Sharp LC-32X20E (serv.man4) Service Manual ▷ View online
LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 9
No picture on the display (1)
The picture doesn't appear in all modes.
MAIN UNIT:
Is LVDS signal output from 1st_channel and 2nd_channel of IC3301(VIDEO PROCESSER) in each mode?
TA1_P/M (A14/B14), TB1_P/M (A15/B15), TC1_P/M (A16/B16), TD1_P/M (A18/B18), TE1_P/M (A19/B19), TCLK1_P/M (A17/B17), TA2_P/M
(A20/B20), TB2_P/M (C20/D19), TC2_P/M (D20/E19), TD2_P/M (F20/G19), TE2_P/M (G20/H19), TCLK2_P/M (E20/F19)
Is LVDS signal output from 1st_channel and 2nd_channel of IC3301(VIDEO PROCESSER) in each mode?
TA1_P/M (A14/B14), TB1_P/M (A15/B15), TC1_P/M (A16/B16), TD1_P/M (A18/B18), TE1_P/M (A19/B19), TCLK1_P/M (A17/B17), TA2_P/M
(A20/B20), TB2_P/M (C20/D19), TC2_P/M (D20/E19), TD2_P/M (F20/G19), TE2_P/M (G20/H19), TCLK2_P/M (E20/F19)
YES
NO
Check IC3301 and its peripheral control circuits.
(IC2002, IC8101, IC3501, IC3502, etc.)
(IC2002, IC8101, IC3501, IC3502, etc.)
Is the above-mentioned LVDS signal output to connector P2601?
NO
Check the line between IC3301 and P2601.
YES
Is LCD controller's control signal normal?
NO
control signals R/L_LINE, U/D_LINE, TEMP1/2/3_LINE,
DET_PNL12V, ROMSEL0_LINE, ROMSEL1_LINE, and it peels
off and whether normality is checked.
DET_PNL12V, ROMSEL0_LINE, ROMSEL1_LINE, and it peels
off and whether normality is checked.
PANEL_UNIT:
YES
Similarly, is the LVDS signal input to connector CN1 of the panel
module?
module?
NO
Wire harness (LW) is checked.
YES
Check the panel module.
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
TERMINAL UNIT:
Is IF signal output from pin (17) of TUNRE (TU7501)?
Is IF signal output from pin (17) of TUNRE (TU7501)?
NO
Check whether I2C is normally accessed between named
TU7501 and IC7507 (COFDM).
TU7501 and IC7507 (COFDM).
YES
Is IF signal input to pin (1) and (2) of IC7504 (IF-DEMO)?
NO
Check the FL7502 (VIF_SAW) and their peripheral circuits.
YES
Is picture signal input from pin (17) of IC7504 to pin (9) of IC506
(VIDEO_SELECTOR)?
(VIDEO_SELECTOR)?
NO
Check the line between IC7504 and IC506.
(Q7505, IC7508, etc.)
(Q7505, IC7508, etc.)
YES
Is CVBS signal (MAIN_Y/V) output from pin (52) of IC506 to pin
(68) of connector SC501?
(68) of connector SC501?
NO
Check the line between IC506 and SC501.
MAIN UNIT:
YES
Is CVBS signal (MAIN_Y/V) input to pin (68) of connector
SC1101?
SC1101?
NO
Check the connector SC501/SC1101.
YES
Is CVBS signal (MAIN_Y/V) input to pin (Y4) of IC3301
(VIDEO_PROCESSOR)?
(VIDEO_PROCESSOR)?
NO
Check the line between SC1101 and IC3301.
YES
Refer to “The picture doesn't appear in all modes.”
LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 10
No picture on the display (3)
Does not the picture come out when DTV is received?
TERMINAL UNIT:
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC7507 (COFDM) supplied?
(Refer to the circuit diagram)
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC7507 (COFDM) supplied?
(Refer to the circuit diagram)
NO
Each power supply circuit is checked.
YES
Is IF signal output from pin (20), (21) of TUNER (TU7501) to pin
(30), (31) of IC7507 (COFDM)?
(30), (31) of IC7507 (COFDM)?
NO
Check the tuner, IC7507 and their peripheral circuits.
Replace as required.
Replace as required.
TERMINAL UNIT:
YES
Similarly, is communication control carried out between pin
(14),(15) of TU7501, and pin (4), (5)of IC7507?
(14),(15) of TU7501, and pin (4), (5)of IC7507?
NO
YES
Does X7502 (20.48MHz) oscillate?
NO
Check X7502 and its peripheral circuits.
YES
Is MPEG data (FECLK, FED_D, FESTR_PSYNC, FEVAL_DEN)
from IC7507 are output to pin (18)/FECLK, (16)/FED_D and pin
(26)/FESTR_PSYNC, (20)/FEVAL_DEN of a connector
(SC501)?
from IC7507 are output to pin (18)/FECLK, (16)/FED_D and pin
(26)/FESTR_PSYNC, (20)/FEVAL_DEN of a connector
(SC501)?
NO
Is the control signal named IC7507 and IC9101 (CPLD) normal?
(FE_RST_LINE, FEERR_LINE, FEPG0_COMP_LINE,
FEPG1_LOCK_LINE, IC7502 etc.)
(FE_RST_LINE, FEERR_LINE, FEPG0_COMP_LINE,
FEPG1_LOCK_LINE, IC7502 etc.)
MAIN UNIT:
YES
Is the digital signal input into pin (18)/FECLK, (16)/FED_D and
pin (26)/FESTR_PSYNC, (20)/FEVAL_DEN of a connector
(SC1101)?
pin (26)/FESTR_PSYNC, (20)/FEVAL_DEN of a connector
(SC1101)?
NO
Check the connector SC501/SC1101.
YES
Is the digital signal input into pin (AF3)/FECLK, (AF2)/ FED_D,
(AF4)/FESTR_PSYNC, (AH3)/FEVAL_DEN of IC8101 (CPU/
DECODER)?
(AF4)/FESTR_PSYNC, (AH3)/FEVAL_DEN of IC8101 (CPU/
DECODER)?
NO
Check the line between SC1101 and IC8101.
YES
Do X8101 (24.00MHz)/ X8102 (32.768kMHz) oscillate?
NO
Check the X8101/ X8102 and their peripheral circuits.
YES
Are video signal VDB_R [0:9], VDB_G [0:9], VDB_B [0:9], and
VBD_CLK/DE/HD/VD are output from IC8101 to IC3301 (VIDEO
PROCESSOR)?
VBD_CLK/DE/HD/VD are output from IC8101 to IC3301 (VIDEO
PROCESSOR)?
NO
Check IC8101, IC3301 and their peripheral circuits.
(IC8301-IC8304 (DDR2_SDRAM), etc.)
(IC8301-IC8304 (DDR2_SDRAM), etc.)
YES
Refer to “The picture doesn't appear in all modes.”
LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 11
<External input EXT1,EXT2> No picture on the display (4)
Does not the picture of the CVBS signal input to EXT1 go out?
Does not the picture of the CVBS signal input to EXT2 go out?
TERMINAL UNIT:
<EXT1>
Is CVBS signal sent to pin (20) of SCART1 (SC502)?
<EXT1>
Is CVBS signal sent to pin (20) of SCART1 (SC502)?
NO
Check the setting of an external input device that connects of
SC502.
SC502.
<EXT2>
Is CVBS signal sent to pin (20) of SCART2 (SC503)?
Is CVBS signal sent to pin (20) of SCART2 (SC503)?
NO
Check the setting of an external input device that connects of
SC503.
SC503.
YES
<EXT1>
Is CVBS signal sent to pin (65) of IC506?
Is CVBS signal sent to pin (65) of IC506?
NO
Check the line between SC502 and IC506.
<EXT2>
Is CVBS signal sent to pin (71) of IC506?
Is CVBS signal sent to pin (71) of IC506?
NO
Check the line between SC503 and IC506.
YES
Is Y/C signal output to pin (68) of connector SC501 from pin (52)
of IC506?
of IC506?
NO
Check the line between IC506 and SC501.
MAIN UNIT:
YES
Is CVBS signal (MAIN_Y/V) input to pin (68) of connector
SC1101?
SC1101?
NO
Check the connector SC501/SC1101.
YES
Is CVBS signal (MAIN_Y/V) input to pins (Y4) of IC3301
(VIDEO_PROCESSOR)?
(VIDEO_PROCESSOR)?
NO
Check the line between SC1101 and IC3301.
YES
Refer to “The picture doesn't appear in all modes.”
LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 12
<External input EXT1,EXT2> No picture on the display (5)
Does not the picture of the R/G/B video signal input to EXT1 go out?
Does not the picture of the R/G/B video signal input to EXT2 go out?
TERMINAL UNIT:
<EXT1>
Is RGB1 signal sent to pins (15)/R1, (11)/G1 and (7)/B1 of
SCART1 (SC502)?
<EXT1>
Is RGB1 signal sent to pins (15)/R1, (11)/G1 and (7)/B1 of
SCART1 (SC502)?
NO
Check the setting of an external input device that connects of
SC502.
SC502.
<EXT2>
Is RGB2 signal sent to pins (15)/R2, (11)/G2 and (7)/B2 of
SCART2 (SC503)?
Is RGB2 signal sent to pins (15)/R2, (11)/G2 and (7)/B2 of
SCART2 (SC503)?
NO
Check the setting of an external input device that connects of
SC503.
SC503.
YES
<EXT1>
Is RGB1 signal sent to pins (25)/R1, (21)/G1 and (23)/B1 of
IC506?
Is RGB1 signal sent to pins (25)/R1, (21)/G1 and (23)/B1 of
IC506?
NO
Check the line between SC502 and IC506.
<EXT2>
Is RGB2 signal sent to pins (31)/R2, (27)/G2 and (29)/B2 of
IC506?
Is RGB2 signal sent to pins (31)/R2, (27)/G2 and (29)/B2 of
IC506?
NO
Check the line between SC503 and IC506.
YES
Is RGB signal output from pin (54), (56), and (55) of IC506 to pin
(66), (62), and (64) of connector (SC501)?
(66), (62), and (64) of connector (SC501)?
NO
Check the line between IC506 and SC501.
MAIN UNIT:
YES
Is RGB signal sent to pins (66), (62), (64) of connector
(SC1101)?
(SC1101)?
NO
Check the connector (SC501/SC1101)
YES
Is RGB signal sent to pins (Y8), (V6), (W9) of IC3301
(VIDEO_PROCESSOR)?
(VIDEO_PROCESSOR)?
NO
Check the line between SC1101 and IC3301.
(Q1104, Q1105, Q1106, etc.)
(Q1104, Q1105, Q1106, etc.)
YES
Refer to “The picture doesn't appear in all modes.”
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