25
LC-37HV4M
LC-37HV4H
No sound comes out. (Connect to the AVC System and check.)
Is power supplied to each
IC in the audio unit?
Is an audio signal appearing
at pin (8) (L-IN) and pin (10)
(R-IN) of P3802?
YES
Is an audio signal appearing
at pins (10) and (14) of
IC3812 (Audio Output)?
YES
YES
YES
YES
NO
Check around the
power regulator circuit
(IC3809, IC3810).
NO
Is an audio signal
appearing at pins (13)
and (20) of SC2202 in
the main unit?
NO
Check for output from the
AVC system side.
NO
Are Q3812 and Q 3813
(MUTE Circuits)
operating?
Is an audio signal appearing
at pins (24), (27), (28) and
(31) of IC3812 (Audio
Output)?
YES
Check if RY3801 (for
Internal/External switching) is
operating properly.
NO
NO
Check D3828-D3831
for short-circuiting and
check the circuits
around IC3812.
NO
Check IC3801, IC3803,
IC3804-IC3807, and
IC3811 for I/O signals.
Check around Q2012 and Q2014 and check the
wire connected between the main unit and
audio unit.
The whole screen is whitish (LCD power supply)
Disconnect the FFC from CN4101,
CN4102 and CN4601-CN4604.
(Otherwise it may cause the panel to get
broken.)
Check the power supplies.
Check the power supplies to CN4101
and CN4102 in particular.
YES
Is the voltage of R4114 around 6V?
YES
Check the I/O voltages of IC4103,
IC4105 and IC4106.
Check the performance of Q4101
and Q4112 and check the
resistances around IC4102.
TROUBLE SHOOTING TABLE (Continued)
Summary of Contents for AQUOS LC-37HV4M
Page 26: ...26 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H CHASSIS LAYOUT ...
Page 27: ...27 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 33: ...33 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë Ë Ë Ë Ë R C LED Unit Display ...
Page 34: ...34 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 1 9 Display ...
Page 35: ...35 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 36: ...36 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 2 9 Display ...
Page 37: ...37 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 38: ...38 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 3 9 Display ...
Page 39: ...39 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 40: ...40 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 4 9 Display ...
Page 41: ...41 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 42: ...42 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 5 9 Display ...
Page 43: ...43 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 44: ...44 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 6 9 Display ...
Page 45: ...45 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 46: ...46 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 7 9 Display ...
Page 47: ...47 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 48: ...48 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 8 9 Display ...
Page 49: ...49 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 50: ...50 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë MAIN Unit 9 9 Display ...
Page 51: ...51 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 52: ...52 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë Ë Ë Ë Ë AUDIO Unit 1 2 Display ...
Page 53: ...53 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 54: ...54 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë Ë Ë Ë Ë AUDIO Unit 2 2 Display ...
Page 55: ...55 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 56: ...6 5 4 3 2 1 A B C D E F G H 56 LC 37HV4M LC 37HV4H Ë Ë Ë Ë Ë INVERTER 1 Unit Display ...
Page 57: ...57 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë INVERTER 2 Unit Display ...
Page 58: ...6 5 4 3 2 1 A B C D E F G H 58 LC 37HV4M LC 37HV4H Ë Ë Ë Ë Ë INVERTER 3 Unit Display ...
Page 59: ...59 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë INVERTER 4 Unit Display ...
Page 60: ...60 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë Ë Ë Ë Ë Power Unit Display ...
Page 61: ...61 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 62: ...6 5 4 3 2 1 A B C D E F G H 62 LC 37HV4M LC 37HV4H Ë KEY Unit Display ...
Page 65: ...65 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 69: ...69 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 73: ...73 17 16 19 18 15 14 13 12 11 10 LC 37HV4M LC 37HV4H ...
Page 85: ...85 6 5 4 3 2 1 A B C D E F G H LC 37HV4M LC 37HV4H Ë Ë Ë Ë Ë Display POWER Unit Wiring Side ...