Sharp LC-46X8E (serv.man8) Service Manual / Parts Guide ▷ View online
LC-46X8E/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
Is LVDS signal output from 1st_channel and 2nd_channel of IC3301(VIDEO PROCESSER) in each mode?
TA1
± (A14/B14), TB1± (A15/B15), TC1± (A16/B16), TD1± (A18/B18), TE1± (A19/B19), TCLK1± (A17/B17), TA2± (A20/B20), TB2± (C20/D19),
TC2
± (D20/E19), TD2± (F20/G19), TE2± (G20/H19), TCLK2± (E20/F19)
YES
NO
Check IC3301 and its peripheral control circuits.
(IC2002 (UCON), IC8101 (DECODER), IC3501 (SRAM), IC3502
(SRAM), etc.)
(IC2002 (UCON), IC8101 (DECODER), IC3501 (SRAM), IC3502
(SRAM), etc.)
Is the above-mentioned LVDS signal output to connector
(P2601)?
(P2601)?
NO
Check the line between IC3301 and P2601.
YES
Is LCD controller's control signal normal?
NO
Check control signal line.
(R/L, U/D, TEMP1/2/3, DET_PNL12V, ROMSEL0/1)
(R/L, U/D, TEMP1/2/3, DET_PNL12V, ROMSEL0/1)
LCD_CONT_UNIT:
YES
Similarly, is the LVDS signal input to the connector (CN4804) of
LCD_CONT_UNIT?
LCD_CONT_UNIT?
NO
Check wire harness (LW).
YES
Check the LCD_CONT_UNIT.
No picture on the display (2)
The picture doesn’t come out when VHF/UHF is received.
TERMINAL UNIT:
Is IF signal output from pin (17) of TUNER (TU7501)?
Is IF signal output from pin (17) of TUNER (TU7501)?
NO
Check whether I2C signal is normally accessed between TU7501
and IC7507 (COFDM).
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 video signal (TUNER_CVBS) input from pin (17) of IC7504 to
pin (9) of IC506 (VIDEO_SELECTOR)?
pin (9) of IC506 (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
(2) of connector SC501?
(2) of connector SC501?
NO
Check the line between IC506 and SC501.
MAIN UNIT:
YES
Is CVBS signal (MAIN_Y/V) input to pin (2) 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-46X8E/S/RU
4 – 10
No picture on the display (3)
The picture doesn’t come out when DTV is received.
TERMINAL UNIT:
Is the regulated power supplied to TUNER (5V/5VCONT) and
IC7507 (B3.3V/B1.8V)?
Is the regulated power supplied to TUNER (5V/5VCONT) and
IC7507 (B3.3V/B1.8V)?
NO
Each power supply circuit is checked.
YES
Is IF signal output from pins (20, 21) of TUNER (TU7501) to pins
(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
Does serial control signal (SDA/SCL) operate with pins (15, 14)
of TUNER and pins (5, 4) of IC7507?
of TUNER and pins (5, 4) of IC7507?
NO
YES
Does X7502 (20.48MHz) of IC7507 oscillate?
NO
Check X7502 and its peripheral circuits.
YES
Is MPEG data (FECLK/FED_D/FESTR_PSYNC/FEVAL_DEN)
from IC7507 output to pins (1, 3) of connector (P7501) and pins
(51, 50) of connector (SC501)?
from IC7507 output to pins (1, 3) of connector (P7501) and pins
(51, 50) of connector (SC501)?
NO
Is the control signal named IC7507 and IC9101 (CPLD) normal?
(FE_RST_LINE, FEERR_LINE, FEPG0_COMP_LINE,
FEPG1_LOCK_LINE, etc.)
(FE_RST_LINE, FEERR_LINE, FEPG0_COMP_LINE,
FEPG1_LOCK_LINE, etc.)
MAIN UNIT:
YES
Is the digital signal (FECLK/FED_D/FESTR_PSYNC/
FEVAL_DEN) sent to pins (1, 3) of connector (P1103) and pins
(51, 50) of connector (SC1101)?
FEVAL_DEN) sent to pins (1, 3) of connector (P1103) and pins
(51, 50) of connector (SC1101)?
NO
Check connector (SC501/SC1101 and P7501/P1103).
YES
Is the digital signal (FECLK/FED_D/FESTR_PSYNC/
FEVAL_DEN) input to pins (AF3, AF2, AF4, AH3) of IC8101
(CPU/DECODER)?
FEVAL_DEN) input to pins (AF3, AF2, AF4, AH3) of IC8101
(CPU/DECODER)?
NO
Check the line between SC1101,P1103 and IC8101.
YES
Does X8101 (24.00MHz)/X8102 (32.768kMHz) of IC8101 oscil-
late?
late?
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-46X8E/S/RU
4 – 11
<External input EXT1, EXT2> No picture on the display (4)
The CVBS video signal input from EXT1 doesn’t come out in the display.
The CVBS video signal input from EXT2 doesn’t come out in the display.
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 SCART1 (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 SCART2 (SC503) and IC506.
YES
Is CVBS signal (MAIN_Y/V) output from pin (52) of IC506 to pin
(2) of connector (SC501)?
(2) of connector (SC501)?
NO
Check the line between IC506 and SC501.
MAIN UNIT:
YES
Is CVBS signal (MAIN_Y/V) input to pin (2) 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-46X8E/S/RU
4 – 12
<External input EXT1, EXT2> No picture on the display (5)
The R/G/B video signal input from EXT1 doesn’t come out in the display.
The R/G/B video signal input from EXT2 doesn’t come out in the display.
TERMINAL UNIT:
<EXT1>
Is RGB signal (R1/G1/B1) sent to pins (15, 11, 7) of SCART1
(SC502)?
<EXT1>
Is RGB signal (R1/G1/B1) sent to pins (15, 11, 7) of SCART1
(SC502)?
NO
Check the setting of an external input device that connects of
SC502.
SC502.
<EXT2>
Is RGB signal (R2/G2/B2) sent to pins (15, 11, 7) of SCART2
(SC503)?
Is RGB signal (R2/G2/B2) sent to pins (15, 11, 7) of SCART2
(SC503)?
NO
Check the setting of an external input device that connects of
SC503.
SC503.
YES
<EXT1>
Is RGB signal (R1/G1/B1) sent to pins (25, 21, 23) of IC506
(V_SELECTOR)?
Is RGB signal (R1/G1/B1) sent to pins (25, 21, 23) of IC506
(V_SELECTOR)?
NO
Check the line between SC502 and IC506.
<EXT2>
Is RGB signal (R2/G2/B2) sent to pins (31, 27, 29) of IC506
(V_SELECTOR)?
Is RGB signal (R2/G2/B2) sent to pins (31, 27, 29) of IC506
(V_SELECTOR)?
NO
Check the line between SC503 and IC506.
YES
Is RGB signal output from pin (54, 56, 55) of IC506 to pins (12,
14, 16) of connector (SC501)?
14, 16) of connector (SC501)?
NO
Check the line between IC506 and SC501.
MAIN UNIT:
YES
Is RGB signal sent to pins (12, 14, 16) of connector (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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