Troubleshooting.pdf

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4. Troubleshooting

4. Troubleshooting

4-1. Troubleshooting

4-1-1. Previous check

1.

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.

2.

4-1

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4. Troubleshooting

4-1-2. 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.

Symptom

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.

-

-

-

-

Major

checkpoints

Lamp(Backlight) Off,

power indicator LED on?

Yes

No

Change the 30P power cable

or IP board

Does proper Stand-By DC

A5V_PW appear at TP2004?

No

Yes

Does proper Main B12VS_PW,

B13V_PW, B5V_PW appear at

TP2007~8, TP2020~2, TP2013~6?

No

Diagnostics

Change the Main Assy

Yes

No

Does proper A3.3V_PW

appear at R2028?

Yes

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

B1.25V_PW appear at

C2607, C2590, C2105?

No

Yes

Does proper PANEL_VCC_PW

appear at LVDS connector Pin #1~5

of T-con b’d?

No

Change the LVDS cable

Yes

No

Does proper DC B12V

appear at F1 of T-con b’d?

Change the T-con b’d

Yes

Check a other function

(No picture part)

Replace a LCD Panel

No

A power is supplied to set?

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

Caution

4-2

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4. Troubleshooting

PANEL_PW

TOP

B1.25V_PW

B1.25V_PW

B3.3V_PW

BOTTOM

A3.3V_PW

4-3

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4. Troubleshooting

4-1-3. No Video (Analog PC signal)

Symptom

-

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

-

-

-

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.

Major

checkpoints

Check a set

in the ‘Stand-by mode’ or

‘DPMS mode’

No

Power indicator LED is off.

Lamp(Backlight) on, no video

Yes

Input the analog

PC signal properly.

No

Check the PC source and

check the connection of D-SUB

Diagnostics

Yes

Check CN5001, PC cable.

Change the Main Assy

Does the signal appear at TP5002,

5003, 5004, 5006, 5008?

No

1

Yes

Does the digital data appear at

Pin #19,20,34,35 (LVDS Data clk)

of LVDS connector?

No

Check IC4010 (Saturn4)

Change the Main Assy

2

Yes

Check the LVDS cable?

Check the T-Con B’d?

Replace the LCD panel?

No

Please, Contact Tech support.

Caution

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

4-4

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4. Troubleshooting

LVDS

BOTTOM

D-SUB

4-5

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