22
LC-20B2UA
LC-20B2UB
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
ned on again?
1
INCH SIZE
20
MODEL
B2U
A
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
V
-CHIP
1
CANADIAN VCHIP
OFF
B2U
A
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 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, 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 patter
n appear
proper
ly?
Does the IC1201 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
rms at
pins (10), (11), (13),
(15) and (17) of IC1201
as specified?
Chec
k IC1201 and its
per
ipher
al circuits as
w
ell as the LCD panel
v
oltage and w
a
v
e
fo
rm
.
Chec
k the related lines
,
IC801 itself and its
per
ipher
al circuits
.
Are the w
a
v
e
fo
rms at the signal
input pins of IC801 as specified?
TV/Composite
…
Pin (73)
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
al circuits
.
No
No
No
No
Yes
Yes
Yes
Yes
Summary of Contents for Aquos LC 20B2UB
Page 27: ...27 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 INVERTER B Unit INVERTER A Unit ...
Page 31: ...31 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM ËCONTROL and RC LED Unit ...
Page 32: ...32 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 1 5 ...
Page 33: ...33 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 34: ...34 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 2 5 ...
Page 35: ...35 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 36: ...36 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 3 5 ...
Page 37: ...37 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 38: ...38 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 4 5 ...
Page 39: ...39 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 40: ...40 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 5 5 ...
Page 41: ...41 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 42: ...42 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë ANALOG Unit 1 2 ...
Page 43: ...43 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 44: ...44 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë ANALOG Unit 2 2 ...
Page 45: ...45 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 46: ...46 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H Ë INVERTER A Unit ...
Page 47: ...47 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H Ë INVERTER B Unit ...
Page 49: ...49 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H DIGITAL Unit Side B CONTROL Unit Side B ...
Page 51: ...51 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H ANALOG Unit Side A ...
