Daewoo LCD TV Troubleshooting - Software Upgrade - Service Mode

Daewoo LA32L1B1LM - LA37L1B1LM - LA42L1B1LM - LA42L1B1LF

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.

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.
- Check if [SOUND] -> [Speaker] is On.
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.

 Picture of analog program is noisy.

- Check the RF cable connection.
- Check if [Picture] -> [N.R] is ON.
- Change the [Channel] -> [Fine Tune] value.
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.
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 ‘Phase’, ‘Clock’, ‘H.Position’, ‘V.Position’ control.
In spite of 'Auto Setup', picture is not clear in the PC mode.
- Adjust 'Phase' control.

1. When you connect with component, PC (D-Sub), and HDMI, you must check the input resolution of external devices.
2. So if this mode is used at PC mode, the screen can be enlarged.
3. 1600x1200 & 1920x1080P modes are supported only Full HD model.

Closed Caption SPEC
DIGITAL(ATSC) standard inspection pattern :  CC708 SPEC STREAM(release to GUMI factory : 2007.02.02)
The Caption feature doesn’t work in COMPONENT, HDMI, and PC modes.
The availability of captions depends on the program being broadcast.
Caption lables and respective meanings.
Analog (NTSC) : CC1 : 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.
CC2 : The Special Non-Synchronous Use Captions.
This channel carries data that is intended to augment information carried in the program.
CC3 : Secondary Synchronous Caption Service.
Alternate program-related caption data, typically second language captions.
CC4 : Special Non-Synchronous Use Captions.
Similar to CC2.

Digital (ATSC) :
Service 1 : Primary Caption Service This service contains the verbatim, or near-verbatim captions for the primary language being spoken in the accompanying program audio.
Service 2 : Secondary Language Service.
This service contains caption in a secondary language which are translations of the captions in the Primary Caption Service.
The other service sub-channels are not pre-assigned.
It is up to discretion of the individual caption provider to utilize the remaining service channels.
Caption style
Default means to follow the standard set by the broadcaster.
Text Size : This option consists of Default,Small,Standard,and large.
The default is Standard.
Text Font : This option consists of Default,
Font 1~7.You can change the font you want.
Text 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.
BG 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.
BG Opacity : This option consists of Default, Rich, Light, and Transparent. You can change the background opacity of the caption.

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.
Labels : TV-Y, TV-Y7, TV-G, TV-PG, and TV-14, TV-MA, FV, D, L, S, V
TV-Y : All Children. Program is designd to be appropriate for all children.
TV-Y7 : Directed to Older Children.
Program is designed for children age 7 and above.
TV-G : General Audience.
This Program contains material that parents may find suitable to younger children.
TV-PG : Parental Guidance Suggested.
This Program contains material that parents may find.
TV-14 : Parents Strongly Cautioned.
This Program contains some material that many parents wound find unsuitable for children less than 14 years of age.
TV-MA : Mature Audience Only.
This Program is specifically designd to be viewed by adults and therefore may be unsuitable for children under 17.
FV : Fantasy violence / D : Sexually Suggestive Dialog / L : Adult Language /
S : Sexual situation / V : Violence
vi) The Movie ratings
Labels : TV-Y, TV-Y7, TV-G, TV-PG, and TV-14, TV-MA, FV, D, L, S, V
G : General Audiences.All ages admitted.
PG : Parental Guidance Suggested.
Some material may not be suitable for children.
PG-13 : Parents Strongly Cautioned.
Some material may be inappropriate for children under 13.
R : Restricted.
Under 17 requires accompanying parent or adult guardian.
NC-17 : No children 17 and under admitted.
X : Adults only.
NR : Not rated.

To enter SERVICE MODE,
A. Press “<VOL” -> “MUTE” -> “DISPLAY” -> “MUTE” button of remote controller(R-55M15)
B. Press “S9” button of SERVICE REMOTE CONTROLLER.

When “No signal” in RF, AV1, AV2
1) First check if other inputs are not working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern(Using the oscilloscope)
-Main TP(RF) : CC220 near IC401(TOP)
-Main TP(AV1) : CC210 near IC202(TOP)
-Main TP(AV2) : CC212 near IC202(TOP)
=>If all TP signal does not appear, replace MAIN PCB.

When “No signal” in Y/C signal (S-Video)
1) First check if other inputs are not working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern(Using the oscilloscope)
-Main TP(S-Video_Y) : CC211 near IC202(TOP)
-Main TP(S-Video_C) : RC216 near IC202(TOP)
=>If all TP signal does not appear, replace MAIN PCB.

When “No signal” in Y/Pb/Pr signal (Component)
1) First check if other inputs are not working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern(Using the oscilloscope)
-Main TP(COMP_Y) : RC238 near IC401(TOP)
-Main TP(COMP_Pb) : RC237 near IC401(TOP)
-Main TP(COMP_Pr) : RC239 near IC401(TOP)
=> If all signal does not appear, replace MAIN PCB.

No Picture-Digital TV mode

Check the IC path.
Tuner(TU101): LC111, CC156~158, RC104, RC105
STV0374(IC101): RA101~103, RC122
B+: 1V: (Pin10,34,35,42,53,58,68,78,89)
2.5V: (Pin14,18,19,28)
3.3V: (Pin49,67,80)

When “No signal” in PC
1) First check if other inputs are not working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern(Using the oscilloscope)
-Main TP(R signal) : RC239 near IC401(TOP)
-Main TP(G signal) : RC238 near IC202(TOP)
-Main TP(B signal) : RC237 near IC401(TOP)
-Main TP(H-Sync) : RC207 near JK203(TOP)
-Main TP(V-Sync) : RC206 near JK203(TOP)
=>If all TP signal does not appear, replace MAIN PCB.

When “No signal” in HDMI
1) First check if other inputs are not working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern(Using the oscilloscope)
-Main TP(HDMI1_Clock) : PIN35 near IC201(TOP)
=>If all TP signal does not appear, replace MAIN PCB.

LCD PANEL BACK-LIGHT INVERTER CHECK

Pin 14 is Status Output of Back light Inverter.

Normal 3.0V to 5.0V

Abnormal 0V to 0.7V

Software Upgrade Method

This model requires ‘dtv150_main.bin’ binary file and USB memory for upgrade.
2. The upgrade file must be named dtv150_main.bin, and located in root directory in USB memory.
3. Press S9 button in service remote controller, and check the decoder version.
4. And move to ‘Dualboot Enable’ and select ‘On’ by pressing ‘¢∏/¢∫’ button.
5. Escape from service menu by pressing menu button.
6. Insert USB memory to USB slot on Side jack.
7. Turn off and on the TV set, then the TV set will be automatically upgraded.

8. Upgrade time is about 2 minutes and the TV set will automatically restart.
9. Press S9 button in service remote controller, and check the decoder version.