 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. : TSL900AEF0
DLA-32C7LAB
DLA-32C7LABD
DLA-37C7LAB
DLA-37C7LABD
DLA-42C7LAB
DLA-42C7LABD
Dec. 2007
SL-900A

Contents
1. Safety Precaution 3
2. Preliminary Troubleshooting 4
3. Product Specification 5
1) Standard of Product 5
2) Available Input Signal 6
3) Available PIP Mode 6
4) Closed Caption Specification 7
5) V Chip(Parent Control) Specification 8
4. Service Remote Controller 9
1) Key Arrangement 9
2) Service Mode Data 10
5. Block Diagram 12
6. Hardware Troubleshooting : Digital Board 13
7. Hardware Troubleshooting : SMPS 18
1) FEL-3237UL : DLA-32/37C7LABD 18
2) FEL-4247UL : DLA-42C7LABD 20
8. Bill Of Materials 22
1) DLA-32C7LABD 22
9. Software Upgrade Methord 31
1) Flash Upgrade 35
10. Mechanical Development Figure 41
1) DLA-32C7LABD 41
2) DLA-37C7LABD 42
3) DLA-42C7LABD 43
11. Hanger Unit Manual

1. Safety Precaution
-3-
(1) When moving or laying down a LCD Set, at least two people must work together. 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
checking the condition of the broken Set, 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 position and type of the screw. Sort out the screws and
store them separately for reassembling. Because screws holding PCBs are working as
electric circuit grounding, make sure to check if any screw is missing when assembling /
reassembling. Do not leave any screws inside the set.
(5) A LCD Set contains different kinds of connector cables. When connecting or disconnecting
cables, check the direction and position of the cable beforehand.
(6) Connect/disconnect the connectors slowly with care especially FFC (film) cables and FPC
cables. Do not connect or disconnect connectors instantaneously with force, and handle
them carefully for reassembling.
(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, check their kind,
position, and direction.

2. Preliminary Troubleshooting
-4-
1) LCD TV does not response or remote controller does not work.
- Check the power cord to be plugged.
- Check the battery of the remote controller.
2) Sound is discontinuous or broken sometimes.
- Check if [SOUND] -> [AVC] is [ON].
- Set the sound effect into 'F Mono'.
- Set the [SOUND] -> [Digital Volume] into proper value.
- [Digital Volume] is enabled only in digital program.
3) Picture of digital program is sometimes broken and sound is discontinuous.
- Digital program has a little problem because of signal receiving status.
- Check if the RF cable is correctly connected.
- Ask for the broadcasting station if the RF cable connection has no problem.
4) Picture of analog program is noisy.
- Check the RF cable connection.
- Check if [Picture] -> [N.R] is ON.
- Change the [Channel] -> [Fine Tune] value.
5) Sound is not generated in HDMI mode.
- Reconnect HDMI jack.
- DVI signal has no sound. Check the output signal of device to be connected to LCD TV.
- If you want to use DVI-HDMI cable, you should also connect audio cable into the LCD TV.
6) In spite of 'Auto Setup', picture size is not completely adapted to the screen in PC mode.
- Check if the input signal is available.
- Ensure that the desktop has no black area.
- Some errors (picture position problem) will be occurred according to certain video card.
In this case, you should adjust 'Frequency' control.
7) In spite of 'Auto Setup', picture is not clear in the PC mode.
- Adjust 'Phase' control.

3. Product Specification
-5-
1) Standard of Product
Owing to our policy of continuous improvement, specifications may change.
Features DLA-32C7LABD DLA-37C7LABD DLA-42C7LABD
LCD Panel Panel Model
LC320W01-SLA1(A-/M) LC370WX4-SLA1(A-/M)
LC420WX7-SLA1(A-/M)
Screen Size 81.28 cm 93.98 cm 106.68 cm
Aspect Ratio 16:9
Resolution 1366 x 768 (WXGA)
Pixel Pitch
170.25µm X 510.75µm 0.200mm X 0.600mm 0.227mm X 0.681mm
Contrast Ratio 3000 : 1 (MAX)
TV System Receiving NTSC, ATSC
System
LVDS Cable FL-X30SSL-HF
LVDS B+ +12V
Input Connector RF 75 Ohm Coaxial
S-Video / Video 2
Component RCA X 2
PC RGB D-Sub X 1
PC Audio 3.5 mm Mini-Jack
HDMI 1
Output SPDIF Optical- Jack
Connector Headphone X
Monitor - out 1
Sound Output Max. 10W
Power Module Model FEL-3237UL FEL-3237UL FEL-4247UL
Power Max. 120 W 150 W 200 W
Consumption Power Source 100 - 124V~, 50/60Hz
Dimension Set Dimension
806 X 628.5 X 240 940 X 720 X 328.7 1037 X 791 X 329
(W x H x D) (with stand)

Product Specification
-6-
2) Available Input Signal
i) TVMode
ØColor Standard : NTCS, ATSC
ØReception Channel : Ch 2~13 (VHF), Ch 14~69 (UHF), Ch 1, 14~125(Cable)
ØSound Transmission System : FM Mono, 2 Carrier, Dolby Digital
ØIF &Subcarrier :
GPIF : 45.75MHz
GSIF : 41.25MHz
GSound Subcarrier : 4.5MHz, 4.72 MHz
GColor Subcarrier : 3.58MHz
GDTV IF : 44MHz (5.38 MHz)
ii) Multimedia Mode
*Multi Input Resolution Aviable in LCD TV
Resolution V-freq HDMI PC(D-Sub) Component Standard
640 X 480 60Hz O O X VESA Standard
75Hz O O X VESA Standard
800 X 600 60Hz O O X VESA Standard
75Hz O O X VESA Standard
1024 X 768 60Hz O O X VESA Standard
75Hz O O X VESA Standard
1280 X 768 60Hz O X X VESA Standard
75Hz O X X VESA Standard
1280 X 1024 60Hz O O X VESA Standard
75Hz O O X VESA Standard
720 X 480i 60Hz X X O
720 X 480P 60Hz O O O
1280 X 720P 60Hz O O O
1920 X 1080i 60Hz O X O
1920 X 1080p 60Hz O X O
3) Available PIP Mode
MODE ATV DTV VIDEO 1 VIDEO 2 COMP. 1 COMP. 2 HDMI PC
ATVXXXXXXOX
DTV X X OOOOXX
VIDEO 1 X OXXXXOX
VIDEO 2 X OXXXXOX
COMP. 1 X OXXXXOX
COMP. 2 X OXXXXOX
HDMI OXOOOOXX
PC X OXXXXOX

Product Specification
-7-
4) Closed Caption SPEC
i) DIGITAL(ATSC) standard inspection pattern :
CC708 SPEC STREAM(release to GUMI factory : 2007.02.02)
ii) The Caption feature doesn’t work in COMPONENT, HDMI, and PC modes.
iii) The availability of captions depends on the program being broadcast.
iv) Caption lables and respective meanings.
ØAnalog (NTSC) :
GCC1 : The Primary Synchronous Caption Service.
These are captions in the primary language that must be in sync with
the sound, preferably matched to a specific frame.
GCC2 : The Special Non-Synchronous Use Captions.
This channel carries data that is intended to augment information carried
in the program.
GCC3 : Secondary Synchronous Caption Service.
Alternate program-related caption data, typically second language captions.
GCC4 : Special Non-Synchronous Use Captions.
Similar to CC2.
ØDigital (ATSC) :
GService 1 : Primary Caption Service This service contains the verbatim,
or near-verbatim captions for the primary language being spoken
in the accompanying program audio.
GService 2 : Secondary Language Service.
This service contains caption in a secondary language
which are translations of the captions in the Primary Caption Service.
GThe other service sub-channels are not pre-assigned.
It is up to discretion of the individual caption provider to utilize the remaining
service channels.
v) Caption style
ØDefault means to follow the standard set by the broadcaster.
GText Size : This option consists of Default,Small,Standard,and large.
The default is Standard.
GText Font : This option consists of Default,
Font 1~7.You can change the font you want.
GText Color : This option consists of Default, White, Black, Red, Green, Blue, Yellow,
Magenta, and Cyan.
You can change the color of the letter.The default is White.
GBG Color : This option consists of Default, White, Black, Red, Green, Blue, Yellow,
Magenta, and Cyan. You can change the background color of the
caption. The default is Black.
GBG Opacity : This option consists of Default, Rich, Light, and Transparent.
You can change the background opacity of the caption.

Product Specification
-8-
5) V Chip(Parental Control) SPEC
i) The rating doesn't work in PIP/POP mode. Reservse case is the same.
ii) The rating setting is possible only on the menu.
iii) Inital password : 2-2-1-1.
iv) Universal key cord (When user does not know password) : 5-4-2-2.
v) The TV Parental Guidelines.
ØLabels : TV-Y, TV-Y7, TV-G, TV-PG, and TV-14, TV-MA, FV, D, L, S, V
GTV-Y : All Children. Program is designd to be appropriate for all children.
GTV-Y7 : Directed to Older Children.
Program is designd for children age 7 and above.
GTV-G : General Audience.
This Program contains material that parents ma find suitable
to yonger children.
GTV-PG : Parental Guidance Suggested.
This Program contains material that parents may find.
GTV-14 : Parents Strongly Cautioned.
This Program contains some material that many parents wound find
unsuitable for children under 14 years of age.
GTV-MA : Mature Audience Only.
This Program is specifically designd to be viewed by adults and therefore
may be unsuitable for children under 17.
GFV : Fantasy violence / D : Sexually Suggestive Dialog / L : Adult Language /
S : Sexual situation / V : Violence
vi) The Movie ratings
ØLabels : TV-Y, TV-Y7, TV-G, TV-PG, and TV-14, TV-MA, FV, D, L, S, V
GG : General Audiences.All ages admitted.
GPG : Parental Guidance Suggested.
Some material may not be suitable for children.
GPG-13 : Parents Strongly Cautioned.
Some material may be inappropriate for children under 13.
GR : Restricted.
Under 17 requires accomanying parent or adult guardian.
GNC-17 : No children 17 and under admitted.
GX : Adults only.
GNR : Not rated.

4. Service Remote Controller
-9-
1) Key Arrangement

Chset/Gumi
Recall
HEAT-RUN
Language
No Function
No Function
User Reset
Volume
Auto Calibration
Picture
No Function
SVC Menu
Factory Reset

Service Remote Controller
-10-
2) Service Mode Data
To enter SERVICE MODE,
A. Press “<VOL” -> “MUTE” -> “DISPLAY” -> “MUTE” button of remote controller(R-55M15)
B. Press “S9” button of SERVICE REMOTE CONTROLLER.
Content Default Value Description
Pw388_1 Sub Bias 32 For BRIGHTNESS adjustment (All inputs)
Sub Gain 74 For CONTRAST adjustment (All inputs)
Bias R 35 For R BRIGHTNESS adjustment (All inputs)
Bias G 32 For G BRIGHTNESS adjustment (All inputs)
Bias B 32 For B BRIGHTNESS adjustment (All inputs)
Gain R 36 For R CONTRAST adjustment (All inputs)
Gain G 32 For G CONTRAST adjustment (All inputs)
Gain B 52 For B CONTRAST adjustment (All inputs)
Pw338_2 Sub Bias 32 For Bias adjustment of SUB PICTURE(PIP)
Sub Gain 64 For Gain adjustment of SUB PICTURE(PIP)
PwFrontEND_1 R Offset 411
G Offset 408
B Offset 393
R Gain 280
G Gain 269
B Gain 269
Y Offset 435
Pb Offset 534
Pr Offset 544
Y Gain 352
Pb Gain 369
Pr Gain 379
RGB Auto Cal >> Ready
YPrPb Auto Cal >> Ready
PwFrontEnd_2 AV Brt 128
AV Brightness adjustment
AV Cont 128
AV Contrast adjustment
AV Color7.5 IRE On
AV Color adjustment
COMP_SOG_TH 4
Component Sync. Threshold value adjustment
Msp46X0 Sc pScale 0
Prescale adjustment for external input (AV, Component, PC etc.)
Fm pScale 12
FM/AM prescale adjustment
HDMI pScale 32
BBE level control(disable)
BBE Level 30
HDMI prescale adjustment
Mvoice Level 12
Mvoice level control
Audio Delay 15
Sound delay control
Stereo ID 10
Stereo check
Misc DECODER Version : MP 200#-##-##-##
MCU Version: LPP 200#-##-##-##
Tst Ptrn AT >>
Tst Ptrn MA >>
TV Auto Off On
EDID Write Ready
*RGB offset values will be set by
executing “RGB Auto Cal” in
service mode.
*YPbPr offset values will be set by
executing “YPbPr Auto Cal” in
service mode.
*The automatically set offset values
may different from the default
value depend on B/D. However,
the main B/D should be replaced
or contact R&D center in Korea if
the OFFSET values differ more
than 20 from default value.

Service Remote Controller
-11-
Content Default Value Description
Debug Enable Off
Smart ICON Status Off
Smart ICON Enable On
Panel Type 32”, 37”, 42”
Demodulator Master Lock Lock/Unlock
E/Q Lock Lock/Unlock
FEG Lock Lock/Unlock
Sync Lock Lock/Unlock
Mode 8VSB
SNR ##.# dB
IF AGC Level #.####
Pot PER #.####
Error Count #
Post BER #.####
Carrier Offset #
Ch Freq ###.####MHz
Reset Level1>> Resets all data in E2PROM other than HDCP key, EDID, RGB offset
and YPbPr offset of FrontEnd_1.
Level2>> Resets all data in E2PROM other than the exception of Level 1
andPw338B_1.
Factory>> Resets the data of auto search, language setting, time setting, and
the user menu values that could be reset by ‘Initialize’ function in
Feature mode.
DTV MODE MENU

-12-
5. Block Diagram

-13-
6. Hardware Troubleshooting : Digital Board
1) In spite of sound output, the screen is black.
1.1 In case of ATV, DTV, VIDEO and COMPONENT mode.
START
Check the SMPS
and input voltage
IC501 Problem.
Replace the Main PCB
IC501 Problem.
Replace the Main PCB
1) TV mode : Check the path from Pin 9 of TU101 to Pin J1 of IC501
2) Component mode : Check the path from input jack to Pin U2,U3
,V2(COMP1) and R1,R2,T1(COMP2) of IC501
3) Video mode : Check the path from input jack to Pin M3(Video1)
and L3(Video2) of IC501
Perhaps Connector and Cable
Problem.
Replace the Main PCB
Check
the input power of
IC501 is correct
Yes
No
Check
the LVDS connector and cable
is correct
Is the input signal of IC501 normal?
Check
the LVDS signal output of IC501 is correct
(Use RC450~RC459)
No
Yes
No
Yes
No
Yes

-14-
Hardware Troubleshooting : Digital Board
1.2 In case of PC and HDMI mode
START
Check the input resolution
of external device
IC501 Problem.
Replace the Main PCB
IC501 Problem.
Replace the Main PCB
1) PC mode : Check the path from Jack to Pin R3, P2
and N1 of IC501
2) HDMI mode : Check the path from input jack to Pin
B1, A1, B3, A3, B5, A5, B7, A7 and F4 of IC501
Perhaps Connector and Cable
Problem.
Replace the Main PCB
Check
PC/HDMI resolution to
available resolution in
LCD TV
Yes
No
Check
the LVDS connector and cable
is correct
Is the input signal of IC501 normal?
Check
the LVDS signal output of IC501 is correct
(Use RC450~RC459)
No
Yes
No
Check the SMPS and
input voltage
Check
the input power of
IC501 is correct
Yes
No
Yes
No
Yes

-15-
Hardware Troubleshooting : Digital Board
1.3 In case of DTV mode
START
Select Air/Cable in Ant. Set correctly
Check the SMPS and input voltage
IC501 Problem.
Replace the Main PCB
Check the path from
TU101 to IC101
Check
the SNR is over 15dB
The signal quality is poor.
1. Check the ANT or its connection is correct
2. Consult a local installer.
Perhaps Connector and Cable
Problem.
Replace the Main PCB
Check
the “Ant. Set” is correct
in Menu
Yes
No
Check
the LVDS connector and cable
is correct
Check
the LVDS signal output of IC501 is correct
(Use RC450~RC459)
Yes
No
No
Yes
Check
the input power of
IC501 is correct
No
No
IS Lock status "LOCK"
in Service Mode(S9)-Demodulator?
Yes
Check the path from IC201 to IC501
Yes
Does
digital signal input from IC201
to IC501
No
Check the path from IC201 to IC501
Yes
Does
TS signal input from IC101
to IC201
No
Yes
No

-16-
Hardware Troubleshooting : Digital Board
2) In spite of picture display, the sound is not generated.
START
1. Confrim AC connection
2. Confrim Power S/W on
3. Check Video or other PCBs
Check the connection of jack
Does screen appear?
Yes
No
Yes
Is the Sound input Jack
correctly connected?
No
Check the connection of speaker
Yes
Is the speaker correctly
connected?
No
Check the SMPS and input voltage
Yes
Check
the input power of IC702 is normal
(Pin 6, 7, 12, 13)
No
Check the path from IC702 to Speaker
No
Check
the signal output of IC702 is normal
(Pin 2,3,8,9,10,11,16,17)
Yes
Perhaps IC702 problem.
Replace main PCB
No
No
Check
the signal output of IC701 is normal
(Pin 34, 36)
Yes
Perhaps IC701 problem.
Replace main PCB
Digital TV mode : Check the path from IC701 to IC201
HDMI mode : Check the path from IC701 to IC501
Analog TV mode : Check the path from IC701 to TU101
Video, Component mode : Check the path from
each Pin of IC701 to each jack
Check
the input signal of IC701 is
normal
Yes

-17-
LCD PANEL BACKLIGHT INVERTER CHECK
* Pin 14 is Status Output of Backlight Inverter.
Status Output of Pin 14
Normal 3.0V to 5.0V
Abnormal 0V to 0.7V

-18-
7. Hardware Troubleshooting : SMPS
1) FEL-3237UL : DLA-32/37C7LABD
'CHECKING FLOW ABOUT INFERIOR SMPS' (MODEL NAME : FEL-3237UL)
PAGE : 1/2
1. Stand-by 5V is working out.
A. Can you check In-put voltage(DC) of the capacitor(Location No. : C22)?
2. MAIN Out-put voltage is working out but Stand-by 5V is working.
A. Is Power On signal(3.3V) supplied to Base of Q7?
YES
YES 1.1 Checking open and short of Out-put side wire cable.
NO
1.2. Checking open and short of the around parts that was connected IC1(STR-A6252).
(Location No. :R12,ZD1,D5,D7)
1.3. Checking open and short of IC1's each pins.
1.4 Checking open and short of D15 each pins.
NO
1.5. Can you check the Fuse(F1) condition(open and short)?
YES : Checking 1.2 item after changing FUSE. NO : Checking 1.5 item.
1.6. Checking open and short of BD.
YES : Changing BD.
NO : Checking open and short of Z1, LF1, LF2.
A. Can you check that Vcc voltage of IC1 was supplied from DC15V to DC27V?
YES
NO
2.1. Can you check the Q2's condition(open and short)?
YES : Changing Q2. NO : Checking 2.2 item.
2.2. Can you check the ZD7's condition(open and short)?
YES : Checking ZD7. NO : Checking 2.4~2.5 item.
YES 2.3. changing Q7.
NO
B. Can you check the Q7's condition(open and short)?
C. Can you check that Vcc voltage of IC2's No.8pin was supplied from DC10V to DC18V?
NO
2.4. Checking open and short of the around parts that was connected IC2(L6565).
(Location No. :ZD4,ZD6,D3,D4,R50,R8D1,D2)
2.5. Checking open and short of IC1's each pins.
YES 2.6. Checking open and short of MAIN BOARD.
2.7. Checking open and short of MAIN BOARD.

-19-
Hardware Troubleshooting : SMPS
'CHECKING FLOW ABOUT INFERIOR SMPS' (MODEL NAME : FEL-3237UL)
PAGE : 2/2
3. 5V's Out-put voltage is measured too high or low.
A. Checking open and short of IC10,IC5.
B. Checking open and short of R25,R23.
C. Checking open and short of IC1.
4. 5V's Out-put voltage is work with intermittent mode.
A. Is R12's condition good from open and short?
YES : changing R12. NO : Checking 1.2 and 1.3 items.
(Checking open and short of MAIN BOARD if that 1, 2 and 1.3 items are no problem.)
5. Out-put voltage(DC12v, 24v, 15v) is measured too high.
A. Checking open and short of IC9.
B. Checking open and short of R39, R40.
C. Checking open and short of IC4.

-20-
Hardware Troubleshooting : SMPS
2) FEL-4247UL : DLA-42C7LABD
'CHECKING FLOW ABOUT INFERIOR SMPS' (MODEL NAME : FEL-4247UL)
PAGE : 1/2
1. Stand-by 5V is working out.
A. Can you check In-put voltage(DC) of the capacitor(Location No. : C23)?
YES
YES 1.1 Checking open and short of Out-put side wire cable.
NO
1.2. Checking open and short of the around parts that was connected IC3(STR-A6252).
(Location No. : R4, R5, D4, D5, D7)
1.3. Checking open and short of IC3's each pins.
1.4. Checking open and short of 5V's Out-put diode.
(Location No. : D13)
NO
1.5. Can you check the Fuse(F1) condition(open and short)?
YES : Checking 1.2 item after changing FUSE. NO : Checking 1.6 item.
1.6. Checking open and short of BD1, BD2.
YES : Changing BD1, BD2.
NO : Checking open and short of Z1,LF1,LF2 ,C1,C2
A. Can you check that Vcc voltage of IC3 was supplied from DC15V to DC27V?
YES
NO
2.1. Can you check the IC9's condition(open and short)?
YES : Changing IC9. NO : Checking 2.2 item.
2.2. Can check the voltage(AC 400V) of AC rectifying side C23?
YES : Checking 2.5 item.
NO : Checking 2.5 item after checking the conditions(open and short) of the around parts that was
connected IC1. (Location No. :R14,R51,Q1,Q5,D1,D23,D12, IC1)
YES 2.3. changing Q4.
NO
B. Can you check the Q4's condition(open and short)?
C. Can you check that Vcc voltage of IC2's No.12pin was supplied from DC10V to DC12V?
NO
2.4. Can you see the square wave(400mV, 40kH) of Q2's source side when DC 13V was supplied to
IC2's No.12pin from DC POWER SUPPLY?
(CAUTION : Test do it after AC Power Off)
YES : Checking 2.1 item after checking diode's condition(open and short) of MainOut-put side.
(Location No. :D14,D15,D16,D17,D18)
NO : Checking open and short of the around parts that was connected IC2.
(Location No. :Q2,Q3,D9,D10,D19,D20,F2)
YES 2.5. Checking open and short of MAIN BOARD.
2.6. Checking open and short of MAIN BOARD.
2. MAIN Out-put voltage is working out but Stand-by 5V is working.
A. Can you check that it is working normal at Power On after dischanging for 1 minute from Power Off?
YES : It's protection due to out-put short of the moment through worker's carelessness.
NO : Checking 2.1 item.
A. Is Power On signal(3.3V) supplied to Base of Q4?