Sharp AQUOS LC-20B5M, Руководство по обслуживанию

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24
LC-20B5M
TROUBLE SHOOTING TABLE
No picture and sound
Chec
k all the settings on the microprocessor'fs adjust process men
u
.
Fluorescent light in tr
oub
le
Are F3701 and F3702 nor
mal?
YES YES
YES YES
YES YES
NO
NO
NO
NO
NO NO
YES YES
NO
Does the load side k
e
ep
nor
mal circuits when F3701
and F3702 are disconnected?
Are F3701, F3702, F6700, F6701, F6702, F6703 and F6704 nor
m
al?
Do Q6702, Q6705, Q6708, Q6711 and Q6714 k
eep
nor
mal circuits?
Chec
k
Q6702, Q6705, Q6708,
Q6711, Q6714 and their per
ipher
al circuits
.
Chec
k S4053 and the
connecting cab
les
.
Chec
k the connecting cab
les
and the per
ipher
a
l circuits of
J3701.
Are pins (10) and (11) of IC1201"H"? Are the oscillation w
a
v
e
s from
the pr
imar
y sides of
T6700
thr
u
T6709
nor
mal?
Chec
k and replace the
fluorescent light.
Chec
k the connecting cab
les
and the per
ipher
al circuits of
Q6700 thr
u
Q6713.
Chec
k that line
, IC1201 and
their per
ipher
al circuits
.
Are +34V
, +9V and +5V on the
secondar
y side output at
T701
nor
mal?
Are +35V
, +9V and +5V on
the secondar
y side output at
T701 nor
mal?
Are pins (14) of IC702 thr
u
IC707 nor
mal? (1.35V
-2.05V)
Chec
k the load side
.
Do Q716, S4053 and the per
ipher
al circuits on the
pr
imar
y side of
T3701 k
eep
nor
mal circuits?
Replace F3701 and F3702.