28
LC-13B8U-S
LC-15B8U-S
LC-15B9U-SM
TROUBLE SHOOTING TABLE
(Continued)
Check the secondary
load of T701.
Is pin (10) of IC702 and
IC701 at "H"?
Check the load of IC702
and IC701 and its
peripheral circuits.
Is the primary
oscillation wave of
T701 as specified?
Are the secondary
outputs of T701 +5V, -7V,
-12V, +35V and +9V?
Is there DC 12V input at
T701 and pin (8) of IC703?
Is the output voltage of
IC702 and IC701 as
specified?
Check the load of IC701
thru IC703.
Check T7701, IC7705
and their peripheral
circuits.
Check the primary side
of T701, IC703 and its
peripheral circuits.
Disconnect F7701. Is
the load short-circuited?
Is pin (187) of IC801 at
"H" or pulse?
Check the line in
question, IC801 and its
peripheral circuits.
Check the primary side
of T701, Q716 and its
peripheral circuits.
Check pin (72) of
IC2001, pin (2) of
SC2003 and pin (2) of
P3404.
No video and audio output (no po
wer)
No fluorescent lamp light-up
No
No
No
No
No
No
No
Are Q6700, Q6701,
Q6707, Q6708 free
from short-circuit?
Check Q6700, Q6701,
Q6707, Q6708 and their
peripheral part.
No
No
Are F7701 as specified?
Replace F7701.
Is F6700, F6702 normal?
Replace F6700, F6702.
Yes
Replace and check the
fluorescent lamp.
Yes
Yes
Is the oscillation
waveform of the primary
side of T6701-T6704
normal?
Check the peripheral
parts of Q6700, Q6701,
Q6707, Q6708 and the
connecting cable.
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chec
k the microprocessor's adjustment process men
u f
o
r wrong settings
.
Summary of Contents for LC-13B8U-S
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