DOWNLOAD Sharp LC-42XD1E (serv.man5) Service Manual ↓ Size: 1.13 MB | Pages: 19 in PDF or view online for FREE

Model
LC-42XD1E (serv.man5)
Pages
19
Size
1.13 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Troubleshooting Table
File
lc-42xd1e-sm5.pdf
Date

Sharp LC-42XD1E (serv.man5) Service Manual ▷ View online

     LC-42XD1E/RU
4 – 1
LC-42XD1E
Service Manual
 
CHAPTER 4. 
TROUBLESHOOTING TABLE
[1] TROBLESHOOTING TABLE
Turn on AC source.
                                            
Check AC input and output connector. Are they ok?
No
Insert connectors correctly or change them.
Turn on again.
Yes
Check F7001, R7805, R7901. Are they ok?
No
Change F7001, R7805, R7901. Turn on again.
Does fuse open again?
Yes
No
Yes
Check voltage of C7912. Does it equal 15V?
Yes
                    
No
Check IC7901, R7920, R7921.
Check BD7001, D7803, Q7801, Q7612, Q7602, 
Q7901, IC7801, IC7604, IC7901.
Is BU5V (PA pin21+ and pin22-) output 5V?
Is UR5V (PA pin15+ and pin16-) output 5V?
Is UR37V (PA pin1+ and pin2-) output 35V?
No
Check IC7901, Q7901, D7951, L7951, C7270, C7272, D7271, 
D7272, Q7270.
Yes
Is P-con1 (PB pin1 and pin3) signal correct?
No
Check PB (pin1 and pin3), Q7240, Q7241.
Yes
Is UR13V (PA pin6+ and pin7-) output 13V?
Is S24V (PC pin3+ and pin5-) output 25.5V?
No
Check D7180, IC7150, D7150, L7150, D7240, IC7241, L7241.
Yes
Is LCD-POW (PB pin8 and pin13) signal correct?
NO
Check PB (pin8 and pin3), Q7112,Q7121.
YES
Is UR 12V (PL pin2+ and pin3–) output 12V?
NO
Check Q7104.
Yes
Is P-con2 (PB pin2 and pin3) signal correct?
No
Check PB (pin2 and pin3), Q7309, IC7304.
Yes
Is voltage of C7800 400V?
No
Check IC7801, L7802, Q7801, D7803.
Yes
Is INV24V (LD pin5+ and pin6-) output 24V?
No
Check R7805, IC7604, Q7602, Q7612, D7200, D7201, L7200.
LC-42XD1E/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 cir-
cuits. 
Is the audio signal (SIF) 
sent from Q210 (Buffer)? 
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 
Q203 (AMP)?
YES
Confirm whether +8V is 
supplied to Q203.
Or, please check the 
peripheral circuit.
YES
NO
Check SP-BOX (right and 
left) and wire harness. 
Is the SIF signal sent from 
pin (13) of TUNER 
(TU201)?
YES
Check soldering the termi-
nal and peripheral circuits.
NO
Check whether 5V (ANT) 
and 5V are supplied to 
pins (4) and (10) of 
TUNER (TU201) respec-
tively. Check SDA/SCL 
and AGC signal.
YES
Replace TUNER (TU201).
     LC-42XD1E/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 (J1201) and 5 
(J1201) of EXT3 and connec-
tion 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),
SP-BOX (right and left). 
LC-42XD1E/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), 
SP_substrate (D790WJ/D791WJ) and 
SP-BOX (right and left). 
Page of 19
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Sharp LC-42XD1E (serv.man5) Service Manual ▷ Download

  • DOWNLOAD Sharp LC-42XD1E (serv.man5) Service Manual ↓ Size: 1.13 MB | Pages: 19 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp LC-42XD1E (serv.man5) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp LC-42XD1E (serv.man5) LCD. Information contained in Sharp LC-42XD1E (serv.man5) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.