LC-19D1EWH (serv.man5). Troubleshooting Table — Sharp TV Service Manual (repair manual)

Model
LC-19D1EWH (serv.man5)
Pages
24
Size
1.14 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Troubleshooting Table
File
lc-19d1ewh-sm5.pdf
Date

View Sharp LC-19D1EWH (serv.man5) Service Manual online

LC-19D1E/S-BK/WH
4 – 1
LC19D1E-BK
Service Manual
 
CHAPTER 4. 
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No power supplied (Front LED does not turn on). Power switched on but no power supplied. (Front LED does not turn Red 
Green )
YES
Are the power cord connector correctly connected to the body?   
NO
Reconnect the power cord correctly and switch on the power 
again.
YES
Remove CN2 connector of POWER unit.  When you input 3.3V to 
pin(9) of CN2 connector , check whether UR12V are outputted to 
pin(13) to (15).
NO
Exchange the power supply units.
YES
Check whether there is any loose connection of a connector 
(CN2 and SC1204).
YES
Is the AC-CTL signal (H) input to pin (9) of CN2 connector?
NO
Is the signal of AC-CTL:H output from 35 pins of IC2002(SUB-
MICON) in the MAIN UNIT?
YES
NO
Check a power circuit of IC2002 and periferal circuit.
Please exchange IC2002 when still not repaired.
Is BU3.3V output to connector P101 (1) pin of the R/C unit and 
the P2003 (1) pin of the MAIN unit ?
NO
Please check whether IC2004 and BU3.3V line short-circuit.
(IC2002,IC2001,IC2003,IC2006,P2003-1pin,BU3.3V-line)
YES
Please check of POWER-LED (D103) of a R/C unit, Q101, Q102, 
or peripheral circuits.
Power supply (troubleshooting): A power supply does not come to each main circuit or IC. (1)
                              
The power supply of TUNER (TU501) does not operate.
                              
Checklist
1) The check of the front page POW (1) is completed. 
• • • UR12V is output to SC1204 (MAIN-PCB).
(If UR12V is not output, confirm the POW(1) again and repair.)
2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.
(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)
3) Refer to attached sheet Power-Block diagram.
                              
Is B5V supplied to pin(1) of TUNER (TU501) ?
NO
Check whether regulator IC of IC504 and IC505 is normal.
YES
Is B5V(CONT) supplied to pin(11) of TUNER (TU501) ? 
YES
Check regulator IC of IC505. and check whether the POWER-
CTL signal is inputted into pin(7) of IC505.
NO
Is UR12V supplied to pin(2) of IC505 (5.6V-REG) ?
YES
Check the the soldering confirmation of IC207 or exchange it.  
NO
Check whether other pins of TUNER (TU501) to be short-cir-
cuited.
If normal,exchange TUNER(s).
LC-19D1E/S-BK/WH
4 – 2
Power supply (troubleshooting): A power supply does not come to each main circuit or IC. (2)
                                            
The power supply of a VIDEO system/IC801 (DVP) does not 
operate.
                                            
Checklist:
1) The check of the front page POW (1) is completed.
• • • UR12V is output to SC1204 (MAIN-PCB).
(If UR12V is not output, confirm the POW(1) again and repair.)
2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.
(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)
3) Refer to attached sheet Power-Block diagram.
                                            
Is B1.5V supplied to pin(D12) of IC801 (DVP) ?
NO
Check whether B1.5V is output from pin(6) of IC705.
YES
NO
Check whether POWER-CTL signal is input to pin(4) of IC705 
(REG).
YES
Is B12V supplied to pin(5) of IC705 (REG) ?
YES
Exchange IC705 (REG).
Is B3.3V supplied to pin(R19)(D5) of IC801(DVP) ?
NO
Check whether B3.3V is output from pin(3) of IC703 (REG). 
YES
NO
Check whether UR 12V-CTL signal is input to pin(7) of 
IC703(REG).
YES
Is B12V supplied to pin(2) of IC703 (REG) ?
YES
Exchange IC703 (REG).
Is B3.3V supplied to pin(1)(19) of IC9201 (RSDS-TR) ?
NO
Check whether B3.3V is output from pin(3) of IC703 (REG). 
YES
NO
Check the soldering of IC801 and IC703 or exchange it. 
Check whether UR 12V-CTL signal is input to pin(7) of 
IC703(REG).
YES
Is B12V supplied to pin(2) of IC703 (REG) ?
YES
Exchange IC703 (REG).
LC-19D1E/S-BK/WH
4 – 3
Power supply (troubleshooting): A power supply does not come to each main circuit or IC. (3)
                                            
The power supply of a AUDIO system does not operate.
                                            
Checklist:
1) The check of the front page POW (1) is completed. 
• • • UR12V is output to SC1204 (MAIN-PCB).
(If UR12V is not output, confirm the POW(1) again and repair.)
2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.
(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)
3) Refer to attached sheet Power-Block diagram.
                                            
Is UR12V supplied to pin(47)(46)(39)(38) of IC303(P-AMP) ?
NO
Check the UR12V line from pin (13-15) of SC1204. 
YES
Is B3.3V supplied to pin(13)(26) of IC302(A-CODEC) ? 
NO
Check the soldering of IC302 or  Is B3.3V output from pin(3) of 
IC703(REG)?
YES
NO
Is UR12V supplied to pin(7) of IC703(REG) ? 
Check the soldering of IC703(REG) or exchange it. 
Is B9V supplied to pin(14) of IC301(A-SEL) ? 
NO
 Is B3.3V output from pin(5) of IC702(REG)?
YES
NO
Check the soldering of IC301(A-SEL) or exchange it. 
Check the soldering of IC702(REG) or exchange it
LC-19D1E/S-BK/WH
4 – 4
Power supply (troubleshooting): A power supply does not come to each main circuit or IC. (4)
                                            
The power supply of a PANEL system does not operate.
                                            
Checklist:
1) The check of the front page POW (1) is completed. 
• • • UR12V is output to SC1204 (MAIN-PCB).
(If UR12V is not output, confirm the POW(1) again and repair.)
2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.
(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)
3) Refer to attached sheet Power-Block diagram.
                                            
Is B12V output from pin(6) of Q702(SW)? 
NO
Check the soldering of Q702(SW) or exchange it. 
YES
Is VGL(-7V)/VGH (28V) output from pin(1)/(3) of IC704(SW-
REG)?
NO
Check the soldering of Q704(SW-REG) or exchange it. 
YES
Is VLSB14.6V output from pin(3) of IC701 (VLSB14.6V-REG)? 
NO
Check the soldering of IC701(VLSB12V-REG) or exchange it.
YES
Is VH24/VH56/VL 56/VL24 output from pin(7)/(1)/(8)/ (14) of 
IC1001(OP-AMP)?
NO
Check the soldering of IC1001(OP-AMP) or exchange it.
YES
Is COM-BIAS output (4.2V) from pin(7) of IC9202(COM-BIAS)?
NO
Check the soldering of IC9202(COM-BIAS) or exchange it. 
YES
Is each voltage supplied to SC9201(CONN) ?
(VLSB14.6V,VGH,VGL,COM-BIAS)
NO
Check the soldering of SC9201(CONN) or exchange it.
YES
Check the FPC of PANEL or exchange PANEL-MODULE.
Page of 24
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