Troubleshooting.pdf

4. Troubleshooting

4-1. Troubleshooting

4-1-1. Previous check

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

4-1-2. 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.

LE19/22B45***

LE26/32B45***

Lamp(Backlight) Off,

power indicator LED on?

Yes

Change the power cable or IP board

Does proper Stand-By DC A5V_PW

and A13V_PW appear?

19”/22” : TP1108, TP1109 (A5V), TP7

(A13V) 26”/32” : TP2004 (A5V)

Change the IP Board

Yes

Does proper Main B12VS_PW, B13V_

PW, B5V_PW appear? 19”/22” : IC1022

Pin #5,6 (B5V), IC1023 Pin #7,8 (B13V)

26”/32” : TP2007,8 (B12VS), TP2020~2

(B13V), TP2013~6 (B5V)

Diagnostics

Yes

Does proper A3.3V_PW appear?

19”/22”: IC1009 Pin #2 (A3.3V)

26”/32”: IC2001 Pin #2 (A3.3V)

Change the Main Board

Yes

Does proper B3.3V_PW, B1.9V_PW,

B1.25V_PW appear?

19”/22”: TP1000 (B3.3V), IC2004 Pin

#2 (B1.9V), TP1001 (B1.25V)

26”/32”: C2607 (B3.3V), IC2004 Pin

#2 (B1.9V), C2105 (B1.25V)

Yes

Does proper PANEL_VCC_PW

appear at LVDS connector Pin #1~5

of T-con b’d?

Yes (26”/32”)

Change the LVDS cable.

Does proper DC B12V appear

at F1 of T-con board?

Change the T-con b’d

Yes (19”/22”)

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

LE19/22B45***

Power

CN1001

Dimming out

A13V

GND

A5V

B3.3V Panel Setting

Pow

IC1022

B5V

Panel

VCC

TP1000

B3.3V

TP1001

B1.25V

IC2004

B1.9V

IC1023

B13V

IC1009

A3.3V

4-3

4. Troubleshooting

LE26/32B45***

B5V_PW GND

GND

B12VS

GND

B5V

GND

B13V B13V

B13V

ANA_DIM_OUT NC

SW_INVERTER PWM_DIM_OUT

SW_POWER

LAMP_DETECT

B3.3V_PW

B1.2V_PW

A1.9V_PW

PANEL_PW

A3.3V_PW

Pin #1~5

4-4

4. Troubleshooting

4-1-3. 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 Arsenal, Check the Chelsea.

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

LE19/22B45***

LE26/32B45***

Power indicator LED is off.

Lamp(Backlight) on, no video

Yes

Check a set

in the ‘Stand-by mode’ or

‘DPMS mode’

Diagnostics

Check the PC source and

check the connection of D-SUB

Input the analog

PC signal properly.

Yes

Does the signal appear

at TP5002, 5003, 5004, 5006, 5008?

Check CN5001, PC cable.

Change the Main Assy

Yes

Does the digital data appear at

Pin #16, 17 (LVDS data clk) of LVDS

connector?

Check IC4010 (SEMS12)

Change the main board.

Yes

Check the LVDS cable?

Check the T-Con B’d?

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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