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Are there signal inputs at 
SC8405, SC8502, SC8404? 
Are voltages applied to EA 
connectors?

Check IC1401,Q1401,Q1402, 
Q1403 and their peripheral 
circuits.

Are there signal outputs at
pins (18) (16) (14) of IC1401?

Are there signal inputs at 
pin(44) and (47) of IC1101, 
IC1102, IC1201, IC1202, 
IC1301 and IC1302?

Check IC1101,IC1201,IC1301   
and their peripheral circuits.

Are there signal outputs at pins 
(17), (19), (21), (28), (30) and 
(32) of IC1101, IC1102, 
IC1201, IC1202, IC1301 and 
IC1302?

If there is no signal input at 
pins (15) and (30) of  
SC1101, SC1102 and 
SC1103, check IC1001, 
IC1004 and their 
peripheral circuits.

If there is no signal input at 
pins (1) and (31) of  SC1101, 
SC1102 and SC1103, check 
the switching circuit and 
amplifier circuit of IC1101, 
IC1201, IC1301, IC1102, 
IC1202, IC1302 and their 
peripheral circuits.

Are there signal inputs at 
SC1101, SC1201 and 
SC1301?

Check IC1558, IC1559, 
IC1551~IC1556 and their 
peripheral circuits.

Check the R, G and B panels.

If there is no signal at EA 
connector or SC8404, SC8405 
and SC8502, go to Checking 
the power unitblock.

If there is no signal at P4302, 
P4303 and P4301, go to 
"Checking the video system". 

Check IC2102, IC2202, 
IC2302 and their peripheral 
circuits.

Check the input, the switching circuit 
of IC461 ~ IC464, and their peripheral 
circuit.

Are there audio signal inputs at pins 
(2) and (23) of IC331?

Check the IC331 control voltage,and
its peripheral circuits.

Are there audio signal outputs at pins 
(1) and (2)  of P301?

Check IC302 and its peripheral 
circuits.

Are there audio signal outputs at pin  
(4)(6) of IC302?

Check IC302 and its peripheral 
circuits, and the SP connectors and 
speakers.

If the voltage at pin (7) of IC302 is not 
as specified, check Q7055, Q7054 
and their peripheral circuits.

There is no voltage output at 
EA connector.

Is EA connector disconnected 
or loose?

Is TF701 broken?

Is R711 broken?

Is AC voltage (85-264V) 
applied across the PA 
connector?

Reconnect the EA connector.

There is a short-circuit along 
the EA output line. Using a 
tester, check the resistance 
between each voltage line and 
the ground.

Replace F791.

Replace.

Replace R711,R713 or 
Q701.

Is the right input selected?

Select the right input with remote 
control.

Are the PC, video and LCP cables as 
specified and properly connected?

With the contrast control at maximum, 
does the image appear?

Use the right cables or reconnect the 
cables.

Readjust the video system.

Is the voltage at SC8502 
connector as specified?

Power circuit faulty.

Hook up a personal computer.

Does the image appear?

Go to "Checking the clock circuit and 
its peripheral circuits".

Is the image as specified?

Check the sync signal circuit and its 
peripheral  circuits.

Is the image's colour as specified?

Check the video circuit and its 
peripheral circuits.

Does the on-screen display function?

Go to "Checking the OSD circuit and 
its peripheral circuits".

Does the remote control function?

Go to "Checking the remote control".

End

Turn on the power switch. Is 
discharging sound heard from 
the lamp?

Is the ballast cooling fan 
running?

Is DC 360V voltage applied 
between PL connector pins?

Is 3.5V or higher voltage 
applied between pins (1) and 
(2) of ballast's D connector?

Is power EA connector 
disconnected?

Check the power circuit.

Is the lamp out of socket?

Reconnect the 
lamp into socket.

Replace the 
lamp.

Reconnect the 
connector into socket.

Check the 
microcomputer circuit.

Replace the ballast.