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1.
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
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 for a heat sink,
apply the silicon grease (YG6260M) on the contact
section of the heat sink. Befor 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. Oscilloscope
2. Digital Voltmeter
3. Pattern Generator
On-Screen Display Adjustment
1.
In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than
2 seconds to appear the adjustment mode on the
screen as shown in Fig. 1-1.
35 H. POSI OSD
2.
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
3.
Press the MENU button on the remote control to end
the adjustments.
NO.
FUNCTION
00
CUT OFF
01
RF AGC
02
AGC GAIN
03
R DRIVE
04
R CUT OFF
05
G DRIVE
06
G CUT OFF
07
B DRIVE
08
H POSI 50
09
V POSI 50
10
V POSI 60
11
V SIZE 50
12
V SIZE 60
13
VCO COASE
14
VCO FINE
15
-
16
-
17
BRIGHT CENT
18
BRIGHT MAX
19
BRIGHT MIN
ELECTRICAL ADJUSTMENTS
TV
128
Fig. 1-1
NO.
FUNCTION
20
TINT
21
SHARP
22
CONT CENT
23
CONT MAX
24
CONT MIN
25
COLOR CENT
26
COLOR MAX
27
COLOR MIN
28
M R CUT OFF
29
M G CUT OFF
30
M B CUT OFF
31
CVBS OUT
32
APR THR
33
BELL
34
BANDPASS
35
H POSI OSD
36
V POSI OSD
37
H POSI TXT
38
V POSI TXT
39
H POSI 60
Fig. 1-2
2. BASIC ADJUSTMENTS
2-1: AGC VOLTAGE
1.
Place the set with Aging Test for more than 15 minutes.
Receive the UHF (63 ± 1dB).
2.
3.
Connect the digital voltmeter between the TP002 and
the (GND) of TU001.
4.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "RF AGC".
5.
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.10 ± 0.05V.
2-2: CUT OFF
1.
Place the set with Aging Test for more than 15 minutes.
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 (00) on the remote control to
select "CUT OFF".
4.
Adjust the Screen Volume until a dim raster is obtained.
2-3: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1.
Place the set with Aging Test for more than 10 minutes.
2.
Receive the white 100% signal from the Pattern
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 (04) on the remote control to
select "R CUT OFF".
5.
Using the VOL. UP/DOWN button on the remote control,
adjust the R CUT OFF.
6.
Press the CH. UP/DOWN button on the remote control
to select the "R DRIVE", "G DRIVE", "G CUT OFF" or
"B DRIVE".
7.
Using the VOL. UP/DOWN button on the remote control,
adjust the R DRIVE, G DRIVE, G CUT OFF or B DRIVE.
8.
Perform the above adjustments 6 and 7 until the white
color is looked like a white.
2-4: FOCUS
1.
Receive the monoscope pattern.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
2-5: CONSTANT VOLTAGE
1.
Place the set with Aging Test for more than 15 minutes.
2.
Using the remote control, set the brightness and contrast
to normal position.
3.
Connect the digital voltmeter to TP501.
4.
Set condition is AV MODE without signal.
Adjust the VR501 until the digital voltmeter is 135 ± 0.5V.
5.
2-6: VERTICAL LINEARITY
1.
Receive the monoscope pattern.
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Adjust the VR420 until the SHIFT quantity of the OVER
SCAN on upside and downside becomes minimum.
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