Samsung LCD TVs LE32A43*T**, LE37A43*T**, LE40A43*T** How to disassemble, How to troubleshoot

Samsung Chassis: GTN32SE*, GTN37SE*, GTN40SE* LE37A43** series LCD TVs - Service mode, fault finding, alignments, disassembly, white balance adjustment, color alignments

Disassembly

Place monitor face down on cushioned table.
Remove the screws from the Stand.
Remove stand.

Lift up rear cover and remove the stand.

Remove Screw from the stand BRKT and lift up the stand BRKT

Disconnect cable from the boards.

Remove the screws of Main Board and SMPS

Remove screws and lift up the BRKT from the front cover. And then take the panel off.

Reassembly procedures are in the reverse order of disassembly procedures.

Troubleshooting No Power

The LEDs on the front panel do not work when connecting the power cord.
The SMPS relay does not work when connecting the power cord.
The units appears to be dead

 Major checkpoints

The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are
improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
Check the internal cable connection status inside the unit.
Check the fuses of each part.
Check the output voltage of SMPS.
Replace the Main Board.

No Video (Analog PC signal)

Audio is normal but no picture is displayed on the screen

Check the PC source
Check the SEMS01
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

No Video (HDMI - Digital Signal)

Audio is normal but no picture is displayed on the screen

Check the HDMI source
Check the SEMS01
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

No Video (Tuner_CVBS)

Audio is normal but no picture is displayed on the screen

Check the Tuner CVBS source
Check the SEMS01
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

No Picture (S-VIDEO_Y,C)

Audio is normal but no picture is displayed on the screen

Check the S-Video_Y,C source
Check the SEMS01
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

Audio circuit is normal but no sound output

Check the RF Source
Check the SEMS01
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

Wiring details

Alignments and Adjustments

Usually, a color LCD-TV needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync.
Use the specified test equipment or its equivalent.
Correct impedance matching is essential.
Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test result.
Connect the TV only to an AC power source with voltage and frequency as specified on the back cover nameplate.
Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.
To protect against shock hazard, use an isolation transformer.

Entering Factory Mode

To enter ‘Service Mode’ Press the remote -control keys in this sequence:

The buttons are active in the service mode.
1. Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left
Arrow Right, Menu, Enter, Number Key(0~9)
2. Function - Control Key : Power, CH +, CH -, VOL +, VOL -,Menu, TV/VIDEO(Enter)

Panel Check

You have to check Panel Maker Because of different adjustments as follows.
First of all, check the label rating

Label Rating File
- LCD PANEL MARK
A:ACER(AUO),S : SEC, C : CMO
* If not printed you could consider S(sec) panel mark.

Factory Data

Option Table (Service)
WB Adjust
Information

Checksum
T-CRL32PEUMD-XXXX (Main Micom Ver.)
T_NHBTEDEUC-xxxx (DTV MICOM Ver.)
EDID: L12_1366_768 Success
HDCP Success
Month/Day/Year Hour/Min./Sec.

Advanced Menu

Color Calibration
Adjust spec.
1. Source: HDMI
2. Setting Mode: 1280*720@60Hz
3. Pattern: Pattern #24 (Chess Pattern)

Use Equipment: CA210 & Master MSPG925 Generator

Use other equipment only after comparing the result with that of the Master equipment.

Method of Color Calibration (AV)

1) Apply the NTSC Lattice (N0. 3) pattern signal to the AV IN 1 port
2) Press the Source key to switch to “AV1” mode
3) Enter Service mode
4) Select the “Calibration” menu
5) Select the “AV Calibration” menu.
6) In “AV Calibration Off” status, press the “ ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “AV Calibration” status from Failure to Success.

Method of Color Calibration (Component)

1) Apply the 720p Lattice (N0. 6) pattern signal to the Component IN 1 port
2) Press the Source key to switch to “Component1” mode
3) Enter Service mode
4) Select the “Calibration” menu
5) Select the “Comp Calibration” menu.
6) In “Comp Calibration Off” status, press the > key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “Comp Calibration” status from Failure to Success.

Method of Color Calibration (PC)

1) Apply the VESA XGA Lattice (N0. 21) pattern signal to the PC IN port
2) Press the Source key to switch to “PC” mode
3) Enter Service mode
4) Select the “Calibration” menu
5) Select the “PC Calibration” menu.
6) In “PC Calibration Off” status, press the >key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “PC Calibration” status from Failure to Success

Method of Color Calibration (HDMI)

Apply the 720p Lattice (N0. 6) pattern signal to the HDMI1/DVI IN port
2) Press the Source key to switch to “HDMI1” mode
3) Enter Service mode
4) Select the “Calibration” menu
5) Select the “HDMI Calibration” menu.
6) In “HDMI Calibration Off” status, press the > key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “HDMI Calibration” status from Failure to Success.

White Ratio (Balance) Adjustment

You can adjust the white ratio in factory mode (1: Calibration, 3:White-Balance)

The optimal values for each mode are configured by default. (Refer to Table)
It varies with Panel’s size and Specification.

Equipment : CS-210
- Pattern: MIK K-7256 #92 “Flat W/B Pattern” as standard
- Use other equipment only after comparing the result with
that of the Master equipment.
- Set Aging time : 60min

Calibration and Manual setting for WB adjustment.

HDMI : Time #6 720P, Pattern #24 Chessboard Calibration === Manual adjustment #92 pattern (720p)
COMP: Time #6 720P, Pattern #24 Chessboard Calibration ===Manual adjustment at #92 pattern (720p)
CVBS: Time #2 PAL, Pattern #24 Chessboard Calibration === Manual adjustment at #92 pattern (NTSC)
PC: Time #21 1024*768, Pattern #24 Chessboard Calibration === Manual adjustment at #92 pattern (NTSC)
- If finishing in HDMI mode, adjustment coordinate is almost same in AV/COMP mode.
- White Balance Manual Adjustment

How to Access Service Mode after S/W Upgrade

Entering Factory Mode

<Power OFF> → <INFO> → <MENU> → <MUTE> → <Power ON>

Factory Data

Option Table(Service)
WB Adjust
Information
Advanced Menu
If you want to enter here, press “0000”.

How to Initialize

Click “1. Option Table(Service)” → “Factory Reset” in Factory Menu.
You can make every setting in Factory Initial Status.