LC-52XL1E (serv.man3). Adjustment Procedure - Sharp TV Service Manual (repair manual)

lc-52xl1e (serv.man3) service manual
Model
LC-52XL1E (serv.man3)
Pages
20
Size
1.19 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Adjustment Procedure
File
lc-52xl1e-sm3.pdf
Date

Read Sharp LC-52XL1E (serv.man3) Service Manual online

LC-46XL1E/RU, LC-52XL1E/RU
4 – 1
LC46XL1E
Service Manual
 
CHAPTER 4. 
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
Power switched on but no power supplied.
              
Are the power cord and internal harnesses correctly con-
nected?
NO
Reconnect the cables correctly and switch on the power again.
YES
Does F701 function?
NO
Replace F701 and switch on the power again. Does the fuse blow 
out?
YES
NO
YES
Is there a voltage of about 5V at the BU5V output [between pins (20) (+) and (22) (-) of PA]?
YES
NO
Replace R790, D742, 
IC702, R780 and R781.
NO
Is the voltage at C790 
higher than 8V?
YES
Are there voltages of about 13V, 24V and 35V at the UR13V, 
S29V and UR35V outputs, respectively? 
NO
Check D708, Q727, Q726, 
R830, R829, D762, D763, 
Q741, R824, R825, IC704, 
R826, R827 and R828.
Replace Q705, D715, 
IC701, R726 and R721.
YES
Is the relay activated clicking?
NO
Check Q706, Q741, D707, D729 and R776. 
YES
Is there a voltage of about 12V at UR12V [between pins (1) 
(+) and (3) (-) of PL]?
NO
Check Q731, Q742, Q732, D767, D766, R843, R844 and C799.
YES
Is there a voltage of about 380V at C726?
NO
Check Q705, D715, IC701, R726 and R721.
YES
Is there a voltage of about 60V at the INV60V output 
[between pins (1) (+) and (3) (-) of LA]?
NO
Check Z1, Q707, Q708, Q716 and L706.
YES
Is there a voltage of about 10V at the INV10V output 
[between pins (5) (+) and (3) (-) of LA]?
NO
Check IC705, R832, R833, R834 and C813.
LC-46XL1E/RU, LC-52XL1E/RU
4 – 2
 No sound (1) (during the reception of TV broadcasting) 
No audio output during UHF/VHF reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control? ... Set the desired volume.
2) Are headphones connected to HEADPHONE (J1301)? ... Disconnect them.
3) Is ANT-CABLE disconnected or connected improperly? ... Connect it correctly as per the operation manual.
Is the audio signal (L/R) 
sent from pins (28) and 
(27) of IC3701 (MSP)? 
NO
Is the SIF signal 
(ANA_IN1+) sent to pin 
(67) of IC3701 (MSP)?
YES
Check whether +5V and 
+8V are supplied to pins 
(12) and (39) of IC3701 
respectively. Or, check 
peripheral circuits.
(AV-UNIT)
YES
NO
Is the audio signal of pins 
(3) and (5) of IC303 (OP-
AMP) sent properly?
NO
Check SC2704 and P1201 
or peripheral circuits.
Is the S-MUTE signal “L”?
Is the audio signal (SIF) 
sent from pin (1) of CON-
NECTOR (SC2705)?
YES
Check pin (67) of IC3701 
(MSP) and peripheral cir-
cuits.
YES
(TUNER)
NO
Is the audio signal of pin 
(4) of IC301/IC302 
(AUDIO-AMP) sent prop-
erly?
NO
Check HEAD-PHONE 
(J1301) or peripheral 
circuits. 
Is the audio signal (SIF) 
sent from pin (12) of IC201 
(IF-DEMOD)? 
YES
Check CONNECTOR 
(P201) and peripheral cir-
cuits.
YES
NO
Is the audio signal output 
of pins (2) and (4) of P301 
(AUDIO-CONNECTOR) 
normal? 
NO
Check P301 (AUDIO- 
CONNECTOR) and 
peripheral circuits. 
Is the SIF signal sent to 
pins (23) and (24) of 
IC201 (IF-DEMOD)?
YES
Confirm whether +5V is 
supplied to IC201. 
Or, please check the 
peripheral circuit.
YES
NO
Check SP-BOX (right and 
left) and wire harness. 
Is the IF signal sent from 
pin (17) of TUNER 
(TU201)?
YES
Check soldering the termi-
nal and peripheral circuits.
NO
Check whether 5V 
(CONT) and 5V are sup-
plied to pins (1) and (2) of 
TUNER (TU201) respec-
tively.
Check SDA/SCL and AGC 
signal.
YES
Replace TUNER (TU201).
LC-46XL1E/RU, LC-52XL1E/RU
4 – 3
No sound from external input devices (2) -1
                   
                 
                  
No sound from an external input 
device connected to EXT1 
(SCART1).
No sound from an external   
input device connected to 
EXT2 (SCART2).
No sound from an external 
input device connected to 
EXT3.
                   
                 
                  
<EXT1>
Is IN1-L audio signal sent from 
pin (6) of SCART1 terminal 
(J1101) to pin (53) of IC3701 
(MSP)?
Is IN1-R audio signal sent from 
pin (2) of SCART1 terminal 
(J1101) to pin (54) of IC3701 
(MSP)?
YES
<EXT2>
Is IN2-L audio signal sent 
from pin (27) of SCART2 ter-
minal (J1101) to pin (56) of 
IC3701 (MSP)?
Is IN2-R audio signal sent 
from pin (23) of SCART2 ter-
minal (J1101) to pin (57) of 
IC3701 (MSP)?
YES
<EXT3>
Is IN3-L audio signal sent from 
pin (3) of J1201 terminal to pin 
(47) of IC3701? 
Is IN3-R audio signal sent from 
pin (5) of J1201 terminal to pin 
(48) of IC3701?
NO
                 
NO
NO
Check pins (6) and (2) of 
SCART1 and connection to an 
external input device. 
Check pins (27) and (23) of 
SCART2 and connection to 
an external input device.
Check pins (3) and (5) of EXT3 
(J1201) and connection to an 
external input device. 
Is the audio signal properly sent from pins (28) and (27) of IC3701?
NO
YES
Check IC3701 or peripheral circuits. 
Is the audio signal of pins (1) 
and (7) of IC303 (OP-AMP) 
sent properly?
NO
Check IC303 or peripheral circuits.   
YES
Is the audio output signal of 
pins (13) and (16) of IC302/
IC301 (MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), 
HEADPHONE and peripheral circuits. 
YES
Check CONNECTOR (P301) 
and SP-BOX (right and left). 
LC-46XL1E/RU, LC-52XL1E/RU
4 – 4
No sound from external input devices (2) -2
                          
                         
No sound from EXT4 (AUDIO) connect-
ing an external input device.
No sound from EXT5 (AUDIO) connect-
ing an external input device.
                          
                         
<EXT4>
Is D-SUB-L audio signal sent from J2702 
to pin (15) of IC2704?
Is D-SUB-R audio signal sent from J2702 
to pin (2) of IC2704?
<EXT5>
Is HDMI-L audio signal sent from J2701 
to pin (14) of IC2704?
Is HDMI-R audio signal sent from J2701 
to pin (5) of IC2704?
YES
YES
Is D-SUB-L audio signal sent to pin (50) 
of IC3701?
Is D-SUB-R audio signal sent to pin (51) 
of IC3701?
Is HDMI-L audio signal sent to pin (50) of 
IC3701?
Is HDMI-R audio signal sent to pin (51) of 
IC3701?
NO
Check output of pins (13) and (3) of 
IC2704 and peripheral circuits.
 
YES
YES
Is the audio signal properly sent from pins (28) and (27) of IC3701?
NO
Check IC3701 or peripheral circuits. 
YES
Is the audio signal of pins (1) and (7) of 
IC303 (OP-AMP) sent properly?
NO
Check IC303 or peripheral circuits. 
YES
Is the audio output signal of pins (13) and 
(16) of IC302/IC301 (MAIN-AMP) nor-
mal?
NO
Check IC302/IC301 (MAIN-AMP), 
HEADPHONE and peripheral circuits. 
YES
Check CONNECTOR(P301) and 
SP-BOX (right and left).
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