Sharp LC-13C3US, Service Manual

Page: 28 / 88

28
LC-13C3U-S
LC-15C3U-S
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
er tur
ned on again?
1
MODEL
A460
INCH SIZE
~
SYSTEM
N358
NTSC PWM FREQ
OCO
P
AL PWM FREQ
OBD
NTSC PWM DUTY
0
P
AL PWM DUTY
0
TV GAIN
OFF
ERR
OR NO RESET
5
PUBLIC MODE
OFF
V
-CHIP
1
CANADIAN VCHIP
OFF
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.
~
13(LC-13C3U-S), 15(LC-15C3U-S)
Check the following points. (1) Backlight lamp (2) Inverter circuit (inverter PWB and main PWB)F6700, F6701, F6702, F6703,
F6704, D6700, D6701, Q6700, Q6701, Q6702, Q6703, Q6704, Q6705, Q6706, Q6707, Q6708, Q6709, Q6710, Q6711, Q6712, Q6713, Q6714 and their peripheral parts as well as pin (34) of IC1201
(3) Lamp error detection circuit (terminal PWB and main PWB)D3600, D3601,
D3602, D3603, D3604, D3605, D3606, D3607, D3608, Q3600, Q3601, Q3602, Q3603, Q3604 and their peripheral parts as well as pin (42) of IC2001
No or
Wr
ong
Picture
Does the IC801 test pattern appear properly?
Does the IC1201 test pattern appear properly?
Check the IC801 signal output line, IC801 itself and its peripheral circuits.
Are the waveforms at pins (10), (1
1), (13),
(15) and (17) of IC1201 as specified?
Check IC1201 and its peripheral circuits as well as the LCD panel voltage and waveform.
Check the related lines, IC801 itself and its peripheral circuits.
Are the waveforms at the signal input pins of IC801 as specified? TV/Composite
Pin (73)
S V
ideo
Pins (71) and (72)
Component
Pins (4), (5), (6)
and (75)
Check the IC801 signal input line.
Check IC801 and its peripheral circuits.
No
No
No
No
Yes
Yes
Yes
Yes