Sharp LC-15L1US, Service Manual, Page: 20 / 150

20
LC-15L1U-S
TROUBLE SHOOTING TABLE
(Continued)
No picture and no sound at all
(When using batter
y)
Chec
k that micr
ocomputer adjustment pr
ocess men
u is set correctl
y
.
Is F9001 normal?
Replace F9001.
YES YES
YES YES YES YES YES
YES YES
NO
NO
NO NO
NO NO NO NO
No po
wer (Normal operation with A
C
adapter)
Is batter
y v
oltage (1.8-2.2V) present at pin (94) of IC2001?
Is temper
ature detection v
oltage (0.5-1.8V) present at pin (93) of IC2001?
Is batter
y detection of pin (68) of IC2001 at "L" le
v
el?
Are pins (2) and (4) of Q3806 at "L" le
v
el?
Chec
k IC2011, F9001, batter
y and their per
ipher
ies
.
Chec
k IC2011, batter
y and their per
ipher
ies
.
Chec
k batter
y and their per
ipher
ies
.
Chec
k Q3801, Q3802 and their per
ipher
ies
.
Chec
k Q3806.
No operation with batter
y
Is loaded side shor
t-
circuited when F9001 is remo
v
ed?
Are T3701
secondar
y
o34V
, +9V
,
+5V and -11V nor
mal?
Is oscillation w
a
v
e
fo
rm
nor
mal at
T3701
pr
imar
y?
Chec
k T3701
secondar
y loading.
Chec
k P9004
per
ipher
y and
connector cab
le
.
Chec
k S4050 and
connector cab
le
.
Are Q3806 and Q3801 nor
mal?
Are T3701
pr
imar
y
per
ipher
y,
Q3703,
Q3705 and S4050 shor
t-circuited?