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LC-37D44E/S/RU-BK/GY

4 – 5

The audio signal is not output (1)

No audio signal output from SCART1 terminal.

Is audio signal sent to pins (3/L-ch) and (1/R-ch) of 
SCART1(SC1102)?

YES

Check the connection to SCART1 and external devices.

 NO

Is S-MUTE-LINE [pin(62) of IC2302(SUB_MICON)] at H?

YES

Check the peripheral circuits of IC2302 and S-MUTE_LINE.
(Q1101, etc.)

 NO

Is audio signal sent to pins (24/L-ch) and (23/R-ch) of 
IC3001(MAIN_MICON)?

YES

Check the line between SC1102 and IC3001.
(Q1106, Q1105, etc.)

 NO

Check IC3001 and its peripheral circuits.

The audio signal is not output (2)

No audio signal output from SCART2 terminal.

Is audio signal sent to pins (3/L-ch) and (1/R-ch) of 
SCART2(SC1101)?

YES

Check the connection to SCART2 and external devices.

 NO

Is S2-MUTE-LINE [pin(63) of IC2302(SUB_MICON)] at H?

YES

Check the peripheral circuits of IC2302 and S2-MUTE_LINE.
(Q1102, etc.)

 NO

Is audio signal sent to pins (22/L-ch) and (21/R-ch) of 
IC3001(MAIN_MICON)?

YES

Check the line between SC1101 and IC3001.
(Q1108, Q1107, etc.)

 NO

Check IC3001 and its peripheral circuits.

LC-37D44E/S/RU-BK/GY

4 – 6

The audio signal is not output (3)

 NO

No audio signal output from AUDIO_OUTPUT terminal.

Is audio signal output to pin(2/L-ch), (4/R-ch) of audio out-
put terminal J1304?

YES

Check the connection to J1304 and external devices.

 NO

Is S-MUTE-LINE [pin(62) of IC2302(SUB_MICON)] at H?

YES

Check the peripheral circuits of IC2302 and S-MUTE_LINE.
(Q1303, etc.)

 NO

Is audio signal sent to pins (22/L-ch) and (21/R-ch) of 
IC3001(MAIN_MICON)?

YES

Check the line between J1304 and IC3001.
(Q1302, Q1301, etc.)

 NO

Check IC3001 and its peripheral circuits.

The audio signal is not output (6)

No sound from HEDPHONE_OUTPUT terminal.

Is the HP_PLUG signal input into pin (208) of 
MAIN_UNIT's IC3001 (MAIN_MICON) from pin (6) of a 
headphone terminal (J1003)? 

NO

Check the line between J1003 and IC3001.
(SC1001/P1001, IC3001, etc.)

 YES

Is the audio signal output to pin(2/L-ch) pin(3/R-ch) of 
headphone terminal J1003?

YES

Check HEAD-PHONE (J1003) or peripheral circuits.

 NO

Is the audio signal input into pin (3) and (1) of connector 
SC1001 from pin(3/L-ch),(1/R-ch) of connector P1001? 

YES

Check the line between P1001 and J1003.
(SC1001/P1001, etc.)

 NO

Is HP-MUTE-LINE [pin(40) of IC2302(SUB_MICON)] at 
H?

YES

Check the peripheral circuits of IC2302 and HP-MUTE_LINE.
(Q1001, etc.)

 NO

Is audio signal sent to pins (26/L-ch) and (25/R-ch) of 
IC3001(MAIN_MICON)?

YES

Check the line between P1001 and IC3001.
(IC1102, etc.)

 NO

Check IC3001 and its peripheral circuits.

LC-37D44E/S/RU-BK/GY

4 – 7

No picture on the display (1)

The picture doesn't appear in all modes.

Is the LVDS signal output from IC3001 
(MAIN_MICON)?
LVDS0_P/N(140/141), LVDS1_P/N(137/138), 
LVDS2_P/N(134/135), LVDS3_P/N(128/129), 
LVDS4_P/N(125/126), LVDS_CP/CN(131/132).

NO

Check IC3001 and its peripheral control circuits.

 YES

Is the LVDS signal input to IC8103 (LCD_CONTROL)?
A0+/-(165/164), A1+/-(167/166), A2+/-(169/168), A3+/-
(189/188), A4+/-(191/190), ACK+/-(187/186)

NO

Check the line between IC3001 and IC8103.

 YES

Is the control signal of LCD controller normal?

NO

Check the control signal R/L_LINE, U/D_OUT_LINE, 
FRAME_LINE, BANK_SEL_LINE, TEMP1/2/3_LINE, 
QS_EN_LINE, etc.

 YES

Is VCC_3.3V, VCC_2.5V or VCC_1.5V supplied to 
IC8103?

NO

Check if IC8402(MULTI_CHANNEL_SYSTEM_POWER_SUPPLY) 
and the peripheral power supply circuit are normal.

 YES

Are the video signals BR/BG/BB (0_P/M-3_P/M), FR/
FG/FB (0_P/M-3_M/P) and the CLK signals (BCLK_P/
M, FCLK_P/M) output from IC8103?

NO

Check IC8103 and its peripheral circuits.

 YES

Are BR/BG/BB (0_P/M-3_P/M), BCLK (P/M) input to 
connector SC8201 and FR/FG/FB (0_P/M-3_P/M), 
FCLK (P/M) input to connector SC8202?

NO

Check the line between IC8103 and SC8201/SC8202.

 YES

Are the gradation signals (VH/VL_247, 191, 159, 63, 
31, 0) normally sent from IC8201 (GLAY_LEVEL 
_GENERATION) to SC8201/SC8202?

NO

Check IC8201 and that the communication between its peripheral 
circuits and IC8103 is normal. (Each line of DAC_CLK/DATA/
LATCH)

 YES

Check the connectors SC8201/SC8202 and LCD panel.

LC-37D44E/S/RU-BK/GY

4 – 8

No picture on the display (2)

Does not the picture come out when VHF/UHF is received?

Is the video signal(VIN1) output from pin (6) of TUNER 
(TU201)?

NO

Check whether I2C is normally accessed between named TU201 
and IC3001(MAIN_MICON).

 YES

Is the video signal(VIN1) sent to pins (191) of IC3001 
(MAIN_MICON)?

NO

Check the line between TU201 and IC3001.

 YES

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

No picture on the display (3)

Does not the picture come out when DTV is received?

Is the voltage of regulation for a TUNER circuit and the 
power supply terminal of IC207 (COFDM) supplied? 
(Refer to the circuit diagram) 

NO

Each power supply circuit is checked. 

 YES

Is IF signal output from pin (16),(17) of TUNER(TU201) 
to pin(10),(11) of IC207(COFDM)?

NO

Check the tuner, IC207 and their peripheral circuits.
Replace as required.

 YES

Similarly, is communication control carried out between 
pin (8),(9) of TU201, and pin (20),(21)of IC207? 

NO

 YES

Does X201(27MHz) oscillate?

NO

Check X201 and its peripheral circuits.

 YES

Is the MPEG data (FESCL, FESDA, FEVALID, FES-
TROUT) output from IC207 to IC4001?

NO

Check if the line between IC207 and IC4001 and the control signals 
FERROR_LINE and FERESET_LEINE are normal. (IC4402, etc.)

 YES

Are the video signals (DTV_R/G/B, DTV_CVBS) output 
from PIN(15,16,17), PIN(18) of IC4001?

NO

Check if IC4001, IC4201(SDRAM), IC4251(FLASH_MEMORY) and 
IC4202(B+2.5V_REG) are normal.

 YES

Are the video signals (DTV_R/G/B, DTV_CVBS) input 
to PIN(181,180,179), PIN(184) of IC3001 
(MAIN_MICON)?

NO

Check the line between IC4001 and IC3001.
(IC1401, IC1001, Q1031, etc.)

 YES

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