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TV TROOUBLESHOOTING TABLE
Set not operating
.
I
Is AC cord connected ? __)
YES
Is AC applied to line
between (1) and (2) of
I
I
I
Is 350V DC applied to
Is F1701 blown ?
FLOWCHART NO. 2-1
,
NO
Connect AC cord.
Is the key switch in good contact ?
Is there short-circuit in the key input ?
AC cord broken.
I
Are signals received at pins (1) and (2)
of ICI001 when the key is activated ?
Check IC7701 and signal line of serial
Does the infrared remote control
a
s
Is 5V applied at pin (1) of the remote
control receiver ?
Is "L" pulse given out of pin (1) of the
receiver and received at pin (5) of
Is fluorescent lighting enough away
from the set ' ?
Is there short-circuit in the key input
or ICI001 ?
I
Check ICI 001, and signal line of
serial datas, serial clock and ready
KEY-IN TROUBLESHOOTING
Key-in input is not received.
NO
Check the switch contact.
YES
Check ICI001 (iX2978CE) and
switches for poor soldering.
Check key lines to input of ICl 001.
INFRARED R/C TROUBLESHOOTING
No operation is possible from the
infrared remote control.
Replace the infrared remote control
r
e
q
u
i
r
e
d
I
Check the 5V and GND lines.
I
YES
Check pin (5) of IClOOl. and/or
Reposition the set not to be exposed
to strong light.
YES
Check key input terminals.
I
I
YES
FLOWCHART NO. 2-2
FLOWCHART NO. 2-3
.
1
I
I
I
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