LC-70LE741E (serv.man11). Troubleshooting Table - Sharp TV Service Manual (repair manual)

lc-70le741e (serv.man11) service manual
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

Read Sharp LC-70LE741E (serv.man11) Service Manual online

LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 1
LC60LE740E
Service Manual
 
CHAPTER 6. 
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE (LC-60/70LE740E/RU,741E/S,743E)
No power (Central Icon LED failure to light up) or No startup (Central Icon LED is flashing)
                                            
Is the AC cord connector tightly connected to the set?
NO
Reconnect the AC cord tightly and turn on the power again.
YES
Are the wire harnesses and other cables properly connected to 
the set?
NO
Reconnect the wire harnesses and other cables properly to the 
set.
YES
Is power supplied from pins [9/BU+5V] of [PD] P9602?
NO
Replace the power unit.
YES
Is there the pins [12/PS_ON] of [PD] P9602 at “H”?
NO
Check the signal line between PS_ON and IC2001 (UCOM)/
IC3303 (Digital AV decode & Main CPU).
YES
Is there the pins [11/AC_DET] of [PD] P9602 at “H”?
NO
Check the power unit, and the signal line between AC_DET and 
IC2001/IC3303.
YES
Is power supplied from pins [17~20/UR+13V] of [PD] P9602 as 
specified?
NO
Check the line between PS_ON and IC2001/IC3303.
YES
Are the DC/DC converter outputs and the output voltages along
the control lines as specified?
NO
Check the DC/DC converters and the control lines.
Replace defective parts as required.
1) BU3.3V             (IC9609 etc.)
2) D5.6V               (IC9608 etc.)
3) D5V                  (IC9603 etc.)
4) U5V                  (IC9602 etc.)
5) D3.3V               (IC9605 etc.)
6) M1.8V               (IC9607 etc.)
7) D1.5V               (IC9604 etc.)
8) D1.2V               (IC1509 etc.) 
9) D1.1V               (IC9606 etc.)
10)AT5V                (IC1104 etc.)
11)IF1.8V              (IC1109 etc.)
12)SAT+1.2V         (IC1102 etc.)
13)STB+3.3V         (Q9607 etc.)
14)SD3.3V             (IC8456 etc.) 
15)CPU_A+1.2V     (IC3301 etc.)
16)CIIN+5V            (IC4403 etc.)
17)MT5135+1.1V   (IC4401 etc.)
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 2
The sound is not emitted from the Speaker.
No sound output in all modes?
YES
Do audio signals output from pins [Y30/CPU_AOLRCK, Y31/
CPU_AOBCK, V27/CPU_AOSDATA0] of IC3303 (Digital AV 
decode & Main CPU)?
NO
Check IC3303 and its peripheral circuits.
YES
Do audio signals input to pins [7, 8, 9] of IC2701 (DSP)?
NO
Check the line between IC3303 and IC2701.
YES
Do audio signals output from pins [43/AMP_BCLK, 44/
AMP_LRCLK, 45/AMP_DATA_LR, 47/AMP_MCLK] of IC2701?
NO
Check IC2701 and its peripheral circuits.
YES
Do audio signals input to pins [5, 6, 7, 8] of IC2703 
(SP_AMP)?
NO
Check the line between IC2701 and IC2703.
YES
Do audio signals output from pins [28/OUTML, 30/
OUTPL, 12/OUTPR, 14/OUTMR] of IC2703?
NO
Check IC2703 and its peripheral circuits.
YES
Is AMP_MUTE [pin (21)] of IC2703 at “H”?
NO
Check the line between IC2703 and IC3303 & IC2001 (UCOM).
(Q2701,D2701 etc...)
YES
Do audio signals input to pins [1&2/L-ch, 3&4/R-ch] of 
P2701?
NO
P2701 terminal and the peripheral circuit (L/C filter) are checked.
YES
Check Speaker (right and left) and wire harness.
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 3
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?
In the case of LE740,LE743 series, refer to (A).
In the case of LE741 series, refer to (B).
(B)
(A)
Does SIF signal output from pin (8) of TUNER 
(TU1102)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Does SIF signal input to pin [AM24/CPU_ATV_IF+] of 
IC3303 (Digital AV decode & Main CPU)?
NO
Check the line between TU1102 and IC3303. (Q1102, etc.)
YES
Refer to “The sound is not emitted from the Speaker.”
Does SIF signal output from pin (8) of TUNER (TU1104)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Does SIF signal input to pin [AM24/CPU_ATV_IF+] of IC3303 
(Digital AV decode & Main CPU)?
NO
Check the line between TU1104 and IC3303. (Q1102, etc.)
YES
Refer to “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 – 4
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?
In the case of LE740,LE743 series, refer to (A).
In the case of LE741 series, refer to (B).
(B)
(A)
Do IF signals output to pins [10, 11] of TUNER 
(TU1102)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Do IF signals input to pins [35/IFPGA_INN, 36/
IFPGA_INP] of IC4402 (CI Cont & DTB-T/C Demod)?
NO
Check the line between IC1102 and IC4402.
YES
Do TS signals output to pins [15/DEMOD_TS_DATA0, 
16/DEMOD_TS_SYNC, 17/DEMOD_TS_VAL, 18/
DEMOD_TS_CLK] of IC4402?
NO
Check IC4402 and its peripheral circuits.
YES
Do TS signals input to pins [U30/DEMOD_TSDATA0, 
V30/DEMOD_TSSYNC, V29/DEMOD_TSVAL, U32/
DEMOD_TSCLK] of IC3303 (Digital AV decode & Main 
CPU)? 
NO
Check the line between IC4402 and IC3303.
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
Do TS signals output to pins [19/TS_TUOUT_CLK, 17/
TS_TUOUT_SYNC, 18/TS_TUOUT_VAL, 20~27/
TS_TUOUT_D0~7] of TUNER (TU1104)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Do TS signals input to pins [45/TS_TUOUT_CLK, 46/
TS_TUOUT_SYNC, 47/TS_TUOUT_VAL, 48, 51~57/
TS_TUOUT_D0~7] of IC4402 (CI Cont & DTB-T/C Demod)?
NO
Check the line between TU1104 and IC4402.
YES
Do TS signals output to pins [15/DEMOD_TS_DATA0, 16/
DEMOD_TS_SYNC, 17/DEMOD_TS_VAL, 18/
DEMOD_TS_CLK] of IC4402? 
NO
Check IC4402 and its peripheral circuits.
YES
Do TS signals input to pins [U30/DEMOD_TSDATA0, V30/
DEMOD_TSSYNC, V29/DEMOD_TSVAL, U32/
DEMOD_TSCLK] of IC3303 (Digital AV decode & Main CPU)? 
NO
Check the line between IC4402 and IC3303.
YES
Refer to “The sound is not emitted from the Speaker.”
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