LC-46XL2E (serv.man4). Troubleshooting Table - Sharp TV Service Manual (repair manual)

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LC-46XL2E (serv.man4)
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22
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Service Manual
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Device
TV / LCD / Troubleshooting Table
File
lc-46xl2e-sm4.pdf
Date

View Sharp LC-46XL2E (serv.man4) Service Manual online

LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 1
LC42XL2E
Service Manual
 
CHAPTER 4. 
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
Power unit operation check.
                                            
Are the power cord and harness in the unit properly connected?
NO
Connect the power cord and harness properly, and turn on the
power.
LINE_FILTER_UNIT:            
YES
Is F7000 normal?
NO
LINE_FILTER_UNIT:
Isn't FL7001, L7001, R7002, CX7000-1, Z7000, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit 
is checked.
POWER_UNIT:
BD7000, TH7000-1, IC7801,Z7800, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit 
is checked. 
POWER_UNIT                    
YES
Is B_BUS (+320V) output? (Set the main power SW to OFF.)
* When power on/off switch is on 
• • • About +400V
NO
Does the PFC circuit operate normally?
(L7800, L7801, T7800, D7806, Q7804-5, IC7800-1 and etc. And, 
the circuit around the protection circuit etc. is checked.)
YES
Is a voltage of BU5V applied to pin (8) of connector (PD)?
(Set the main power SW to OFF.)
NO
Does the switching circuit operate normally?
Check circuit around the primary side (T7901, IC7905, Q7902, 
Q7912-3, D7908-9, D7904, D7910, etc.), the secondary side 
(D7918, L7900, etc.), the AC_DET circuit (D7911-2, IC7909, 
IC7902, Q7910, Q7901, etc.), and the protection circuit.
YES
Are INV60V, UR15, and S15V output as for the power on/off 
switch when it is on?
NO
Does the inverter circuit operate normally?
Check circuit around the primary side (T7001, T7601, IC7603, 
IC7601, IC7600, Q7600-2, D7608, D7610, D7613, etc.), the sec-
ondary side (D7560-3, L7560, D7150-1, L7150, L7152, Q7911, 
etc.), the PS_ON circuit (Q7300-1, etc.), and the protection cir-
cuit.
YES
Similarly, is PNL12V output as for the power on/off switch when it 
is on?
NO
Check PNL_POW circuit of Q7121-2, etc. and the circuit around 
the regulator circuit etc. of IC7121, L7121, D7121, etc.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 2
The sound is not emitted from the speaker though the picture has come out. 
                                            
No sound output in all modes?
TEREMINAL UNIT:               
Is the audio signal output of pins (38) (L-ch) and (39) (R-ch) of 
IC1404 (CODEC) normal?
NO
Check IC1404 and its peripheral circuits.
YES
Is audio signal input to pin (5/L), pin (9/R) of IC1301 (AMP)?
NO
Check the line between IC1404 and IC1301.
YES
Is MUTE circuit [SP_MUTE_LINE, S_STBY_LINE] normal?
NO
Check the SP_MUTE_LINE and S_STBY_LINE.
(Q1302, etc.)
YES
Is the audio signal output of pins (2, 1) (L-ch) and (3, 4) (R-ch) of 
P1301(AOUDIO-CONNECTOR) normal?
NO
Check IC1301 and its peripheral circuits.
YES
Check Speaker Box (right and left) and wire harness.
No sound (during the reception of TV(ANALOG) broadcasting) 
                                            
Does not the sound go out though the picture has come out when UHF/VHF is received?
TEREMINAL UNIT:               
Is the IF signal output from pin (17) of TUNER (TU7501)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Is the SIF signal sent to pins (23) and (24) of IC7504 (IFDE-
MOD)?
NO
Check FL7501 and its peripheral circuits.
YES
Is the SIF signal input from pin (12) of IC7504 to pin (3) of IC1402 
(SOUND MULTIPLEX DECODER)?
NO
Check the line between IC7504 and IC1402.
(Q7504, etc.)
YES
Is audio signal input from pin (24/L-ch), (22/R-ch) of IC1402 to 
pin (61, 62) of IC1404 (CODEC)?
NO
Check the line between IC1402 and IC1404.
YES
Refer to “No sound output in all modes”.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 3
No sound (during the reception of TV (DIGITAL) broadcasting) 
                                            
Does not the sound go out though the picture has come out when DTV is received?
MAIN UNIT:                          
Is DTV_SPDIF audio signal output from pin (T2) of IC8101 (CPU/
DECODER) to pin (42) of connector SC1101?
NO
Check the line between IC8101 and SC1101, and their peripheral 
circuits.
TERMINAL UNIT:                 
YES
Is DTV_SPDIF audio signal input from pin(42) of connector 
SC501 to pin(4) of IC1404(CODEC)?
NO
Check the line between SC501 and IC1404.
(SC1101/SC501, etc.)
YES
Refer to “No sound output in all modes”.
No sound from external input devices (1) 
                                            
Does not the sound of the audio signal input to EXT1(SCART1) go out?
Does not the sound of the audio signal input to EXT2(SCART2) go out?
TEREMINAL UNIT:               
EXT1
Is the audio signal properly sent to pins (6) (IN1_L) and (2) 
(IN1_R) of SCART1(SC502)?
NO
Check the setting of an external input device that connects of 
SC502.
EXT2
Is the audio signal properly sent to pins (6) (IN2_L) and (2) 
(IN2_R) of SCART2(SC503)?
NO
Check the setting of an external input device that connects of 
SC503.
YES
EXT1
Is the audio signal properly sent to pins (51) (IN1_L) and (52) 
(IN1_R) of IC1404(CODEC)?
NO
Check the line between SC502 and IC1404.
EXT2
Is the audio signal properly sent to pins (53) (IN2_L) and (54) 
(IN2_R) of IC1404(CODEC)?
NO
Check the line between SC503 and IC1404.
YES
Refer to “No sound output in all modes”.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 4
No sound from external input devices (2) 
                                            
Does not the sound of the audio signal input to EXT3 go out?
MINI AV_UNIT:                    
Is audio signal output from pin (5/IN3-L), (4/IN3-R) of input termi-
nal J901 to pin (3), (1) of connector P901?
NO
Check connection of between from J901 to P901 and the exter-
nal input device.
TERMINAL UNIT:                 
YES
Is audio signal input to pin (3/IN3-L), (1/IN3-R) of connector 
P501?
NO
Check the connector (P901/P501).
YES
Is audio signal input to pin (55/IN3-L), (56/IN3-R) of IC1404 
(CODEC)?
NO
Check the line between P501 and IC1404.
YES
Is CVBS signal detection signal V3_PLUG signal from pin (7) in 
input terminal J901 normal?
NO
Check the connection to J901 and external devices.
YES
Is V3_PLUG signal input to pin (2) of IC506 (VIDEO SELEC-
TOR)?
NO
Everything from V3_PLUG_LINE J901 to pin (2) of IC506 is 
checked. (connector P901/P501 and etc.)
YES
Refer to “No sound output in all modes”.
No sound from external input devices (3) 
                                            
Does not the sound of the audio signal input to EXT4/5/6 (HDMI) go out?
                                            
Is picture of the signal input from EXT4/5/6 displayed?
NO
Refer to “Does not the picture of the HDMI signal input to EXT4/
5/6 go out?”.
MAIN UNIT:                         
YES
Is the HDMI_SPDIF audio signal output from pin (W12) of 
IC3301 (VIDEO PROCESSOR) to pin (44) of connector 
SC1101?
NO
Check the line between IC3301 and SC1101, and their peripheral 
circuits.
TERMINAL UNIT:                
YES
Is HDMI_SPDIF audio signal input from pin (44) of connector 
SC501 to pin (5) of IC1404 (CODEC)?
NO
Check the line between SC501 and IC1404.
(SC1101/SC501, etc.)
YES
Refer to “No sound output in all modes”.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 5
No sound from external input devices (4) 
                                            
                                             
Does not the sound of the audio signal input to EXT6 (Analog) go 
out?
Does not the sound of the audio signal input to EXT7 go out?
                                            
MAIN UnIT:                           
Whether “Analog” has selected it in the Audio setup of the HDMI 
option is checked.
MAIN UNIT:                         
YES
Is audio signal sent from pin (2/L) and (3/R) of input terminal 
J1502 to pin (1) and (6) of IC1504 (SW)?
YES
Is audio signal sent from pin (2/L) and (3/R) of input terminal 
J1501 to pin (3) and (7) of IC1504 (SW)?
                                            
NO
NO
Check the connection between J1502 and the peripheral circuit, 
the external input devices.
Check the connection between J1501 and the peripheral circuit, 
the external input devices.
Is audio signal output from pin (15/HDMI_PC_L) and pin (11/HDMI_PC_R) of IC1504 to pin (24) and (26) of connector SC1101?
TERMINAL UNIT:                
YES
NO
Check the line between IC1504 and SC1101, and their peripheral 
circuits.
Is audio signal (HDMI_PC_L=MAIN_L, HDMI_PC_R=MAIN_R) 
sent to pins (24) and (26) of SC501?
NO
Check the connector (SC1101/SC501)
YES
Is audio signal input to pin (59/MAIN_L) and (60/MAIN_R) of 
IC1404 (CODEC)?
NO
Check the line between P501 and IC1404.
YES
Refer to “No sound output in all modes”.
No sound from external input devices (5) 
                                            
Does not the sound of the audio signal input to EXT8 go out?
TEREMINAL UNIT:               
Is audio signal sent from pins (2/IN4-L) and (4/IN4-R) of input ter-
minal J502?
NO
Check the connection to J502 and external devices.
YES
Is audio signal sent from pins (57/IN4-L) and (58/IN4-R) of 
IC1404?
NO
Check the line between J502 and IC1404.
YES
Refer to “No sound output in all modes”.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 6
The audio signal is not output (1)
                                             
The audio signal of UHF/VHF and DTV is not output from EXT1 (SCART).
TEREMINAL UNIT:               
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART1 
(SC502)?
YES
Check the connection to SCART1 and external devices.
NO
Is S-MUTE-LINE [MAIN_UNIT pin (93) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S-MUTE_LINE.
(Q502, Q504, etc.)
NO
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402 
(SOUND MULTIPLEX DECODER)?
YES
Check the line between SC502 and IC1402.
(Q508, Q507, IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.
The audio signal is not output (2)
                                             
The audio signal of UHF/VHF and DTV is not output from EXT2 (SCART). 
TEREMINAL UNIT:               
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2 
(SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE-LINE [MAIN_UNIT pin (91) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S2-MUTE_LINE.
(Q501, Q503, etc.)
NO
Is audio signal sent to pins (3/L-ch) and (13/R-ch) of IC7510 
(SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
NO
Is audio signal input to pins (2/L-ch) and (15/R-ch) of IC7510?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL_LINE, etc.)
NO
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402 
(SOUND MULTIPLEX DECODER)?
YES
Check the line between IC7510 and IC1402.
(IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 7
The audio signal is not output (3)
                                             
The audio signal of MONITOR is not output from EXT2 (SCART). 
TEREMINAL UNIT:               
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2 
(SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE-LINE [MAIN_UNIT pin (91) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S2-MUTE_LINE.
(Q501, Q503, etc.)
NO
Is audio signal sent to pins (3/L-ch) and (13/R-ch) of IC7510 
(SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
NO
Is audio signal input to pins (1/L-ch) and (12/R-ch) of IC7510?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL_LINE, etc.)
NO
Is audio signal sent to pins (40/L-ch) and (41/R-ch) of IC1404 
(CODEC)?
YES
Check the line between IC7510 and IC1404.
(IC1405, etc.)
NO
Check IC1404 and its peripheral circuits.
The audio signal is not output (4)
                                             
No audio signal output from AUDIO_OUTPUT terminal.
TEREMINAL UNIT:               
Is audio signal output to pin (4/L-ch), (2/R-ch) of audio output ter-
minal J503?
YES
Check the connection to J502 and external devices.
NO
Do pin (72)] of MONITOR_MUTE_LINE [IC506 
(VIDEO_SELECTOR), pin (55)] of MUTE-A_ALL_LINE 
[MAIN_UNIT IC2002 (UCON) become H?
YES
Check the IC506,IC2002, its peripheral circuit and 
MONITOR_MUTE_LINE, MUTE-A_ALL_LINE.
(Q512, Q511, D551, etc.)
NO
Is the audio signal output of pins (40/L-ch) and (41/R-ch) of 
IC1404 (CODEC)?
YES
Check the line between IC1404 and J503.
(IC1405, Q509, Q510, etc.)
NO
Check IC1404 and its peripheral circuits.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 8
The audio signal is not output (5)
                                             
No audio signal output from DIGITAL_AUDIO_OUTPUT terminal.
TEREMINAL UNIT:               
Is audio signal output to pin (1) of digital sound output terminal 
D501?
YES
Check D501 or peripheral circuits.
(B3.3V_LINE, etc.)
NO
Do pin (92) of SPDIF_MUTE_LINE [MAIN_UNIT IC9101 
(CPLD)], pin (55) of MUTE-A_ALL_LINE [MAIN_UNIT IC2002 
(UCON)] become H?
YES
Check IC9101, IC2002, its circumference circuit and 
SPDIF_MUTE_LINE, MUTE-A_ALL_LINE.
(Q521, D521, etc.)
NO
Is an audio signal input from pin (23) of IC1404 (CODEC) to pin 
(2) of IC502, and is the logic signal input into pin (1)? 
YES
Check IC502 or peripheral circuits.
NO
Check IC1404 and its peripheral circuits.
The audio signal is not output (6)
                                             
No sound from HEDPHONE_OUTPUT terminal.
MINI AV_UNIT:                     
Is the HP_PLUG signal input into pin (87) of MAIN_UNIT’s 
IC9101 (CPLD) from pin (6) of a headphone terminal (J802)? 
NO
Check the line between J802 and IC9101.
(P801/P1101, IC9105, etc.)
YES
Is the audio signal output to pin (2)/L pin (3)/R of headphone ter-
minal J802?
YES
Check HEAD-PHONE (J802) or peripheral circuits.
MAIN UNIT:                          
NO
Is the audio signal input into pin (5) and (7)of connector P1101 
from pin (68)/L, (70)/R of connector SC1101?
YES
Check the line between P1101 and J802.
(P801/P1101, etc.)
TERMINAL UNIT:                 
NO
Is audio signal sent to pins (68/L-ch), (70/R-ch) of SC501? 
YES
Check the connector SC501/SC1101.
                                             
NO
Is audio signal sent to pins (36/L-ch), (35/R-ch) of IC1404 
(CODEC)? 
YES
Check pin (86) of MUTE circuit HP_MUTE_LINE [MAIN_UNIT 
IC9101 (CPLD) pin (86)] becomes H or not.
(Q1402, Q1401, IC9101, etc.)
                                             
NO
Check IC1404 or peripheral circuits.
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/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)
YES
NO
Check IC3301 and its peripheral control circuits.
(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.
PANEL_UNIT:                       
YES
Similarly, is the LVDS signal input to connector SC4801 (XL2E)/
CN4804 (X20E) of the panel 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)?
NO
Check whether I2C is normally accessed between named 
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)?
NO
Check the line between IC7504 and IC506.
(Q7505, IC7508, etc.)
YES
Is CVBS signal (MAIN_Y/V) output from pin (52) of IC506 to pin 
(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?
NO
Check the connector SC501/SC1101.
YES
Is CVBS signal (MAIN_Y/V) input to pin (Y4) of IC3301 
(VIDEO_PROCESSOR)?
NO
Check the line between SC1101 and IC3301.
YES
Refer to “The picture doesn't appear in all modes.”
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/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)
NO
Each power supply circuit is checked. 
YES
Is IF signal output from pin (20), (21) of TUNER (TU7501) to pin 
(30), (30) of IC7507 (COFDM)?
NO
Check the tuner, IC7507 and their peripheral circuits.
Replace as required.
TERMINAL UNIT:                 
YES
Similarly, is communication control carried out between pin 
(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 (1)/FECLK, (3)/FED_D of a con-
nector (P7501) and pin (51)/FESTR_PSYNC, (50)/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, etc.)
MAIN UNIT:                          
YES
Is the digital signal input into pin (1)/FECLK, (3)/FED_D of a con-
nector (P1103) and pin (51)/FESTR_PSYNC, (50)/FEVAL_DEN 
of a connector (SC1101)?
NO
Connector SC501/SC1101 and P7501/P1103 are checked.
YES
Is the digital signal input into pin (AF3)/FECLK, (AF2)/ FED_D, 
(AF4)/FESTR_PSYNC, (AH3)/FEVAL_DEN of IC8101 (CPU/
DECODER)?
NO
Check the line between SC1101,P1103 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)?
NO
Check IC8101, IC3301 and their peripheral circuits.
(IC8301-IC8304 (DDR2_SDRAM), etc.)
YES
Refer to “The picture doesn't appear in all modes.”

Download Sharp LC-46XL2E (serv.man4) Service Manual (Repair Manual)

Here you can view online and download Sharp LC-46XL2E (serv.man4) Service Manual in PDF. LC-46XL2E (serv.man4) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LC-46XL2E (serv.man4) LCD. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.