1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
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.
Inferior silicon grease can damage IC's and transistors.
When replacing IC's and transistors, use only specified
silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
2. BASIC ADJUSTMENTS
D1-1
ELECTRICAL ADJUSTMENTS
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
2-1: CONSTANT VOLTAGE
1.
2.
3.
4.
5.
Place the set with Aging Test for more than 5 minutes.
Using the remote control, set the brightness and contrast
to normal position.
Connect the digital voltmeter to TP501.
Set condition is AV MODE without signal.
Adjust the VR501 until the digital voltmeter is 135
±
0.5V.
2-3: AGC VOLTAGE
1.
2.
3.
4.
5.
Place the set with Aging Test for more than 15 minutes.
Receive the UHF (63dB).
Connect the digital voltmeter to pin 5 of CP101.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "RF AGC".
Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 1.85
±
0.05V.
2-4: CUT OFF
1.
2.
3.
4.
5.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and contrast
to normal position.
Place the set with Aging Test for more than 15 minutes.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (00) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
1. Digital Voltmeter
2. Pattern Generator
Prepare the following measurement tools for electrical
adjustments.
On-Screen Display Adjustment
2-2: VCO
1.
2.
3.
4.
5.
6.
7.
Place the set with Aging Test for more than 10 minutes.
Using the remote control, set the brightness and
contrast to normal position.
Connect the oscillator (39.5MHz) to TP001.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "VCO COARSE".
Press the VOL. UP/DOWN button on the remote
control until the "OK" appear on the screen. If the "OK"
is not displayed, select the "+" side on the changed
from "+" to "-".
Press the PROG/PAGE UP button once to set to "VCO
FINE" mode.
Press the VOL. UP/DOWN button on the remote
control to select the 5 step down point from the upper
limit on the "OK".
(Example: In case of the "OK" point 30~41, select 36.)
Fig. 1-1
4.
5.
Use the PROG/PAGE UP/DOWN button or Channel
button (0-9) on the remote control to select the options
shown in Fig. 1-2.
Press the MENU button on the remote control to end
the adjustments.
NO.
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
FUNCTION
CUT OFF
RF AGC
AGC GAIN
R DRIVE
R CUT OFF
G DRIVE
G CUT OFF
B DRIVE
H POSI 50
V POSI 50
V POSI 60
V SIZE 50
V SIZE 60
VCO COARSE
VCO FINE
---
---
BRIGHT CENT
BRIGHT MAX
BRIGHT MIN
TINT
SHARP
CONTRAST CENT
CONTRAST MAX
CONTRAST MIN
NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FUNCTION
COLOR CENT
COLOR MAX
COLOR MIN
M R CUT OFF
M G CUT OFF
M B CUT OFF
CVBS OUT
APR THR
BELL
BANDPASS
H POSI OSD
V POSI OSD
H POSI TEXT
V POSI TEXT
H POSI 60
VS 4:3
HS 4:3
PC 4:3
CC 4:3
S CORR
E/W SHAPE
TRAPEZIUM
VS FULL
HS FULL
PC FULL
Fig. 1-2
NO.
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
FUNCTION
CC FULL
V POSI 50
V POSI 60
---
VS CINEMA
HS CINEMA
PC CINEMA
CC CINEMA
ZM CINEMA
---
---
VS 16:9
HS 16:9
PC 16:9
CC 16:9
ZM 16:9
---
---
VS 14:9
HS 14:9
PC 14:9
CC 14:9
ZM 14:9
Set to the STANDBY at the minimum of volume.
Press the channel button (9) on the remote control for
more than 3 seconds.
Press POWER button on the remote control to turn the
POWER ON within 2 seconds. The Fig. 1-1 screen will
appear.
1.
2.
3.
35 TV
VCO Status -
MMM
35 H POSI OSD
36 V POSI OSD
37 H POSI TEXT
38 V POSI TEXT
39 H POSI 60
00 CUT OFF
123
67
124
67
00