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IC Block Diagrams
IC501 < Vertical Output > LA78040/TDA9302H
-
AMP
+
Pump
Up
1
2
3
4
IC3701 < Audio Control / Surround > NJW1142MP
MONa
5
1
IN 1a
IN 2a
2
SEL
IN 3a
3
IN 4a
4
IN 1b
30
IN 2b
29
SEL
IN 3b
28
IN 4b
27
26
MONb
Service Information
I Protection Circuit
This TV set has a built-in power supply protection circuit.
It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormality
occurs during TV reception, the TV set goes to the stand-by mode.
When an abnormality occurs during TV reception, it causes pin 27 of the CPU to go continually Low(less than
0.75V) for about one second. The CPU detects that this has occurred and outputs the signal from pin 31 to
switch off the power supply lines.
Releasing the protective circuit and restoring power supply
To release the protective circuit and restore power supply, turn the power to the TV set OFF and then ON again
via either the main power switch or the ON-OFF button on the remote control. This will work only if the power
supply trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot be
restored and the circuit will have to be repaired.
Thermal
Protection
5
6
7
SR-FIL
AGC
20
VOL 1
NJRC
ORIGINAL
SURROUND
AGC
SIMULATED
STEREO
VOL 1
TONE Ha
TONE La
6
7
8
VOL 2
TONE
&
VOL 2
TONE
24
23
TONE Hb
TONE Lb
-7-
LINEa
OUT a
10
9
IIC BUS
INTERFACE
BIAS
21
22
17
VREF
OUT b
LINEb
13
SDA
14
SCL
11
CVa
12
CVb
19
CTH
18
CTL
25
CSR
15
GND
16
V+
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