Electrical Adjustments; Adjustment Procedure; Basic Adjustments; White Balance - Sharp LC-20AD5E-BK Service Manual

1. ADJUSTMENT PROCEDURE

Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
• Use an isolation transformer when performing any
service on this chassis.
• When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
• When you exchange IC and Transistor with a heat sink,
apply silicon grease (YG6260M) on the contact section of
the heat sink. Before applying new silicon grease,
remove all the old silicon grease. (Old grease may cause
damages to the IC and Transistor).
Prepare the following measurement tools for electrical
adjustments.
1. Pattern Generator
On-Screen Display Adjustment
1. Set the VOLUME to minimum.
2. Press the VOL. DOWN button on the set and the
channel button (9) on the remote control for more than
2 seconds to display adjustment mode on the screen as
shown in Fig. 1-1.
PAL
Function
01 OSD H POSI 28
3. Use the UP/DOWN button or Channel button (0-9) on
the remote control to select the options shown in
Fig. 1-2.
4. Press the MENU button on the remote control to end the
adjustments.
5. To display the adjustment screen for TUNER, EXT1,
EXT2, EXT3, Component, HDMI1, HDMI2 and PC
mode, press the
Press the VOL.DOWN button on the set and the channel
(9) on the remote control for more than 2 seconds.

ELECTRICAL ADJUSTMENTS

TUNER
Full
Step No.
button on the remote control.
NO.
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22

2. BASIC ADJUSTMENTS

2-1: WHITE BALANCE

1. Place the set in Aging Test for more than 15 minutes.
2. Receive the gray scale pattern from the Pattern
Generator.
3. Press the
AV mode.
4. Using the remote control, set the brightness and contrast
to normal position.
5. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "R DRIVE(M)".
6. Press the UP/DOWN button on the remote control to
select the "R DRIVE(M)", "R CUT OFF(M)",
"G DRIVE(M)", "G CUT OFF(M)", "B DRIVE(M)", "B CUT
Fig. 1-1
OFF(M)", "R DRIVE(H)", "R CUT OFF(H)",
"G DRIVE(H)", "G CUT OFF(H)", "B DRIVE(H)", "B CUT
OFF(H)", "R DRIVE(L)", "R CUT OFF(L)", "G DRIVE(L)",
"G CUT OFF(L)", "B DRIVE(L)" or "B CUT OFF(L)".
7. Adjust the LEFT/RIGTH button on the remote control to
whiten the R DRIVE(M), R CUT OFF(M),
G DRIVE(M), G CUT OFF(M), B DRIVE(M),
B CUT OFF(M), R DRIVE(H), R CUT OFF(H),
G DRIVE(H), G CUT OFF(H), B DRIVE(H),
B CUT OFF(H), R DRIVE(L), R CUT OFF(L),
G DRIVE(L), G CUT OFF(L), B DRIVE(L) or
B CUT OFF(L) at each step tone sections equally.
8. Perform the above adjustments 6 and 7 until the white
achieved.
D-1
FUNCTION NO.
H POSI OSD 23
V POSI OSD 24
R DRIVE(M) 25
R CUT OFF(M) 26
G DRIVE(M) 27
G CUT OFF(M) 28
B DRIVE(M) 29
B CUT OFF(M) 30
R DRIVE(H) 31
R CUT OFF(H) 32
G DRIVE(H) 33
G CUT OFF(H) 34
B DRIVE(H) 35
B CUT OFF(H) 36
R DRIVE(L) 37
R CUT OFF(L) 38
G DRIVE(L) 39
G CUT OFF(L) 40
B DRIVE(L) 41
B CUT OFF(L) 42
H POSI
H POSI MAX
button on the remote control to set to the
FUNCTION
H POSI MIN
V POSI
V POSI MAX
V POSI MIN
BAKLIGHT CENT
BAKLIGHT MAX
BAKLIGHT MIN
BRIGHT CENTER
BRIGHT MAX
BRIGHT MIN
TINT CENTER
CONTRAST CENTER
CONTRAST MAX
CONTRAST MIN
CONTRAST 50
COLOR CENTER
COLOR MAX
COLOR MIN
TEXT H POSI
TEXT V POSI
Fig. 1-2