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TROUBLESHOOTING

7 – 2

2 POWER ABNORMALITY

*

Power flashing twice + OPC LED flashing
The following chart is OPC LED flashing pattern (1 cycle)

DET_10V error

Flashing Once

H:On

L: Off

DET_D3V3 error

Flashing twice

DET_12V error

Flashing 5 times

H:On

L: Off

H:On

L: Off

H:On

L: Off

Main error

Flashing 7 times

D3.3V does not rise up. Check the circuits 
around the connector PH - IC9602

A9V does not rise up. Check the circuits around 
the connector PH - IC9706.

Are the output 

voltages supplied from 

the power PWB?

No

Flashing 
several sec 

Immediately flashing

Abnormality

Abnormality

No abnormality

Check the inverter power. 
Check for blown fuse.

Check the power 
for signals.

Replace the abnormal parts.

Does the LED 

flashes immediately after 

AC_ON or does it light in blue and 

then flash several 

seconds after?

5V does not rise up. Check the circuits around 
the connector PH - IC9705.

PNL12V is not detected. Check the connector 
LP - PL - PC line. 
Check the fuse in the power interface PWB.

Main microprocessor detection error. For details, 
check the codes of ERROR SRNDBY CAUSE 
on 1/37 (North America) or 1/38 (Europe/China) 
of the process adjustment mode. For the errors 
corresponding to the codes, refer to 
" 

■ MONITOR_ERR_CAUSE LIST"

DET_6V error

Flashing 3 times

H:On

L: Off

TROUBLESHOOTING

7 – 3

3 LAMP ABNORMALITY

*

The backlight does not light up, or lights up instantaneously but turns off soon.

Is each output 

voltage supplied from 

each power PWB?

No

No

Identify 
the PWB 
which is 
not lighted

Yes

Yes

Yes

Yes

Abnormality

Refer to "4 The power is not supplied."

No

No

Replace the abnormal parts.

Lamp OFF check
While pressing [CH_Down] + [VOL_UP] of the main unit, 
forcible rise the power with AC_ON, and look for the 
lighting/preheat PWB whose LED is not lighted. 

Use a tester to check the resistance across the HCFL 
connector of the PWB which is not lighted and identify 
the lamp which is open. (Normally 1.8 - 2.2

Ω). 

Replace the HCFL which is open. 

Is there no abnormality in the main/power interface PWB 
and the related sections?

Is there no abnormality in the cables and the connectors?

Is there no abnormality in the main PWB?

Is the STB signal normal?

Check the connector 

BK - LB line. 

Are the inverter 

control PWB and 

its connector cable normal?

Are each inverter PWB

/preheat PWB and 

their connector cable 

normal? 

TROUBLESHOOTING

7 – 4

4 THE POWER IS NOT SUPPLIED.

Is each output voltage 

supplied from each 

power PWB?

No

Abnormality

Immediately 
flashing

Flashes several seconds 
later, or turns off

No abnormality

No abnormality

No abnormality

Abnormality

Abnormality

Check the inverter power. 
Check for blown fuse.

Does the LED 

flashes immediately after 

AC_ON or does it light in blue and 

then flash several 

seconds after?

Is there no abnormality in the power PWB 
and its related sections?

Is the fuse blown off?
Is there no abnormality in the power PWB?
Is there no abnormality in the switch cable?
Is there no abnormality in the filter block?
Is there no abnormality in the AC power cord?

Is there no abnormality in the main/power interface PWB and 
the related sections?

Is there any abnormality in the connection cable and the connector?

Is there no abnormality in the main PWB?

Is the power SW ON?
Is there any abnormality in the power SW?

Is there any abnormality in the switch/LED PWB and the related 
sections?

Replace 
the abnormal parts.

Replace 
the abnormal parts.

No

Yes

Is the AC power plug inserted properly?

Insert the AC 

plug properly. 

Is there any abnormality in the connection cable and the connector?

Is there any abnormality in the switch/LED PWB?

TROUBLESHOOTING

7 – 5

5 THE DISPLAY IS NOT SHOWN. / DISPLAY ABNORMALITY

6 THE REMOTE CONTROLLER DOES NOT WORK.

Abnormality

No abnormality

Is there any abnormality or setting mistake in the adjust-
ment and setting?

Adjust and set again with the menu.

No

Yes

Does the signal input match the input selection?

Match the input source.

No

Yes

Is the graphic board proper?
Is there no problem in the resolution?

Replace the graphic board, or set the resolution again.

Abnormality

No abnormality

Is there no abnormality in the video input signal?

Replace the abnormal parts.

Is there no abnormality in the video cable?
Is the video signal special? (out of support)

Abnormality

Yes

Is the menu displayed in the signal input state?

No abnormality

Is there no abnormality in the LCD module and its related 
sections?

Is there no abnormality in the connection cables and 
the connectors?
Is there no abnormality in the control PWBs?

Abnormality

Abnormality

Is there no abnormality in the main/power interface PWB 
and the related sections?

Replace the abnormal parts.

Is there no abnormality in the cables and the connectors?
Is there no abnormality in the main PWB?

Is there no abnormality in the main/power interface PWB 
and the related sections?

Is there no abnormality in the cables and the connectors?
Is there no abnormality in the main PWB?

Exhausted

No abnormality

Is the battery of the remote controller exhausted?

Replace the battery.

No abnormality

Abnormality

Abnormality

Is there no abnormality in the main/terminal PWB and 
the related sections?

Replace the abnormal parts.

Is there any abnormality in the switch/LED PWB and 
the related sections?

Is there no abnormality in the connection cables and 
the connectors?
Is there any abnormality in the switch/LED PWB?

Is there no abnormality in the cables and the connectors?
Is there no abnormality in the main/terminal PWB?