Electrical Adjustments; Adjustment Procedure - Toshiba 20HL85 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.
• Before removing the anode cap, discharge electricity
because it contains high voltage.
• 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
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 MENU button on the remote control to end
the adjustments.
5. To display the adjustment screen for TV, AV, CS, HD-
MI 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
FILL
Step No.
340
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
22 V POSI
2. BASIC ADJUSTMENTS
2-1: WHITE BALANCE
1. Place the set in Aging Test for more than 15 minutes.
Receive the gray scale pattern from the Pattern
2.
Generator.
3. Using the remote control, set the brightness and contrast
to normal position.
4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "R DRIVE(N)".
5. Press the CH. UP/DOWN button on the remote control to
select the "R CUT OFF(N)", "G DRIVE(N)", "G CUT
OFF(N)", "R DRIVE(C)", "R CUT OFF(C)", "G DRIVE(C)",
"G CUT OFF(C)", "R DRIVE(W)", "R CUT OFF(W)", "G
DRIVE(W)" or "G CUT OFF(W)".
6. Adjust the VOL. UP/DOWN button on the remote control
to whiten the R CUT OFF(N), G DRIVE(N), G CUT
OFF(N), R DRIVE(C), R CUT OFF(C)", G DRIVE(C), G
CUT OFF(C), R DRIVE(W), R CUT OFF(W) G DRIVE(W)
and G CUT OFF(W), B DRIVE(W) and B CUT OFF(W) at
each step tone sections equally.
7. Perform the above adjustments 5 and 6 until the white
achieved.
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 CENTER
31 SHARP MAX
32 SHARP MIN
33 CONTRAST CENTER(N)
34 CONTRAST MAX(N)
35 CONTRAST MIN(N)
36 COLOR CENT
37 COLOR MAX
38 COLOR MIN
39 CONTRAST CENTER(C)
40 CONTRAST MAX(C)
41 CONTRAST MIN(C)
42 CONTRAST CENTER(W)
43 CONTRAST MAX(W)
44 CONTRAST MIN(W)
Fig. 1-2