Electrical Adjustments; Adjustment Procedure - Sharp LC-26SH12U - 26" LCD HDTV 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 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. Patterm 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.
Function
01 H POSI OSD 175
3. Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
4. Press the INPUT button on the remote control to end the
adjustments.
5. To display the adjustment screen for TV, VIDEO1,
VIDEO2, ColorStream HD, HDMI-0 and PC mode, press
the INPUT button on the remote control. Press the
VOL.DOWN button on the set and the channel (9) on the
remote control for more than 2 seconds.

ELECTRICAL ADJUSTMENTS

TV
SIDE BAR
480I
Step No.
Fig. 1-1
NO. FUNCTION
01 H POSI OSD
02 V POSI OSD
03 R DRIVE(N)
04 R CUT OFF(N)
05 G DRIVE(N)
06 G CUT OFF(N)
07 B DRIVE(N)
08 B CUT OFF(N)
09 R DRIVE(C)
10 R CUT OFF(C)
11 G DRIVE(C)
12 G CUT OFF(C)
13 B DRIVE(C)
14 B CUT OFF(C)
15 R DRIVE(W)
16 R CUT OFF(W)
17 G DRIVE(W)
18 G CUT OFF(W)
19 B DRIVE(W)
20 B CUT OFF(W)
21 H POSI 60Hz
22 V POSI 60Hz
2. BASIC ADJUSTMENTS
2-1: CONTRAST MAX
1. Receive the monoscope pattern. (RF Input)
2. Using the remote control, set the brightness and
contrast to normal position.
3. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (34) on the remote control to
select "CONTRAST MAX".
4. Press the LEFT/RIGHT button on the remote control
until the contrast step No. becomes "150"
5. Check if the picture is normal.
6. Receive the monoscope pattern. (VIDEO Input)
7. Press the INPUT button on the remote control to set to
the AV mode.
8. Using the remote control, set the brightness and
contrast to normal position.
9. Activate the adjustment mode display of Fig. 2-1 and
press the channel button (34) on the remote control to
select "CONTRAST MAX".
10. Press the LEFT/RIGHT button on the remote control
until the contrast step No. becomes "150".
11. Check if the picture is normal.
12. Playback the DVD(480i) disc. (COMPONENT Input)
13. Press the INPUT button on the remote control to set to
the COLOR STREAM HD mode.
14. Using the remote control, set the brightness and
contrast to normal position.
15. Activate the adjustment mode display of Fig. 2-1 and
press the channel button (34) on the remote control to
select "CONTRAST MAX".
16. Press the LEFT/RIGHT button on the remote control
until the contrast step No. becomes "154".
17. Playback the DVD(480i) disc. (HDMI Input)
18. Press the INPUT button on the remote control to set to
the HDMI mode.
19. Using the remote control, set the brightness and
contrast to normal position.
20. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (34) on the remote control to
select "CONTRAST MAX".
21. Press the LEFT/RIGHT button on the remote control
until the contrast step No. becomes "139".
22. Check if the picture is normal.
D-1
NO. FUNCTION
23 BAK LIGHT CENT
24 BAK LIGHT MAX
25 BAK LIGHT MIN
26 BRIGHT CENT
27 BRIGHT MAX
28 BRIGHT MIN
29 TINT
30 SHARP CENT
31 SHARP MAX
32 SHARP MIN
33 CONTRAST CENT
34 CONTRAST MAX
35 CONTRAST MIN
36 COLOR CENT
37 COLOR MAX
38 COLOR MIN
39 CONTRAST 40
Fig. 1-2