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.

Check the Power input to the FRC(Frame Rate Conversion) Board.

Check internal Pattern both of FRC and FBE3 if there is some picture noise.

FRC: Factory mode(Info - MENU - MUTE - power on) -> Control ->Test Pattern -> FRC PATT_BeforeDDR / FRC

PATT_AfterDDR -> Press right button of Remocon.

FBE: Factory mode(Info - MENU - MUTE - power on_ ->Control -> Test Pattern -> FBE Pattern Sel ->

Press right button of Remocon.

Case1: FBE ok,FRC NG: change the FRC Board Case2: FBE NG: change the main Board

Check the LED lamp for source button on front

If this LED blank 100mS frequently then FRC board is defective(communication problem via Main board)

in this case change the FRC 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.

2 3

LAMP off, power indicator

LED red color?

Yes

Check a connection a power cable.

Diagnostics

Does proper DC 13V appear at

pin21,22 of CN801?

Change a Assy PCB Power.

Yes

Does proper DC A3.3V appear at

C1131_NACH, C1132_NACH?

Check a IC1103_NACH.

Change a main PCB ass’y

Yes

Does proper DC 5V, 3.3V,

1.25V(B1.2VD), 1.5V, 1.8V(MT_DDRV)

appear at C1140, C1169,

C1163, C1167, C1174?

Check a IC1108, IC1107, IC1109

Change a main PCB ass’y

Yes

A power is supplied to set?

Check a other function.

(No picture part)

Replace a lcd panel.

Caution

Make sure to disconnect the power before working on the IP board.

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 IC6001(SDP84)

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

Input a analog PC signal and

connected cable(DPMS).

Check a PC source and check

the connection of DSUB cable?

Yes

Does the signal appear at

R3012,R3011,R3009(R,G,B)?

PC cable. Change a PC

cable. Change a main PCB ass’y.

Yes

Does the digital data appear at the

output of LVDS (TP7025~TP7038 ,

TP7040~TP7053)?

Check a IC7001

Change a main PCB ass’y

Yes

Check a LVDS cable?

Replace a lcd panel?

Please, Contact Tech support.

Caution

Make sure to disconnect the power before working on the IP board.

4-3

4. Troubleshooting

WAVEFORMS

R,G,B, H_sync input signal of IC6001(SDP84)

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 IC3013

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

RA3668~RA3671 around IC3013?

Check a IC3013

Change a main PCB ass’y.

Yes

Does the digital data appear at output

of LVDS (TP7025~TP7038 ,

TP7040~TP7053)?

Check a IC7001

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 IP board.

4-5

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