Sharp Aquos LC-22SV6U, Service Manual

Page: 32 / 118

32
LC-22SV6U
TROUBLE SHOOTING TABLE
No
No P
o
wer (P
o
wer LED indicator still in red)
Go to the adjustment process mode
.
Mo
v
e
the cursor to ERR
OR NO RESET
and clic
k on it (to reset to z
e
ro).
T
u
rn
off the po
w
e
r.
Is the po
w
e
r tur
n
ed on again?
1
INCH SIZE
22
MODEL
SV6U
SYSTEM
N358
NTSC PWM FREQ
1DD
P
AL PWM FREQ
1DD
NTSC PWM DUTY
0
P
AL PWM DUTY
0
TV GAIN
OFF
ERR
OR NO RESET
5
V
-CHIP
1
CANADIAN VCHIP
OFF
SV6U VER
1.xx
Note:
This model is equipped with the lamp error detection function that detects the current flo
wing into the fluorescent lamp and protects the bac
klight lamp dr
iv
e circuit.
If a lamp error is detected, the microprocessor interr
upts the unit and the ERR
OR NO
RESET setting will go up
.
When the ERR
OR NO RESET setting has reached "5", the microprocessor tur
ns and
k
eeps off the unit's po
w
e
r.
T
o
resume the po
w
e
r,
tak
e
the abo
v
e procedure to clear the
ERR
OR NO RESET setting.
Check the following points. (1) Backlight lamp (2) Inverter circuit (Inverter PWB, Main PWB and AV/Tuner PWB)F6551, F6552,
F6553, F6554, D6551, D6552, D6553, D6554, Q6551, Q6552, Q6553, Q6554, Q6555, Q6556, Q6557, Q6558, Q6559, Q6560, Q6561, Q6562 and their peripheral parts as well as pin (10) of IC4512 (OFL1).
(3) Lamp error detection circuit (Analog PWB) D3709, D3701, D3702, D3706,
D3707, D3708, Q3701, Q3702, Q3703, Q3705 and their peripheral parts as well as pin (42) of IC3501 (L-ERR).
No or
Wr
ong
Picture
No
No
No
No
Yes
No
Yes
Yes
Yes
Yes
Does the IC801 (VPC) test patter
n
appear
proper
ly?
Does the IC4561 test patter
n appear
proper
ly?
Chec
k the IC801 signal
output line
, IC801 itself
and its per
ipher
al
circuits
.
Are the w
a
v
e
fo
rm
s at
pins (61), (62), (63) and (67) of IC4512 as specified?
Chec
k IC4512 and its
per
ipher
al circuits as
w
ell as the LCD panel
v
oltage and w
a
v
e
fo
rm
.
Are the w
a
v
e
fo
rm
s at
pins (1), (2), (3), (4) and (195) of IC4101 as specified?
Are the w
a
v
e
fo
rm
s at the signal
input pins of IC801 as specified? TV/Composite
,
S Video
…
Pins (71) and (72)
Component
…
Pins (4), (5), (6)
and (75)
Chec
k the IC801 signal
input line
.
Chec
k IC801 and its
per
ipher
a
l circuits
.
Chec
k the related lines
,
IC801 itself and its per
ipher
al circuits
.
Chec
k the IC4601 signal
output line
, IC4601 itself
and its per
ipher
al circuits