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LC-40/46/52LE820E, LC-40/46LU820E

7 – 9

                                            
Is a CVBS signal input to pin (3) of EXT8 (J505)?

NO

Check the setting of an external input device that connects with 
EXT2.

YES

Is CVBS signal sent to pin (AE29/CVBS_IN) of IC3302?

NO

Check the line between J505 and IC3302.

YES

Refer to “The picture doesn't appear in all modes.”

                                            
Is it selected “Component” by the Audio setup under Menu-
Setup-Option-Input terminal setting - Input select?

NO

Set the “Component”.

YES

Is a COMPONENT video signal input to pins (1)/PC_R_COM, 
(2)/PC_G_COM, (3)/PC_B_COM of EXT3 (SC501)?

NO

Check the setting of an external input device that connects with 
EXT3.

YES

Is COMPONENT signal sent to pins (AJ17/PC_R_CM), (AJ16/
PC_G_CM) and (AJ15/PC_B_CM) of IC3302?

NO

Check the line between SC501 and IC3302.

YES

Refer to “The picture doesn't appear in all modes.”

                                            
Is it selected “PC (RGB)” by the Audio setup under Menu-Setup-
Option-Input terminal setting - Input select?

NO

Set the “PC (RGB)”.

YES

Are the video signal and the synchronized signal input from pin 
(1, 2, 3)/(PC_R, G, B), (14 and 13)/(V, H.Sync) of EXT4 (SC501)?

NO

Check the connection and setup with the external DVI devices.

YES

Are the video signal and the synchronized signal input from pins 
(AK17/PC__R) (AK16/PC__G) (AH15/PC__B) and (AK14/
PC_HSYNC) (AJ14/PC_VSYNC) of IC3302 (Digital AV decode & 
Main CPU)?

NO

Check the line between SC501 and IC3302.

YES

Refer to “The picture doesn't appear in all modes.”

LC-40/46/52LE820E, LC-40/46LU820E

7 – 10

                                            
Is the Hot plug detection function output from pin (19) of the 
HDMI-1 (SC1503) normal?

NO

Check the line between SC1503 and pin (45) of IC1504 (HDMI-
SW).

Is the Hot plug detection function output from pin (19) of the 
HDMI-2 (SC1502) normal?

NO

Check the line between SC1502 and pin (41) of IC1504 (HDMI-
SW).

Is the Hot plug detection function output from pin (19) of the 
HDMI-3 (SC1501) normal?

NO

Check the line between SC1501 and pin (35) of IC1504 (HDMI-
SW).

Is the Hot plug detection function output from pin (19) of the 
HDMI-4 (SC1505) normal?

NO

Check the line between SC1505 and pin (31) of IC1504 (HDMI-
SW).

YES

NO

Check the setting of an external input device that connects with 
HDMI-1/2/3/4.

Is EDID data pins (44/HDMI1_SCL), (43/HDMI1_SDA) of IC1504 
accessed, and is it read from pins (15, 16) of a HDMI-1 
(SC1503)?

NO

Is access possible in the exchange of IC1504?

Is EDID data pins (40/HDMI2_SCL), (39/HDMI2_SDA) of IC1504 
accessed, and is it read from pins (15, 16) of a HDMI-2 
(SC1502)?

NO

Is EDID data pins (34/HDMI3_SCL), (33/HDMI3_SDA) of IC1504 
accessed, and is it read from pins (15, 16) of a HDMI-3 
(SC1501)?

Check the peripheral circuit of SC1502/1503/1505/1501and 
IC1504.

Is EDID data pins (30/HDMI3_SCL), (29/HDMI3_SDA) of IC1504 
accessed, and is it read from pins (15, 16) of a HDMI-4 
(SC1505)?

YES

Is TMDS signal input into pins (20, 19/HDMI1_CLKP/N), (22,21/
HDMI1_D0P/N), (24, 23/HDMI1_D1P/N), (26, 25/HDMI1_D2P/N) 
of IC1504 from HDMI-1 (SC1503)?

NO

Check the line between HDMI-1 (SC1503) and IC1504.

Is TMDS signal input into pins (12, 11/HDMI2_CLKP/N), (14, 13/
HDMI2_D0P/N), (16, 15/HDMI2_D1P/N), (18, 17/HDMI2_D2P/N) 
of IC1504 from HDMI-2 (SC1502)?

NO

Check the line between HDMI-2 (SC1502) and IC1504.

Is TMDS signal input into pins (2, 1/HDMI3_CLKP/N), (4, 3/
HDMI3_D0P/N), (6, 5/HDMI3_D1P/N), (8, 7/HDMI3_D2P/N) of 
IC1504 from HDMI-3 (SC1501)?

NO

Check the line between HDMI-3 (SC1501) and IC1504.

Is TMDS signal input into pins (66, 65/HDMI4_CLKP/N), (68, 67/
HDMI4_D0P/N), (70, 69/HDMI4_D1P/N), (72, 71/HDMI4_D2P/N) 
of IC1504 from HDMI-4 (SC1505)?

NO

Check the line between HDMI-4 (SC1505) and IC1504.

YES

Are TMDS_Rx and the I2C_SINK signal output from IC1504 
respectively?
Pins (62, 63/SW_TMDS_CLKP/N), (60, 61/SW_TMDS_D0P/N), 
(58, 59/SW_TMDS_D1P), (56, 57/SW_TMDS_D2P)

NO

Check the IC1504 and peripheral circuits.

YES

Is the TMDS_Rx/ I2C_SINK signal input to IC3302 (Digital AV 
decode & Main CPU)?
Pins (AK6, AJ6/SW_TMDS_CLKP/N), (AK7, AJ7/
SW_TMDS_D0P/N), (AK8, AJ8/SW_TMDS_D1P/N), (AK9, AJ9/
SW_TMDS_D2P/N) from IC1504

NO

Check the line between IC1504 and IC3302.

YES

Refer to “The picture doesn't appear in all modes.” or “No sound 
output in all modes.”

LC-40/46/52LE820E, LC-40/46LU820E

7 – 11

                                            
Is CVBS signal output into pin (2) of EXT1 (SC505)?

YES

Check the setting of an external input device that connects with 
EXT1.

NO

Is CVBS signal output to pin (2) of IC504?

YES

Check the line between SC505 and IC504.

NO

Is TU_OUT_CVBS_MUTE [pin (1) of IC504] at “H”?

YES

Check the peripheral circuits of IC3302.

NO

Is CVBS signal input to pin (6) of IC504?

YES

Check the IC504 and their peripheral circuits.

NO

Is CVBS signal output to pin (A27) of IC3302 (Digital AV decode 
& Main CPU)?

YES

Check the line between IC504 and IC3302.

NO

In the case that No picture appears on EXT1connected monitor during the ATV reception., refer to (A)
In the case that No picture appears on EXT1connected monitor during the DTV reception., refer to (B)

(A)

(B)

Refer to “No picture on the display (2)”

Refer to “No picture on the display (3)”

                                            
Does the signal in/output to pins (1), (2), (3), (4) of LAN-jack 
(J9501)?

NO

Check the interface device and peripheral circuits. (power-LED of 
hub, LINK-LED of hub)

YES

Does the signal in/out to pins (12, 11/TX+-), (10, 9/RX+-) of 
IC9501?

NO

Check the line between J9501 and IC9501.

YES

Does the signal in/output to pins [18, 19, 47, 29, 41, 27, 23, 22/
ONDA6~13], [21, 20, 35, 36, 38, 39, 34/ONDD8~14], [28, 33/
N_ONDCE0, N_ONDCE1] of LAN-jack (J9501)?

NO

Check IC9501 and its peripheral circuits.

YES

Does the signal in/output to pins [A8, B8, C9, C8, A7, F10, A4, 
B4/ONDA6~13], [D13, F13, D11, E11, F12, E12, E13/
ONDD8~14], [C6, B3/N_ONDCE0, N_ONDCE1] of IC3302 (Digi-
tal AV decode & Main CPU)?

NO

Check the line between X9501 and IC9501.
Check the crystal X9501. (SCA219WJ)

YES

Check IC9501 and its peripheral circuits.

LC-40/46/52LE820E, LC-40/46LU820E

7 – 12

                                            
Is the AC cord connector tightly connected to the set?

NO

Reconnect the AC cord tightly and turn on the power again.

YES

Are the wire harnesses and other cables properly connected in 
the set?

NO

Reconnect the wire harnesses and other cables properly in the 
set.

YES

Does Power starts up (central Icon LED lights up)?

NO

Refer to “No power (central Icon LED failure to light up) or no 
startup (central Icon LED failure is flashing)”

YES

Is there the pins (12/PNL_POW) of P9601 at “H”?

NO

Check the power unit, and the signal line between PNL_POW 
and IC3302.

YES

Is there the pins (8/STB) of P9602 at “H”?

NO

Check the power unit, and the signal line between STB and 
IC2002.

YES

Replace the power unit.

Does a single or 
several vertical 
stripes appear on 
the LCD screen?

Does a single or sev-
eral horizontal stripes 
appear on the LCD 
screen?

Do luminescent or 
black dots appear 
on the screen?

Is the on-screen 
image rippling or 
distorted?

Is there any portion 
which some 
screens were dark-
ish or became 
whitish?

Does all LED of 
one line are not 
lighting?

Replace the LCD panel or the power unit.

The backlight func-
tions. Does not the 
image come out in the 
LCD screen (screen 
black)?

Does the entire LCD 
screen look whitish all 
over?

Does the QS drive func-
tion?

Are the data bit drop-
out? (No solution even 
when turning on and off 
the QS drive)

Is the gamma correc-
tion as specified?

Replace the LCD_CONT_UNIT.