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Lamp does not light up.

Yes

Yes

Is the cooling fan rotating?

Check the socket

Is the P1701 (22) pin H level?

No

Check the power circuit or the fan 
circuit of the main circuit.

Yes

Is the color wheel rotating sound 
heard?

No

Check around IC9101 circuit, motor 
driver IC and IC9102, 9003.

No

Normal

Abnormal

Is the lamp discharging sound 
heard?

Yes

Yes

Is DC 340V voltage applied across 
the ballast power?

Lamp failure to light up. Go to
"Formatter Unit Troubleshooting".

No

Check the control line P-SAVE. 
Is the level converted at IC8001, 
B5 output, RN4904?

No

Yes

Check the power circuit.

Yes

Check IC8001 and the 
peripheral circuit.

No

Replace the color 
wheel.

Check the 
formatter PWB.

No

Replace the lamp.

No

Yes

Does POWER LED flicker in red ?

Yes

Turn on the power again.

Yes

Is P1701 (9) pin (P CON0) H?

Is the FAN voltage supplied?

No

Is it in the stand-by due to 
an error?

No

This is the failure of 
IC2002.

Yes

FAN_ERROR is being detected.
Check around Q1701 and around 
IC2002 (21) pin.

Yes

No

No

No

Is 13 V outputted to P1701 (17) 
(18) (19) pins?

Go to "Checking of Power Unit"

Check IC1708, IC1710 and 
around these ICs.

Yes

No

Is BU 5 V outputted from 
IC1701?

Yes

Is Bu+6.5V outputted to P1701 
(12) (13) (14) pins?

Check IC1701 and its 
periphery."

Yes

No

Is BU 3.3 V outputted from 
IC1702?

Check IC1702 and its 
periphery.

Check IC1703 and its 
periphery.

Yes

No

Is BU 2.5 V outputted from 
IC1703?

Check IC8001 and the circuit 
around the IC.

Check of IC2002 and around I/O

Checking of SOG Circuit

Measure the (7) pin of IC5012 
with an oscilloscope.

This is the failure of the SOG 
synchronization separator circuit.

Is there the Y signal including sync 
signal?

Measure the (7) pin of IC5010 
with an oscilloscope.

Is the composite synchronized 
signal regenerated at proper timing?

No

Is there output of the (25) pin 
of IC3102?

No

The SOG circuit is normal. 

End.

Yes

Yes

Yes

Check around Q5002.

No

Input the S-Video terminal (Y, C) 
signal to INPUT 3. Select INPUT 3 
with the keys on the main body or 
the remote controller.

Is the signal N358?

Does the picture appear?

Is the picture disturbed?

End.

Is the picture signal inputted to the 
connector TC (5) (7) pins?

Yes

No

No

No

No

Yes

No

In the picture signal inputted to 
IC3105 (43) (44) pins?

Yes

Check the input side PWB .

Check IC3505 and the 
peripheral circuits of the IC.

Yes

Yes

Check of the S-Video terminal input.

Check the Y, C signal 
lines.

Check IC3105 and the 
peripheral circuits of the 
IC.

1

Note
Only in case of N358, the noise reduction 
function of IC3505 is used and the noise is 
reduced, so it is inputted to IC3105 (5), (7).

Feed the composite video signal to 
INPUT 4. Select INPUT 4 using the 
set's key or the remote controller.

Does the picture appear?

Is the picture disturbed?

End.

Is the picture signal inputted to the 
connector TC (9) pin?

Yes

Yes

No

No

Yes

Check the TERMINAL2 PWB.

No

Is the picture signal inputted to the 
(1) pin of IC3105?

Yes

Check the VIDEO-IN signal 
line ofIC3502 and IC3503.

No

Is input coming to IC3104 (1) (3) (5)?

Yes

Check IC3102 peripheral circuits.

No

Is output coming from IC3104 (16) (18) (20)?

Yes

Check IC3104 peripheral circuits.

No

Is the picture signal inputted to IC6004 (43) (48) (54) 
and the synchronized signal inputted to (30) (31)?

Yes

Check around IC3104, IC6001 and IC6002.

No

Is each digital output coming on IC6004 (64) (65) (66) (67)?

Yes

Check IC6004 peripheral circuits.

No

Is output coming from IC8001, DPORT?

Check the formatter PWB.

Yes

Check IC8001 peripheral circuits.

No

Is it N358 signal?

No

Check around IC3501, 3505.

Yes

Is it PAL?

No

Check around IC3504, 3506.

Yes

Is it SECAM?

Check the color system, around IC3105. Others.

No

Check around IC 3105. 
Malfunction of the color 
system is thinkable.

Yes

Checking of Video Input

Check IC3102 peripheral 
circuits.

1

3

No

Yes

Is synchronized signal 
coming to IC3102 (28) (29) 
pins?

2

Note
In case of N358, Y/C separates at IC3505 3 DY/C and inputted 
to IC3105 (5) (7) pins.
In case of PAL system, Y/C separates at IC3506 3 Line COM 
and inputted to (39) (41) of IC3105.
The video is outputted from (21) (22) (23) at color difference 
from IC3105.