Alignments
EN 26
LGE PDP 2K6
8.
8.
Alignments
Index of this chapter:
8.1 General
8.2 Alignments
8.2.1 Tools
8.2.2 Connection Diagram and Set-Up
8.2.4 Y-SUS Alignment
8.1
General
Notes:
•
Important
: if the PSU board, the Y-SUS board or the Z-
SUS board is replaced, the technician should check if the
voltages delivered by these boards are correct. If not, the
boards should be realigned in order to avoid bad
performance of the PDP.
•
Allow the set to warm up according conditions below for at
least 10 minutes before adjusting.
–
Service signal: 100% Full White.
–
Service DC voltage: Vcc= 5 V, Va= 60 V, Vs= 180 V.
–
DC/DC Pack voltage: Vsc= 120 V, Vzb = 100 V, -Vy= -
200 V
–
Preliminaries environment: Temp (25 ± 5 deg. C),
Relative Humidity (65 ± 10%).
•
Module adjustment should follow below sequence.
1.
First, set up the Vsc / -Vy voltage (Vsc= 120 V, -Vy= -
200 V).
2.
Then, adjust the voltage waveform (refer to
adjustment).
Caution:
Do not leave a still image for more than 10 minutes
(especially The Digital pattern or Cross Hatch Pattern which
has clear gradation) on the display, because this will cause
burn-in effects.
8.2
Alignments
8.2.1
Tools
•
Digital oscilloscope: > 200 MHz.
•
DVM (Digital Multimeter): Fluke 187 or similar.
•
Signal generator: VG-828 or similar.
•
DC power supply or PSU:
–
1 DC power supply for Vs: 0 - 200 V, > 10 A.
–
1 DC power supply for Va: 0 - 100 V, > 5 A.
–
1 DC power supply for 5V: 0 - 10 V, > 10 A.
–
A set of wires and appropriate connectors to hook up
the power supplies to the display.
–
Required voltage stability of the power supplies: within
± 1% for Vs and Va, within ± 3% for 5V.
8.2.2
Connection Diagram and Set-Up
1.
For the connection diagram of the measuring instrument,
refer to Fig. "Measuring equipment connection diagram".
2.
Set-up the initial voltage Vcc= 5 V, Va= 60 V, Vs= 180 V.
Note that the initial set-up voltage can be changed
according to the module’s characteristics (= the values on
the voltage label).
3.
Environmental conditions: temperature 25 ± 5 °C, relative
humidity 65 ± 10 %.
Figure 8-1 Measuring equipment connection diagram
8.2.3
PSU Alignment
Figure 8-2 PSU Alignment
Vs Voltage Adjustment
1.
Measure the Vs voltage (180...195 VDC) on pin 10 of
CN806 on the PSU board (see Figure
“
PSU Alignment
”
).
The voltage should have the same value as indicated on
the label on the PSU.
2.
If necessary, adjust Vs to its correct value with
potentiometer VR551 on the PSU board.
1
8
0V
1.
3
A
DC Power
Su
pply for V
s
65V
0.01A
DC Power
Su
pply for V
a
5V
1.2 A
DC Power
Su
pply for 5V
S
ign
a
l Gener
a
tor (VG-
8
25)
Power
Caution
(1) The power of the
s
ign
a
l gener
a
tor
s
ho
u
ld
b
e t
u
rned “ON”
b
efore t
u
rning “ON”
the power of the DC power
su
pply.
(2) The volt
a
ge of DC power
su
pplie
s
, in
s
t
a
nd
a
rd of Mod
u
le inp
u
t volt
a
ge,
s
ho
u
ld
b
e pre
s
et
as
follow
s
:
Vcc: 5V, V
a
: 60V, V
s
: 1
8
0V
(
3
) The power of power
su
pply m
us
t t
u
rned “ON”
b
y the following
s
e
qu
ence.
Rever
s
e direction when t
u
rning “off”.
*
Mod
u
le “ON” : 5V => V
a
=> V
s
, Mod
u
le “OFF”: V
s
=> V
a
=> 5V
(4)
S
ign
a
l gener
a
tor
s
ho
u
ld
b
e
s
elected with 1024 x 76
8
(XGA) mode.
Al
s
o the
us
e of the norm
a
l P
S
U (Power
Su
pply Unit) i
s
po
ss
i
b
le
Extern
a
l
Extern
a
l
Extern
a
l
G_16
3
90_02
3
.ep
s
170
8
06
+
-
+
-
+
-
Waveform te
s
tpoint
VR2
VR
3
G_16391_008.eps
020707
PSU (3501Q00203B)
Z001
F001
1M03
1M46
1M10
CN805
1M02
CN807
CN806
Vs adj
Va adj
VR551
VR351
G_16391_009.eps
020707
