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Model
LC-70LE741E (serv.man11)
Pages
63
Size
2.82 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Troubleshooting Table
File
lc-70le741e-sm11.pdf
Date
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LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 13
[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 [AM16/COMP_Y1P), 
(AJ18/COMP_PR1P) and (AK17/COMP_PB1P] of IC3303 (Digi-
tal AV decode & Main CPU)?
NO
Check the line between J511 and IC3303.
YES
Refer to “No picture on the display (1)”.
[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 [AM15/
PC_RP, AK15/PC_GP, AK13/PC_BP, and AL13/PC_HSYNC,   
AM13/PC_VSYNC] of IC3303 (Digital AV decode & Main CPU)?
NO
Check the line between SC501 and IC3303.
YES
Refer to “No picture on the display (1)”.
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 14
[External input HDMI-1/2/3/4] No picture on the display (11)
Does not the picture/sound of the HDMI signal input to HDMI-1/2/3/4 go out?
                                            
Is the Hot plug detection function output from pin [19] of the 
HDMI-1 (SC1503) normal?
NO
Check the line between SC1503 and pin [59] of IC1504 (HDMI-
SW).
Is the Hot plug detection function output from pin [19] of the 
HDMI-2 (SC1502) normal?
NO
Check the line between SC1502 and pin [74] of IC1504 (HDMI-
SW).
Is the Hot plug detection function output from pin [19] of the 
HDMI-3 (SC1501) normal?
NO
Check the line between SC1501 and pin [55] of IC1504 (HDMI-
SW).
Is the Hot plug detection function output from pin [19] of the 
HDMI-4 (SC1505) normal?
NO
Check the line between SC1505 and pin [50] of IC1504 (HDMI-
SW).
YES
NO
Check the setting of an external input device that connects with 
HDMI-1/2/3/4.
Is EDID data pins [58/HDMI1_SCL, 57/HDMI1_SDA] of IC1504 
accessed, and is it read from pins [15, 16] of a HDMI-1 
(SC1503)?
NO
Is access possible in the exchange of IC1504?
Is EDID data pins [73/HDMI2_SCL, 72/HDMI2_SDA] of IC1504 
accessed, and is it read from pins [15, 16] of a HDMI-2 
(SC1502)?
NO
Is EDID data pins [54/HDMI3_SCL, 53/HDMI3_SDA] of IC1504 
accessed, and is it read from pins [15, 16] of a HDMI-3 
(SC1501)?
Check the peripheral circuit of SC1501/1502/1503/1505 and 
IC1504.
Is EDID data pins [49/HDMI4_SCL, 48/HDMI4_SDA] of IC1504 
accessed, and is it read from pins [15, 16] of a HDMI-4 
(SC1505)?
YES
Do TMDS signals input to pins [26&27/
HDMI1_CLKNP_222.75MHz, 28&29/HDMI1_D0NP, 30&31/
HDMI1_D1NP, 32&33/HDMI1_D2NP] of IC1504?
NO
Check the line between HDMI-1 (SC1503) and IC1504.
Do TMDS signals input to pins [17&18/
HDMI2_CLKNP_222.75MHz, 19&20/HDMI2_D0NP, 21&22/
HDMI2_D1NP, 23&24/HDMI2_D2NP] of IC1504?
NO
Check the line between HDMI-2 (SC1502) and IC1504.
Do TMDS signals input to pins [8&9/
HDMI3_CLKNP_222.75MHz, 10&11/HDMI3_D0NP, 12&13/
HDMI3_D1NP, 14&15/HDMI3_D2NP] of IC1504?
NO
Check the line between HDMI-3 (SC1501) and IC1504.
Do TMDS signals input to pins [99&100/
HDMI4_CLKN_222.75MHz, 1&2/HDMI4_D0NP, 3&4/
HDMI4_D1NP, 5&6/HDMI4_D2NP] of IC1504?
NO
Check the line between HDMI-4 (SC1505) and IC1504.
YES
Do TMDS signals output from pins [87&86/
SW_TMDS_CLKNP_222.75MHz_, 85&84/SW_TMDS_D0NP_, 
83&82/SW_TMDS_D1NP_, 81&80/SW_TMDS_D2NP_] of 
IC1504 respectively?
NO
Check the IC1504 and peripheral circuits.
YES
Do TMDS signals input to pins [AM9&AL9/
SW_TMDS_CLKNP_222.75MHz, AM10&AL10/
SW_TMDS_D0NP, AM11&AL11/SW_TMDS_D1NP, 
AM12&AL12/SW_TMDS_D2NP] of IC3303 (Digital AV decode & 
Main CPU)?
NO
Check the line between IC3303 and IC1504.
YES
Refer to “Refer to “No picture on the display (1)” or “The sound is not emitted from the Speaker.”
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 15
<During external connection> No picture on the monitor
No picture appears on EXT1 connected monitor during the ATV reception.
                                            
Does CVBS signal output from pin [19] of EXT1 (SC505)?
YES
Check the setting of an external input device that connects with 
EXT1.
NO
Does CVBS signal output from pin [5] of IC510?
(CAPLESS VIDEO AMP with LPF)
YES
Check the line between SC505 and IC510.
NO
Does CVBS signal input to pin [3] of IC510?
YES
Check the peripheral circuits of IC510.
NO
Does CVBS signal output from pin [2] of IC507?
YES
Check the line between IC507 and IC510.
NO
Is CVBS_OUT_MUTE [pin (1)] of IC507 at “L”?
YES
Check the line between IC3303 and IC507.
Check the peripheral circuits of IC3303.
NO
Does CVBS signal input to pin [6] of IC507?
YES
Check the peripheral circuits of IC507.
NO
In the case of LE740, LE743 series, refer to (A)?
In the case of LE741 series, refer to (B)?
(A)
(B)
Check the line between IC507 and TUNER (TU1102). 
(Q1106 etc...)
Check the line between IC507 and TUNER (TU1104).
(Q1106 etc...)
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 16
<During external connection> No picture on the monitor
No picture appears on EXT1 connected monitor during the DTV reception.
                                            
Does CVBS signal output from pin [19] of EXT1 (SC505)?
YES
Check the setting of an external input device that connects with 
EXT1.
NO
Does CVBS signal output from pin [5] of IC510 (CAPLESS 
VIDEO AMP with LPF)?
YES
Check the line between SC505 and IC510.
NO
Does CVBS signal input to pin [3] of IC510?
YES
Check the peripheral circuits of IC510.
NO
Does CVBS signal output from pin [2] of IC507?
YES
Check the line between IC507 and IC510.
NO
Is CVBS_OUT_MUTE [pin (1)] of IC507 at “H”?
YES
Check the line between IC3303 and IC507.
Check the peripheral circuits of IC3303.
NO
Does CVBS signal input to pin [4] of IC507?
YES
Check the peripheral circuits of IC507.
NO
Does CVBS signal output from pin (AJ20/CPU_VDAC1_OUT) of 
IC3303 (Digital AV decode & Main CPU)?
YES
Check the line between IC3303 and IC507.
Check the peripheral circuits of IC3303.
NO
Refer to “No picture on the display (3) (4)”.
[External input Network] No picture on the display
Does not the signal input to Network go out?
                                            
Does the signal in/output to pins (1), (2), (3), (6) of LAN-jack 
(J9501)?
NO
Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
YES
Do signals in/output to pins of IC3303 (Digital AV decode & Main 
CPU)?
Pins [AD32&AD31/CPU_DATMDI_RJ45_TPN, AE32&AE31/
CPU_DATMDI_RJ45_RPN] 
NO
Check the line between IC3303 and J9501.
(T9501 etc...)
YES
Check IC3303 and its peripheral circuits.
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