Sharp LC-20B4E (serv.man15) Service Manual ▷ View online
13
LC-20B4E
4. Initialization
When the microprocessor (IC2001) or the EEPROM (IC2008, IC2010) has been replaced or when the EEPROM
has been initialized, readjust the each adjustments.
4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
4-2. Select the model name to (A522).
4-3. Select the inch size (20).
4-4. LED changes green from red after setting finish and about 15 seconds, initialization is completed, and it
has been initialized, readjust the each adjustments.
4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
4-2. Select the model name to (A522).
4-3. Select the inch size (20).
4-4. LED changes green from red after setting finish and about 15 seconds, initialization is completed, and it
becomes adjustment mode.
4-5. Writing the model-by-model data
For the Ver.1.10A microprocessor, get it initialized first and then make the settings, listed below, on it. (The
microprocessor version is indicated at the bottom of Adjustment Process Page 1.)
microprocessor version is indicated at the bottom of Adjustment Process Page 1.)
4-6. Precautions in replacing the EEPROMs (IC2008 and IC2010)
When the EEPROMs (IC2008 and IC2010) have been replaced, be sure to replace also the microprocessor
(IC2001) with the one "Part No. RH-iXA522WJN1Q".
The version of the RH-iXA522WJN1Q microprocessor is 1.20A.
(IC2001) with the one "Part No. RH-iXA522WJN1Q".
The version of the RH-iXA522WJN1Q microprocessor is 1.20A.
Ver.1.10A data reprogramming (INCH SIZE [20])
Adjustment process page
8
13
18
22
26
30
34
41
41
41
41
41
41
41
41
41
41
41
41
41
41
Item
PAL BRIGHTNESS
SECAM BRIGHTNESS
N358 BRIGHTNESS
N443 BRIGHTNESS
PAL-M BRIGHTNESS
PAL-N BRIGHTNESS
PAL60 BRIGHTNESS
DPS NLC A6
DPS NLC A8
DPS NLC AA
DPS NLC AC
DPS NLC AE
DPS NLC B0
DPS NLC B2
DPS NLC B6
DPS NLC BA
DPS NLC BC
DPS NLC BE
DPS NLC C6
DPS NLC CA
DPS NLC D0
OSD settings
0
→
+5
0
→
+5
0
→
+5
0
→
+5
0
→
+5
0
→
+5
0
→
+5
0E
→
0B
0E
→
0A
18
→
1A
38
→
2A
3C
→
30
53
→
3B
4E
→
42
07
→
10
15
→
23
39
→
32
40
→
35
07
→
10
15
→
1B
50
→
55
14
LC-20B4E
5. Adjustment
5-1. +B adjustment...Page 1 +B-ADJ
Adjust the voltage of the pin (4) of P1902 to 5.00 ±0.02V with R3714.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.
5-2. Counter-bias adjustment
Vary the "COM BIAS" setting on Page 2 of the adjustment process mode so that the contrast be sharpest
(black looks most sinking).
(black looks most sinking).
5-3. TAMP adjustment
1) Receive the upper left of 75% white half colour bar signal.
2) See if the “Y” reading on page 2 of the adjustment process mode is somewhere following. If not, make the
2) See if the “Y” reading on page 2 of the adjustment process mode is somewhere following. If not, make the
“PAL TAMP” adjustment to get the “Y” reading in the range of AE thru BD.
3) If the adjustment of “PAL TAMP” is executed, write its adjustment value to the “SECAM TAMP” manually.
(Screen of the page 2 of the adjustment processing menu OSD)
5-4. White balance adjustment
Adjust “RCUTOFF” and “BCUTOFF” on the page 2 of the adjustment processing so as to obtain the colour
of the same level as the standard set.
of the same level as the standard set.
0
1
2
3
4
5
6
7
8
9
10
11 12 13
14 15 16
17 18 19
20 21 22
23 24 25 26
2
C
O
M
B
I
A
S
9
0
P
A
L
T
A
M
P
2
1
S
E
C
A
M
T
A
M
P
2
1
G
C
U
T
O
F
F
R
C
U
T
O
F
F
0
0
B
C
U
T
O
F
F
R
G
A
I
A
I
N
0
0
G
G
N
N
0
B
G
A
I
H
Y
T
A
M
P
T
A
M
P
L
0
B
B
A
6
D
E
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Y Data
(White 75%)
15
LC-20B4E
6. Factory Setting
6-1. Perform a factory setting after completing all adjustments.
6-2. A “POWER” keys is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.
6-3. “K” of the inspection process mode is displayed on the screen upper left.
6-4. CH (
6-2. A “POWER” keys is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.
6-3. “K” of the inspection process mode is displayed on the screen upper left.
6-4. CH (
ù
) and VOL (+) keys are pushed about 2 seconds at the same time.
6-5. Release keys, if “E” is displayed on the screen upper left and “COMPLETE” is displayed on the bottom of it.
6-6. After a while, a power will be in a standby mode and a setup will be finished.
Note: “First installation” serves on “Deutsch”.
6-6. After a while, a power will be in a standby mode and a setup will be finished.
Note: “First installation” serves on “Deutsch”.
7. Lamp error detection
7-1. Functional description
This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety
when the lamp or lamp circuit is abnormal.
If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed,
the followings occur.
when the lamp or lamp circuit is abnormal.
If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed,
the followings occur.
1
The main unit of television is turned OFF 5 seconds after it is turned ON. (The power LED on the front side
of TV turns from green to red.)
of TV turns from green to red.)
2
If the situation
1
happens 5 times sequentially, television can not be turned ON. (The power LED remains
red.)
7-2. Countermeasures
7-2-1. Check when turning OFF the lamp error detection
7-2-1. Check when turning OFF the lamp error detection
When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment
process with the power LED red. Entering the adjustment process turns OFF the error detection and turns
ON TV.
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" on line 3, page 1 of the adjustment process is 1 or more. If it is 1 or
more, it indicates the lamp error detection was executed.
process with the power LED red. Entering the adjustment process turns OFF the error detection and turns
ON TV.
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" on line 3, page 1 of the adjustment process is 1 or more. If it is 1 or
more, it indicates the lamp error detection was executed.
7-2-2. Resetting of the lamp error count
After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO
RESET" on line 3, page 1 of the adjustment process and set the number to 0 using the volume button.
RESET" on line 3, page 1 of the adjustment process and set the number to 0 using the volume button.
1
M O D E L
A522
V E R
R O M 1 . 1 0 A
Reset 0
Afterwards, perform the operation check to confirm that the lamp error detection does not function.
Page 1 of the adjustment process
INCH
SIZE
20
ERROR
NO RESET
5
PUBLIC
MODE OFF
EXT
CONTROL
OFF
EXT
MODE
UART
UPDATE
MODE
NORMAL
TEXT
RESET
OFF
16
LC-20B4E
TROUBLE SHOOTING TABLE
No picture and No sound
Check all the settings microprocessor's adjust process menu.
Do F3301 and F3302
function?
Are T3701's secondary
outputs, +34V, +9V, +5V
and -11V normal?
Remove F3301 and F3302
and check the load side.
Is there short-circuiting?
Is there short-circuiting of
T3701 primary side periphery,
Q3703, Q3704 and S4701.
Replace F3301 and F3302.
Check S4701 and
connection cable.
Is T3701's primary oscillator
waveform normal?
Check T3701's secondary
load.
Yes
Yes
No
No
No
No
No
Yes
Check J3701 periphery and
connection cable.
Replace F6700~F6704.
Is the pin (120) of IC1201 in
the "H" state?
Is the output of Q3606 in the
"L
" state?
Yes
Yes
No
No
No
Yes
Yes
Check the OFL1 line, IC1201
and their peripheral parts.
Check the OFL line, Q3606
and their peripheral parts.
Check T6700~T6709,
Q6700~Q6714 and
connection cable.
Back light lamp failure to light up
Is the primary side of
T6700 ~T6709 periphery
short-circuiting?
Replace the back light lamp
with new one and check
again.
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