LC-37D44EBK (serv.man6). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 7

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.