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No

Yes

Does POWER LED flicker in red 
(for 2 seconds)?

No

Is there B+3.3V output at pins (12) 
and (13) of CN3701?

Is there 6V output at pins (5) and 
(6) of P2003?

Yes

Go to "Checking of PC I/F Unit", and check 
the flexible connector.
Communication error of sub-microprocessor 
(KEY) and SH microprocessor (PC I/F unit) 
Pins (20) and (21) of P2001.

Yes

Go to "Checking of Power Unit"

Check Q2001 thru Q2004
and IC2001.

No

No

Yes

Is Bu+6.2V signal outputted?"

Go to "Checking of 
Power Unit"

Yes

No

Is Bu+3.3V signal outputted?

Check IC2010 and its 
periphery.

Check IC2010 and its 
periphery.

Yes

No

Is 3.3V signal output at pin 
(19) of IC2001?

Check IC2001 and its 
periphery and go to 
"Checking of Remote Control 
Communication".

Checking of Sub-microprocessor
and Its Periphery

Checking of Low-pass Filter Circuit 

Yes

Is video signal is inputted to pins 
(4), (8) and (12) of IC3851?

Is video signal inputted to pins 
(24), (21) and (17) of IC3851?

Is the video signal inputted to pins 
(8), (17) and (23) of IC8013 
(AD9888) of the PC I/F unit?

No

IC3851 is defective.
If the picture quality is abnormal, check whether 
or not the following voltages are outputted to 
pin (28) of IC3851. 
0.3 V for 480i, 1 V for 720p, 1080i, Check IC301.

Yes

Check Q3851, Q3852 and Q3853 
and their periphery.

No

Is video signal is inputted to pins 
(16), (20) and (24) of IC3001?

Yes

No

The low-pass filter circuit on the 
input PWB is normal. Does the 
picture appear?

Yes

No

Check pins (4), (8) and (12) of 
SC3001.

Normal

Abnormal

Check Q3854 and 
Q3855.

Check the PC I/F unit. 
Check DVI (analog) 
input.

Yes

No

Check the SOG 
circuit or IC8013 
and its periphery.

Check IC8013 
and its periphery.

End

Feed the 480i component signal in INPUT 1.
Select INPUT 1 using the set's key or the remote controller.
Select 480i among the special modes on the user 
menu screen.

Is 480i selected among the special 
modes?

Does the contour of picture 
appear clear.

Confirmation of synchronization. 
Is Y signal including sync signal 
inputted to pin (3) of IC3502?

Is picture outputted?

Is the color normal?

No

Is the signal type set to the 
component?

In case of monitor output, 
disconnect the monitor output 
cable.

Set the monitor output.
Check the monitor output 
equipment and cable.

No

Yes

Yes

No

Yes

Yes

No

Yes

Abnormal

No

Set the signal type.

IC8025 is defective.

Select 480i.

Restored to normal condition

Yes

End

Checking of DTV
 (480i Component Input)

Check IC8016 
(Video decoder).

Go to "Checking of 
Low-pass Filter Circuit"

Check IC3501 and its 
periphery.

Yes

No

Feed the composite video signal to 
INPUT 3. Select INPUT 3 using the 
set's key or the remote controller.

Feed the S-video signal to INPUT 2. 
Select INPUT 2 using the set's key 
or the remote controller. Does the 
picture appear?

Does the picture appear?

Check IC3501 and its peripheral 
circuit.

Is the picture disturbed?

Is the video signal including sync 
signal inputted to pin (3) of SC3001 
on the input PWB?

Yes

Yes

No

No

No

No

Check IC8016 (video decoder) 
of PC board and its periphery. 
Check Q8002.

Yes

Is the video signal including sync 
signal inputted to pin (7) of IC3501 
on the input PWB?

No

Check Q3512 and Q3513 on 
the input PWB.

Yes

Is the color normal?

End

Yes

No

Yes

Yes

No

Checking of Video Input

Check IC8363 and 
IC8025 (CVIC2) and 
their periphery.

Check Q3502 on the 
input PWB.

Is the C signal inputted 
to pin (11) of SC3001?

1

1

Yes

No

Are pin(5) (horizontal) and 
pin(10) (vertical) signals 
inputted to IC8363 on the 
PC I/F unit?