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Circuits to be checked:
NO NORMAL SOUND
• Sound control circuit.
• Sound out circuit.
• SIF circuit.
• S-convertor.
Is audio output terminal J451
No
normal.
Check TV sound.
Change the sound system.
Is sound normal?
No
Yes
Is there audio
signal at pin
(29), (31) of
IC451?
No
Yes
Set the sound
system in
position.
Check IC201,
If problem,
NICAM unit,
check IC201
tuner and its
and its
peripheral
peripheral
circuits.
Check IC451
and its
peripheral
circuit.
Yes
Is there audio signal at pins (6), (7) of
IC303?
No
Yes
Check IC301,
Set Sound-Volume
IC302, IC303
at maximum. Do
peripheral
pins (19), (20),(22)
circuit.
of IC303 work?
No
Yes
Check IC303.
Is there audio
Is there audio
signal at pins (1)
signal at pins (2),
of IC1301?
(4) of IC1301?
No
Yes
Yes
No
Check IC1305
Check IC1301.
Check IC1304
and its
And check
and its
peripheral
speaker
peripheral
circuit.
connector (SA),
circuit.
(SB) and (SS).
NO SPECIFIC COLOUR
Is only RF signal's colour abnormal?
Check TU201,
IC201, IC451 and
their peripherals.
Set Colour
control.
Fix cotrol to
coloured
system.
NTSC3.58:
Check X802, pin
(10) of IC801 and
their peripherals.
Is SCP signal waveform at pin (2) of
IC801 proper?
Yes
PAL, SECAM,
NTSC4.43:
Are signal waveforms at TP801
Check X801, pin
and TP802 proper?
No
(8) of IC801 and
their peripherals.
Yes
Check IC803 and
No
Are waveforms at pins (29) and
its peripherals.
(30) of IC803 proper?
Yes
Check IC801
and IC4902.
Yes
No
D
NO COLOUR
Turn on Colour control. Does
Yes
colour appeart?
No
Turn on Colour system forced
Yes
switch. Does colour appear?
No
Is chroma input level of IC801
pin (13) proper?
Yes
No
Check Q803,
IC451, IC5461
and their
No
peripherals.
Is FBP signal waveforms at pin
(25) of IC801 proper?
Yes
No
Check D1606
Check
and its
IC801.
peripherals.
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