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This LCD TV can use RS232 download connector to download new software or control this
LCD TV by RS232 commands. The RS232 transceiver U3 is used to transmit/receive RS232
signals between MCU and download connector.
5. IR receiver:
The front IR receiver accepts IR signal from front side direction. The carrier frequency is
38kHz.
1.5. Audio amplifier – TPA3100D2
Mute :
Low = output enabled
High = output high-Z
VREG(4V)
R263
10K
R264
1K
7
AMP_PD
Shutdow n :
Low = disabled
=> Speaker Off
15V_AUD
High = operational => Speaker On
C349
+
C348
0.1U K
220U 25V
<Spec>
1
NC
C355 0.47U Z
2
11
AUDIO_R_OUT
RINN
C357 0.47U Z
3
RINP
4
AGND
C358 0.47U Z
5
LINP
C359 0.47U Z
6
11
AUDIO_L_OUT
LINN
7
NC
8
GAIN0
GAIN0
9
GAIN1
GAIN1
VREG(4V)
10
MSTR/SLV#
11
SY NC
VREG(4V)
12
NC
Gain modify
R273
R274
100K
0
GAIN=26 dB
GAIN0
GAIN1
R277
R276
100K
0
L80
Z120
L81
Z120
L82
1 KHz Sine W ave
Audio Output / Speaker : 8 ohm/15W
Gain 1
Gain 0
Amplifier Gain
Audio Input ; Vrms
0
0
20
1.06 Vrms
0
1
26
0.524 Vrms
1
0
32
0.266 Vrms
1
1
36
0.173 Vrms
The TPA3100D2 is a class-D audio amplifier which can provide two 10W, 8 ohm speaker
under 15V DC supplier. It has front gain which can compensate the lower level signal from audio
processor. The circuit around NJM2769BM is the ear phone amplifier which is output via side
AV connector.
Audio Amplifier Circuit
VREG(4V)
R258
10K
PHONE_DET 1,7
VREG(4V)
DN6
BAV70LT1G
A1
A2
R259
10K
R260
NM_0
Q23
B
R261
4.7K
AMP_MUTE 7
2N3904S
R262
100
L68
33U K
L69
C342
0.1U K
C344
0.47U Z
C346
C345
0.1U K
NC
L70
33U K
L71
C351
C352
0.22U K
0.22U K
15V_AUD
C354
220U 25V
36
1
NC
35
C356 0.1U K
PVCCR
34
PVCCR
33
PGNDR
U25
32
PGNDR
31
C360 1U K
VCLAMPR
30
C367 1U K
VCLAMPL
TPA3100D2RGZR
29
PGNDL
28
PGNDL
C364
220U 25V
27
1
PVCCL
26
C366 0.1U K
PVCCL
25
NC
15V_AUD
C368
C369
R275
0.22U K
0.22U K
3A
L75
33U K
100K
L76
Z120
C377
0.1U K
C380
0.47U Z
C382
0.1U K
L78
33U K
L79
Z120
3A
Z120
L83
Z120
Audio Input : Vp-p
3 Vp-p
1.482 Vp-p
0.753 Vp-p
0.489 Vp-p
AMP_MUTE
SPEAKER
H
ON
L
OFF
C341
470P K
3A
TP178
Z120
J14
C343
1
220P J
1
2
2
3
3
C347
2K61196103
3A
220P J
TO R Speaker
Z120
TP179
C350
470P K
+15V
D9
L72
3A
K
A
Z120
<Spec>
SS24-LF
2
AUDIO_L _PHONE
<Spec>
2
AUDIO_R_PHONE
TP180
C371
470P K
C378
J15
220P J
1
1
2
2
C383
2K61196102
220P J
TO L Speaker
TP181
C385
470P K
107
7
PHONE_MUTE
R265
10K
+
C353
10U M
Low: Mute On
High: Mute Off
C393 1U K
R266
0
1
2
R267
C361
100U 16V
C362
<Spec>
R271
NC
10K
R268
R269
4.7
820
U27
C365
0.1U K
NJM2769BM-TE2
C394 1U K
R272
0
L74
C370
+
+
C372
C374
0.1U K
R270
100U 16V
NC
10K
<Spec>
1
2
R278
C379
100U 16V
<Spec>
R279
4.7
R280
820
C384
0.1U K
0
L73
Z200
PHONE_L 1
C363
560P K
+5VA
Z200
K
A
D10
RB551V-30
0
L77
Z200
PHONE_R 1
C381
560P K
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