DOWNLOAD Sharp LC-70LE747EN (serv.man2) Service Manual ↓ Size: 10.06 MB | Pages: 86 in PDF or view online for FREE

Model
LC-70LE747EN (serv.man2)
Pages
86
Size
10.06 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / (PWB Section Only)
File
lc-70le747en-sm2.pdf
Date
PREV: Sharp LC-70LE747EN Service Manual

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LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU
6 – 6
No sound from external output device (4)
Does not the sound of the audio signal output to HDMI1 go out?
Does audio signal output from pin[14] of SC1501 (HDMI1 terminal) ?
YES
Check SC1501 and peripheral circuits.
NO
Does audio signal output from pin[39/HECP] of IC2601(HDMI-SW) ?
YES
Check  the line between IC2601 and SC1501.
NO
Does audio signal input to pin[36/HDMI_ARC_SPDIF] of IC2601 ?
YES
Check IC2601 and peripheral circuits.
NO
Does audio signal(HDMI_OPT_OUT) output from pin[Y32/
CPU_ASPDIF1] of IC3301(Digital AV decode & Main CPU)?
YES
Check the line between IC3301 and IC2601.
NO
Check IC3301 and its peripheral circuits.
No picture on the display (1)
The picture doesn't appear in all modes.
Is the signal output from IC3301(DIGITAL_AV_DECODER_&_MAIN_CPU) respectively?
[VBO_TXA+-(AT4/AU7),  VBO_TXB+-(AP3/AR3),  VBO_TXC+-(AT2/AU2),  VBO_TXD+-(AR1/AR2)]
YES
NO
Check IC3301 and its peripheral control circuits.
(IC2004, IC3501, IC3502,  IC3503, IC3504, X3301, etc.)
Do above-mentioned signals output from connector 
(SC3801) ?
NO
Check the line between IC3301 and SC3801.
YES
Similarly, is LCD controller's control signal normal ?
NO
Please check each control signal of DET_POW(DET_PNL12V), 
PE(PNL_EN).
YES
LCD Controller Unit: 
Do signals input to connector(LW) of LCD Controller Unit ?
NO
Wire harness (LV) is checked.
YES
Check the panel module.
LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU
6 – 7
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
Does  video signal (CVBS) output from pin[9] of TUNER(TU1101) ?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Does video signal (TUNER_CVBS) input to pin [AN29/
CPU_CVBS0P] of IC3303(Digital AV decode & Main CPU) ?
NO
Check the line between TU1101 and IC3301.
(Q1106, etc...)"
YES
Refer to “No picture on the display (1)”
No picture on the display (3)
Does not the picture come out when DTV is received?
Refer to “No sound (during the reception of TV(DIGITAL) broadcasting)”
No picture on the display (4)
Does not the picture come out when DTV(Satellite) is received?
Refer to “No sound (during the reception of TV(DIGITAL-Satellite) broadcasting)”
[External input EXT1] No picture on the display (5)
Does not the picture of the CVBS signal input to EXT1 go out?
Does CVBS signal input to pin[20] of EXT1 (SC505) ?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Does CVBS signal input to pin [AR30/CPU_CVBS2P] of IC3301
 (Digital AV decode & Main CPU)
NO
Check the line between SC505 and IC3301.
YES
Refer to “No picture on the display (1)”
LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU
6 – 8
[External input EXT1] No picture on the display (6)
Does not the picture of the Y/C video signal input to EXT1 go out?
Does Y/C video signal input to  pins [20/Y , 15/C] of EXT1(SC505) ?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Does Y/C signal input to pins [AR30/CPU_CVBS2P, AR28/
SC_PR0P] of IC3301 (Digital AV decode & Main CPU) 
NO
Check the line between SC505 and IC3301.
YES
Refer to “No picture on the display (1)”
[External input EXT1]  No picture on the display (7)
Does not the picture of the R/G/B signal input to EXT1 go out?
Do RGB signals input to pins[15/RGB_IN_RED/C, 11/
RGB_IN_GREEN and 7/RGB_IN_BLUE ] of EXT1(SC505) ?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Do RGB signals from EXT1(SC505) input to pins [AR28/SC_PR0P, 
AT28/SC_PB0P and AP27/SC_Y0P] of IC3301 (Digital AV decode & 
Main CPU)
NO
Check the line between SC505 and IC3301.
YES
Refer to “No picture on the display (1)”
[External input EXT2] No picture on the display (8)
Does not the picture of the CVBS signal input to EXT2 go out?
Does CVBS signal input to pin[5] of EXT2 (J511) ?
Is CVBS_PLUG [4/CVBS1_PLUG] of J511 at "L" ?
NO
Check the setting of an external input device that connects with 
EXT2.
YES
Does CVBS signal input to pin [AR31/CPU_CVBS1P] of IC3301 
(Digital AV decode & Main CPU) ?
NO
Check the line between  J511 and  IC3301.
YES
Refer to “No picture on the display (1)”
[External input EXT3] No picture on the display (9)
Does not the picture of the COMPONENT signal input to EXT3 go out?
Do COMPONENT signals input to pins [13/COMP1_Y, 10/
COMP1_Pr, 11/COMP1_Pb] of EXT3 (J511) ?
NO
Check the setting of an external input device that connects with 
EXT3.
YES
Do COMPONENT signals input to pins [AU26/COMP_Y1P), (AP26/
COMP_PR1P)  and (AR26/COMP_PB1P] of IC3301 (Digital AV 
decode & Main CPU) ?
NO
Check the line between J511 and IC3301.
YES
Refer to “No picture on the display (1)”
LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU
6 – 9
[External input PC] No picture on the display (10)
Does not the picture of the ANALOG-RGB signal input to PC_IN (15pin-D-SUB terminal) go out?
Do ANALOG-RGB and synchronized signal input to pin
[(1, 2, 3)/(PC_RED, GREEN, BLUE), (14 and 13)/(PC_VSYNC, 
H.Sync) ] of PC_IN (SC501) ?
NO
Check the connection and setup with the external PC_IN devices.
YES
Do ANALOG-RGB and synchronized signal input to pins [AR25/
PC_RP, AR24/PC_GP, AU24/PC_BP, and AN25/PC_HSYNC,   
AM25/PC_VSYNC] of IC3301 (Digital AV decode & Main CPU) ?
NO
Check the line between SC501 and IC3301.
YES
Refer to “No picture on the display (1)”
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