Troubleshooting.pdf

4. Troubleshooting

4-1. Troubleshooting

Check the various cable connections irst.

• Check to see if there is a burnt or damaged cable.

• Check to see if there is a disconnected or loose cable connection.

• Check to see if the cables are connected according to the connection diagram.

Check the power input to the Main Board.

4-1

4. Troubleshooting

4-1-1. No Power

Symptom

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.

LAMP off, power indicator

LED red color?

Yes

Check a connection a power cable.

Diagnostics

Does proper DC 13V appear at

pin20 of CN1101?

Change a Assy PCB Power.

Yes

Does proper DC A3.3V

appear at C1040?

Check a IC1011

Change a main PCB ass’y

Yes

Does proper DC 5V, 3.3V, 1.2V appear

at C1015, C1039, C1063?

Check a IC1002, IC1012, IC1006.

Change a main PCB ass’y

Yes

A power is supplied to set?

Caution

Make sure to disconnect the power before working on the SMPS/IP.

4-2

4. Troubleshooting

4-1-2. No Video (Analog PC signal)

Symptom

Audio is normal but no picture is displayed on the screen.

Major

checkpoints

Check the PC source

Check the SEMS01

This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

Power Indicator is off.

Lamp on, no video.

Yes

Diagnostics

Check a PC source and check

the connection of DSUB cable?

Input a analog PC signal and

connected cable(DPMS).

Yes

Does the signal appear at BD3014,

3015, 3016 (R, G, B)?

PC cable. Change a PC cable.

Yes

Does the digital data appear at the

output of LVDS (RA5012~13)?

Check a IC5001.

Change a main PCB ass’y

Yes

Check a LVDS cable?

Replace a lcd panel?

Please, Call to Samsung Co. LTD.

Caution

Make sure to disconnect the power before working on the SMPS/IP.

4-3

4. Troubleshooting

WAVEFORMS

R,G,B Output Signal

4-4

4. Troubleshooting

4-1-3. No Video (HDMI - Digital Signal)

Symptom

Audio is normal but no picture is displayed on the screen.

Major

checkpoints

Check the HDMI source

Check the SEMS01

This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

Power Indicator is off.

Lamp on, no video.

Diagnostics

Yes

Check the connection

of HDMI cable?

Input a HDMI cable.

Yes

Does the digital data appear at

R5055~65?

Check a IC3001.

Change a main PCB ass’y.

Yes

Does the digital data appear at the No

output of LVDS (RA5012~14)?

Check a IC5001.

Change a main PCB ass’y.

Yes

Check the LVDS cable?

Replace the LCD panel?

Please, Contact Tech support

Caution

Make sure to disconnect the power before working on the SMPS/IP.

4-5

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