NO
YES
YES
YES
YES
NO
FLOWCHART NO. 2-2
KEY-IN TROUBLESHOOTING
Key-in input is not received.
FLOWCHART NO. 2-1
TV TROOUBLESHOOTING TABLE
Set not operating
Is the key switch in good contact ?
Check the switch contact.
Is there short-circuit in the key input ?
Check key lines to input of IC1001.
NO
YES
NO
Are signals received at pins (74) and
(75) of IC1001 when the key is
activated ?
Check IC1001 and switches for poor
soldering.
Check IC7701 and signal line of serial
datas, serial clock and ready (L).
NO
YES
YES
NO
FLOWCHART NO. 2-3
INFRARED R/C TROUBLESHOOTING
No operation is possible from the
infrared remote control.
Check R1074, D1006 and GND
lines.
NO
NO
NO
YES
Is "L" pulse given out of pin (1) of the
receiver and received at pin (79) of
IC1001, when the infrared remote
control is activated ?
Does the infrared remote control
function ?
Is 5V applied at pin (2) of the remote
control receiver ?
Replace the infrared remote control
as required.
Check pin (79) of IC1001. and/or
receiver.
Is fluorescent lighting enough away
from the set ?
YES
Reposition the set not to be exposed
to strong light.
YES
Is there short-circuit in the key input
or IC1001 ?
Check key input terminals.
Check IC1001, and signal line of
serial datas, serial clock and ready
(L).
Is AC cord connected ?
Is 350V DC applied to
C704 ?
Connect AC cord.
NO
NO
AC cord broken.
Is F1701 blown ?
YES
Is 19V DC applied to
pin (4) of IC701 ?
Check R702, R703,
Q701, D714, Q702,
R717, R714, D713 and
IC701.
NO
Is AC applied to line
between (1) and (2) of
A-connector ?
YES
NO
Does pulse waveform
exist at line between
(2) and (3) of IC701 ?
Is 350V DC applied to
line between (2) and
(3) of IC701 ?
YES
Check secondary
circuits of D751~D754,
D764 and
FB751~FB756.
NO
Pins (7), (5)
of T701
open.
YES
Check IC701
and adjacent
parts.
NO
Check D701
L1701 and
L1702.
YES
Check D701
line between
(3) and (2) of
IC701, L1701
and L1702.
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