25
LC-37HV4E
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-37HV4E
Page 26: ...26 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H CHASSIS LAYOUT ...
Page 27: ...27 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 33: ...LC 37HV4E 33 6 5 4 3 2 1 A B C D E F G H Ë Ë Ë Ë Ë R C LED Unit Display ...
Page 34: ...34 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 1 9 Display ...
Page 35: ...35 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 36: ...36 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 2 9 Display ...
Page 37: ...37 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 38: ...38 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 3 9 Display ...
Page 39: ...39 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 40: ...40 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 4 9 Display ...
Page 41: ...41 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 42: ...42 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 5 9 Display ...
Page 43: ...43 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 44: ...44 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 6 9 Display ...
Page 45: ...45 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 46: ...46 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 7 9 Display ...
Page 47: ...47 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 48: ...48 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 8 9 Display ...
Page 49: ...49 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 50: ...50 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë MAIN Unit 9 9 Display ...
Page 51: ...51 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 52: ...52 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë Ë Ë Ë Ë AUDIO Unit 1 2 Display ...
Page 53: ...53 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 54: ...54 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë Ë Ë Ë Ë AUDIO Unit 2 2 Display ...
Page 55: ...55 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 56: ...6 5 4 3 2 1 A B C D E F G H LC 37HV4E 56 Ë Ë Ë Ë Ë INVERTER 1 Unit Display ...
Page 57: ...LC 37HV4E 57 6 5 4 3 2 1 A B C D E F G H Ë INVERTER 2 Unit Display ...
Page 58: ...6 5 4 3 2 1 A B C D E F G H LC 37HV4E 58 Ë Ë Ë Ë Ë INVERTER 3 Unit Display ...
Page 59: ...LC 37HV4E 59 6 5 4 3 2 1 A B C D E F G H Ë INVERTER 4 Unit Display ...
Page 60: ...60 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë Ë Ë Ë Ë Power Unit Display ...
Page 61: ...61 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 62: ...6 5 4 3 2 1 A B C D E F G H LC 37HV4E 62 Ë KEY Unit Display ...
Page 65: ...65 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 68: ...68 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H MAIN Unit Side B Ë Ë Ë Ë Ë Display ...
Page 69: ...69 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 72: ...72 LC 37HV4E 8 7 10 9 6 5 4 3 2 1 A B C D E F G H AUDIO Unit Component Side Ë Ë Ë Ë Ë Display ...
Page 73: ...73 LC 37HV4E 17 16 19 18 15 14 13 12 11 10 ...
Page 84: ...6 5 4 3 2 1 A B C D E F G H LC 37HV4E 84 Ë Ë Ë Ë Ë Display POWER Unit Component Side ...
Page 85: ...LC 37HV4E 85 6 5 4 3 2 1 A B C D E F G H Ë Ë Ë Ë Ë Display POWER Unit Wiring Side ...