Electrical Adjustments - Sharp LC-20SD5E 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
damage 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
01 H POSI OSD
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, EXT, PC
and DTV mode, press the
control. Press the VOL.DOWN button on the set and the
channel (9) on the remote control for more than 2
seconds.

ELECTRICAL ADJUSTMENTS

TUNER
4:3
25
Fig. 1-1
button on the remote
NO. FUNCTION
01 H POSI OSD
02 V POSI OSD
03 R DRIVE (M)
04 R CUTOFF (M)
05 G DRIVE (M)
06 G CUTOFF (M)
07 B DRIVE (M)
08 B CUTOFF (M)
09 R DRIVE (M)
10 R CUTOFF (H)
11 G DRIVE (H)
12 G CUTOFF (H)
13 B DRIVE (H)
14 B CUTOFF (H)
15 R DRIVE (L)
16 R CUTOFF (L)
17 G DRIVE (L)
18 G CUTOFF (L)
19 B DRIVE (L)
20 B CUTOFF (L)
21 H POSI
22 H POSI MAX
2. BASIC ADJUSTMENTS
2-1: FLICKER
1. Activate the adjustment mode display of Fig. 1-1 and
2. press the channel button (43) on the remote control to
select "DAC VCOM".
3. Check if the screen is flashing.
4. If screen is flashing, press the "
remote control and using the LEFT/RIGHT button on
the remote control to adjust the screen.
2-2: 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 button on the remote control to set to the
TUNER 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 CUTOFF (M)", "G DRIVE (M)",
"G CUTOFF (M)", "B DRIVE (M)", "B CUTOFF (M)",
"R DRIVE (H)", "R CUTOFF (H)", "G DRIVE (H)",
"G CUTOFF (H)", "B DRIVE (H)", "B CUTOFF (H)",
"R DRIVE (L)", "R CUTOFF (L)", "G DRIVE (L)",
"G CUTOFF (L)", "B DRIVE (L)" or "B CUTOFF (L)".
7. Adjust the RIGHT/LEFT button on the remote control to
whiten the R CUTOFF (M), G DRIVE (M),
G CUTOFF (M), B DRIVE (M), B CUTOFF (M),
R DRIVE (H), R CUTOFF (H), G DRIVE (H),
G CUTOFF (H), B DRIVE (H), B CUTOFF (H),
R DRIVE (L), R CUTOFF (L), G DRIVE (L),
G CUTOFF (L), B DRIVE (L) and B CUTOFF (L) at each
step tone sections equally.
8. Perform the above adjustments 6 and 7 until the white
color is looked like a white.
D-1
NO. FUNCTION
23 H POSI MIN
24 V POSI
25 V POSI MAX
26 V POSI MIN
27 BAKLIGHT CENTER
28 BAKLIGHT MAX
29 BAKLIGHT MIN
30 BRIGHT CENTER
31 BRIGHT MAX
32 BRIGHT MIN
33 TINT CENTER
34 CONTRAST CENTER
35 CONTRAST MAX
36 CONTRAST MIN
37 CONTRAST 50
38 COLOR CENTER
39 COLOR MAX
40 COLOR MIN
41 TEXT H POSI
42 TEXT V POSI
43 DAC VCOM
Fig. 1-2
" button on the